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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LAMILUX U.K. Limited

Bury St Edmunds

Lamilux offer industry leading roof light and roof glazing solutions. Our product range includes; rooflight domes, continuous barrel vault roof-lights, EN 12101-2 smoke vent AOVs and large glazed atria. We specialise in the supply and installation of large flat glass roofs. Our rooflight solutions are all free of thermal bridges and we have systems independently certified to the Passivhaus standard.


Larry Soper


Laura Plazas


Ldn Architects LLP





Mark Siddall is principal at LEAP: Low Energy Architectural Practice, is a practicing architect that has a keen interest building performance. Issues of usability and practicality inform his approach and have increasingly led to an appreciation of the need for an integrated, consensus based, design process. He was project architect, and Passivhaus Designer, for 25 award winning, Passivhaus Certified dwellings at the Racecourse Estate, Houghton-le-Spring. He was also project architect on a number of award winning Retrofit for the Future projects that targeted an 80% reduction in carbon emissions. In addition to offering architectural services Mark provides consultancy, energy analysis, project enabling and training for clients, design teams and constructors. Mark has published papers internationally on subjects including; the influence of design and construction defects upon building performance, the quality assurance of building design and construction, whole systems design, environmental management systems, and the impact of glazing systems upon comfort and energy demand. He is a technical advisor to the PassivHaus Trust and a part time Senior Lecturer in Construction at Northumbria University.


Leeds Environmental Design Associates Ltd (LEDA)

West Yorkshire

LEDA was formed in 1997 as a multidisciplinary partnership of design engineers and architects committed to creating sustainable, environmentally friendly buildings. We use our construction experience to make your plans practical and usable. As a firm driven to create buildings with low energy performance that are also healthy and comfortable, we are proud that LEDA can now offer a fully-coordinated building design including static and dynamic thermal modelling, designPH, Passive House Planning Package and Therm modelling. We recently augmented our Passive House capabilities, welcoming Richard Spencer, engineer and sustainability specialist, to the team. Richard completed the AECB Carbonlite Retrofit course in 2016 and became a Certified Passive House Consultant in 2017. Richard will be working with James Clifford, our Architectural & Environmental Design Assistant, and the LEDA team to further support architects and clients with the designs for Passive House and near passive house buildings, including renewables, heat supply and distribution systems, water and electrical services, lighting, and communications.


Legacy Structural Design


Levitt Bernstein



LEVO Design Ltd


Linktreat Ltd


Martin Ingham is an independent consultant specialising in energy efficiency in the built environment. He is a Certified Passivhaus Designer and has a background as a Chartered Civil Engineer and Business Consultant. He has an MBA in Strategic Carbon Management from the University of East Anglia, and has increasingly focused on Passivhaus as being a proven means to deliver low energy buildings. Martin advises clients on their projects from concept through to post-occupancy evaluation. He believes it essential that we ensure our buildings deliver for their occupants - in practice not just in theory. Martin has led performance evaluation studies funded by InnovateUK (formerly the Technology Strategy Board) and by ERDF, of domestic new build and refurbishment, as well as non-domestic new build. Studies include ongoing assessment of the award-winning Wimbish Passivhaus development.

LJR+H Architects


Mark is an Architect with over 25 years’ experience, and a partner with LJR+H Architects in Dundee. Throughout his career he has been fortunate to work on many challenging, interesting and award winning buildings including the Maggie Centre in Dundee, the Shed and Zinc House, both of which won the Scottish Design Awards best private dwelling in Scotland award. He is a registered as a Certifier of Design for energy systems and hoping to expand on this through Passivhaus design. Mark combines practice with teaching design at the University of Dundee.


Loft Ladders



Longboat Inn


Lorraine Whistance

New Radnor

Lorraine Whistance DipArch MCIAT is LW Studio, a small, independent design led architectural practice working predominately in Herefordshire, Shropshire, Worcestershire and Powys, but also further afield. With over 30 years industry experience across a range of sectors, LW Studio has a broad client base from private individuals, developers, housing associations, commercial and educational clients, to charities and community groups. There is consistent emphasis on design, ecology, energy efficiency and buildability, whether on small scale yet often complex refurbishment schemes, or larger new build projects. Although able to provide a full service from inception to completion, every project will naturally vary in the level of architectural involvement. Regardless of scale or complexity, LW Studio works inclusively and collaboratively with clients and consultants to achieve personalised results.

Low Carbon Box

Market Harborough

Low Carbon Box are Sustainable Building Consultants working and partnering with clients, contractors and consultants to deliver low energy and sustainable building solutions. Our key services are: Passivhaus | SAP Calculations | SBEM | EPC | Thermal bridging Calculations | Overheating simulation | Daylight Analysis | Code for Sustainable Homes With a strong Architectural background supported by Building Physics, we understand how buildings go together and the performance expectations from our services and results.


Luft MVHR Ltd