Passivhaus Affiliate

Standard Members

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.



Over 50 years of experience has taken Lendlease across the globe from Australia to Asia, Europe and the Americas. We employ more than 12,400 people around the world and manage an extensive portfolio of assets. We are proud to say that over a million people around the world live, work, shop or are connected through an asset we have created, every single day. Our clients, partners and investors can choose to leverage our strengths and local expertise at any stage of the property and infrastructure spectrum from development, investment management, project management & construction, and asset & property management or partner with us right through the complete journey.


Les Morrison Architects


Living Logic


Certified Passivhaus designers and consultants with specialist knowledge in sustainable building design, energy efficiency and renewable energy technologies. Plus with our in-house LED lighting and design company Liht, Living Logic offer a whole package of solutions bespoke to each individual building. Whether new build or refurbishment, domestic or non-domestic, Living Logic work with individuals and organisations wanting to live in a low energy world, promoting the development of low and zero carbon buildings that enhance our lives physically, environmentally, economically and socially.


Locate Architects


Locate Architects was set up in January 2004 by Chris Morgan, formerly a Project Architect with Gaia Architects. We offer a range of services but specialise in sustainable development and ecological design. Building on certification in Building Biology (buildings and health) and Permaculture, Chris is a certified Passivhaus designer and a member of the International Passivhaus Association and its UK partner, the Passivhaus Trust. With four passivhaus projects on the books, Locate are looking to add (certified) passivhaus design to a wide range of existing expertise in ultra low energy, healthy and ecological design. We work closely with Passivhaus Associates (see below) in Scotland, and with Warm Associates (see below also) as certifiers to provide a complete passivhaus design package in Scotland and the North of England.


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