Conservation of fuel and power: Approved Document L, Volume 1 — Dwellings

O N L I N E V E R S I O N Contents Introduction i What is an approved document? i How is construction regulated in England? i How do you comply with the Building Regulations? i What do the Building Regulations cover? ii When must a building control body be notified? ii How to use this approved document iii Where to get further help iv Section 0: Introduction 1 Summary 1 Application 2 Selected key interactions with other parts of the Building Regulations 4 Regulations 24, 25, 25B, 26, 26A, 26C, 27, 27A and 27C: Energy performance of dwellings calculations 6 Intention 8 Section 1: Calculating the target primary energy rate, target emission rate and target fabric energy efficiency rate 10 Buildings that contain multiple dwellings 11 District heat networks 11 Notional dwelling specification 11 Section 2: Calculating the dwelling primary energy rate, dwelling emission rate and dwelling fabric energy efficiency rate 13 Building control notification 13 Buildings that contain multiple dwellings 14 Special considerations when calculating the dwelling primary energy rate and dwelling emission rate 15 Internal lighting in the dwelling emission rate and dwelling primary energy rate calculations 17 Achieving the target primary energy rate, target emission rate and target fabric energy efficiency rate 17 Regulation 25A: Consideration of high-efficiency alternative systems 18 Intention 19 Building Regulations 2010 Approved Document L Volume 1, 2021 edition v O N L I N E V E R S I O N