Part L - Conservation of fuel and power

Approved Document L1B: Conservation of fuel and power in existing dwellings

Publication title: Approved Document L1B: conservation of fuel and power in existing dwellings, 2010 edition (incorporating 2010, 2011, 2013, 2016 and 2018 amendments)
Date published: April 2018
Date valid from: 5 April 2018

Summary

Approved Document L provides guidance on the conservation of fuel and power. 

It is split into four parts L2A covers existing dwellings.

Guidance provided includes insulation regulations, boiler productivity, lighting, and storage techniques for hot water. Further information covered includes fixed standards for Carbon Index ratings, solar emissions, heating and ventilation systems, space heating controls and air conditioning systems, amongst other fuel and power systems. 

These documents are updated regularly due to improvements in technologies and materials available in the construction and modification of buildings, so please ensure you are reading the most up to date copy of the document. 

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Approved Document L1B: conservation of fuel and power in existing dwellings, 2010 edition (incorporating 2010, 2011, 2013, 2016 and 2018 amendments) (PDF)

This is the current edition of Approved Document L1B (Conservation of fuel and power in existing dwellings) incorporating all previous amendments.

Changes in this version

This publication consolidates the 2010 edition of Approved Document L1B: Conservation of fuel and power in existing dwellings and subsequent amendments.

The 2010 edition (as amended) of Approved Document L1B came into effect on 1 October 2010.

The further set of amendments came into force on 6 April 2016, see details of these amendments

The latest set of amendments came into force on 5 April 2018, see details of these amendments.

This Approved Document gives guidance for compliance with the Building Regulations for building work carried out in England. It also applies to building work carried out on excepted energy buildings in Wales as defined in the Welsh Ministers (Transfer of Functions) (No. 2) Order 2009.