What if your home were also a birdhouse? With the bird brick, an award-winning design by Aaron Dunkerton, your building can double as a nest for endangered house sparrows. The bird brick is made of five clamp-fired bricks and serves as a robust, insulated nest that fits into the wall of an apartment or another structure such as a garden shed. Installing just one bird brick can help your avian neighbors adapt to urban sprawl, but incorporating two or three is best because house sparrows evolved as communal nesters. The bird brick is local to the UK, as the bricks are cast in West Sussex by MBH Freshfield Lane. Although relatively hands-off, the structure must be cleaned every two to five years between September and November, when the birds are out of their nests. Access to the nest is simplified by a circular brick piece, which serves as both the bird’s front door and as a cap that can be removed for cleaning. Keep the bird brick in mind for your upcoming construction projects and give house sparrows that have lost their nests an elegantly simple place in modern architecture.