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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PAAD Architects Ltd



Paper Igloo Ltd


We are a small flexible team currently based in Glasgow who believe that fantastic architecture should permeate every aspect of your daily life. We aim to create site-specific high quality design solutions at any scale – the spaces in which we all live and work should be sensory, exciting, inspiring, imaginative and fun. Our experience includes time spent working on site so we have a practical understanding of construction, which we believe will give you a more thorough and thoughtful solution. We are building a strong commitment to low-energy design, and one of our directors is a certified Passivhaus Designer.




Providing low energy solutions – creating energy efficient buildings – we strive to inspire efficiency in every aspect of work we do. Whether constructing complete Passivhaus timber frame buildings, renovating or crafting smaller extensions, we will ensure that we deliver only the highest levels of comfort and energy efficiency. Our attention to detail doesn’t stop at how the house performs, it carries through all aspects of our work.


Passive House Systems Ltd


Passive House Systems Ltd have been involved in air tightness in new builds and renovations since 2008. We are proud to be the distributors of the German manufactured Gerband Rooftite system of products in the UK and Ireland. We are continuously listening to our various customer types and improving our product range to meet increased levels of air tightness and vapour control. While headquartered in Essex we provide an unrivalled service to our customers in the UK and Ireland, especially with product support and supply.


Passivhaus Associates

St Andrews

We provide design, consultancy and build support services for Passivhaus and "close to" Passivhaus projects. Graham Drummond and Chris Morgan are the principals. Our first project, the Craigrothie certified Passivhaus, was completed in 2011. We are based in Fife, Scotland and are actively involved with the Passivhaus Trust Scotland Group.


Passivhaus Design Solutions



Passivhaus Homes Ltd

London and Devon

PHH supply a complete construction solution, PH15, for Passivhaus housing projects. PH15 covers the three essential Passivhaus elements, the thermal shell + triple-glazed windows + MVHR system. PH15 has been optimised to minimise thermal bridges, to deliver excellent airtightness, to effectively manage any overheating risk, & to keep the uplift in costs to a minimum. PH15 makes use of off-site construction methods, alongside use of natural materials that sequester carbon. For more details & example projects visit ( PHH also run an online store for Passivhaus related materials and products ( supported with good technical advice.


Passivhaus Living Ltd


We are a team developers looking to assist in the greater goals of providing a more resilient form of living. On that we have just set up a new company called “Passivhaus Living Ltd”. We have sat with our Architects and produced what we believe are quality homes that we would want to live in, being of a Passivhaus standard. The aspiration is to provide schemes that deliver the building blocks of great communities.


Paul Heat Recovery Scotland


Being actively involved at the start of Passivhaus in Scotland from 2010, we have focused on its specialised ventilation technology, partnering with PAUL, one of the first and foremost German MVHR manufacturers. As such, the University of Strathclyde invited us to provide practical training in MVHR for the CEPH course. Our no-compromise approach in terms of equipment, ducting and installation, with emphasis on customer service and sound advice has lead us into a different direction than most competitors. Foreseeing the future of demand controlled ventilation, we have recently added Cascade Ventilation Systems with minimal ductwork for smaller dwellings


Paul McAlister

County Armagh

Paul Testa Architecture


We take our values of good design and fundamental sustainability to offer our clients good value, healthy, flexible and useful buildings. Architecture is all about people, and we aim to create buildings in which, above all, people enjoy living and working.


PD Consulting


PDP London


PDP London is a 120 strong London and Hong Kong based international practice, known primarily for our skilful integration of contemporary architecture within historic environments. We work across a variety of sectors, primarily existing and new residential but also extra-care, commercial, civic and mixed used developments. Our projects are developed with sound environmental principles and sustainability in mind from the very start. We focus on a Fabric First approach to building design, maximising the performance of the components and materials that form the building fabric, before considering the use of active services. This approach can reduce capital and operational costs, improving the energy efficiency and reducing carbon emissions.


Pen Y Coed Construction & Insulation


From Passive House design and construction to high quality joinery finishes, we pride ourselves in creating beautiful and sustainable buildings. With over 25 years' experience, we prioritise a 'Fabric First' approach that starts at the design stage, using materials and products that maximise the performance and energy efficiency of the building. Our timber frame houses begin life in our factory in Wales as fully engineered, insulated and air-tight closed panels. The panelised units are then transported to site where a weather protected structure can be assembled in a few days. The materials in our build systems are predominantly timber based and procured locally where possible. By using Warmcel cellulose fibre insulation along with timber and woodfibre lining boards, timber I-beams, timber windows, and timber cladding, carbon is locked-in to create a sustainable building that is healthy, comfortable and enjoyable to live in. Warmcel has also been awarded a Nature Plus Certificate. Full technical information is available on our website: and


Peter Holmes


phi Architects

Greater Manchester and Ripon

The Phi group reflects a design philosophy of “smart" architecture, sustainable and environmentally responsible design. Architects and Certified Passivhaus Designers, Claire Jamieson and Sara Darwin work in the Yorkshire and greater Manchester regions respectively, sharing knowledge for best practice details, construction and Passivhaus modelling. Sara specialises in modern residential architecture, from extensions and low carbon retrofits to Passivhaus new build dwellings. Sustainable design excellence is always the priority; a fabric first approach is inherent to phi architects’ philosophy and where possible the Passivhaus standard is set as the benchmark. Claire works as a Passivhaus design consultant, preparing PHPP, advising on practical solutions both “on-site” and through the design phases. Having recently completed her own self build EnerPhit Passivhaus she is keen to share her knowledge and practical application through all types of renovation and new build work as a specialist in the professional team. Claire also lectures on her work, writes Passivhaus articles, and is a member of the Yorkshire Design Review Panel.


phi Architecture Consulting


Piers Sadler Consulting


Piers Sadler is a Certified Passivhaus Designer and Consultant based in Bristol but working in all parts of the UK. Piers works on both domestic and non-domestic Passivhaus projects, with project experience including a range of private houses, a 26 unit Passivhaus scheme in Bristol, the proposed Carmarthen archive repository and offices and Gorslas Primary School in Carmarthenshire. Piers collaborates with architects, engineers, contractors and Passivhaus Certifiers through the project life cycle. Piers advises on the building fabric, construction, airtightness, thermal bridging, windows and doors, ventilation, heating and domestic hot water systems and undertakes PHPP modelling to develop and optimise Passivhaus design. Piers is also experienced in low energy building refurbishment, not necessarily to the Passivhaus standard.


PK Property Limited


P K Property is a small property company based in Douglas on the Isle of Man. The company is run by Paul and Katherine Bergin. We both have a long standing interest in Passivhaus and have recently bought a site on the Island where we hope to build a Passivhaus for ourselves. Paul is a chartered civil engineer with significant experience of building. Katherine worked in the UK electricity industry prior to moving to the Island.

Plumb Solar



Poulter Architects


Poulter Architects is an RIBA Chartered Practice based in Stockport, Greater Manchester. We are committed to designing modern, sustainable and low carbon buildings of lasting quality. Our expertise is in housing, ranging from the renovation of existing dwellings, to individual houses, as well as housing schemes. As a certified Passive House Designer, Jeremy Poulter is able supplement the architectural design, by applying Passive House principals and detailed design analysis at every project stage, from inception to completion. We would welcome any enquires for EnerPHit or Passive House dwellings, across the North West, as well as Staffordshire, Derbyshire and South Yorkshire.


Powell Dobson Architects Ltd

Cardiff, London and Swansea

Powell Dobson is one of Wales’ largest independent architectural practices dedicated to the design and delivery of outstanding buildings. We aim to design buildings that are an inspiration to their users, provide a strong identity whilst responding to their context and that fully embrace our commitment to sustainable design. Our approach to sustainability is embedded in our design process and we have developed senior staff with specialist skills related to environmental design, low carbon technologies and the wider sustainable agenda. We have recently invested in Passivhaus, with our Director of Sustainability Dr. Antony Davies, qualified as a certified Passivhaus Designer as well as one of our Technical Associates, Oliver Henshall. We are currently underway on our first Passivhaus homes for Curo on their flagship development at Mulberry Park in Bath.


Prewett Bizley Architects


Prewett Bizley architects have developed a deep interest in developing into low carbon consuming buildings, either new or existing. We believe in a fabric first approach based on the rigorous approach implicit in Passivhaus philosophy. In the face of the massive carbon reductions that the UK needs to make in the next few decades, we see the activity of architects as crucially important. The AECB have shown great leadership in low carbon building and the advent of the Passivhaus trust is a significant step forward for the UK in knowledge and skill development.


PRS Builders


PRS Builders is a dynamic firm of professional building contractors operating across Greater London and the South East of England. Established in 2006, we are fully participating members of the Federation of Master Builders, Passivhaus Trust and AECB the sustainable building association. We offer a complete turn-key package, providing fully insured project management services delivered by our team of accredited professionals. This means that we always achieve the design, no matter how complex or challenging. Our specialties are architect driven projects. Especially “Passive House,” the global leading environmental build system in which we have acquired an industry leading reputation. Our portfolio includes a number of completed projects, and many testimonials from clients and our architect project partners that endorse the quality of our work.