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
2014 edition incorporating 2016 amendments
Approved Document L1B: Existing dwellings
2014 edition incorporating 2016 amendments
Approved Document L2A: New buildings other than dwellings
2014 edition incorporating 2016 amendments
Approved Document L2B: Existing buildings other than dwellings
2014 edition incorporating 2016 amendments
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
Zero Carbon Hub Guides
Zero Carbon Hub - Builders Book