The SIP France story
SIP France is led by bilingual architect Steven Downs, RIBA-trained in the UK and working as maître d’œuvre in France for over 20 years. While Structural Insulated Panels (SIPs) are widely adopted across Europe, Steven identified a clear gap in the French market for a specialist provider combining technical expertise, on-site experience, and education.
SIP France was founded to deliver high-performance SIP structures across France, alongside the knowledge and support needed to make this eco-friendly construction method accessible and reliable. With the introduction of RE2020, airtight SIP buildings have become one of the most effective ways for designers and contractors to achieve compliance with confidence.
Today, SIP France goes further - offering solar roofing and high-performance glazing solutions to help eco-conscious homebuilders create a fully optimised, energy-efficient building envelope through a single, coordinated approach. Through close partnerships with leading European manufacturers, we bring proven, innovative solutions to the French market.
We are proud to partner with SIP Europe, a leading SIP and timber-frame manufacturer based in Slovakia and committed to environmental excellence. Using advanced carbon-analysis software, each project is calculated to achieve a negative carbon footprint of between –12,000 and –30,000 kg of CO₂. Close collaboration between Steven, our architectural design team, SIP Europe engineers, and certified installation partners ensures every structure meets French regulations, optimises material use, and performs flawlessly in reality - not just on paper.
Partner with us
We are looking to partner with architects, developers and construction teams to provide SIP & timber frame structures, solar roofing and eco glazing solutions across France.
If that’s you, let’s chat.
ECSUS Design is a key SIP France partner, providing expert project management and delivery for builds in the Haute Savoie using SIP France products. As specialists in eco-friendly SIP construction in the French Alps, they manage projects end-to-end or support at key stages. Their bilingual team of architects and project managers ensures projects stay on time, on budget and to high standards, while integrating SIP systems for superior energy efficiency and AA ratings. ECSUS Design’s role bridges SIP France’s high-performance structural solutions with seamless project execution for clients and builders.
Our partners
Alpine / Atlantic Eco works closely with SIP France to help turn SIP systems into comfortable, energy-efficient homes. With hands-on experience designing and managing construction of homes in alpine and coastal environments, they know how to get the best out of SIP construction – from thermal performance and airtightness to layout and interiors. By coordinating design and technical elements, Alpine / Atlantic Eco helps ensure SIP France projects are well thought-through, practical to build and enjoyable to live in.
Alex Watton Construction 820 630 457
Alex Watton Construction is SIP France’s trusted installation partner in Haute-Savoie and a registered SIP Europe installer. Alex and his team are responsible for installing SIP France structures and our windows & doors and can also train other teams to work with the system. Alex brings his on-site experience into the design and engineering phase so projects are properly thought through before they reach site, ensuring a smooth transition from drawings to build.
Leman Solar is our go-to registered solar roof installer in Haute-Savoie. Their team of certified professionals handle everything from panel fitting to electrical connection and help optimise energy performance on site. Whether you’re aiming for self-consumption or full solar functionality, Leman Solar makes sure your solar roof delivers and works hand-in-hand with the rest of the build.
AgenceKo is a creative architecture studio with bases in Morzine and Annecy, specialising in smart, sustainable design. They’re skilled at adapting layouts and technical design to get the most out of SIP construction - from performance and buildability to aesthetics and comfort. By working closely with clients and SIP France from early stages, AgenceKo helps ensure projects are both beautiful and practical to build with SIP panels.
DO.TS is an architecture and interior design practice combining international experience with a strong working knowledge of SIP construction. The team gained practical experience with SIP systems in the United States before relocating to Megève to focus on high-quality alpine chalet projects. This background provides a clear understanding of SIP performance in challenging climates and complex sites. Today, based in the Alps, they merge this technical knowledge with local construction expertise to deliver efficient, robust, and thoughtfully finished chalets.