Energy efficiency—Part L of the Building Regulations
Energy efficiency—Part L of the Building Regulations

The following Environment guidance note provides comprehensive and up to date legal information covering:

  • Energy efficiency—Part L of the Building Regulations
  • Legislative background
  • What is Part L of the building regulations?
  • Use of software
  • Eligibility and exemption
  • Key changes
  • Zero-carbon policy
  • Future developments

Updated in partnership with WSP

Legislative background

The Building Regulations 2010 (Building Regulations 2010), SI 2010/2214 set out the basis of legislation for building work in the UK. Most building work (including new constructions and modifications to existing buildings) are therefore subject to building regulations approval which can be gained through a local council or an approved inspector.

Relevant legislation includes:

  1. Building Act 1984

  2. Building Regulations 2010, SI 2010/2214

  3. Building (Approved Inspectors etc) Regulations 2010, SI 2010/2215

  4. Building (Scotland) Act 2003

The Building Regulations Approved Documents (ADs) are essentially the instruments that ensure policies set out in legislation are being carried out, providing practical guidance on ways of complying. They cover 15 separate sections (Parts A to R) stating the relevant legislation using extracts from the Building Regulations 2010, SI 2010/2214 and giving examples of how a development may deem to satisfy the provisions detailed.

There have been a number of changes in both the Building Act 1984 and the relevant building regulations since their original inception to amend and extend their scope.

What is Part L of the building regulations?

Part L covers the conservation of fuel and power (energy efficiency) in buildings.

In England and Wales, it is set out in the Building Regulations 2010, Sch 1, Part L. Paragraph L1 states that:

'reasonable provision shall be made for the conservation of