Meet the trainers

Bill Butcher

Director of Green Building Store and Green Building Company, Bill Butcher was project leader of the Denby Dale Passivhaus project. Originally trained as a quantity surveyor, he has over 35 years building experience, including construction of the Longwood low-energy house in the early 1990s. Through his regular fortnightly Passivhaus diary blog, written for, Bill sought to make Passivhaus construction methods accessible and easily understandable for the wider construction industry. Bill is also actively campaigning to introduce the Passivhaus approach in the UK and improve the regulatory framework to facilitate the uptake of Passivhaus design.


Sally Godber

Sally is a partner in WARM: Low Energy Building Consultancy. Sally started her career as a building services engineer specialising in renewable and low energy systems for a diverse range of sectors including historic, industrial and educational buildings. Since joining WARM Sally’s main focus has been on comfort, and how this can be achieved alongside improved energy performance. The Passivhaus methodology was an obvious partner in this aim, and Sally has since been involved in a number of houses, flats, offices and schools designed to the standard.


Nick Grant

Nick Grant is the Principal of Elemental Solutions, a sustainable building consultant with a lifelong passion for doing more with less. His Passivhaus projects include four schools, an archive and numerous housing projects. He is a keen theoretician but also a practical engineer and self builder. He is a Trustee of the AECB and Technical Director of the Passivhaus Trust.


Alan Clarke

Alan Clarke is an energy and building services engineer specialising in Passivhaus design, building on long experience of low energy and ecological construction.  His Passivhaus projects include individual and group housing, schools, community centres and offices.
In addition to design work he is involved in detailed monitoring of several of these projects which are now completed and occupied, learning invaluable lessons about the real life performance of low energy buildings. .


Eric Parks

Eric Parks is an Architect and Certified Passivhaus Designer who has specialised solely in the field of ecological design and sustainable construction in both the US and UK. He has experience in research, development and prototyping of sustainable building systems with CMPBS in Austin, Texas. In the UK, Eric’s architectural training and experience has taken place with two of the UK’s leading sustainable design specialists, Simmonds Mills: Architects, Builders and Eco Arc. Currently, Eric runs his own architecture practice and sustainable building consultancy.


Mark Siddall

Mark Siddall, of LEAP: Low Energy Architectural Practice, is a practicing architect with a keen interest building performance. Issues of usability and practicality inform his approach and have increasingly led to an appreciation of the need for an integrated, consensus based, design process. He was project architect, and Passivhaus Designer, for 25 award winning, Passivhaus Certified dwellings at the Racecourse Estate, Houghton-le-Spring. He was also project architect on a number of award winning Retrofit for the Future projects that targeted an 80% reduction in carbon emissions. Mark is a technical advisor to the PassivHaus Trust and a part time lecturer at Northumbria University. In addition to offering architectural services LEAP provides consultancy, energy analysis, project enabling and training for clients, design teams and constructors. To find out more visit


Peter Warm

Peter Warm is a Chartered Energy Conservation Engineer with a strong interest in understanding how the building fabric works. His experience is varied between research and practical on-site work. Currently, Peter is a partner in WARM: Low Energy Building Practice with his daughter Sally Godber. Peter is accredited by the Passivhaus Institut in Darmstadt to provide certification, and consultancy for Passivhaus schemes.




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