This paper describes the planning and design of the Sainsbury development in Camden. The project, which was completed in 1989, includes a supermarket, housing, workshops, and a carpark, and is built in the modern style of architecture. The site planning, site investigation and structural design of both substructure and superstructure are described. Special mention is made of the close cooperation between architect and engineer required and achieved at all stages during the design process. Conceptual design work is illustrated for the supermarket, which is the main feature building on the site. The design approach for stability, movement and protection against accidental damage is explained. Structural steelwork for the supermarket is unusual, and the design, detailing and fabrication techniques employed are described. Brief details are given of construction and testing.