Approved Document L1B - Conservation of fuel and power in existing dwellings
This document covers the use of fuel and power within existing dwellings, which also includes extensions and renovations. U-value standards for walls, floors, roofs, windows, doors and rooflights are shown. The document also covers fittings and services, such as windows, doors, heating and hot water systems, and lighting.
Approved Document L1B
PDF file: 6.84MB, 32 pages
2013 edition incorporating 2010, 2011, 2013, 2016 and 2018 amendments: Valid from 5 April 2018
Quick links
The requirements in this edition of Approved Document L1B are as follows:
L1 - Conservation of fuel and power
Reasonable provision shall be made for the conservation of fuel and power in buildings by:
(a) limiting heat gains and losses:
(i) through thermal elements and other parts of the building fabric; and
(ii) from pipes, ducts and vessels used for space heating, space cooling and hot water services;
(b) providing fixed building services which:
(i) are energy efficient;
(ii) have effective controls; and
(iii) are commissioned by testing and adjusting as necessary to ensure they use no more fuel and power than is reasonable in the circumstances; and
Regulation 40 providing to the owner sufficient information about the building, the fixed building services and their maintenance requirements so that the building can be operated in such a manner as to use no more fuel and power than is reasonable in the circumstances.
Limits on application
None
Archived copies of Approved Document L1B
Approved Document L1B - 2013 edition incorporating 2010, 2011, 2013 and 2016 amendments
PDF file: 260KB, 31 pages
Valid from 6 April 2016 until 5 April 2018
The requirement in this edition was:
L1B - Conservation of fuel and power in existing buildings
Approved Document L1B - 2010 edition incorporating 2010, 2011 and 2013 amendments
PDF file: 306KB, 33 pages
Valid from 6 April 2014 until 6 April 2016
The requirement in this edition was:
L1B - Conservation of fuel and power in existing buildings
Approved Document L1B - 2010 edition incorporating further 2010 and 2011 amendments
PDF file: 318KB, 31 pages
Valid from 1 October 2010 until 6 April 2014
The requirement in this edition was:
L1B - Conservation of fuel and power in existing buildings
Approved Document L1B - 2010 edition
PDF file: 493KB, 34 pages
Valid from 1 October 2010
The requirement in this edition was:
L1B - Conservation of fuel and power in existing buildings
Approved Document L - List of revisions and corrections
PDF file: 318KB, 25 pages
Valid from March 2010 until 1 October 2010
Approved Document L1B - 2006 edition
PDF file: 318KB, 39 pages
Valid from 6 April 2006 until 1 October 2010
The requirement in this edition was:
L1B - Conservation of fuel and power in existing buildings
Approved Document L1 - 2002 edition
PDF file: 393KB, 59 pages
Valid from 1 April 2002 until 6 April 2006
The requirements in this edition were:
L1 - Conservation of fuel and power
Approved Document L - 1995 edition
No download currently available
Valid from 1 July 1995 until 1 April 2002
The requirement in this edition was:
L1 - Conservation of fuel and power
Approved Document L - 1990 edition with 1992 amendments
PDF file: 4.64MB, 25 pages
Valid from 1992 until 1 July 1995
The requirement in this edition was:
L1 - Conservation of fuel and power
Approved Document L - 1990 edition
No download currently available
Valid from 1 April 1990 until 30 June 1995
The requirement in this edition was:
L1 - Conservation of fuel and power
Approved Document L - 1985 edition
No download currently available
Valid from 11 November 1985 until 1 April 1990
The requirement in this edition was:
L2 & 3 - Resistance to the passage of heat
L4 - Heating system controls
L5 - Insulation of heating services
Quick links to other Approved Documents
The regulations cover all aspects of construction and are constantly reviewed. The guidance documents referred to as 'Approved Documents' contain practical ways and explanations of how to comply with the functional requirements of the Building Regulations.
These 'Approved Documents' are separated into 20 parts:
- Part A - Structure
- Part B (Volume 1) - Fire safety (Dwellings)
- Part B (Volume 2) - Fire safety (Buildings other than dwellings)
- Part C - Site preparation and resistance to contaminants and moisture
- Part D - Toxic substances
- Part E - Resistance to the passage of sound
- Part F - Ventilation
- Part G - Hygiene
- Part H - Drainage and waste disposal
- Part J - Combustion appliances and fuel storage systems
- Part K - Protection from falling, collision and impact
- Part L1A - Conservation of fuel and power in new dwellings
- Part L1B - Conservation of fuel and power in existing dwellings
- Part L2A - Conservation of fuel and power in new buildings other than dwellings
- Part L2B - Conservation of fuel and power in existing buildings other than dwellings
- Part M (Volume 1) - Access to and use of buildings (Dwellings)
- Part M (Volume 2) - Access to and use of buildings (Buildings other than dwellings)
- Part P - Electrical safety - Dwellings
- Part Q - Security - Dwellings
- Part R - Physical infrastructure for high-speed electronic communications networks
- Regulation 7 - Materials and workmanship