Passivhaus Affiliate

Standard Members

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.




Founded in Germany in 1948, REHAU is now one of the world’s leading polymer producers – developing innovative, efficient and high quality solutions in polymer which meet the demands of both the construction and industrial markets. The company’s reputation has been built on delivering products and systems which exploit the inherent benefits of polymer and offer environmentally efficient, high performing alternatives to traditional materials. A global company, established in 170 locations and with more than 19000 employees worldwide, REHAU has huge resources invested in product development and application. In the UK, it has a large headquarters in Ross on Wye with dedicated technical and product development teams, two large scale polymer extrusion plants in North Wales and a network of regional sales offices and commercial specialists providing advice and support to developers, specifiers, and contractors. The company’s product range includes market leading Passivhaus window, door and curtain walling systems, developed in both PVC-U and composites. Hugely versatile and capable of producing frames in a wide variety of shapes, styles and colours, REHAU is a popular choice across the retail, trade and commercial sectors. Alongside window systems, REHAU also manufactures other products for the construction market including renewable energy solutions, cable management systems and highly specialised pipework and fittings for plumbing and underfloor heating, district heating and ground source energy applications.


Richard Haig



Rio Architects




Author of the Housebuilders Bible and freelance journalist. Have been involved in energy-efficient building since the 1980s. Twitter: @slopingsite.