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Building Regulations and Standards

Building Regulations simplified

Building Regulations / Standards set the levels of thermal insulation required when carrying out building work, either for new build or refurbishment projects. These are expressed as a U-value which needs to be achieved. The required U-value will depend on the location of the project (England, Scotland or Wales), type of building (domestic or non-domestic) and the application (floor, wall or roof).

The tables below show the suggested U-values in England, Wales and Scotland. Note the distinction between the domestic and non-domestic columns. Below that, there are more detailed guides to the thermal insulation parts of Building Regulations / Standards.

England

  Domestic Non-domestic
New Build Existing Buildings New Build Existing Buildings
Best Starting Point (Fabric Only) Extension Refurbishment Best Starting Point (Fabric Only) Extension Refurbishment
Wall 0.16 0.28 0.30 / 0.55 * 0.22 0.28 0.30 / 0.55 *
Floor 0.11 0.22 0.25 0.18 0.22 0.25
Pitched Roof - Ceiling Level 0.11 0.16 0.16 0.14 0.16 0.16
Pitched Roof - Rafter Level 0.11 0.18 0.18 0.14 0.18 0.18
Flat Roof 0.11 0.18 0.18 0.14 0.18 0.18
* A U-value of 0.55 W/m²·K is used for cavity insulation and 0.30 W/m²·K for internal or external wall insulation.

ADL1A 2013 Building Regulations: England - New dwellings

ADL1B 2013 Building Regulations: England - Existing dwellings

ADL2A 2013 Building Regulations: England - New buildings

ADL2B 2013 Building Regulations: England - Existing buildings

Wales

  Domestic Non-domestic
New Build Existing Buildings New Build Existing Buildings
Best Starting Point (Fabric Only) Extension Refurbishment Best Starting Point (Fabric Only) Extension (Domestic in Character) Extension (Other Buildings) Refurbishment
Wall 0.16 0.21 0.30 / 0.55 * 0.22 0.21 0.26 0.30 / 0.55 *
Floor 0.11 0.18 0.25 0.18 0.18 0.22 0.25
Pitched Roof - Ceiling Level 0.11 0.15 0.16 0.14 0.15 0.15 0.16
Pitched Roof - Rafter Level 0.11 0.15 0.18 0.14 0.15 0.18 0.18
Flat Roof 0.11 0.15 0.18 0.14 0.15 0.18 0.18
* A U-value of 0.55 W/m²·K is used for cavity insulation and 0.30 W/m²·K for internal or external wall insulation.

ADL1A 2014 Building Regulations: Wales - New dwellings

ADL1B 2014 Building Regulations: Wales - Existing dwellings

ADL2A 2014 Building Regulations: Wales - New buildings

ADL2B 2014 Building Regulations: Wales - Existing buildings

Scotland

  Domestic Non-domestic
New Build Existing Buildings New Build Existing Buildings
Best Starting Point (Fabric Only) Extension & Refurbishment * Conversion of Heated Buildings Best Starting Point (Fabric Only) Refurbishment, Extension & Conversion of Unheated Buildings Conversion of Heated Buildings
A B
Wall 0.15 0.17 0.22 0.30 0.18 0.25 0.30
Floor 0.13 0.15 0.18 0.25 0.15 0.20 0.25
Pitched Roof - Ceiling Level 0.10 0.11 0.15 0.25 0.14 0.15 0.25
Pitched Roof - Rafter Level 0.10 0.13 0.18 0.25 0.14 0.15 0.25
Flat Roof 0.10 0.13 0.18 0.25 0.14 0.15 0.25
* Column A is for extensions where the existing dwelling's walls and roof U-values are worse than 0.70 W/m²·K in the walls and worse than 0.25 W/m²·K in the ceiling. Column B is for other extensions, upgraded existing thermal elements, non-exempt conservatories and conversion of unheated buildings.

Section 6 Building Standards: Scotland - Domestic buildings

Section 6 Building Standards: Scotland - Non-domestic buildings

Jersey

Part 11 Building Regulations: Jersey

Kingspan Insulation Ltd

For queries relating to insulation boards, cavity closers or membranes.

Pembridge

Leominster

Herefordshire

HR6 9LA

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