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

O N L I N E V E R S I O N Section 0: Introduction Summary 0.1 This approved document, Approved Document L, Volume 1: Dwellings, gives guidance on how to comply with Part L of Schedule 1 to the Building Regulations and the energy efficiency requirements for dwellings. For guidance relating to non-domestic buildings, use Approved Document L, Volume 2: Buildings other than dwellings. 0.2 This approved document contains the following sections: Approved document section Related Building Regulations requirements Section 0: Introduction n/a Section 1: Calculating the target primary energy rate, Regulations 24, 25, 25B, 26, 26A, 26C, 27, 27A and 27C target emission rate and target fabric energy efficiency rate Section 2: Calculating the dwelling primary energy rate, dwelling emission rate and dwelling fabric energy efficiency rate Section 3: Consideration of high-efficiency Regulation 25A alternative systems Section 4: Limiting heat gains and losses Requirement L1(a) of Schedule 1 Section 5: Minimum building services efficiencies Requirements L1(b)(i), (ii) and L2 of Schedule 1 and controls – general guidance Section 6: System specific guidance Section 7: Air permeability and pressure testing Regulation 43 Section 8: Commissioning Regulations 44 and 44ZA and requirements L1(b)(iii) and L2(b) of Schedule 1 Section 9: Providing information Regulations 40 and 40A Section 10: New elements in existing dwellings, Regulation 23(2) and requirement L1(a) of Schedule 1 including extensions Section 11: Work to elements in existing dwellings Regulations 6, 22 and 23(1) and requirement L1(a) of Schedule 1 Section 12: Consequential improvements Regulation 28 Appendix A: Key terms n/a Appendix B: Reporting evidence of compliance n/a Appendix C: Work to thermal elements n/a Appendix D: Specification for a home built with a n/a heat pump Appendix E: Standards referred to n/a Appendix F: Documents referred to n/a Building Regulations 2010 Approved Document L Volume 1, 2021 edition 1 O N L I N E V E R S I O N