Stairs of Courtyard House by COX.

Before & After: A Blighted Boarding House in Sydney Is Now an Adaptable Courtyard Home

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The design intention was to keep the stair as simple and understated as possible. It's crafted from plate steel stringers and blackbutt timber treads. A central steel truss "hovers" between the stair flights and includes blackbutt uprights. A pivoting door beneath the stair opens out to the courtyard.