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Insulation Installation Certificate

An Insulation Installation Certificate confirms that thermal insulation (cavity wall, loft, external wall, floor, or roof) has been installed in compliance with Building Regulations Part L and the relevant British Standards. It records the insulation type, thickness, U-value achieved, and pre-installation checks.

Building Regulations Part L, PAS 2030/2035, BS EN ISO 6946 (U-value calculation)Valid: One-off (guarantee period varies by installer)

What it covers

  • Insulation type and material
  • Manufacturer and BBA/KIWA certification
  • Thickness and U-value achieved
  • Pre-installation survey and damp checks
  • Installation compliance with Building Regulations
  • Guarantee period and terms

Who needs a Insulation Cert?

Homeowners
Building contractors
ECO scheme participants
Building control

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Frequently asked questions about Insulation Cert

Do I need Building Regulations approval for insulation?
Yes, in most cases. Loft insulation, cavity wall insulation, and external/internal wall insulation are notifiable work under Building Regulations Part L. PAS 2030/2035 compliance is required for government-funded schemes (ECO, LA Flex).
What U-value should insulation achieve?
The target U-value depends on the element: walls should aim for 0.30 W/m²K or better, loft insulation (270mm mineral wool) achieves approximately 0.16 W/m²K, and floor insulation targets 0.25 W/m²K. Building Regulations Part L sets the minimum standards.

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