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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RDA Architects


RDA is an internationally experienced architectural practice set within the heart of South East London with a very simple philosophy, “we regard each and every piece of work as is if we were the client and the building belonged to us”. Our knowledge and experience ensures that we can comfortably handle a very broad range of projects from large commercial developments to beautifully crafted domestic buildings and sensitive unique renovation work.




Redsix are an independent sustainability and energy consultancy to the construction industry, helping our clients to achieve compliance targets as efficiently as possible. Our in-house Passivhaus, BREEAM and Energy (Part L & EPC) consultants will provide the highest level of quality and service, whilst maintaining a personal relationship with all our clients, making the process as simple and stress-free as possible.


Rees Pryer Architects LLP

Bury St Edmunds

Rees Pryer Architects are an award winning chartered practice based in Bury St Edmunds. Our projects range from individual domestic schemes to complex multi-disciplined projects. We pride ourselves on providing well-considered and innovative design solutions that meet both Clients’ needs and reflect the character of the area in which we live and work. We believe that the design solutions and integrated systems that are most successful in their implementation are those that are mostly passive, and in essence, simple in their application. By working closely together these principles can be developed to ensure the Client realises a thoroughly successful long term solution.


Retrofit Windows Ltd


Rexstone Builders Ltd



Richard Clayson

Bexhill 0n Sea

Richard Coles Builders Ltd



Richard Gaete-Holmes


Richard Haig



Rimes Solutions

Newcastle upon Tyne

Robert Cohen

Neston Corsham

Robert is Technical Director at Verco and the Technical Lead for the ‘Design for Performance’ initiative. Robert sits on the UK Green Construction Board Buildings Mission Task Group, the Climate Bonds Initiative Low Carbon Buildings Technical Working Group and the BBP Sustainability Benchmarking Working Group. He has also served on Advisory Boards for UK government Departments, the British Standards Institute and CEN Standards Committee TC89/WG4.

Rockliffe Williams Architects



Ruth Butler Architects


Ruth Butler Architects is an award-winning RIBA Chartered Practice based in Hampshire and specializing in Passivhaus developments. We are passionate about working with clients to create modern, low-carbon architecture. We work on a broad spectrum of projects, including sport and leisure facilities, educational buildings, sensitive conservation and refurbishments and residential buildings. Ruth has successfully delivered Passivhaus-certified new-builds and deep retrofit projects to EnerPHit standard. We have an established track record for achieving planning permission on difficult sites. Ruth is an RIBA Client Adviser to Councils and Universities, a member of the Oxford Design Review Panel and an examiner for Portsmouth University.


Ryder Architecture

Newcastle upon Tyne