Part L - Conservation of fuel and power

As of 15 June 2022, the guidance will change due to The Building Regulations etc. (Amendment) (England) Regulations 2021¹ and the following two approved documents will be in force:

• Approved Document L, Conservation of fuel and power, Volume 1: Dwellings²
• Approved Document L, Conservation of fuel and power, Volume 2: Buildings other than dwellings³

These will replace the following four Approved Document L parts:

• Approved Document L1A: Conservation of fuel and power in new dwellings (2013 edition with 2016 amendments)⁴ (PDF) Came into force on 6 April 2016
• Approved Document L1B: conservation of fuel and power in existing dwellings, 2010 edition (incorporating 2010, 2011, 2013, 2016 and 2018 amendments)⁵ came into force on 5 April 2018
• Approved Document L2A: Conservation of fuel and power in new buildings other than dwellings (2013 edition with 2016 amendments⁶ (PDF) Came into force on 6 April 2016
• Approved Document L2B: Conservation of fuel and power in existing buildings other than dwellings, 2010 edition (incorporating 2010, 2011, 2013 and 2016 amendments)⁷ (PDF) Came into force on 6 April 2016

2016 amendments

• Approved Document L1B: Conservation of fuel and power in existing dwellings (2010 edition incorporating  2010, 2011, 2013 and 2016 amendments)⁸ 

2013 Building Services Compliance Guides

• Domestic Building Services Compliance Guide (2013 Edition)⁹ (PDF 540Kb)

2013 Edition 

• Approved Document L1A: Conservation of fuel and power in new dwellings (2013 edition)¹⁰ (PDF 1.74 MB)
• Approved Document L2A: Conservation of fuel and power in new buildings other than dwellings (2013 edition)¹¹(PDF 3.15 MB)

2013 amendments

• Approved Document L1B: Conservation of fuel and power in existing dwellings, 2010 edition (incorporating  2010, 2011 and 2013 amendments)¹² (PDF)
• Approved Document L2B: Conservation of fuel and power in existing buildings other than dwellings, 2010 edition (incorporating 2010, 2011 and 2013 amendments)¹³ (PDF)

For details of the amendments, see:

• Amendments to Approved Documents L1B and L2B 2010 editions¹⁴ (PDF 127 Kb)
• Amendments to various Approved Documents, including L1B and L2B 2010 editions¹⁵ (PDF 479 Kb)

2010 amendments

• Approved Document L1A: Conservation of fuel and power in new dwellings (2010 edition incorporating further 2010 amendments)¹⁶ (PDF 1.77 MB)
• Approved Document L1B: Conservation of fuel and power in existing dwellings, 2010 edition (incorporating further 2010 and 2011 amendments)¹⁷. (PDF 1.76 MB)
• Approved Document L2A: Conservation of fuel and power (New buildings other than dwellings) (2010 edition incorporating further 2010 amendments)¹⁸ (PDF 1.79 MB)
• Approved Document L2B: Conservation of fuel and power in existing buildings other than dwellings, 2010 edition (incorporating further 2010 and 2011 amendments)¹⁹ (PDF 1.76 MB)

2010 Editions

• Approved Document L1A: Conservation of fuel and power in new dwellings (2010 edition)²⁰ (PDF 516 Kb)
• Approved Document L1B: Conservation of fuel and power in existing dwellings (2010 edition)²¹ (PDF 497 Kb)
• Approved Document L2A: Conservation of fuel and power in new buildings other than dwellings (2010 edition²² (PDF 590 Kb)
• Approved Document L2B: Conservation of fuel and power in existing buildings other than dwellings (2010 edition)²³ (PDF 566 Kb)

Please note that these earlier 2010 editions do not incorporate the changes to regulation numbers resulting from the Building Regulations 2010 and Building (Approved Inspectors etc) Regulations 2010. An amendment slip was published which listed the changes:

• Amendments to Approved Documents and Compliance Guides 2010: List of revisions and corrections²⁴ (PDF 123 Kb)

2010 Building Services Compliance Guides

• Domestic Building Services Compliance Guide (2010 Edition as amended July 2011)²⁵ (PDF 1.8 MB)
• Non-Domestic Building Services Compliance Guide, 2010 Edition as amended July 2011)²⁶ (PDF 792 Kb)

2006 Editions

From 2006 there were four Part L Approved Documents:

• Approved Document L1A: Conservation of fuel and power in new dwellings (2006 edition)²⁷ (PDF 317 Kb)
• Approved Document L1B: Conservation of fuel and power in existing dwellings (2006 edition)²⁸ (PDF 299 Kb)
• Approved Document L2A: Conservation of fuel and power in new buildings other than dwellings (2006 edition)²⁹(PDF 322 Kb)
• Approved Document L2B: Conservation of fuel and power in existing buildings other than dwellings (2006 edition)³⁰ (PDF 315 Kb) 
• Amendment/correction of the 2006 Part L Approved Documents - March 2010³¹ (PDF 225 Kb).

2006 Building Services Compliance Guides

• Domestic Heating Compliance Guide (Second Edition - December 2008)³² (PDF 1130 Kb)
• Domestic Heating Compliance Guide (First Edition - May 2006)³³ (PDF 970 Kb)
• Domestic Heating Compliance Guide Corrigenda (December 2007)³⁴ (PDF 123 Kb) - This document lists corrections to the first edition of the Domestic Heating Compliance Guide.
• Non-Domestic Heating, Cooling and Ventilation Compliance Guide (May 2006)³⁵ (PDF 3526 Kb)

Interim 2005 Editions

• Approved Document L1A: Conservation of fuel and power in dwellings (2005 Interim Edition)³⁶ (PDF 104 Kb)
• Approved Document L1B: Conservation of fuel and power in existing dwellings (2005 Interim Edition)³⁷ (PDF 273 Kb)
• Approved Document L2A: Conservation of fuel and power in new buildings other than dwellings (2005 Interim Edition)³⁸ (PDF 919 Kb)
• Approved Document L2B: Work in existing buildings other than dwellings (2005 Interim Edition)³⁹ (PDF 304 Kb)

2002 Editions

From 2002 there were two Part L Approved Documents:

• Approved Document L1: Conservation of fuel and power in dwellings (2002 edition)⁴⁰ (PDF 736 Kb)
• Approved Document L2: Conservation of fuel and power in buildings other than dwellings (2002 edition)⁴¹ (cover) (PDF 31 Kb)
• Approved Document L2: Conservation of fuel and power in buildings other than dwellings (2002 edition)⁴² (main document) (PDF 375 Kb)
• September 2005 amendment to Approved Document L1: Conservation of fuel and power in dwellings (2002 edition)⁴³ (PDF 344 Kb)
• April 2005 amendment to Approved Document L1: Conservation of fuel and power in dwellings (2002 edition)⁴⁴(PDF 978 Kb).

1995 Edition

• Approved Document L: Conservation of fuel and power (1995 edition)⁴⁵ (PDF 7.3 MB).

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