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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AD Practice Ltd

St Albans

Founded in 1992, A D Practice Ltd is a small, well-established and multidisciplinary architectural design practice located in The Mill, Wheathampstead, Hertfordshire. We aim to work with clients and value our ability to listen and learn from them in order to create effective low energy solutions that form spaces that both work for people and improve their quality of life. We are also members of the AECB and Green Register and have a Certified Passivhaus Designer within the team. We are about to go on to site with our first EnerPHit project of a 1960s house in Harpenden and have several new Passivhaus dwellings and another EnerPHit project on the books.


ADAM Architecture


ADAM Architecture is a leading UK practice specialising in classical and traditional architecture, and contextual urban design. The practice is run by Nigel Anderson, Hugh Petter, George Saumarez Smith and Robbie Kerr, and has offices in Winchester and London with a team of around 90 staff. The directors lead their own projects and have their own design ethos, while working together as experts in the field of classical and traditional architecture. Through their involvement in professional organisations, education, research and writing, the directors have advanced the acceptance of traditional design in the British architectural profession. Our portfolio of projects, across the UK and overseas, include new town and country houses; conversions, renovations and extensions; historic buildings; commercial and institutional buildings; residential developments, masterplans and new urban designs.


Adever Construction


Adever is a Chartered Building Company based in Denbigh, North Wales and Wirral since 2003. Adever prides itself on producing excellent projects. We have quality standard ISO 9001, 18001 and 14001. The company has 42 full time employees. We have extensive experience in house building, general building and complex refurbishment projects. We work for local authorities, police authorities, retail and private clients. Adever can collaborate with design teams to confidently help its clients reach the rigorous international standards of Passivhaus and produce an excellent quality build. We are also members of AECB.


Advanced Housing Systems

Gerrards Cross

Our services are broad and detailed - we will help with any aspect of your build, from finding the best architect that suits you, to our TotalBuild and ManagedBuild services that insulates you from the difficult and time-consuming aspects of building so you can concentrate on the design elements that make it your own. For a more detailed look, go to SERVICES. Our products marry advanced technologies in areas such as thermal and acoustic insulation while using traditional wood based materials which are high performance and carbon zero or better.





Air Testing UK



Airflow Developments Ltd

High Wycombe

Airflow Developments Ltd have been producing ventilation solutions for sixty years and provide the widest range (8 models) of Passive House Institute approved Mechanical Ventilation with Heat Recovery (MVHR) units for both residential and Commercial buildings in the UK. Our team of experienced system designers will take your plans and guide you through from specification to installation ensuring you create a healthy, low cost heating dwelling. Operated by a choice of ‘On-Demand’ control options our range of reliable, quality products coupled with the innovative and compact ‘Zero Leakage’ radial ductwork system help deliver a comfortable, low energy environment for both building occupants and owners alike.


Alan Clarke


Alan Clarke is an energy consultant and building services engineer specialising in low energy and passivhaus buildings.

Alchemilla Architects Ltd


Alchemilla Architects Ltd is a RIBA Chartered Practice based in rural Somerset in the Blackdown Hills. Our work ranges from single houses and small housing estates to extensions and refurbishment projects. A development of high end holiday lets, a conversion of a listed building to offices and a swimming pool are part of our current workload. We see architecture as integral to the built environment, and pride ourselves in providing a full service from inception to completion. Part of this is a strong commitment to energy efficient buildings with our principal architect being a certified Passivhaus Designer.




AlchemyGreen is about collaborative transformations and integration. As well as Architecture and Project Management, we have a solid track record in Management Consultancy for professional practices in the construction industry, both architectural and engineering. We offer a range of services, either as standalone tasks, or as a combined consultancy, including architecture, project management, construction management, construction direction, management consultant and expert witness. Our founding director, Colin Mendelowitz has over 35 years’ experience and a track record of successful delivery for blue-chip clients. The architectural service already comes with project management built-in, because that’s the way we work. We believe that these services should always be integrated to give clients the best value, and that experienced architects make the best project managers. We have partnering arrangements with a number of key consultants, to enable end-to-end solutions, including construction. We can often get to the parts of projects others can’t reach! Why? Because we are able to understand the project as a whole as well as the complex interrelationships between the discreet parts.

Alex Reeves


Alexandra Hawkins


Alina Ohriniuc


Allan Corfield Architects Ltd




Milton Keynes

Altechnica is a Zero Carbon / Super-Passive Solar Architecture, Technology Innovation and Renewable Energy Consulting practice established by Dr Derek Taylor in 1990 to carry out commissions, research and projects. Altechnica reviewed renewable energy potential in Uttlesford, Merton BC and in Kent. They are currently the architect/renewable energy consultant for a Super Passive Solar™ Zero Carbon House in West of England, which combines zero carbon design with innovative technologies to achieve one of the most energy efficient houses in the UK, designed to achieve PassiveHaus standards. Altechnica is developing a family of innovative Altechnica Zero Emissions Dwellings™ intended to result in zero emissions of CO2 and to obtain practically all of its energy requirements from building-integrated renewable energy and require no space heating.


Amir Tahouni


Andrew Imlach


AIS is an independent building surveying consultancy. The practice was set up in 1994 and has been providing a range of services to commercial, the third sector and private clients.

Anne Thorne Architects Partnership


The 15-40 collective of architecture practices share a commitment to radically reduce the energy consumption of buildings through a ‘fabric first’ approach. Anne Thorne Architects, Arboeal Architecture, CTT & Passivhaus Homes, Good Architecture, Prewett Bizley Architecture and Suetake Studio, who form 15-40, include 7 Certified Passivhaus Designers, and have extensive experience in delivering well designed sustainable new build and retrofit projects. By co-operating to share ideas, knowledge and resources 15:40 is able to offer clients a greater depth of expertise.


Arboreal Architecture


We design beautiful buildings that are integrated into local and planetary ecosystems • We consider plants and animals as well as people and make habitat for all • We value existing conditions and skilfully retrofit them to improve their character and quality • We create places where people can feel connected to the natural world • We use architecture to help prevent climate breakdown • We love wood.


Arc-In-Form Architects Ltd


Arc-In-Form Architects Limited is a Chartered Architects Practice in Colchester, with a portfolio of successfully completed private residential projects. The practice is led by Justin Smith, a Certified Passivhaus Designer, an architect with a passion for Passivhaus and a keen interest in reducing climate change through low energy buildings. We are committed to low energy, Passivhaus and Retrofit projects. Our residential projects include small sites with multiple houses, complicated extensions, renovations, refurbishments, conversions, and energy-efficient dwellings. We have worked on listed buildings, in conservation areas, city centres, the suburbs and green belt. Every project large or small, incorporates Passivhaus "Fabric First principles", whether that be an extension, or a new build. We are committed to helping our clients maximise their opportunity of low energy design, reducing operational and lifetime cost in every project we do. Our work enhances daylight, sunlight and space in every building we design. The CarbonLite Certified Passivhaus Designer course highlighted the energy performance gap in the UK, which we are keen to close through careful design, detailing and quality assessment on site during construction.


Architectural Design Ltd


Architectural design Ltd was founded by Bryan Thomas in 1991. We work mainly on domestic new build, conversion and renovation projects within a 30 mile radius of our office in North Herefordshire. Bryan is a Certified Passivhaus Designer and we are currently working on our first Passivhaus project just over the border in Wales.



Your home extension, new build or commercial assignment is one of the most important projects you will ever undertake. It takes careful understanding, passionate commitment and sheer quality of design to deliver your vision - and future proof your plans. ArchitectureLIVE offers outstanding expertise and our innovative and cost-effective designs have brought delight to clients in Surrey, Hampshire, West Sussex and beyond. We champion cutting edge technology and sustainable design to deliver energy efficient homes which are pleasant to live and work in, with constant room temperatures and ample daylight. Such buildings ultimately help insulate our clients from the ever-rising cost of energy and relieve the impact on the environment.




ArchitecturePLB is a design-led practice with offices in Winchester and London. We have a diverse portfolio including projects of all sizes and types. Our approach is to listen to our clients in order to develop richer, more meaningful briefs as the basis for innovative design solutions and buildings that enrich the lives of the people who use them. Our starting point for design is a sense of responsibility – both social and environmental – because we believe that good architecture can make better places. We are realistic and pragmatic in our approach, but know that our work also has a more creative purpose: to challenge expectations and lift the spirits. For ArchitecturePLB, a sustainable approach is central to our ethos and the practice has a long track record of inventive sustainable design solutions across a range of different building types. As well as being Passivhaus Designers, we are experienced in implementing BREEAM, designing to achieve Excellent and Outstanding targets and have applied the SKA environmental assessment methodology on a range of refurbishment projects.




Argyll are a team of building specialists with a proven track record in the high-end residential, commercial, hospitality, education and retail sectors. We operate across the South East of England and have also managed projects in Scotland. Since 2003, Argyll have built a reputation for delivering high quality, innovative building solutions to private and commercial clients, including Knight Dragon, Allied London, Maléne Birger, Harrods Estates as well as a number of UHNW individuals. We have developed a strong expertise in Passivhaus construction and design, and our team have delivered a multi-unit Passivhaus scheme on an Island in East London.


Ashleigh (Scotland) Ltd



Aspectum Chartered Building Consultancy


A professional multi-disciplinary Building Consultancy serving South and West UK, founded by Trevor J Barfoot C.Build E CABE MCIOB AssocRICS. in 2011. Over 45 years’ experience in building construction, civil engineering & contracting. Covering all forms of building design and construction, energy efficiency, M&E, contract administration, project management, architectural design, structural engineering, conservation, building surveying and pathology. Proactively, constructively and collaboratively working towards Net Zero Carbon Construction with better design, operation and maintenance producing good quality healthy low carbon sustainable buildings by being innovative, open to new ideas but keeping it simple wherever possible.


Associated Architects LLP


Associated Architects was formed in 1968 and aims to create architecture of the highest quality which embodies a deep sense of responsibility towards our clients, the users of their buildings and the environment. Based in Birmingham, we have designed buildings in the UK and elsewhere, across the private and public sectors. These include schools, universities, offices, housing and urban regeneration schemes. Underpinning the continuing success of the practice is our ongoing commitment to the delivery of a highly professional service, and sustainability in the widest sense. The number of awards received by the practice recognises the consistently high quality of our design.


Atkins Global



Aura (Sound & Air) Ltd

St Helier, Jersey

Austin Design Works Ltd


We offer Architecture and Landscape Architecture services undertaking a very wide range of projects, varying in scale and complexity. These include the design of bespoke new build houses or remodelling and extending existing homes. We also design buildings for commercial, educational and leisure use. Low energy design is of great importance to us and we use our expertise to create buildings that require minimal energy to run whilst also creating healthy and comfortable internal environments. We are advocates of the PassivHaus design approach and have the inhouse expertise to design to this standard. We relish working throughout all project stages and value a collaborative and informed design process. Our projects arise from a good understanding of the context and spirit of your site and requirements. We treat each project individually, to deliver high quality buildings and landscapes which offer value, functionality and delight.





Axis Energy