Are SIPs suitable for low-energy builds?

Yes. The Stotfold Crest Stables self-build project demonstrates the real-world performance of a SIP superstructure in a low-energy home.

Set within coastal exposure to the North Sea, the brief required exceptional thermal performance and year-round comfort.

The home’s 172 mm SIP panels achieve a U-value of 0.15 W/m²K with no additional insulation.

Now fully occupied, the property provides a full year of post-occupancy data:

Zero heating bills: The combination of SIP fabric, Ground Source Heat Pump (GSHP) and Solar PV results in a home that exports around £900 per quarter in energy credit.
Year-round comfort: Internal temperature variation of less than 1.5°C between seasons, achieved with no mechanical cooling.
Acoustics: Internal sound levels averaging under 30 dB despite proximity to a working yard and the A19.
Maintenance: After a year of coastal exposure — zero fabric issues.

The project demonstrates a fabric-first approach, with a SIP envelope already exceeding the 2025 Future Homes Standard.

Real-world performance data shows low running costs, airtight comfort and stable internal conditions throughout harsh North East winters.

Yes. A live SIP self-build achieved a U-value of 0.15 W/m²K with no additional insulation and now records zero heating bills with stable year-round comfort.