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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Carbon Futures (Consultancy) Ltd



A specialised consultancy established to promote the sustainable use of energy and reduce the use of fossil fuels. We provide energy audits and surveys, feasibility studies, project management and verification, utility supplies and staff training. Our Certified Passivhaus Designer service can assist you in achieving the Standard for your building.


CARL Architect



Carrie Fung

CaSA Architects Ltd


CaSA Architects is an award-winning RIBA chartered design practice with a passion for original contemporary architecture using proven sustainable principles. We deliver carefully considered, bespoke solutions derived from a thorough understanding of our clients and tailored very specifically to them and the site. Quality is at the centre of our approach, inspiring and informing everything we do. Our work is principally in the private housing sector, but also includes education and community. We have experience applying Passivhaus principles to a range of building types, incorporating a fabric first approach. We have recently completed a pair of RIBA award winning community buildings in Hampshire built to Passivhaus standards. See our website for details


Castle Building Services



Cath Basilio


Catherine Cosgrove


Catherine McCarthy


Catriona Kinghorn


Cayford Design


Cayford Design is a versatile architecture and design practice creating inspiring and feel-good buildings. In addition to being a Certified Passivhaus Consultant, Paul Cayford is a RIBA Client Adviser, with the mission to embed sustainability and design quality in the procurement process for complex projects.


CBG Consultants



CCA - Christian Capelli Architects


Central Timber Construction



Cercula Limited


Chablis Associates Ltd


Charles Everard


Chris Bravington


Chris Copeman


Church Lukas



City of Edinburgh Council



Claudia Cioli


Clifford Design


Clifford Design aim to help and support clients on their journey to designing and building a low energy and sustainable home using Passive House principles. They are able to help at all stages from early pre-planning with design principals through to offering design and on site technical advice towards gaining Passive House certification. We recognise that clients come with differing experience of the design and build process and are likely to require varying levels of support. As such clients can use our services as much or little as they require to ensure a smooth Design and Build process.


Coast2Coast Architects




ColdProof is run by Eric Fewster, a Chartered Environmentalist and Certified Passive House Consultant. He specializes in using Passive House methodology and thermal bridge modelling to analyse and plan whole house retrofit projects for existing houses – this includes not only the energy analysis that enables homeowners to reach specific space heating demand or carbon emissions reduction targets, but also a practical plan of action which includes MVHR design, material specification, bill of quantities, economic analysis and work sequencing. This is all arrived at through several trial runs in which scenarios for improvements are honed according to the available budget - all done in consultation with the homeowner. He also can act as retrofit coordinator in certain cases.


Collective Architecture Ltd


Collective Architecture was established to pursue themes of participation and sustainability in architecture. Ownership by all brings care and commitment to every aspect of our work. Our ethos encourages individuals to express themselves and research issues which are of relevance to both their work and to the wider society. This has resulted in our architects developing specialist knowledge, accreditation and qualifications, to achieve a range of crucial skills. We share that information and encourage discussion through events, forum, publications and we are active within a number of important institutions.

Coltart Earley Architecture



Comfort Being Ltd


Comfort Being offers Design and Build services for simple yet breath-taking architectural designs, interior fit-outs, project management and costing for Passivhaus and renewable solutions. With research and development as its core principle, exceptional Designers experiment on a variety of materials and construction techniques using evidence based sustainable methods. The young, talented and dynamic team have published a paper to identify the hierarchical importance of key issues for Passivhaus buildings which was recently presented at the International Passivhaus Conference at Vienna, Austria. You can be truly comfortable in your very own Passivhaus and save up to 90% on energy bills. Our dedicated team will design and build your dream home right from inception all the way to completion at very convenient budgets. Whether it is a refurb-extension, new build or an eco self-build, Comfort Being has qualified and certified Passivhaus Designers who are happy to help.

Complete Sustainability Solutions


Complete Sustainability Solutions are an industry leader in the UK, offering sustainable consultancy solutions across all sectors of the built environment. From feasibility, through planning, during construction, commissioning, and handover. Our sustainability consultants are dedicated to working closely with our clients to find optimal responses to current and future regulations, securing a successful and sustainable tomorrow, for all, today.


Concordia Interiors


Concordia Interiors is a London based sustainable design studio offering a holistic residential renovation design and project coordination service to considerate clients. We combine our Certified Passivhaus Consultant skills with our expertise in Sustainable Interior Design to deliver harmonious, functional, healthy and ultra-low carbon housing without compromise on style. Sustainability and our clients’ well-being are the common thread of our designs, from planning applications, space planning, renewable and efficient services, natural insulation materials to completion with interior decoration finishes, accessories and furniture, including our own VOC-free solid wood kitchens and bespoke joinery.


Conker Conservation Ltd


Chartered building surveyors specialising in sustainable design, new-build, conversions, refurbishment and historic building conservation. A family business established in 1999 with experience in using modern and traditional methods of construction including rammed chalk, rammed earth, straw bales, timbrel vaulting (creating large span domes without formwork using clay tiles), super-insulated masonry and timber frame. Working with Passivhaus standard since 2005. We work mainly in the south east on residential, commercial and education projects. We are nuts about sustainability.


Constructive Individuals


Constructive Individuals is a York-based practice run by architect and Certified Passivhaus Designer Phil Bixby. The practice brings to projects over 25 years of experience in working with communities and individuals to enable them to decide, design and build. Past projects have included community self-build and self-help projects, sustainable social and individual housing, and extensive work with children and young people. We have worked as architects, project managers and training consultants, and aim to work WITH clients, rather than simply FOR them.


Contour Architecture Ltd


Contour Architecture is an established RIBA Chartered Architecture Practice, based in Berkhamsted, Hertfordshire. We have provided Certified Passivhaus Designer services since 2016. In that time, we have completed a number of EnerPHit retrofit projects and are working on new build Passivhaus projects together with a number of ultra low energy, non Passivhaus certified designs, to similar standards for clients. Our aim is to exceed the expectations and aspirations of our clients, achieving design excellence through fully integrated, holistic and sustainable solutions, delivered on time and within budget.


Cowan Architects

East Grinstead

Cowan Eco Design, part of Cowan Architects, is led by Mark Elton who has been responsible for numerous exemplary new-build and refurbishment, low-carbon projects over the last 20 years. Cowan Architects has established itself over 33 years with a reputation in residential care homes and housing, including a particular expertise in inclusive design. This brings a good correlation between these sectors and the health and well-being benefits of the Passivhaus approach. With London and Sussex offices, Cowan Eco Design covers the south of the UK with particular interests in residential and community projects, including retrofit to the EnerPHit standard.

CPW Services Ltd



Craig Veldon


Creating Enterprise CIC

Colwyn Bay

Crescent Architects Ltd



Cristina Blanco Montero


Cullinan Studio




Newcastle upon Tyne

Julian is a chartered building services engineer and Fellow of CIBSE with a specialism in sustainable/environmental building design, client design advice and low carbon master planning. He has 27 years of experience. Projects include the Royal Ontario Museum in Toronto, Tower Place in London, the Parkview Battersea Power Station scheme. He has recently completed his own certified Passivhaus in Hampshire and is a regular judge for the Construction News Awards and the RIBA sustainable building award. In 2016 he chaired the UKGBC task group – delivering Building Performance.

Curl la Tourelle Head Architecture


We are a progressive and contemporary community of architects that focuses on sustainable and practical designs through a creative dialogue with our clients, consultants, contractors and communities. We will translate aspirations into appropriate, innovative and joyful buildings through integrated, context-specific design. Our experienced team will create an individual solution for each project, large or small. We welcome new challenges and apply knowledge gained from completed projects to new situations. Our hard-working buildings ensure maximum quality and value. Customer care is at the heart of everything we do. We will listen to you, and we will act on what we hear. We are proud to be building schools, housing, hospitals and community facilities throughout all stages.


Current Electrical Installations Ltd


CVC Systems Ltd


CVC is one of the UKs Leading designers, suppliers and installers of ventilation systems, with over 30 years’ experience in the industry. CVC understands that the requirements for a Passivhaus are different to that of a standard build and has had the privilege of being involved with numerous projects that have acquired Passivhaus certification. CVC offers a free design and quote service; each design is bespoke to the project, we work alongside others involved in the project, to ensure the best system is provided for the project. With a team of national installers positioned around the UK, CVC can provide installation of all our systems wherever your build may be. CVC is the UK supplier of Brink Climate Systems, Passivhaus MVHR units.