Building Regulations and Standards - Energy

Part L of the Building Regulations for England and Wales, and Section 6 of the Scottish Standards set levels for building energy efficiency and carbon emissions.

What are the Building Regulations and Standards for energy efficiency in Great Britain?

The energy efficiency requirements for buildings are contained in Part L of the Building Regulations in England and Wales, and Section 6 (Energy) to the Building Standards in Scotland. The regulations are supported with guidance documents, known as the Approved Documents in England and Wales, and the Technical Handbooks in Scotland. The guidance documents explain how to actually reach compliance.

Significant updates have recently been introduced to the Building Regulations and Standards in England, Scotland and Wales. The links below will give you more information on the specific changes in the different countries.

Find out more about the Regulations / Standards

Page reviewed 3/2/2026

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England Part-L 2021 New Homes Article 4:3

Insulation Boards

Approved Document L - England

Find out more about the Building Regulations in England.

Coleg Cymunedol y Dderwen Close Case Study 4:3

Insulation Boards

Approved Document L - Wales

Find out more about Part L of the Building Regulations in Wales.

Insulation Boards

Section 6 (Energy) - Scotland

Find out more about Section 6 of the Building Standards in Scotland.

CPD training for Part L and Section 6

Our suite of CPD training presentations can be delivered in-person or virtually. CPDs are available for Part L England, Part L Wales and also Section 6 for Scotland, covering new and existing dwellings and buildings.

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U-value calculator

Try our free online U-value calculator to calculate the thickness of material needed to meet the new levels of thermal performance. With a number of roof, wall and floor constructions, the calculator is quick and easy to use.

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Building Regulations and Standards - Energy

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