A female Powerful Owl Ninox strenua was banded as a nestling at Lysterfield, Victoria, in 2001. She was found in 2007, 19 km south-west of her natal site, in the Melbourne suburb of Blackburn, nesting in an artificial hollow, where subsequently one young was successfully raised. The nest-box was provided by a local community group after becoming aware that the Owls were attempting to breed at a site where suitable hollows are scarce. Nest-box design is presented, and issues relating to the use of nest-boxes are outlined.