The site lies within a private, gated community of chalets and houseboats at The Kench on Hayling Island. The site has water frontage overlookong Langstone Harbour and Portsdown Hill to the north. The harbour has multiple environmental and nature conservation designations: Special Protection Area (SPA); Special Area of Conservation (SAC); Ramsar and Site of Special Scientific Interest (SSSI). Our brief was to create an architecturally outstanding weekend and holiday dwelling on this unique site, for a large family and their guests, to make the most of the magnificent views overlooking Langstone Harbour SSSI and to facilitate outdoor activities on and off the water. The project also involved raising and reinforcing the concrete sea wall to improve flood protection and reconfiguring the steps to improve access to the harbour. The building is conceived as an abstract cuboid “floating” just above the ground, simple and compact in form, and finely detailed. Smooth, light grey fibre-cement cladding panels establish a modular pattern into which darker full height windows are inserted. A hardwood ramp and deck wrap the building on two sides.