Passivhaus Affiliate

Standard Members

Sapa Building Systems Ltd (UK)



Sarah Small Architects


Sarah Small Architects began in 2009 in Weymouth, Dorset. It is a small design led studio that specialises in sustainable architecture.

Seesaw Studios


Self Builder


Seven Architecture


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


South West College



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.

Stroma Technology



Sued-Fensterwerk GmbH & Co


Premium energy efficient windows and entrance doors Suitable for Passive Houses MADE IN GERMANY In 1932, in Westerheim, Alois Kneer founded a small cabinet making shop. Today, we employ a work force of more than 650 at our plants in Westerheim, Schnelldorf and Massen – nowadays, we are also amongst the major manufacturers of windows and front doors MADE IN GERMANY. At our three plants which total approx. 20,000 m² of production space, windows and front doors MADE IN GERMANY are made to order. The production installations are maintained at a state-of-the-art level by way of continuous investments – and set themselves apart by their high flexibility. Kneer-Südfenster is a full-range supplier and produces windows and entrance doors made of wood, aluminium-wood, UPVC, UPVC-aluminium and aluminium. On a yearly basis, more than 330,000 windows and 7,000 front doors MADE IN GERMANY leave our production sites. Our only distributing channels are an area-wide and qualified network of specialised dealers, along with prefabricated-house manufacturers. Kneer-Südfenster offer premium quality, flexibility and innovative solutions with elements, which are meeting the highest requirements related to healthy living and indoor hygiene, certified by the independent Eco-INSTITUT in Cologne. Let us convince you of the variety and the quality of one of the biggest manufacturers of windows and front-doors in Europe!


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.


Sustainable Solutions


Swegon Ltd