Jon Broome is an architect, who has self-built two houses. He was for many years Director of Architype, a London-based architectural practice working on housing, education, health and community buildings with specialist expertise in low energy design, timber-frame construction and sustainable building. He is co-author of The Self-Build Book and contributor to Housing & the Environment, published by the Chartered Institute of Housing. He lives in London, where he runs his own consultancy specializing in sustainable construction.