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Self-build communities: the rationale and experiences of group-build (Baugruppen) housing development in Germany

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Abstract

Group-build housing developments can bring together the cost and customisation benefits regularly attributed to self-build housing with a communitarian ethos associated with ‘intentional’ communities. This paper presents an initial examination of the rationale, motivations and social experiences of group-build housing from Germany, where over half of all new homes are produced independently from volume-build developers. The paper aims, firstly, to test the hypothesis that group-build delivers general ‘community’ benefits; secondly, to contribute to an understanding of the processes leading to successful schemes; and lastly, to demonstrate that by making individual home building dependent on the success of a larger group, collective interests can prevail over personal pursuit. This research draws attention to the motivations, the social experiences through the development process and the social legacy – aspects of particular interest for policy-makers as well as prospective builders – of group-build housing projects.
Cite as: Hamiduddin, I., & Gallent, N. (2015). Self-build communities: the rationale and
experiences of group-build (Baugruppen) housing development in Germany.Housing Studies,
(I-first).
Self-build communities: the rationale and experiences of group-build (Baugruppen)
housing development in Germany.
Iqbal Hamiduddin1 and Nick Gallent2
1Bartlett School of Planning (UCL), i.hamiduddin@ucl.ac.uk
2Bartlett School of Planning (UCL), n.gallent@ucl.ac.uk
Abstract
Group-build housing developments can bring together the cost and customisation benefits
regularly attributed to self-build housing with a communitarian ethos associated with intentional
communities. This paper presents an initial examination of the rationale, motivations and social
experiences of group-build housing from Germany, where over half of all new homes are
produced independently from volume-build developers. The paper aims, firstly, to test the
hypothesis that group-build delivers general ‘community’ benefits; secondly, to contribute to an
understanding of the processes leading to successful schemes; and lastly, to demonstrate that by
making individual home-building dependent on the success of a larger group, collective interests
can prevail over personal pursuit. This research draws attention to the motivations, the social
experiences through the development process, and the social legacy aspects of particular
interest for policy makers as well as prospective builders of group-build housing projects.
Keywords: Group-build, Housing, Community
1. Introduction
Although speculative volume building has become dominant in many housing markets
internationally, there are still countries in which individually-commissioned or self-built housing
remains the rule rather than the exception. Within Europe, the extremes of volume and self-
build delivery are commonly illustrated by the case of the UK on the one hand (where more than
80% of housing is developer-built in a market dominated by a small number of large volume
builders) and Germany on the other (where over 60% of housing is delivered to individual
households by small local builders) (Lloyd et al, 2015; Duncan and Rowe, 1993). Germany is not
unique. Austria and Switzerland, for example, display a similar housing market profile, showing
that the speculative development of housing by a few dominant companies is not an inevitable
outcome or signal or economic advancement. Germany’s housing market has a number of
features which have attracted international interest. First amongst these is the dominance of
individual custom or self-build housing production within a housing market that continues, for
reasons explored later, to be characterized by low rates of home ownership and high levels of
long-term market renting (Voigtländer, 2009; Golland, 1996). These features hint at the
peculiarity of the German market and act as a warning to those who would seek to transfer
simple lessons from Germany to other European countries. A second point of general interest
has been the conspicuous level of experimentation and innovation in ‘sustainable’ urbanism, and
particularly the emergence of an ‘intelligent trial and error’ (ITE) approach (Dotson, 2015)
linking novel means of housing production to innovative residential design. One particularly
striking aspect has been the physical scale of some ITE projects in Germany, including the 2,500-
home Vauban car-free suburb in Freiburg, Tübingen’s 2,700-home French Quarter and the
6,000-home HafenCity mixed-use quarter that is currently under construction in Hamburg.
Elsewhere, projects of this type that experiment with new forms of urbanism and housing
production have been far more modest in scale and include Edinburgh’s 120-home Slateford
Green car-free development, South London’s 88-home BedZed low-energy scheme and Bristol’s
48-home Ashley Vale community-build project (Hamiduddin, 2015).
Community-led developmentand particularly group-build - has been centrally important in the
roll-out of ITE schemes across Germany (Tummers, 2015; Dotson, 2015) with the aim being to
deliver places with particular social as well as physical qualities. Although the use of group-build
or Baugruppen development approaches has been described as a ‘revival’ of an older tradition of
Genossenschaften (Tummers et al, 2015: 72), it is distinctive in that it moves beyond simple co-
operative ownership of buildings. Group-build offers a broader response to three key dilemmas
in housing policy. Firstly, it responds to the issue of housing affordability, partly because of the cost
savings that derive from self-build compared with speculative production (Lloyd et al, 2015) and
partly because of the economies of scale that collective schemes deliver relative to individual self-
build projects (Hamiduddin and Daseking, 2014). Secondly, there is scope for the development
process to deliver higher levels of sustained social interaction, eventually leading to more cohesive
communities as evidenced by higher levels of communication and strengthened social ties
between residents (ibid.). And thirdly, group-build offers a distinctive approach to housing
development that is mirrored by the diversity and distinctive qualities of housing produced, with
homes more closely matched with the needs of occupant households.
Of these three key dilemmas in housing policyand potential benefits derived from group-build
- this paper focuses on the social outcomes of the group-build development process. Through
semi-structured interviews undertaken with members of two group-build housing schemes in the
German cities of Freiburg and Cologne (and development professionals in these cities) the paper
examines resident motivations for embarking on this particular approach to housing
development. More particularly, it considers whether interactions during the project
management and build processes are sustained and deliver a lasting social legacy.
1.1 Housing in Germany
Germany’s housing market has long been characterized by low levels of home ownership in
comparison with international standards. A home ownership rate of 43% contrasts with rates of
above 70% in Spain and the UK (Voigtländer, 2009). Moreover, this headline rate varies greatly
from place to place, reaching its lowest level of under 25% in the largest metropolitan areas
including Berlin and Hamburg and its highest, of above 50%, in more rural regions such as
Saarland and Baden-Württemberg (Westerheide, 2012). There are also higher rates of home
ownership amongst older households (in the 65 to 80 cohort) while younger households (headed
by someone under the age of 50) are increasingly less likely to be home owners (Westerheide,
2012). Voigtländer (2009) attributes these German patterns to five key factors: (1) the relative
size and quality of the rental and owner-occupied segments of the housing market; (2) the tax
treatment of owner-occupied homes; (3) mortgage lending criteria and the terms of mortgage
finance; (4) the relative cost of owned and rented units; and because of these factors (5) the
reduced investment appeal of German homes (Boehm and Schlottmann, 2014). The current
structure of the German housing market, and specifically the high proportion of private renting,
is a consequence of the post-war response to an acute housing shortage after 1945. Roughly
one-fifth of the nation’s housing stock was destroyed during the war and another fifth was
severely damaged. Federal housing laws enacted in 1950 and 1956 encouraged privately-
organized development for rent through the payment of state subsidies on schemes compliant
with minimum standards on space and fittings. The policy halved the housing shortage between
1950 and 1956 and led directly to the market structure observed today (Voigtländer, 2009;
Westerheide, 2012).
It was not until the emergence of mortgage products in the 1960s that private house-building for
owner-occupation began to exceed the output of new homes for the rental market. Yet even
today, a combination of lower loan-to-value (LTV) rates typically in the region of 60-65%,
relatively high long-term fixed interest rates and an un-dynamic property market that was
severely depressed for over a decade following the reunification of East and West Germany in
1991 - means that home ownership has remained a generally less attractive tenure than in
comparable industrialised nations (Bentzien et al, 2012).
1.2 Self-provided housing in Germany
In Germany today, more than 60% of new property built for private ownership comprises
individually-commissioned self- or custom-build development (i.e. self-provided housing)
delivered by smaller regional developers (Duncan and Rowe, 1993). However, new owner-
occupied development may be constrained by municipal controls on land supply for private
ownership, where municipalities are required to bear the costs of new infrastructure to service
new housing (Ball, 2005). At the margin of traditional private owner-occupied housing, housing
cooperatives are estimated to deliver 15 to 17% of housing across Germany (Tummers, 2015)
and it is into this sector that group-build or Baugruppen housing schemes have been placed.
Indeed, Tummers (2015: 72) argues that:
[…] the younger generations in Germany have revived the tradition of Genossenschaften
nowadays in Baugruppen, which implies a shift in the economic/cultural background of
residents involved […] and creates new overtures in urban development policies relying
on self-development.
As well as associating Baugruppen with the mutual cooperative model, Tummers (2015) also draws
a parallel with the intentional community ambition of co-housing and its emphasis on shared
facilities and communal living. Although such comparisons have some merit, with some
schemes tending towards co-housing for example in the practical provision of shared facilities or
prior motivations of residents, the Baugruppen model remains distinctive. A common house or
centre a critical social and physical focal point of co-housing (Sargisson, 2012) - can seldom be
found, and the schemes rarely adopt the model of mutual or cooperative ownership that
characterises Genossenschaften projects. Although a group may intend to live together as
neighbours, their goal is to do so as private owners of separate properties.
The self-provided sector embraces a number of different models, of which group self-build is
just one. Key cities - including Freiburg, Berlin, Tübingen and Hamburg - have become strongly
identified with experiments in group self-build. This is because these cities have experienced
sustained population growth, which has altered their demographic and generated intense pressure
at the entry-level of their housing markets. Droste (2015: 81) argues that
[…] self-organised and community-oriented housing has often gained importance in
times of social change and, like recently, economic crisis […]. The recent unexpected
increase in demand for lower-priced quality housing in growth areas across Germany has
forced municipalities, public and non-speculative housing providers to re-consider the
best use of new and existing stock.
In relation to Freiburg and Tübingen, Tummers (2015: 73) draws attention to the ways in which
group self-build has been promoted as a new orthodoxy in housing delivery:
Since the 1990s, these towns have adopted planning strategies for new housing areas that
are based on collective self-development by inhabitants. Both the substance of planning,
such as the size of plots in the Masterplan, and the process of planning, supporting the
formation and development of Baugruppen, have been transformed over the years to
embed the strategies in a structural way.
In Freiburg, the city administration provided serviced self-build plots for Baugruppen on sites
across the city (Hall, 2014), enabling over 1,100 homes to be delivered in the two decades
between 1993 and 2013 (Hamiduddin and Daseking, 2014). Public control of land (but not
necessarily direct ownership) has been a key enabling factor with, the municipality able to
exercise a high level of control over planning permission and the freezing of land prices through
powers similar to compulsory purchase orders (CPO) in the UK. Plots have been disposed of at
a fixed price, with infrastructure overheads internalised. At Vauban and Rieselfeld
(neighbourhoods in Freiburg), price freezing and disposal have been a crucial means of value-
capture, delivering significant funds for the extension of Freiburg’s tram network (which has
itself been crucial to the success of new residential quarters). The quality of development
proposals was given equal importance to price in the bidding process for plots. Design
competitions were used to select successful bids. Also at Vauban and Rieselfeld, a relaxation of
the city-wide design framework was intended give groups scope for personal expression and to
deliver variety through the ‘intelligent trial and error’ (ITE) approach which, in the case of the
Südstadt southern fringe urban extension in Tübingen, sought to produce greater porosity
between buildings and adjacent streets and public spaces.
In both of these cities, the delivery of more affordable housing has been a primary goal of
municipal support for group-build. These are small university cities in the attractive Black Forest
region of South West Germany. Many students remain in the cities after graduation, fueling
demand for housing. Although the communitarian aspect of group self-build does not seem to
have been a key policy motivation of either municipality, it is likely to be a contextual factor that
explains some of the popularity of this model in these particular locations. Groups in Vauban
actively lobbied against developer-led housing in the new quarter (Hamiduddin and Daseking,
2014), arguing instead for greater community involvement in shaping these new urban spaces.
Such involvement is often presented as, or assumed to be, the path towards a more inclusive
process. However, this community development aspect of group-build (i.e. development of the
community by the community) has been flagged up as problematic by some researchers.
Hamiduddin (2015), for example, has argued that empowering communities to play a more active
part in the development process may have an exclusionary effect as groups coalesce in a self-
selective way and de-select those who do not appear to fit the group-build mould; indeed, group-
build may favour the young and the affluent, and those about to start a family. Droste (2015: 81)
identifies group-builders as middle-class pro-active gentrifiers. In Freiburg, the sometimes
narrow socio-demographic mix resulting from group-build has become a cause of concern,
highlighting the problem of residential exclusion, which even community-based solutions can
promote.
2. Motivations for and benefits of group-build housing
Before moving to the central question of this paper whether a social legacy results from group-
build it is perhaps worth looking across the presumed motivations for, and benefits of, this
form of housing production. Brown et al (2013) have drawn attention to what they view as the
core considerations amongst self-builders: deriving benefits in terms of reduced cost and greater
potential for customisation, matched to personal needs and preferences. Drawing on the work
of Cerulli and Field (2011), they add to these two considerations the promise of creating ‘liveable
communities’, rooted in the social interactions that were crucial to the success of this form of
group-based, non-speculative, production.
2.1 Financial Considerations (Cost)
Affordability looms large in home-procurement decision-making and there is substantial evidence
to suggest that the cost of self-build compares favourably with developer-built housing (NaSBA,
2011 and 2012). Wallace et al (2013) cite a recent survey among British self-builders, noting that
half believed that self-build offers significant financial benefits. Cost-savings (and the possibility
of spreading costs over a longer period) create the opportunity to develop higher-spec homes
with the same or a smaller budget. In a study of six self-build projects in southern England,
Brown (2007: 273) observed that
[…] the value of self-building was less about immediate financial return, and far more
about the ability to acquire property of greater value as a consequence of the self-build
process (that can take place over a long period of time drawing upon income rather than
savings […] and through the contribution of labour in exchange for a lower purchase
price).
In Brown’s study, self-build was the only affordable means of housing access for some families in
an expensive region, while Barlow et al (2001) adds that, historically, self-build in the UK has also
been used as a last resort option for those unable to enter the housing market by other routes.
Because of economies of scale in the build process, group-build (as opposed to individual self-
build) seems to accentuate the affordability benefit, with households typically saving upwards of
20% over individual self-build housing (Hamiduddin and Daseking, 2014).
2.2 Identity and Place (Customisation)
A second potential motivation for group-build is to garner a sense of collective identity and
belonging. Clapham (2005) argues that when people aspire to have a home of their own, they are
seeking more than a roof over their head. A home provides a great deal more than a physical
space but rather provides[…] one of the greatest powers of integration for the thoughts,
memories and dreams of mankind’ (Bachelard, 1994: 6). It is a social space for both private and
collective dwelling (King, 2004) and the basis for belonging to a particular place (Savage et al,
2005) and community. Bachelard (1994: 4) asserts that ‘[…] our house is our corner of the world
[…] a real cosmos in every sense of the word’. The same ‘anthropocosmic’ sentiment emerges
from Heidegger's (1971) conception of ‘dwelling’ in which the domestication of space is viewed
as the ‘essence of being’ (p. 148). Brown (2007: 264) explicitly connects Heidegger’s notion of
dwelling to self-build housing, arguing that it representsas process and product - a […]
continuity of lived experience on the one hand […] and a representation of the social world on
the other’. It is an act of domestication that places the eventual occupant of a home centre-stage,
generating identity and attachment. Spaces are created that are closely aligned to individuals’
needs, aspirations and ideals. Moreover, self-build is a reflexive process through which
individuals better understand the needs and constraints of their physical environment (Brown,
2007; Marcus, 2006). Group-build projects extend this ‘person-place’ relationship (Marcus, 2006)
and, because of the inter-dependencies that play a crucial part in this particular act of
domestication, produce a broader social outcome, creating home from a collection of houses
(Lawrence, 1987).
2.3 Social Development (Communitarianism)
There is clearly a strong link between the act of production and the communitarian spirit that can
be claimed as an outcome of group-build. Homes collectively create the setting for the
interactions through which communities are constituted. But as well as needing the product,
communities also benefit greatly from being part of the process (labeled the ‘act of
domestication’ above). Collaborative development approaches can be viewed not only as an
alternative production model, driven by individual goals such as achieving cost savings, the
satisfaction derived from applying (or acquiring) practical skills (i.e. the ‘DIY’ factor) or the desire
for a bespoke home tailored to individual needs (Brown, 2007), but also as a communitarian
project that brings communities together in the development process and, in doing so, helps
foster social cohesion. Arguably, attempts to seed and direct community action (support for
group-build being a prime example) signals a communitarian worldview, which emphasises the
importance of community and the value of particular ‘social goods’ that arise from the
interactions that constitute community life:
The starting point for communitarian theory is the basic tenet that the existence of
strong community life - expressed as a state of affairs in which individuals belong to and
participate in a wider group (or groups) of common interests and shared goals - is of
inherent value in human society (Sage, 2012: 267)
It is through community life that collective actions are born and these actions are, in turn, central
to the ongoing production of community: people coalesce around a common purpose,
experience a strengthening of inter-personal bonds, pool resources, and develop a capacity to
deliver an array of social goods. The fundamental social good here is the transformation of
individual human capital into a collective social capital (see Chaskin et al, 2001 or Falk and
Kilpatrick, 2000), or through strong relationships, the capacity to deliver against collective needs
or the needs of vulnerable individuals. This thinking is rooted in ideas of community. Although
it has been suggested that socio-spatial communities are often inert, lacking common purpose
and any reason to interact (Bell and Newby, 1976), context and in this case the goal of
resolving shared housing needs - may create that purpose.
The success of group-build projects is dependent on the kinds of ‘reciprocities (Weber, 1956)
that underpin a sense of community. These projects can therefore be viewed as one of the many
contextual opportunities that, when grasped, will advance community development. But it can
also be seen as an especially significant opportunity, generating shared-purpose during its project-
phase (as individuals come together around a group action) and then providing a community
with a physical basis for its continued development into the future. Housing production
processes, and housing (or homes) as an outcome, are important social goods. Following this
line of argument, group-build provides a route to greater social cohesion and a sense of place that
may be weakened where there is greater distance between housing production and consumption,
and where influence over the ‘domestication of space’ is limited (at best) to indirect influence
over incremental planning decisions. A sense of control, and being able to directly shape
outcomes, seems to deliver a clearer sense of belonging (Parvin et al, 2011).
However, the link between group-build and community building is perhaps a little too
convenient. Theories of ‘social capital’ (or the resource potential of relationships between
individuals with their separate human capital) - which have gained traction in recent years - point
to the limitations of community life as a source of social goods. Putnam (2000), drawing a
distinction between close ties shared by neighbours (delivering bonding social capital) and links
to others outside a socio-spatial community (bridging social capital), suggests that groups often
lack the skills and resources needed to take on complex projects or deliver really big, important
social goods. For group-build, this might mean that some places lack the requisite resources; or
it might mean that groups need to look outside themselves for the skills needed to advance
projects. The idea that communities have a ‘store’ of social capital (that may be inadequate)
provides a means of understanding the close or extended reciprocities and relationships that may
need to develop for projects to get off the ground: they are not an automatic or natural outcome
of community life. Rather, something instrumental may need to happen for particular things to
be achieved. This leads on to the concept of ‘intentional communities’ (Sargisson, 2012), which
form and consciously self-select with a ‘specific purpose in mind’, drawing in the skills they need
to deliver against a set agenda. They are carved from a larger society (ibid, 6) and comprise
individuals who wish to live in different ways. Drawing on a study of co-housing schemes in the
US, Sargisson (2012: 50) concluded that co-housing participants had ‘chosen to live in a
community and share goals’, prefixing those communities as ‘intentional’. The communitarian
ideal, progressed through the resource potential of human relationships, but with a self-selecting
and intentional community quality, seems to be a good descriptor of the social driver of group-
build.
2.4 Moving Forward
But to what extent does this descriptor hold true; can group-build housing serve as a pathway for
enhanced and sustained social relations? This question frames our analysis of group-build
housing from this point onwards. Collaborative group-build projects can be examined through
the lens of social capital, being characterised by two broad approaches: one which is independent
and internalised within a community (reliant on bonding capital), and another which is
externalised and supported by introduced expertise (that is, bridged). The suggestion is not that a
deficit of social capital exists within existing, industrially-produced housing areas, but rather that
collaborative-production delivers an additional opportunity for building social relations through
the development process. This rationale is perhaps the least developed of the three drivers of
group-build précised above. Analysis from two case studies, described below, was structured
around three themes: (1) the motivations and rationales underpinning group build; (2) the
experience (social and technical) of the build process; and (3) the lasting social legacy. The
following critical questions are asked:
a) Beyond the initial triggers for group-build, how do social networks act as an incubator for
these schemes, and what social processes carry them forward?
b) How are schemes taken forward into the build-phase, and how important are social
processes in determining outcomes?
c) What is the lasting social legacy of group-build; is there evidence of enhanced community
development over conventional developer-produced housing?
d) Can group-build schemes be considered intentional communities?
3. Research Approach and Findings
This is the first investigation into the social experiences and potential learning points offered by
the German group-build development approach within the academic literature. Material has
been gathered from two case-study sites. The first was Vauban in Freiburg, where one-to-one
semi-structured interviews were conducted with a range of different actors involved in the group-
build development process including; Freiburg’s former director of planning who was
instrumental in setting the context for plot-based group-build, two architects who were involved
in designing, organising and project-managing more than twenty of Vauban’s group-build
schemes (and over 200 in total across Freiburg and elsewhere in Germany), and a resident
member of a 6-home Baugruppen scheme, as shown in Figure 1. The second site was the 16-home
Sülzer Freunde project in the south-west of Cologne. Data collection in that case took the form of
a single focus group with five residents. Short profiles of each scheme are provided below.
A pro-forma of common questions provided the basis for all of the 30- to 120-minute interviews,
each of which was recorded and later transcribed. A thematic analysis was then undertaken in
order to address the four critical research questions.
3.1 Vauban, Freiburg
More than 1,100 homes have been completed across the southern German city of Freiburg, of
which 500 homes are located on the Vauban suburb. Named after a Napoleonic general, the site
was formerly a French military barracks until the withdrawal of troops after German
reunification. Control of the barracks then reverted back to the German state. Thereafter, the
City of Freiburg acquired the site for a nominal fee and, after the development of a master-plan,
set about disposing of plots through a competitive bidding process. A full overview of that
process is provided by Hamiduddin and Daseking (2014).
[Insert Figure 1]
3.2 Sülzer Freunde, Cologne
Located in Cologne’s Sülz district, this is a small scheme compared with the Vauban
development. It is, however, a typical way of facilitating group-build on small urban infill sites.
Similar schemes exist in Bremen and Hannover. Thirty five homes have been built by four
separate groups on a third of a 6ha former orphanage site; each of the groups entered into a
competitive bidding process in order to acquire their plots. Further details can be found at
NaSBA (2014).
[Insert Figure 2]
4. The Social Experiences of Group Build
4.1 Triggers and the incubating effect of social networks
According to Freiburg’s former Director of Planning, group-builders come together in one of
two ways. Sometimes a pre-existing group of friends simply decides that the group-build route
will deliver a desired and preferred housing outcome. The formation process might be described
as ‘organic’; it is certainly not facilitated by any external influence. The project that ensues is
‘incubated’ within existing social and friendship networks and it is the desire to maintain and
strengthen that network which provides the primary ‘social’ driver for group-build, though the
prospect of reduced housing costs is also crucially important. The Sülzer Freunde group claimed
this social driver was key and provided ‘70%’ of the rationale. It grew from a previous
experience of living in close proximity and was seen as a means of maintaining a sense of
community:
We've had a kind of a community in our last apartment [block] as well and our best
friends live there and they are in this group now as well, so when they came up with the
project, it was absolutely clear that we were going to join it and apply for it (Female
resident, Sülzer Freunde).
Even where practical considerations were thought to outweigh social ones, the importance of
friendships in driving and incubating the process in its early stages was clear:
I think the main two motivations were the desperate living situation on the one side and
the discovery that, together with these friends we associated with, we have the same
vision (Male resident, Sülzer Freunde).
The second way in which groups come together is through professional leadership. Here, there
is no pre-existing group, but an individual with particular technical skills (e.g. an architect or
someone from the building sector) and the desire to self-build (and usually with a specific site in
mind) advertises for others to join a group-build project. As one might suspect, the social motive
is weaker or non-existent and the primary driver under this ‘professional’ model is reduced cost
or the scope for customisation; building a home more suited to one’s needs.
Yet the dividing line between these approaches can often be blurred as a result of particular
group dynamics. It is not the case that all groups remain inward looking or that groups, once
assembled, do not begin to believe in the primacy of the social motive. Even in the organic
groups, a key individual may act as a bridge to professional networks and thereby introduce
extra-local resources and skills that may come to dominate the group and alter the relationships
between founding members. Groups may, therefore, become de facto professionally-led.
Similarly, those projects not incubated within an existing social network but led by a professional
founder may take on some of the social and organic characteristics of the former. There is a
degree of convergence between approaches as the projects progress and as stronger bonds form
between individuals: new leaders emerge or the original leaders and initiators may come to take
more of a back-seat. In the case of the Sülzer Freunde project, one prospective resident and an
architect by trade acted as the key node, initiating group formation, dealing with the city planners
and leading on the initial phase of the scheme. However, this individual subsequently handed
management responsibilities over to an external facilitator once the development process began
(Female resident, Sülzer Freunde). This resident facilitated the creation of the initial network and
others usually friends or relations of friends were attracted to the group-build approach and
joined because they were able to do so and bought into the initiator’s vision. The network
extended rapidly, drawing in relative strangers and also professional contacts able to see the
project to completion. Ultimately, this was not merely a group of friends, but an extended
network that bridged to additional skills as necessary, so as to deliver its vision.
The narrative at Vauban was rather different because a community organisation - the Forum
Vauban - was instrumental in drawing residents’ attention to the potential benefits of group-
build. It was within that framework that a group of residents - all attracted to the idea of
creating an environmentally sensitive scheme built to ‘passive house’ standards - came together,
without professional initiation but in the context of an organisation actively promoting the idea
and the benefits of group-build. At first, the social motive appeared absent. Members were
drawn by the reductions in individual build and living costs that a combination of group-build
and passive house construction offered. Yet ultimately, the sharing of resources and the support
of others became important factors driving forward the process:
[...] first of all, one heard that it was cheaper because you only had to pay for the crane to
come once; you only had to pay for the roofer to come once and do the whole roof in
one go and this sort of thing and, secondly, just simply to have moral and real support
from other people [was crucial] (Male resident, Vauban).
In both case study developments there was an implicit expectation that the experience of group-
build would lead participants to become good neighbours. It was believed that the groups would
continue to self-select through the various stages of the process, with only the sociable and like-
minded remaining at the end of that process (Freiburg-based architect). Moreover,
You learn a lot about yourself and about your prospective neighbours, your future
neighbours, during this whole planning period, which is much smoother, very beneficial
if you buy from an investor, you buy a flat and you don’t know the person who’s moving
in next door at all it could be someone that you absolutely despise after six months.
Within the self-building group, that’s very difficult, because these difficulties will raise
their heads much earlier (Male resident, Sülzer Freunde).
The opportunity for self-selection (and de-selection) was an important part of the social motive
for group-build. In both case studies, participants believed that greater community cohesion
would come from the collaborative nature of group-build from the outset. In reality, such
enduring cohesion was found to form between households with similar educational backgrounds,
similar values, and those occupying broadly the same socio-economic class. Wealth and income
play some part in determining who can participate (Freiburg-based architect) even though only a
modest capital outlay is required at the beginning of the process to cover start-up costs and
professional fees. Participants must, however, also be able to access mortgage finance to cover
total costs. Group-build was therefore found to attract a niche of residents whose financial
means were strong enough to make themdependablegroup members, but often who lacked the
adequate financial resources to complete an individual self-build build project.
It became clear through the interviews that immediate or extended social networks played a key
role in group-build schemes. Seen through a social capital lens, it was also apparent that
reciprocities and trust (sharing resources and having the confidence to share liabilities) are an
obvious outcome of group interaction. Broadly, the housing product emerges as a social good
from the life of the group, being incubated by its supporting social network. We can observe in
the social process, a coming together of like-minded people from similar socio-economic
backgrounds, and the exclusion of those predicted to be ‘bad neighbours’ or unable to pull their
financial weight through the delivery process (see next section). These aspects of the process
point to clear social outcomes, which are explored further in the next two sections.
4.2 The build phase and social processes
Land acquisition is often the first major practical task for a group. In Germany, it has become
usual practice for a municipal authority to sell public land to groups at a fixed price following
design-based competitive bidding. Because groups are required to provide proof of project
finances as part of their submission (Freiburg’s former Director of Planning), this competitive
approach is thought to improve design quality and ensure project delivery by filtering out
financially weaker group members or group submissions. Some members therefore fall away at
this stage. At Sülzer Freunde, one member left as they were unable to secure mortgage finance and
other left as the scale of the project commitment became clear (Male resident, Sülzer Freunde).
After this initial ‘reality check’, the broader social group consolidates into a viable group for the
project phase, sometimes with a clear leader emerging, depending on the complexity of the
project ahead and the availability of technical skills within the group. In the Vauban case, a
relatively small group of six households, and a comparatively straightforward task of constructing
six terraced houses within a single-building structure, meant that no single leader or project
manager was appointed from the group although the group member with the greatest experience
of the processes emerged as a team-leader of sorts. The group relied on internal skills and the
dedication of team members who contributed to the build process according to their experience.
An externally-appointed architect managed detailed technical aspects of development whilst
group members contributed in different ways, ‘[…] whether it was just keeping humour up at the
meetings or practically’ (Male resident, Vauban). However, the group’s initial ad hoc arrangement
became increasingly strained at weekly meetings during the build phase; and the absence of a
formal management structure created space for tensions to surface between some members the
product of personality rather than major differences in opinion although ultimately the energy
generated from inter-personal friction was harnessed to drive the project forward:
[…] my wife’s particular strength is her determination at pushing through and if there’s
something she didn’t like, she just pushed through and actually Gabriella (at the end
there) is the same kind of person and often they clashed, but on the other hand, due to
this determination, we got it done (Male resident, Vauban).
Larger and more complex projects generate their own social and organisational tensions, centred
on questions of leadership and power. Sometimes, an effective project manager was considered
essential to the success of a scheme (Freiburg-based Architect). Although an apparently suitable
candidate may emerge from the core group, it might not always be desirable to have an internal
member playing such a pivotal role without an external and objective ‘counterbalance’. For
some larger projects, resident-led steering groups are formed to oversee legal matters and the
construction phase (Freiburg-based Architect). At Sülzer Freunde, a significant challenge was to
match apartments to the needs of specific members whilst taking forward a coherent design-
scheme with common elements. A ‘construction commission’ was set up comprising a sub-
group of prospective residents. This was tasked to mediate between group members and the
architect and, ultimately, it oversaw the allocation of build costs between residents: with top-floor
apartments costing 10% more than middle apartments and ground-floor apartments costing 10%
less.
This ‘commission’ comprised five residents; two further, similarly-constituted, commissions were
established to handle legal issues and the planning of communal areas, covering the gardens and
shared facilities including a garage, workshop and guest apartment. The requirement for these
resident commissions was not envisaged at the beginning of the process but it quickly became
apparent that sixteen individual households each negotiating for something slightly or
significantly different[…] would have raised the architect’s cost almost infinitely’ (Male resident,
Sülzer Freunde). However, the need to resort to commissions and to delegate decisions created a
number of tensions that were difficult to reconcile with the ‘consensual’ way in which some
members expected the groups to operate. In some instances, majority views within the
commissions prevailed, leading to tensions between the victors and losers. At other times, there
was greater investment in reaching consensus and this was viewed as being very much in the
‘spirit’ of group-build:
I always thought of myself as being some kind of dictator and knew exactly what I
wanted and what I didn’t want […] I had an opinion in the beginning, a very definite
[…] but during the discussions, it was easy for me to see the other points of views, so I
could accept it easily (Female resident, lzer Freunde).
This collaborative process, achieved through the commissions, obliged individuals to expose
their sometimes entrenched positions to group scrutiny. Ultimately, it was impossible for
individual demands to prevail without threatening the viability of an overall scheme, either
because the building would no longer be buildable or because a disintegration of the group would
cause the entire project to stall. An important feature of group-build is that project success is
entirely dependent on being able to work through differences, hold the group together, and
ensure that individual aspirations align (to a significant extent) with those of the group. This can
be illustrated in very simple ways. For instance, floor plans need to vertically align so that
bathrooms and kitchens share common plumbing and windows are not haphazardly scattered
across the face of a building. Prospective residents have to reach very simple compromises in
order for a building to function. These simple compromises can be difficult to achieve. In the
case of Sülzer Freunde, broad compromises were achieved during 67 meetings over a three-year
period and, outside of these meetings, group members worked continuously with the architect to
achieve internal customisation that would not disrupt the overall design. Although the process
was punctuated with moments of anger and genuine doubt, the group needed to ‘keep an eye on
the whole thing’ and to work collectively towards the general outcome that everyone seemed to
want (Female resident, Sülzer Freunde).
As well as being vexed by these issues of building design, participants in the Sülzer Freunde project
encountered the unexpected problem of enclosed garden space. Because residents at the top of
the building were to benefit from roof terraces, it was felt by others that larger private gardens
should be allocated to ground-floor residents, thereby subtracting from the quantum of shared
outside space. A garden commission was established. This tried to balance the allocation of
private and communal space in different ways, but failed. As a last resort, the group turned to a
landscape architect, who was asked to find a design solution that delivered a mix of privacy and
shared access. Despite differences in opinion remaining, a compromise was found which
provided a final illustration of how group-build can only succeed when collective goals prevail
over personal preference. In both the smaller Vauban schemes and the larger schemes at Sülzer
Freunde it was only through dialogue, grounded in the direct interest of all participants, that
projects are realised.
4.3 The social legacy
Strong social relations are a feature of both the Freiburg and Cologne schemes. In the former
case, where most residents were strangers before the project started, this does not mean that
strong friendships now exist between all residents. However, the shared experience of group-
building was thought to have created new friendships and increased familiarity:
[…] you’ve been going to meetings once a week for the last two years, you’ve been
arguing with them, you’ve fought, you’ve stood your ground, you’ve compromised [...]
the neighbours [next door] are really our best friends, that’s really great, and we knew
them before, although we didn’t know them very well, but during this phase of building
we got to know them better of course and they’ve remained very good friends [...] The
others in the group, we’re not great friends, we don’t go in and out of each other’s
houses the whole time, we greet each other in the street [...] (Male resident, Vauban)
At Vauban, other research has suggested markedly stronger social relations compared with other
Freiburg neighbourhoods. Comparing Vauban with Rieselfeld (another new neighbourhood
where Baugruppen schemes account for around 10% of all homes) and Haslach (a ‘traditional’
neighbourhood with no group-build schemes) Hamiduddin and Daseking (2014) found that the
strength of social relations, measured in terms of familiarity / sociability, corresponded closely to
the mode of housing delivery (see Table 1). The evidence appears to support the contention that
group-build can have a transformative effect on sociability.
[Insert Table 2]
In Cologne, the build process has served to strengthen and enrich pre-existing social relations
despite the frictions that surfaced during the build phase. The extent and depth of mutual
support is striking; from practical assistance in spreading collateral across all households at the
outset to enabling financially weaker participants to raise a sufficient deposit for a mortgage, to
social support during decision-making. One group-builder claimed that without the support of
the group they would have been ‘totally lost’ in the bureaucratic complexity of the process whilst
another member of the same group drew attention to the trust between individuals that emerges
out of group-build. This is only tempered by the view that, across society at large, individual
goals are often prioritised above social ones. Yet in that same context, the act of group-building
provides important lessons in what can be achieved, for individuals as well as the wider group,
through social action.
The social legacy therefore appears to have two dimensions. The first is a heightened and
measurable level of familiarity in those places that have, at least in part, been delivered through
group-build activity. The second is a shared experience of self-help, and an awareness of how
collective problems are resolvable through the ‘power’ of social capital. The findings presented
here provide admittedly anecdotal evidence of a social outcome and patterns of familiarity are
only suggestive of a lasting legacy. Clearly, there is scope for further analysis of the links between
the mode of housing production in different places and social consequences.
4.4 Group Build as Intentional Community
Are group-builders intentional communities? The factors underpinning group-build cost,
customisation or community are discernable from the outset of a project and it is often the
case that the community factor may not be the primary driver. However, through the
collaborative process of group-build and through the processes of selection and de-selection,
closer social ties may form, leading ultimately to an outcome that roughly corresponds with
Sargisson’s (2012) notion of an ‘intentional community’. The Sülzer Freunde project displays many
of the hallmarks of an intentional community scheme, being formed from a group of mutual
friends who set out to deliberately live together, although additional residents were brought into
the project later on. By contrast, the Freiburg group was formed from a more ad hoc mix of
friends and strangers who collectively had little in common, other than a desire to build homes.
The Freiburg group was significantly less motivated by social objectives, and much more by
practical and financial considerations: to save money rather than achieve ‘social therapy’
(Freiburg-based Architect). These underpinning motivations influence the subsequent
development pathway. Less communitarian groups may be more inclined to opt for a greater
degree of professional project-management and building work, where limited options are given
by a managing architect in order to provide the simplest and quickest route to delivery.
Conversely, both cases suggest that a greater social emphasis in ‘organic’ groups can mean that
residents are more ‘hands-on’, with greater potential cost-savings (and also greater risk of cost
escalation) but with intensive engagement required. The ‘organic’ and ‘professionally-ledproject
pathways identified here are, however, generalisations. Both the Freiburg and Sülzer Freunde cases
may be considered to be ‘hybrid’ schemes, which nevertheless suggest the existence of these two
distinctive, if not discrete, approaches.
More generally, group-build communities across the case-study areas tend to display two
common characteristics, regardless of development pathway pursued. The first is that residents
tend to be well-educated and often engaged in professional, salaried, occupations. Although the
desire to save on housing costs provides an important motivating factor for self-build generally
(Brown, 2007), interviewees stressed repeatedly that group-build as practised in Germany -
would not be appropriate for less well-off households. This is because of the initial collateral
required alongside the necessary budgetary flexibility and the potential for project over-spend.
There needs to be ‘financial’ trust between participants; no ‘weak link’ in the chain.
The second characteristic is that households typically comprise younger couples (30 to 45 years
old) with dependents. As one interviewee noted:
[…] there are 31 adults and 28 children, so we have quite a lot of families with three
kids, two kids and maybe further kids coming in (Male resident, Sülzer Freunde).
A similar profile was observed across the six households of the Vauban case. More broadly,
Vauban has a higher average household size (at 2.95) than Freiburg as a whole (1.92) and a much
lower proportion of residents aged over 65 (2.1% compared with 16.9%). Although the group-
build approach may be attractive to a wide cross-section of society, in Freiburg the approach has
been most popular with former students who have stayed in the city after graduation and are
now raising young families.
5. Conclusions
Despite international interest in the peculiarities of the German housing market and the
propensity of certain cities to engage in innovative urbanism, group-build remains a niche
activity; albeit an activity that is gaining popularity and appears to be on an upward trajectory. It
connects with many different agendas: the need to deliver high-quality housing at an affordable
price; the desire to deliver interesting, liveable places that are structured around good public
services; alignment with individual needs and preferences; and also the goal shared by many
households to rebuild community through collective effort. The research on which this paper
drew set out to better understand the group-build development process by deconstructing
aspects of that process in two German case studies, aiming to examine in particular (a) social
processes in group formation, (b) how those processes evolve during the progression of a
scheme, (c) the social legacy, and (d) whether or not group-builders can be conceptualized as (or
eventually become) intentional communities.
Addressing the first issue (a), this paper has identified two main approaches to Baugruppen
formation, which align with different motivations. However, the limitations of this simple binary
framework have been acknowledged. ‘Organically’ formed groups may recruit additional
members through formal processes and evolve into more professionally-led bodies in order to
deliver their objectives. On the other hand, those groups that are brought together by built
environment professionals may later take on many of the qualities of self-selecting social groups.
During the evolution of projects (the paper’s second theme (b)), the ongoing processes of
selection and de-selection deliver two social outcomes: selective (or ‘exclusive’) community
building (as those not entirely wedded to the project, or who do not fit in, fall away) and
gentrification (as those unable ultimately to participate are lost; although many do not join in the
first place). Group-build projects can be intense social experiences, which confront individual
preferences with collective needs. Such confrontation can sometimes be dealt with through
dialogue; in larger and more complex projects it requires careful mediation. The confrontations
can result in a strengthening of the social group, but they can also result in a fragmentation and
loss of members. Arguably, this might lead to a whittling down of the group and the formation
of cliques, although evidence presented on broader patterns of familiarity (Hamiduddin and
Daseking, 2014) in areas where group-build has been significant suggests social outcomes that
extend beyond individual group-built developments. Indeed, in relation to the third theme (c),
there is general evidence of greater familiarity and sociability (knowing and greeting neighbours)
in residential quarters where group-build has been important. How this translates into higher
and sustained levels of social capital remains largely unknown although with one significant
project under their belts, it might be expected that local groups are better equipped to confront
new challenges: because they understand the potential that exists locally and recognise the likely
individual and social benefits of collective action. Lastly (d), although group-build housing
projects do not generally equate with the ‘intentional communities’ that co-housing schemes
aspire to, they can nevertheless deliver a number of comparable social outcomes. This is partly
because these projects appeal to younger households who may be more ready to embrace aspects
of communal living (Brinkley, 2013; Tummers, 2015). However, many of the physical signifiers
of intentional communities communal spaces and shared facilities such as common dining
rooms are usually absent from group-build schemes. That said, the environment generated by
group-build of familial trust built on common experience seems to be attractive to
households with young children or those who intend to start a family. In Germany, households
expect to purchase a house only once - or a small number of times - in a lifetime and home-
ownership tends to be linked to raising children (Voigtländer, 2009). In that broader cultural
context, group-build has particular appeal. The evidence from this study indicates that group-
build - with its potential social drivers and outcomes - is seen by many to represent a family-
friendly and sociable model of housing production, characterised by strengthened social bonds
and embodying one of the key ideals of an intentional community: the desire, at the outset or
eventually, to pool resources and enjoy the fruits of collective responsibility measured in terms of
increased social capital.
Are there broader lessons to be drawn from this study? Even in countries with a seemingly
entrenched reliance on volume production (including the UK; Wallace et al, 2013), demand for
self-build is exceeding the supply of opportunity. More supportive planning could play a part in
increasing this opportunity, promoting ‘group build’ as one of a raft of alternatives to volume
production. In the aftermath of the global financial crisis, the need for mixed-mode housing
production (and therefore a system of supply with greater flexibility and durability) was an
argument commonly presented by those who opposed ‘business as usual’. Although business as
usual seems now to be the direction of travel, it is clear that the benefits of self-build for
individual households can be extended by the group-build approach, with those benefits taking
on a social dimension whilst also reaching a greater number of participants. But a key lesson
from Germany returning to the first point is that a context must be provided in which the
power of speculative providers (especially over the land market) is curtained and group-build is
given a chance to flourish. Group-build in both of the case-study cities was promoted through
effective municipal control of land, involving the freezing of land prices and disposal through a
competitive bidding process. There was an effective mechanism for value-capture, which meant
that value was not lost to landed interests, but rather a part of that value could be retained for
infrastructure upgrading whilst another part was effectively passed to the group-builders, who
won the right development not only because of the price bid for their plot but also the quality of
their proposal. Control of land enabled a transformation in expectation; development proposals
judged not only against value for money criteria but also on the basis of good urbanism. If
similar group-build models can be formulated elsewhere and embedded with new approaches to
land value-capture then the potential benefits are manifold: from greater affordability through
enhanced liveability, within and outside the home, to a lasting community legacy. Put simply,
group-build can make a significant contribution to delivering better places. However, the
German experience also points to potential pitfalls: there is a real risk, through community self-
selection, of group-build becoming an exclusionary path to housing delivery. Although it is a
niche means of production with potential for expansion, it cannot deliver against the needs of all
households. Maximum benefit will be derived from this model if it is seen as one route to
delivering the homes that communities need amongst a jigsaw of alternatives.
Acknowledgement
This research was supported through a UCL Grand Challenges award. We are grateful for that
and also for the assistance provided by John Kelsey, Bartlett School of Construction and Project
Management, at earlier stages of the project, and to the reviewers for their comments on earlier
versions of the manuscript.
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... Recent decades have seen an upsurge of collaborative urban housing, driven by urbanisation, demographic and economic changes, diversification of lifestyles, and quest for communal, affordable, and sustainable living (Thörn et al., 2020;Lang et al., 2020;Tummers, 2016;Vestbro, 2010). The solutions range from participatory cohousing (McCamant & Durrett, 2011;Vestbro, 2000;Tummers, 2016;Falkenstjerne Beck, 2020;Hamiduddin & Gallent, 2016) to institutionally developed housing with shared facilities (e.g. Glass, 2012), and to commercial coliving brands offering living as a service (Bergan et al., 2021;Casier, 2024;Ronald et al., 2024). ...
... 'Collaborative housing' is also used as an umbrella term Lang et al., 2020;Fromm, 1991). Models of cohousing include Danish and Anglo-Saxon intergenerational cohousing (Falkenstjerne Beck, 2020;McCamant & Durrett, 2011), Central European group-build cooperatives (Hamiduddin & Gallent, 2016), and Nordic urban cohousing (Caldenby, 2020;Laine et al., 2020). Ways of realising the projects range from self-organised projects (McCamant & Durrett, 2011;Sanoff, 2000) to institutional and market-driven development (Krokfors, 2012;Tummers, 2015;Caldenby, 2020). ...
... Self-build procurement results in the development of homes with greater energy performance because self-builders have a long-term interest in their home and therefore make decisions based on its whole life, considering running costs and comfort [41]. Furthermore, the distinctive approach of developing self-build and custom-build homes results in greater architectural diversity and homes that are more closely matched with the needs of the occupants [16]. ...
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... Šitame tyrime nagrinėjami tokie projektavimo metodai kaip "Baugruppen" (vok.), "Group-build housing" (ang.), "Habitat participatif" (pranc.) (Hamiduddin, Gallent, 2015) kas išvertus reiškia "bendruomenių kuriami būstai, kurių projektavimo bei statybos procese dalyvauja būsimieji gyventojai". (Wang et al., 2017). ...
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