An award-winning Passivhaus architect with over 35 years experience in the construction industry, Mark Siddall is one of the pioneers that brought Passivhaus to the U.K. Through his architectural practice LEAP, Mark and his team help self-builders, homeowners and communities by designing new homes and retrofits which are sensitive to the local area and reflect a high standard of architecture.

With a keen interest in building performance issues of usability and practicality inform his approach and have increasingly led to an appreciation of the need for an integrated design process. Mark is a technical advisor to the Passivhaus Trust, has delivered lectures and training in the USA, New Zealand, Germany and the UK and contributed to peer reviewed research.