This note, DES 1, originally published in May 1995, was reviewed by David Oppenheim in August 2000. A small 1500 m² net lettable area two storey energy efficient office building was designed using a Participatory
Design Approach. Ecologically sustainable design is a multi-disciplinary task at all stages, and this design strategy was chosen because it best suited the problem to be solved, and ensured that energy efficiency was integrated from the beginning of the project. This case study describes this design method, the project team, the use of energy targets and computer modelling.