This highly engineered structure, which houses a contemporary gym, floats under the tree canopy on a concrete raft just 200mm thick.

Exposed concrete walls were cast in situ and board-marked using meranti that matched the garden fence. The wood was then recycled to form a flexible ceiling under the thin steel roof that cantilevers over the fully openable sliding corner glazing.

The copper roof gives the building a refined elegance that is visible from the upper floors of the house.