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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T Clarke Contracting



T2 Architects Ltd


T2 architects is an award winning, design-led practice, specialising in progressive housing design. We have chosen to do one thing and to do it well; to design great places to live. To achieve this, we have built a team of experts in architectural design, sustainability, planning, and conservation. This includes having our own in-house certified Passivhaus Designer, MRTPI Planning Consultant, and an accredited Conservation Architect. Having these disciplines working directly together allows us to offer a more comprehensive service to our clients. We listen to our clients, analyse their site, create design options to fulfil their brief, ultimately deliver buildings we are all proud of. We work with a wide range of Clients across the country and work hard to understand their individual needs. We have good experience of working with Local Authorities, Developers and House Builders, and individual Homeowners. We fuse modern design and building practices with our respect for tradition, creating buildings that are of their time, of today. We create architecture which is context driven, robust, distinctive, sustainable and profitable. We advocate designing buildings that reduce operational energy consumption, and provide a comfortable environment for the occupants of the building. We are currently delivering a number of low energy projects to Passivhaus and AECB building standards, as well as having completed projects to BREEAM, including up to Excellent level. We are delighted to be members of the Passivhaus Trust, in addition to being an RIBA Chartered Practice, as well as being members of the Good Homes Alliance and AECB. Our approach is unpretentious and straight talking. We like to keep things simple.


Tate Harmer LLP


Our practice is committed to developing sustainable low-energy architectural solutions achieved by understanding our client's requirements and mimicking natural systems whilst embracing cutting edge developments in construction and computer technologies. We design buildings that bring architecture and nature together.


TCS Construction Consultants



Tectonics Architects Ltd


TECTONICS is a design led architectural practice based in East London. With extensive experience in residential projects, Tectonics have completed urban site in-fills, bespoke alterations to traditional London housing stock and complete new-build properties. The practice is also involved in cultural and community buildings including various international planning proposals. Sustainability is at the heart of the approach to each project, incorporating the best use of natural light, ventilation and solar gain, good quality materials and reduced energy consumption techniques wherever possible.


Terry Huggett Developments


In 1967, Terry Huggett Snr set up Mexborough based Terry Huggett Developments Ltd, his aim to build a company with great merit and style. The business has been handed down to Terry Huggett Jnr, where the company has gone from strength to strength, winning multiple design awards. Over the years we have built up a loyal client base, and we are proud to say that we are still growing and investing our trusted, professional team at THD, enabling us to continue to deliver our precise quality and vision time and again to everyone who commissions us to deliver their dreams. Our company ethos centres around stress-free sustainable builds and attention to detail for a clean, contemporary and sharp finish. We pride ourselves in having the skills and understanding needed to guide every project from concept right through to completion. We have built a solid reputation of being an experienced and trusted company and place great emphasis on the quality of our work and the professionalism and knowledge of our staff.

TG Escapes Eco-Buildings


TG Escapes provide bespoke modular eco-buildings using off-site construction with fully inclusive turnkey service. Built on a timber frame using sustainable materials, the unique spaces feel very different. Natural light and connection to the outdoors help improve educational outcomes as well as enhancing well-being for students and staff alike. Based on biophilic design principles TG Escapes buildings are used for classrooms, canteens, studios, training centres, sports halls, sports pavilions, and more. Energy efficient features like sun pipes, living roofs and active air can deliver buildings which are net-zero in operation.


The DHaus Company Ltd


The DHaus Company is an experimental design and architectural practice. Our practice draws inspiration from experimental mathematical formulae and the natural and built world around us. We believe every project deserves a bespoke architectural response. Successful buildings are not solely the result of good architects; a good client relationship is key to the success of our practice and the projects we undertake. We approach every project with an open mindset – by listening closely to our clients and by taking time to hone their priorities and ambitions through a process of testing, speculation and refinement – we treat the design process as an ongoing conversation with our client. As a practice, we take inspiration from related fields of industry, seeking out new technologies and construction methods to create conceptually unique buildings and interiors. Innovation is cultivated in the office through interrogating the physical limits of materials and through constantly challenging ourselves to achieve our clients brief in new and challenging ways.


The Healthy Home Ltd


The Healthy Home Ltd designs, project-manages and carries out residential retrofits for health, comfort and energy efficiency and specialises in using the appropriate modern and natural materials to ensure a moisture robust result. The director of the company, Richard Bendy, is a certified Passivhaus Consultant who has also successfully completed the AECB’s Carbonlite Retrofit course; he is a BPEC certified MVHR/MEV designer/installer/commissioner as well as being a NAPIT registered domestic electrical installer with a special interest in the use of circadian/sunrise/sunset lighting to improve occupant health.


The Independent Airtightness Testing Scheme


The Independent AirTightness Testing Scheme (iATS) is an authorised Competent Persons Scheme created for companies (including sole traders and partnerships) that carry out Air Tightness Tests for residential and commercial buildings. Our professional scheme ensures that Air Testers deliver reliable air tightness testing reports for developers and building control bodies. Clients are always reassured that the work undertaken by Testers registered with the iATS scheme is delivered to a high standard of quality and integrity. You can find out more about iATS here:


Thermal Image UK


Thermal Image UK carries out air tightness tests and thermal imaging on new and old buildings looking for heat loss. The company was set up in 2008 by Tom Barbour and carries out surveys on a range of domestic and non-domestic buildings. Tom’s motivation is limiting climate change through better buildings, and he has been an advocate of improved building standards and quality control for a number of years. More recently, the realisation that Passivhaus not only sets a higher energy design standard but that you get built what was designed, has led to Tom becoming a strong advocate of Passivhaus.


Thermodul System UK Ltd



Thinking Buildings



Thread Architects Ltd



Tim Martel


Tim is a freelance Chartered Architectural Technologist, Passivhaus Designer and Retrofit Co-ordinator. He is an expert in PHPP and is the author of the AECB PHribbon, an add-on to PHPP that speeds up data entry, checks PHPPs and calculates the Embodied CO2 of buildings. Embodied CO2 is becoming important as the grid decarbonises and heating gradually moves towards decarbonising. What is left is mostly the Embodied CO2 of the building. He offers calculations using the software and he also sells the software on behalf of the AECB (via his own website below). He offers advanced PHPPs that use ‘variants’, a very useful standard feature from the Passivhaus Institute, that allows you to explore different options in PHPP, e.g. different roof types, different wall types or different retrofit strategies. He has also created automated sensitivity testing in PHPPs, design studies which explore the effect of changing individual parameters and also the effect of combining them together.


Tim Saunders


Tooley Foster

Buckhurst Hill

We are an award winning architect; creating inspirational buildings and communities for 130 years. Attention to detail is ingrained into our culture, and our first Passivhaus building (certified in 2015) was a natural extension of innovations in low energy and low carbon construction which we have been developing for thirty years. Since then we have undertaken a number of Passivhaus firsts; including the NHS’ first health centre in 2021, as well as innovative Passivhaus developments for local authorities in London and the South East. Together with Accredited Passivhaus Design (APD) we are able to offer a complete range of services in Passivhaus design, project management and certification.


Total Home Environment Ltd

Moreton in Marsh

We specialise in helping self-builders and renovators to achieve the best possible home environment, in the most energy efficient and cost effective way. Passionate about clean fresh air, we know how to plan, select and install ventilation, heating and cleaning systems to achieve the healthiest outcome for your home and all those who live there. We research and choose our products carefully so you can be sure they give outstanding performance and match your budget. Our products include: • heat pump ventilation • heat recovery ventilation • compact service units (award winning) • air-source heat pumps • air-water heat pumps • central vacuum systems • We also complete MCS reports for air-source heat pumps for the Renewable Heat Incentive and room-by-room heat loss calculations to ensure you get the right heating solution for your home.


Tread Studio




Trecodome provides strategic advises on the transition towards an eco-society, a sustainable built environment and the relation between innovation, investment in sustainability and closing cycles.


Trinity Survey Typhoon Design Ltd


Ty Eco


Tŷ Eco (Welsh for Eco House) produces an economical, panelised Passivhaus building system. We do not use polyurethane, EPS (polystyrene) or any other oil-based products to insulate our wall, ceiling or intermediate-floor panels – from the slab up, the building system is sustainable, renewable and/or recyclable. Our sister company - Minera Roof Trusses - has been producing engineered timber products since 1977. Utilising their extensive manufacturing experience, we have engineered a high-quality building system that can be easily supplied to site and erected quickly with a finish ensured through the Passivhaus quality assurance process. Tŷ Eco is currently constructing a prototype bungalow with a view to achieving Passivhaus accreditation (April 2021).