We do more than just build.

A Better Way to Build

Trust us to create your dream bespoke eco chalet.

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Our Mission

Flexible project management

You stay in control while we deal with all the details. Our team of qualified bilingual architects, engineers, designers and project managers bring in projects on time, on budget and to the highest standards.

Let's work together
Shows the luxurious interior of Chalet Balmat, our bespoke eco chalet
Forest full of trees


Sustainable chalets for you & the planet

French environmental regulations RE2020 are gradually coming into force, requiring carbon impact assessment and life cycle analysis of new builds. Our bespoke eco chalets already surpass government standards and achieve AA ratings for energy and emissions, resulting in significant savings on future household heating bills.


A team you can trust

As a fully decennale-insured Maitrise d’Oeuvre office with decades of experience, you can trust us to bring your eco alpine dream to life. We carefully think through every detail and our client-access online project management system is transparent and thorough.

Why Ecsus
Interior of Chalet Le Praz, bespoke eco chalet cleverly with an open plan living space on the top floor to make the most of the views.
Chalet Balmat exterior shot showing impressive hybrid ‘post & beam’ and SIP panel structure using beautiful baked and aged larch structural timbers and cladding. Semi-detached chalet is built in traditional style with slate roof, exposed larch timbers and local stonewall basement.


France’s leading SIP specialists

We’ve been building eco chalets in France for over 20 years. Our reputation, local contacts and competitive tendering process mean we achieve great value for clients - in many cases saving more money than we charge.

A Better Way To Build

What are structural insulated panels (SIPS)?

High performance rigid pre-fabricated construction panels, precision-engineered with almost limitless design capabilities, to create a structure much stronger than traditional timber frame. The SIP system has a negative carbon footprint due to the manufacturing process and recyclable materials. The panels create a fully airtight structure which is highly insulated with minimal heat loss. This allows us to control indoor air quality using mechanical ventilation and heat recovery systems, and engineer a building that’s healthier to live in.

Interior shot of the beautiful bathroom in chalet balmat

“We call ourselves very lucky to have found ECSUS to assist us with the new build. Very professional attitude, excellent communication and organising skills, always willing to think with you and find solutions if required.”

Luc Biesbroeck, Chalet 39


Eco Chalets Save €48,000 Per Year On Energy Bills

With energy bills skyrocketing it’s now more important than ever to keep useage low to minimise impact on your wallet as well as the environment. So the news that ECSUS Design’s SIP eco chalets saved clients €48,000 on annual heating bills in 2023, while using just a third of the energy consumed by the average…


Join us on our mission to create high quality, low environmental impact homes in the beautiful surroundings of the Haute Savoie. Together we can make your eco ski chalet dream come to life.