Passivhaus Affiliate

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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 Rhodes


With a passion for sustainable building design, Laura is enjoying applying her skills and knowledge to her role as Sustainability Engineer at Staffordshire University. As a Certified European Passivhaus Consultant and Retrofit Coordinator, she is committed to driving forward Passivhaus and EnerPHit projects.

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

We are a multidisciplinary worker owned co-operative of engineers and architects committed to creating sustainable, environmentally friendly buildings. We use our wide experience to make your plans practical and usable. We specialise in healthy and comfortable buildings with net zero operational energy and strive for low carbon emissions across their lifetime. We are proud to offer a fully-coordinated building design including thermal modelling and Passive House design. Our Passive House consultants and low carbon construction and building services specialists work collaboratively with architects and clients to develop designs for net zero and Passive House buildings. Our designs include all aspects of residential and non-residential building services including renewables, heat supply and distribution, water, electrical, fire detection, data services, lighting, security and access controls. We can also provide architectural design and detailing if required.


Levitt Bernstein



LEVO Design Ltd







Lindab is a leading ventilation company, offering solutions for energy-efficient ventilation for a wide range of applications including Passivhaus MVHR systems. The products are characterised by high quality, ease of installation and environmental thinking. Lindab also offers a range of sustainable roof and rainwater systems. Most of us spend the majority of our time indoors. Lindab wants to contribute to a better indoor climate for tomorrow. We also want to contribute to a better climate for our planet.


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.

Liv Architects



LJR+H Architects



Loader Monteith Architects



Locke Passive House Consultants

Stoke Bruerne

Founded by Certified Passive House Consultant Robert Locke, we support our clients, architects and designers to create a holistic plan for both new-build Passive House buildings and retrofitting existing homes to EnerPHit criteria. Drawing upon a decade of experience in renovating and retrofitting existing character properties and new-build infill development, we can ensure that your home is fit for a net-zero future, whilst retaining the characteristics that make it unique.


Loreburn Housing Association


Loreburn Housing Association is an award winning registered social landlord with over 2,500 homes across Dumfries and Galloway. Our vision and purpose is to ‘Create GREAT places to live’, by improving housing and opportunities and building strong and sustainable communities throughout our region. With a growth mindset, we’re always looking to the future to find new, better, greener and more cost-effective ways of working and to provide low cost in use homes that bring improved health and wellbeing outcomes. Our corporate strategy 2019 - 2024 gives a commitment to supporting the ambition of a carbon neutral Scotland by 2040. We’ll do this with innovative build solutions, including building new homes to Passivhaus standards across our future development programme. We delivered our first, fully certified, Passivhaus development in March 2021.


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



Luths Services


Lùths Services are an independent building services engineering consultancy who specialise in low energy and renewables from design through to implementation. We work closely with architects, builders and clients to give clear, impartial and actionable advice at every stage of your project. Based in Glasgow we work over the UK and have over 18 years experience in renewable and low carbon projects.