Four approved HM Government PDF documents contain all Part L Building Regulation information, including the recent changes to L1A, L1B, L2A and L2B - the conservation of fuel and power in both existing and new dwellings and buildings other than dwellings:

These approved HM Government PDF documents are entitled:
- 'Conservation of fuel and power - L1A', which is all about the conservation of fuel and power in new dwellings
- 'Conservation of fuel and power - L1B', which is all about the conservation of fuel and power in existing dwellings
- 'Conservation of fuel and power - L2A', which is all about the conservation of fuel and power in new buildings other than dwellings
- 'Conservation of fuel and power - L2B', which is all about the conservation of fuel and power in existing buildings other than dwellings.
In these, all references to the Building Regulations 2000 (as amended) should be read as references to the Building Regulations 2010. In addition, all references to the Building (Approved Inspectors) Regulations 2000 should be read as references to the Building (Approved Inspectors) Regulations 2010.
Documents L1A and L2A cover the following: Introduction; Requirements; General guidance; Design standards; Quality of construction and commissioning; Providing information; Model designs; Reporting evidence of compliance; plus Appendices and Index.
Documents L1B and L2B cover the following: Introduction; Requirements; General guidance; Guidance related to building work; Guidance on thermal elements; Consequential improvements to energy performance; Providing information; Work to thermal elements; Appendices and Index.
To see the full document, click on: www.voltimum.co.uk/news/15281/consult.experts_hottopics.RegLegAndDir.PartsL/conservation-of-fuel-and-power-in-buildings.html - then click on the individual links for Parts L1A, L1B, L2A and L2B.