Approved Document L: Conservation of fuel and power - Volume 1: Dwellings (2021 edition)

This Approved Document provides guidance on how to comply with Part L to Schedule 1 of the Building Regulations covering the conservation of fuel and power and the associated energy efficiency requirements for dwellings, and takes effect on 15 June 2022. It does not apply to work subject to a building notice, full plans application or initial notice submitted before that date, provided the work is started on site before 15 June 2023. ADL1: Conservation of fuel and power - Dwellings (2021 edition) contains the following sections: Calculating the target primary energy rate, target emission rate and target fabric energy efficiency rateCalculating the dwelling primary energy rate, dwelling emission rate and dwelling fabric energy efficiency rateConsideration of high efficiency alternative systemsLimiting heat gains and lossesMinimum building services efficiencies and controls - general guidanceSystem specific guidanceAir permeability and pressure testingCommissioningProviding informationNew elements in existing dwellings, including extensionsWork to elements in existing dwellingsConsequential improvementsKey termsReporting evidence of complianceWork to thermal elementsThe guidance in this Approved Document only relates to England and applies to dwellings only.

In a mixed-use building, Approved Document L, Volume 2: Buildings other than dwellings should be consulted for building work in parts of the building that are not dwellings.