Located in the London Borough of Wandsworth close to Clapham Common and Lavender Hill, 4-8 Hafer Road is a cooperative housing development replacing 8 existing flats on a former bomb damaged site with four maisonettes and a further 12 residential units. Flats are arranged with dual aspects with a combination of external terraces, projecting balconies and recessed terraces at roof level surmounted by a biodiverse brown roof with PV cells for renewable energy.The building was constructed in in-situ reinforced concrete frame with light gauge galvanised steel structural framing system for the external brick cavity wall support. This allows substantial thermal insulation and flexibility in opening positions for various window types and concealing rainwater down pipes within the external wall construction so as not to disrupt the neatness of the façade and internal space.