At Passive Slab, we believe that energy efficiency starts from the ground up. Our advanced insulated foundation systems are engineered specifically for low-energy along with Passivhaus homes and other sustainable developments across the UK.
At Passive Slabs, we believe that energy efficiency starts from the ground up. Our advanced insulated foundation systems are engineered specifically for low-energy or Passivhaus homes and other sustainable developments across the UK.
Passive Slab delivers a complete foundation solution that combines cutting-edge insulation, structural strength, and simplified installation — helping homeowners, architects, and developers build better from the very beginning of their project.
At Passive Slab, we offer flexible options to suit your project. Whether you’re looking for a straightforward supply-only package, on-site assistance at key stages or prefer a fully installed foundation system managed by our experienced team — we’ve got you covered. Choose the level of support that works best for your project.
A Passive Slab is a high-performance, fully insulated foundation system designed to meet the strict energy standards of Passivhaus and low-energy builds. Using high-quality, high density interlocking insulation panels from Izodom along with an in-situ reinforced concrete slab, Passive Slab foundation forms an efficient base beneath the structure — dramatically reducing heat loss whilst eliminating thermal bridges at the critical slab to wall and slab to ground interfaces.
Whilst traditional foundations rely on trench excavation, concrete and sub-structure under-build prior to the ground floor slab being placed. Passive Slab provide a simpler, cleaner and faster approach to having the site ready for your super structure build to commence.
A Passive Slab is a high-performance, fully insulated foundation system designed to meet the strict energy standards of Passivhaus and low-energy builds. Using high-quality, high density interlocking insulation panels from Izodom along with an in-situ reinforced concrete slab, Passive Slab foundation forms an efficient base beneath the structure — dramatically reducing heat loss whilst eliminating thermal bridges at the critical slab to wall and slab to ground interfaces.
Whilst traditional foundations rely on trench excavation, concrete and sub-structure under-build prior to the ground floor slab being placed. Passive Slab provide a simpler, cleaner and faster approach to having the site ready for your super structure build to commence.
Our foundation achieves U-values from 0.09W/m2K to 0.14W/m2K (p/a ratio dependant) — significantly outperforming traditional foundation and building systems.
Our system completely isolates the building from the ground and removes any possibility of a thermal bridge at the critical slab to wall junction.
The Passive Slab system is designed for speed and simplicity. With pre-cut insulation connecting with tongue & groove and dovetail joints along with a step-by-step construction method, build time is reduced significantly. Less waste. Less hassle. Fewer delays.
Whether you’re a self-builder, architect, contractor or developer Passive Slab provides the foundation performance you need.
We use Izodom as the insulating formwork, filled with reinforced concrete. The result is a strong, durable foundation with exceptional load-bearing capacity. We are the exclusive UK partner for Izodom 2000 ICF construction products.
Looking to build your dream home to Passive standards? We’ll support you every step of the way.
We work closely with architects to ensure our system integrates smoothly with your design vision and performance goals.
Our system offers a practical, scalable foundation solution for developments of all sizes.
The building industry is changing — and expectations around energy performance, sustainability, and thermal comfort are rising fast. Passive Slab helps future-proof your project, ensuring it meets today’s demands and tomorrow’s standards.
