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Building Regulations Part L1A, L1B, L2A and L2B: Conservation of fuel and power

Welcome to the technical guidance page for Part L of the Building Regulations.

This section contains the approved documents for download below. This suite of documents covers new dwellings (document L1A), work to existing dwellings (L1B), new buildings other than dwellings (L2A), and works to existing buildings other than dwellings (L2B).

There are two additional compliance guides for building services, and additional guidance below.

Approved Document L1A: Conservation of fuel and power in new dwellings Approved Document L1B: Conservation of fuel and power in existing dwellings
Approved Document L2A: Conservation of fuel and power in new buildings other than dwellings Approved Document L2B: Conservation of fuel and power in existing buildings other than dwellings

Additional Guidance:

Compliance Guidance:

Domestic Building Services Compliance Guide 2013 edition

Non-Domestic Building Services Compliance Guide 2013 edition

BCA Guidance:

BCA Technical Guidance Note 6: Use of multi-foil insulation products and compliance with Regulation 7 and Building Regulation Requirement L1

BCA Technical Guidance Note 12: Cavity Separating Wall Guidance for Part L 2010

LABC Technical Guidance:

Technical guide: Guidance on application of Part L to conservatories attached to existing dwellings

Technical document: Air tightness testing

Technical Guide: Viewpoint - Energy conservation in historic and traditional buildings

Technical guide: Guide to retrofitting solar panels

Technical Guide: Viewpoint - Householder guide to re-roofing conservatories and porches

Technical Guide: Guidance on adding solid roofs to conservatories or porches attached to dwellings

LABC Member Document:

LABC Member Document: Guidance on Fixing solar panels To Timber Rafter & Battens (Pitched Roofs) NFRC

Member Document: Guidance on U-Values of Elements

Zero Carbon Hub Guides:

Zero Carbon Hub - Builders Book

Zero Carbon Hub - SAP Untangled

Zero Carbon Hub - Services Guide