Conservation of fuel and power: Approved Document L, Volume 2 — Buildings other than dwellings

O N L I N E V E R S I O N Section 0: Introduction Summary 0.1 This approved document is Approved Document L, Volume 2: Buildings other than dwellings. It gives guidance on how to comply with Part L of Schedule 1 to the Building Regulations and the energy efficiency requirements for buildings other than dwellings. For guidance relating to domestic buildings, use Approved Document L, Volume 1: 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 and Regulations 24, 25, 25B, 26, 26C, 27 and 27C target emission rate Section 2: Calculating the building primary energy rate and building emission rate Section 3: Consideration of high-efficiency alternative Regulation 25A systems Section 4: Limiting heat gains and losses Requirement L1(a) of Schedule 1 Section 5: Minimum building services efficiencies and Requirements L1(b)(i), (ii) and L2 of Schedule 1 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 buildings, including Regulation 23(2) and requirement L1(a) of Schedule 1 extensions Section 11: Work to elements in existing buildings 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: Lighting Energy Numeric Indicator (LENI) n/a Appendix C: Reporting evidence of compliance n/a Appendix D: Measures for consequential improvements n/a Appendix E: Hierarchy for establishing seasonal n/a efficiencies of existing boilers Appendix F: Standards referred to n/a Appendix G: Documents referred to n/a 1 Building Regulations 2010 Approved Document L Volume 2, 2021 edition O N L I N E V E R S I O N