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

O N L I N E V E R S I O N R24-27C Regulations 24, 25, 25B, 26, 26A, 26C, 27, 27A and 27C: Energy performance of dwellings calculations This section deals with the requirements of regulations 24, 25, 25B, 26, 26A, 26C, 27, 27A and 27C of the Building Regulations 2010. Regulations Methodology of calculation of the energy performance 24. (1) The Secretary of State shall approve— (a) a methodology of calculation of the energy performance of buildings, including methods for calculating asset ratings and operational ratings of buildings; and (b) ways in which the energy performance of buildings, as calculated in accordance with the methodology, shall be expressed. (2) In this regulation— “ asset rating” means an energy performance indicator determined from the amount of energy estimated to meet the different needs associated with a standardised use of the building; and “ operational rating” means an energy performance indicator determined from the amount of energy consumed during the occupation of a building over a period of time and the energy demand associated with a typical use of the building over that period. Minimum energy performance requirements for new buildings 25. Minimum energy performance requirements shall be approved by the Secretary of State, calculated and expressed in accordance with the methodology approved pursuant to regulation 24, for— (a) new buildings (which shall include new dwellings), in the form of target CO emission rates; 2 (b) new dwellings, in the form of target fabric efficiency rates; and (c) new buildings in the form of target primary energy rates. Nearly zero-energy requirements for new buildings 25B. Where a building is erected, it must be a nearly zero-energy building. CO emission rates for new buildings 2 26. W here a building is erected, it shall not exceed the target CO emission rate for the building that has been 2 approved pursuant to regulation 25, applying the methodology of calculation and expression of the energy performance of buildings approved pursuant to regulation 24. Fabric energy efficiency rates for new dwellings 26A. Where a dwelling is erected, it shall not exceed the target fabric energy efficiency rate for the dwelling that has been approved pursuant to regulation 25, applying the methodology of calculation and expression of the energy performance of buildings approved pursuant to regulation 24. Target primary energy rates for new buildings 26C. W here a building is erected it must not exceed the target primary energy rate for the building which has been approved pursuant to regulation 25(c), applying the methodology of calculation and expression of the energy performance of buildings approved pursuant to regulation 24. 6 Approved Document L Volume 1, 2021 edition Building Regulations 2010 O N L I N E V E R S I O N