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.

Join PHT

View Patron members

View members by category

Search map

e-Griffin Consulting Ltd


Irrespective of whether you are a housing association, hotel or manufacturing company building a new factory with a multi-million pound budget or a home owner with a £100,000 extension, our passion and expertise is always focussed on keeping your building costs under control and on budget. e-Griffin Consulting, Chartered Quantity Surveyors, work for clients in local government, industry , retail, schools, architects, developers, hospitality, health and leisure, charities to name just a few, plus homeowners providing unbiased full building estimation and cost analysis service for new construction and renovation work. We also specialise in providing Quantity Surveying services for Passivhaus construction. The e-Griffin Construction Cost Calculator which can be accessed from provides accurate estimates free of charge for anyone wanting to know "What are the likely building costs?" This calculator enables you to make important decisions at the conceptual design stage of your project before any plans have been drawn up.


E3 Consulting Engineers



Earthwise Construction Ltd


Earthwise Construction are a sustainable building company based in Bristol, with over 15 years’ experience. We work with home owners, architects, developers and businesses across the South West and further afield, offering comprehensive eco design & build services, from Passivhaus new builds to EnerPHit retrofits. We have a dedicated MVHR installation and commissioning team with nationwide coverage.


East Ayrshire Council


East Green Homes Limited


Thinking of buying a new Passivhaus home or constructing a new Passivhaus or EnerPHit retrofit home? We spend most of our time indoors, so buildings play an important part in our health and wellbeing. Our Passive House Homes assure a comfortable indoor climate passively in both summer and winter. The team at East Green Homes, have worked on several certified Passivhaus projects as either Contractor or Consultant, including No 4 Ranulf Road, this was the first in London to achieve certification. Planning is often easier with Passivhaus. We will also be shorty commencing our own new Passivhaus homes for sale. East Green Homes Limited are Level 1 ATTMA Registered Air Tightness Testers.


ECD Architects

London and Glasgow

ECD has a track record of successful sustainable projects and a good design process from feasibility to understanding of (and a strong commitment to) sustainability principles and the triple bottom line of social, environmental and economic factors. These principles inform their construction and beyond. They aim to tailor for each new project a ‘Sustainability Agenda’ that informs the core brief and serves as a checklist throughout the design development which is incorporated into their Project Quality Plan.


Eco Arc Architects


Eco Arc is an award winning chartered architects practice and environmental design consultancy committed to sustainable design. We are eco architects specialising in carbon neutral eco (ecological) architecture, eco building and sustainable design. Established over twenty years ago in 1986 to promote a holistic approach to ecological carbon neutral design. Our building designs typically generate their own ‘clean’ renewable energy, harvest their own water and recycle waste materials causing no pollution or CO2 emissions.


Eco Design Consultants Ltd

Milton Keynes

Eco Design Consultants are an award winning Architectural Practice, lead by Alan Budden who is a Chartered Architect and European Certified Passivhaus Designer. Our ethos is to provide FUN enjoyable buildings that are highly comfortable, inherently low energy by, using its form and fabric intelligently so to insure world resources are maintained for our children. We have a number of low energy projects including new build housing, retrofit and extension of houses and community buildings. Our services also include: Architectural design, code for sustainable homes assessments, OC EPCs, LEED assessments, Renewable energy feasibilities, home energy surveys and providing CPDs.


Eco-Renovation UK

Hemel Hempstead

EcoCocon s.r.o

Slovak Republic

Ecological Building Systems


Ecological Building Systems has been at the forefront of Intelligent Airtightness and Windtightness building product solutions and natural insulations for over a decade, gaining the sole agency in Ireland and the UK for ‘pro clima’ air & windtight products; GUTEX wood fibreboards; Calsitherm Climate Board; Diasen Thermal Plaster Systems, Thermo-Hemp/Jute Insulation, Elka Strong Board, Unilin Vapour Block and a full range of complimentary airtightness accessories. Ecological’s products have been used in numerous Passivhaus projects in the UK and Ireland with the team able to provide technical support and guidance, particularly in the area of moisture control, maximizing building durability and occupant health. We have been providing advanced modelling for many years using WUFI as well as U Value and Dew Point calculations and we provide full on-site support.




As a company with over forty years combined industry experience and having partnered with leading industry professionals, Econekt take great pride in being able to offer one of the most advanced Passivhaus and low-energy structural building systems on the market today.




Ecospheric is an award winning Passivhaus consultancy and sustainable property developer. They offer expertise on low energy design to the UKs leading architecture and planning firms as well as developers, social housing providers, and corporations. Their developments include the Zetland Passivhaus project, Europes first certified EnerPHit Plus home, The Sorting Office, a zero waste and zero energy food hall, and, Lymm Hall, the zero energy retrofit of a Grade II listed manor house. In addition, its sister company Ecospheric Windows & Doors supplies and specifies high performance glazing solutions for Passivhaus and low energy retrofit.


EcoVert Solutions Ltd


EcoVert Solutions is a retrofitting, design and building company, committed to using the latest sustainable materials and technologies to dramatically reduce energy consumption in your home. We use a range of ultra-modern and sustainable materials combined with a detailed knowledge of building physics and attention to quality to reduce our clients’ energy costs by up to 80%.


Eden Insulation Ltd


Eden Insulation specialise in modular timber frame using natural materials. Having built numerous Passivhaus projects, Eden Insulation have considerable experience designing and constructing timber frames to the rigorous standards required for Passivhaus buildings. Your frame will be custom made for you to the exact specifications of your architectural plans, using the highest-performing airtightness materials. A typical two-storey frame is erected on site in just a few days, giving you a weatherproof, airtight core built to stand the test of time.


Egon Hansen Architects


Egon Hansen Architects are a practice that have sustainability at their heart, taking a fabric first approach to designing healthy, long lasting buildings for their clients. The fabric first approach is just as applicable to retro-fit projects as it is to new buildings, allowing great gains to be made in terms of efficiency in operation and in the quality of internal environment. Our projects bring benefits to our clients in terms of lower running costs and lower carbon footprints, and positively contribute to the wider environment.


Eight Associates


Eight Associates is a sustainability consultancy with a focus on delivering sustainable buildings, both in the UK and abroad. Our fully accredited team of professionals has unparalleled experience providing consultation and advice on building performance analysis. We provide a range of services related to site specific modelling of energy efficiency, thermal performance, daylighting, feasibility studies for low/zero carbon energy sources, thermal comfort and overheating, thermal bridging, condensation risk and PassivHaus. Eight Associates focuses on dialogue, technical expertise and working with the team to ensure that cost-effective, sustainable solutions are achieved for each of our projects.


Ekistics Capital Advisors LLP


Ekistics is an investor in and developer of luxury prime London residential, built towards the Passivhaus and WELL Building standards. Our market is focused on prime central London. We believe that the next few years will present a good buying opportunity for select properties that require deep retrofit. We provide institutional quality investor reporting and strive to achieve above-market returns. We care deeply about our end customer’s experience, the quality of our working partnerships and suppliers, the materials we source and use, the craftsmanship that goes into every aspect of our work, and our environmental stewardship.

Eksalta Windows & Doors


Eksalta Windows and Doors is a supplier of bespoke, highly energy efficient triple glazed traditional and modern timber windows and doors. Eksalta collaborates closely with architects, builders, engineers and others within the residential and commercial sectors, providing timber windows and doors for energy-efficient refurbishments, deep retrofits, EnerPHits, Passivhaus projects and new low energy developments across the UK.


Elemental Solutions


Nick Grant is a Certified Passive House Consultant with particular interest in innovative cost effective solutions to very low energy design. Nick is a Director of the Passivhaus Trust and long time AECB Trustee. His expertise ranges from strategic analysis to construction details and practical troubleshooting. He works freelance and in association with other professionals to provide design advice for projects that range from single dwellings to schools.


Emma Elston


Energy Council


Energy Council is a construction consultancy providing a wide range of independent services for: Government Bodies, Developers, Housing Associations and RSLs, Contractors and Sub-Contractors, Architects and Designers, Energy Industries and Construction Clients. Specialties: Pre-Construction Design & Advice, Sustainable Design & Development, Passive House Consultancy, Low Carbon Building Design, Feasibility Services, Environmental Assessments, EcoHomes, BREEAM, Code for Sustainable Homes, Carbon Trust Design Advice, Planning Submission Reports, Renewable Power & Energy Services, Part L Compliance, Thermal Comfort and Daylight/Sunlight Assessments.

ENERsign GmbH

Wittlich 54516

ENERsign GmbH is a leading German producer of high-performance windows and doors with than two decades of specialisation and experience on the Passive House market. The PHI-certified superinsulated ENERsign®primus product line of window and door combine seamless aesthetics and technical integration with one of the highest thermal performance available on the marketplace. Our patented ENERsign®primus System is a wood-aluminium window perfectly designed to provide the best possible energy efficiency with minimal sight lines and clean overall aesthetics. The ENERsign®door, ENERslide lift+slide and the ENERsky frameless oversized windows complete the product offering with exceptional products. The wall integrated ENERsign®primus aluminium clad wood windows offer a high degree of both thermal and visual comfort from low conductivity native, natural woods. The surrounding slender visual frame profiles create minimal sight lines while the extra deep profile depth provides excellent stability. The frameless window sash design allows for a continuous glass sight line even where fixed and turn-and tilt elements combined.


Enhabit Ltd


Enhabit uses fabric-first building physics principles to design and build living spaces that are comfortable, healthy, energy efficient and easy to maintain. As a team of engineers, project managers and passivhaus designers, Enhabit uses engineering and building physics to help our clients in building their dream home, on time and on budget. We have a trusted network of building contractors, ventilation, heating and solar technicians, architects and structural engineers to help design, install and commission our building systems. Our extensive product range includes MVHR, solar PV and thermal, air and ground source heat pumps, heating systems, airtightness, insulation and more.

EnviroArchitecture Ltd


Eric Parks: Architecture-Consulting-Training



Erika Stadnik


Eshrar Latif


etc Design Limited


etc Design Ltd is based in the medieval village of Wombourne, South Staffordshire. We are an award-winning RIBA Chartered Architectural Practice, established in 1998, members of the Passivhaus Trust, Green Register and the AECB with experience working both nationally and internationally across all sectors of the construction industry. We work within all stages of the design and construction process, being able to offer a tailored solution to each client, from initial concept to completion. The Practice is committed to providing innovative and sustainable solutions which enhance the built environment whilst benefiting the end user and wider community.


Etive Consulting Engineers Ltd





Etude are a team of sustainability engineers specialising in low energy building design and environmental assessments. We are Passivhaus Certifiers and can help you achieve the Passivhaus standard.


EVR Consulting Ltd


EVR Consulting provides ICT consultancy, procurement and solution services to a range of clients. Bringing together over 35 years experience in the field of education and health care, EVR is proud to offer services to schools, NHS Trusts, Multi Academy Trusts, construction companies, Governments and their agencies. Their experience includes providing a wide range of services to the Department for Education (DfE), Crown Commercial Service (CCS) and the NHS. EVR have worked on over 300 projects in various schemes, including the Academy, BSF, PSBP, SRP, Modular Frameworks A/B/C, Modern Methods of Construction, Free School, UTC, Studio School programmes and hospital rebuild projects.


EZ Design & Construction Ltd


E Z Design and Construction Ltd is founded by Erdal Zorbozan, degree qualified construction professional with a special interest in Passivhaus, passive design, environmental analysis and design, low energy, comfortable, sustainable building design and engineering