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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Sadler Energy and Environmental Services Ltd


Sadler Energy and Environmental Services Ltd is a Winchester based independent Consultancy serving Southern England, providing Sustainable Development Advice, Calculations, Testing and Certification Services to the construction industry including: • SAP Calculations • Energy Performance Certificates (EPCs) • SBEM Calculations • Overheating Analysis • EcoHomes • Code for Sustainable Homes (CfSH) • BREEAM NC Assessments and AP • Home User Guides and O&M manuals • Flood Risk Assessments • Daylighting Calculations • Air Tightness Testing Level 1 & 2 + EA From our Head Office in Winchester we operate throughout Southern England, including: Hampshire, Dorset, Sussex, Berkshire, Wiltshire and Surrey, as well as London.


Sarah Small


Seesaw Studios



Newcastle upon Tyne

SIGA1966 UK Ltd


SIGA is leading in the development, production and distribution of products free from residential toxins for the air and windtight building envelopes with the goal to build a world of zero energy loss buildings. SIGA-sealed buildings are characterized by low heating and ventilation costs, higher standard of comfort without drafts and protection from mould. Know-how, quality, innovation and the consistent striving for sustainability are some of the recipes for the success of the family business. Personal customer contact with building and construction professionals is ensured in over 30 countries around the world by 200 field staff belonging to the company. Thus, the building and construction professional is comprehensively counselled, trained and supported in his company, on site or in the SIGA academy in the head office in Ruswil Switzerland.




SIMMONDS.MILLS architects is an architectural practice based in Shropshire and Herefordshire, established in 1992. The practice has pioneered a diverse range of techniques exploring energy efficiency and ecological materials through its’ built projects. Now the practice policy is to work towards all projects achieving ‘Silver’, ‘Passivhaus’ or ‘Gold’ energy targets outlined in the AECB’s Carbonlite Programme. The practice has a wide C.V. of built projects, and has worked for public organisations, charities, community groups and private individuals throughout the UK.


Simon Spencer


I have many years of experience working with National developers, on residential layouts and commercial architectural design. I am highly practical and motivated by good design both modern and traditional. Sustainability is a key word in these days of environmental consciousness, and my designs take this as a fundamental base, to achieve both client aspirations and Governmental requirements. To this aim I am actively pursuing modern methods of construction including Passive Houses.


Sjolander da Cruz Architects

Leamington Spa

Sjölander da Cruz Architects believe creating great architecture is about really understanding what people need from a building, whilst striving to produce buildings which achieve sustainable and environmental targets through the adoption of a holistic approach in terms of design, materials, energy and transport. Our work is always developed through an inclusive and collaborative process with clients, consultants, contractors and the end users of our buildings. Our philosophy is to design flexible buildings which last. Through the design and realisation of our own award winning Passivhaus building we have gained valuable experience which we apply to our clients projects.





Spring Design Consultancy



State of Design


Founded in year 2000, State of Design is a Cambridge based RIBA architecture practice operating in the Cambridge area and London. Over the years we have perfected flexibility so that in addition to our design skills, we can offer our clients efficiency and cost effectiveness that is hard to match wherever their projects are based. Our ultimate aim is to produce daring and innovative architecture that takes advantage of the latest technological advances, yet it is very personal and respectful towards for the environment. We like working with constraints and the design challenges they pose - in fact, the more difficult the site or the brief is, the better. We are problem solvers. Furthermore the experience gathered from working in the theatre and advertising realm is often channelled towards resolving architectural dilemmas, leading to visually striking yet always practical architectural solutions.

Steve Connor


Stride Treglown Ltd


Stuart King Architecture & Design Ltd



Suetake Studio 2


Junko Suetake is a Japanese architect and certified Passivhaus designer. Her design is characterized by a considered approach to comfort, climate and landscape, using locally made materials where possible. The aim is to create sustainable development, which meets user’s needs, without compromising design quality. She has produced innovative and award-winning spaces for various happy clients in the UK and Japan and believes in the efficacy of collaboration and sharing knowledge with others such as the PHT. The last 6 years have been dedicated to sustainable housing, school projects, and a low energy straw bale community building produced by Anne Thorne Architects.


Swann Edwards Architecture Ltd