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

O N L I N E V E R S I O N L1(b), L2 Intention In the Secretary of State’s view, requirements L1(b)(i), (ii) and L2 are met in a new dwelling by achieving all of the following. a. Fixed building services that both: i. meet the minimum efficiencies in Section 6 ii. are appropriately sized, following paragraphs 5.8, 5.9 and 5.11 to 5.13 b. Controls to fixed building services are provided that both: i. meet the general controls for heating and hot water systems in paragraphs 5.14 to 5.22 ii. meet the system specific controls in Section 6. c. Any on-site electricity generation is both appropriately sized and has controls. In the Secretary of State’s view, requirements L1(b)(i), (ii) and L2 are met in an existing dwelling by achieving all of the following. a. Fixed building services that both: i. meet the minimum efficiencies in Section 6 and the criteria in paragraphs 5.4 and 5.5 ii. are appropriately sized, following paragraphs 5.8 to 5.13. b. Any fixed building services installed have controls that both: i. meet the standards for general controls for heating and hot water systems in paragraphs 5.14 to 5.27 ii. meet the standards for system specific controls in Section 6. c. Any on-site electricity generation provided is both appropriately sized, following paragraph 5.6, and has controls. 34 Approved Document L Volume 1, 2021 edition Building Regulations 2010 O N L I N E V E R S I O N