Willmott Dixon — Collida Living Show Home
Passivhaus Plus certified insulated raft foundation for a Net Zero Carbon in Operation show home.
Project Overview
Willmott Dixon, one of the UK's largest independent construction companies, selected ISOQUICK for the foundation of their Collida Living Show Home — a flagship project designed to demonstrate the future of sustainable housing.
The show home targets Passivhaus Plus certification and Net Zero Carbon in Operation, with an ambitious 70% MMC components target. The foundation needed to deliver exceptional thermal performance, eliminate cold bridging, and align with the project's rigorous sustainability credentials.
ISOQUICK's KIWA-certified insulated raft foundation system was specified to provide the thermal continuity and structural performance required at the critical wall-floor junction — the point where conventional foundations fail thermally.
The Challenge
Delivering a Passivhaus Plus certified foundation on a high-profile show home brings exacting requirements. The project demanded:
- Zero thermal bridging at the wall-floor junction to achieve Passivhaus Plus targets
- Net Zero Carbon in Operation — meaning every design decision had to minimise operational energy
- 70% MMC components — favouring factory-engineered, precision components over site-based construction
- Fast, predictable installation to maintain the programme on a live show home site
- Compatibility with modern methods of construction and a light gauge steel frame superstructure
The ISOQUICK Solution
ISOQUICK was specified because it is the only KIWA-certified insulated raft foundation system that eliminates cold bridging at the wall-floor junction as standard — meeting the Passivhaus thermal-bridge-free threshold of <0.01 W/mK.
For Willmott Dixon and Collida, this meant:
- Passivhaus-ready performance out of the box — no additional thermal bridge mitigation required at the foundation edge
- Factory-engineered precision — components arrive pre-cut and numbered, contributing directly to the 70% MMC components target
- Rapid installation — the foundation system is assembled and ready for concrete pour within hours, not days
- Zero site waste — pre-cut EPS components eliminate on-site cutting and material loss
- Offsite Hub verified — the ISOQUICK foundation was installed in less than a day and generated zero waste on site
Technical Performance
The ISOQUICK foundation system delivered the thermal and structural performance required for Passivhaus Plus certification on this flagship Willmott Dixon project.
System-build approach
Zero waste
Passivhaus target
On Site
Project Credentials
A flagship Willmott Dixon show home combining tier-one delivery, Passivhaus Plus targets, third-party foundation certification, and net-zero carbon ambition.
AmbitionNet Zero Carbon
Working on a Similar Project?
Whether you're delivering Passivhaus, net-zero, or simply want a better-performing foundation, ISOQUICK provides the thermal performance and programme certainty that tier-one contractors rely on.