Passivhaus Affiliate

Standard Members

T Richard Jones (Betws) Ltd


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.


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.


The Casey Group Ltd


Strong leadership has meant that Casey has stayed at the forefront of changing practice. Delivering the UK’s first large scale retrofit EnerPhit project, of 32 maisonettes in Manchester, saw Casey develop ground breaking techniques to achieve the prescribed standards. Better housing, better social environments and a better standard of living help create communities that are better integrated and that enjoy a heightened sense of unity. Preserving the environment, commitment to quality and caring for the community are the three central principles on which Casey places its business. It is these that give company its enviable record of delivery of first class product on time, within budget and with the highest regard for quality, safety and customer satisfaction.


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:


The Make Group


Make is a design led chartered building company based in Bristol. Working on creative construction projects; Make will deliver on-time, to budget and with no defects. Bringing experience of major contracting to the domestic market, Make can call upon a skillset that is rare amongst local builders. This enables us to tackle the larger and more complex domestic projects. At Make, we Design, Plan, and then Build. This may take a little longer, but it gives us the time to build relationships and to build quality.

Total Home Environment Ltd

Moreton in Marsh




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.