Passivhaus Affiliate

Standard Members

Membership of the Passivhaus Trust is open to anyone and does not necessarily imply achievement of the Passivhaus standard for buildings or components, or attainment of Passivhaus-related qualifications. Members of the Passivhaus Trust listed include architects, consultants, contractors, manufacturers and other industry professionals, as well as individuals, who support the work of the Trust in promoting the Standard in the UK.

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Waxwing Energy

Little Birch

White Hill Design Studio LLP



Will Rudd Davidson Ltd

Edinburgh and Glasgow

Will Rudd Davidson provides Civil, Structural and Conservation Engineering and Construction Consultant Services from Concept Design to Completion. We provide an exemplary service, and aim to exceed all expectations making the journey as seamless as possible. With main Offices in Edinburgh and Glasgow, we deliver Civil and Structural Engineering services across a wide spectrum of sectors throughout Scotland and across the UK. We are skilled at providing cost effective, practical and elegant solutions. We thrive on Problem Solving, providing robust solutions to challenging briefs. Whether in City Centre gap sites, Buildings at Risk, poor ground conditions or marginal plots of land, we will add value.


William Abbott Developments


William Abbott Developments is a developer and contractor based in the South West of England. We concentrate on building quality over quantity and leaving a positive mark in the communities we work with.


Williams Energy Design


WonKy: People Architecture Cities


WonKy is the partnership of Wai-Piu Wong and Lefkos Kyriacou (Certified Passivhaus Designer) with over 30 years collective experience in practice. The directors have taught extensively at universities and schools and been involved in architectural research and publications. WonKy considers the role of architecture and design in the context of broader societal issues to address problems and find opportunities to create projects that can deliver a significant impact. The practice undertakes research to inform and underpin their projects with an emphasis on the city and urban issues, with people first. The practice collaborates with artists, collectives, community groups and local authorities. WonKy places social and environmental sustainability at the core of the design process with a growing focus on urban ecologies.


Worcester Renewables Ltd



Wyephi Design & Consulting Ltd