Passivhaus Affiliate

Standard Members

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.


Lean Green Consulting

Fort William



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.


Lee Evans Elements


Lee Evans Elements is an environmental building consultancy specialising in low energy design, Passivhaus, and responsible retrofits. Our work ranges from whole house retrofits to new education buildings, where we can provide advice on planning and concept designs, detailing and energy consumption analysis. As Certified Passivhaus Designers, we can offer: • Design advice at all stages for low energy homes and buildings. • PHPP (Passivhaus Planning Package) calculations to calculate the predicted heat loss and energy demand. • Planning and Detail drawings with reduced and eliminated thermal bridging. • Thermal bridge analysis using THERM software. • Full architectural services for Passivhaus developments.

Link Treat Ltd


Martin 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.

Longboat Inn


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. Website:


Low Carbon Trust


Our main objective is tackling climate change through highlighting the connection between buildings, the people that use them, energy use and carbon emissions. We do this by running innovative low-carbon construction projects, green building courses and Eco Education Days for schools. We also offer a range of consultancy services including Passivhaus design.


Lukasran Construction Technologies Ltd