John Butler

Sustainable building consultancy.

Certified Passivhaus Consultant.

Enabling low-carbon high-comfort building and retrofit

Combining practical guidance and hands-on experience with research and interrogation of data. Working in both brand-new buildings and sensitive retrofit of historical buildings, John provides Passivhaus calculations with design and construction support, life-time embodied and operational carbon calculations, and advice on suitable materials and approaches for high-comfort, low-carbon construction.