Perched on a steep, challenging site in Redcliffs, Christchurch, the Augusta Treehouse by Performance Architecture is a compact and energy-efficient two-bedroom home. Designed to feel like a "treehouse," the 65-square-meter dwelling, which has a footprint roughly the size of a double garage, was conceived for a couple committed to simple, compact living. The house maximizes its connection to the dramatic landscape through large feature windows that frame views over the treetops to the Ihutai estuary and the Heathcote and Avon Rivers below. The design of the Augusta Treehouse prioritized energy efficiency and a low-impact construction process. It was constructed with Structural Insulated Panels (SIPs), which, combined with the building's compact form, create a well-insulated thermal envelope that requires very little heating. The interior features a warm, cozy feel, with the SIPs and timber tones left exposed on the walls, roof, and floor panels. To further enhance energy performance and privacy, polycarbonate panels were used in the stairwell, allowing soft, south-facing light to filter in. The house also includes a mechanical heat recovery ventilation system due to its airtight construction. The main living areas, including the kitchen, dining, and laundry, are located on the lower level, while the two bedrooms and a bathroom are situated on an open mezzanine. A skylight above the main bedroom can be opened to purge excess heat during the summer. The thoughtful design, from the efficient use of space to the sustainable material choices, earned the Augusta Treehouse a Highly Commended Award for New Home up to 150m² and a Regional Kaitiakitanga Award at the 2024 Architectural Designers New Zealand (ADNZ) awards. Project credits Architecture: Performance Architecture (Dan McCormick and Hailey Sinke) Builder: Chatterton Homes Photography: Stephen Goodenough Supplier (SIPs): Formance Supplier (Roofing): Metalcraft Roofing