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Wales Part L: Conservation of fuel and power

Welcome to the Welsh Technical Guidance page for Part L of the building regulations.

This section contains the Approved Documents L1A and L1B for download below. They cover 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: New dwellings Approved Document L1B: Existing dwellings    
Approved Document L2A: New buildings other
than dwellings
Approved Document L2B: Existing buildings other
than dwellings

Additional Guidance:

Compliance Guide:

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 document: Air tightness testing

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

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:

Member Document: Guidance on U-Values of Elements

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

Zero Carbon Hub Guides:

Zero Carbon Hub - Builders Book

Zero Carbon Hub - SAP Untangled

Zero Carbon Hub - Services Guide