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

R23(2), LO1N(aL I)N E V E R S I O N Regulation 23(2) and requirement L1(a): Replacement of thermal elements and limiting heat gains and losses This section deals with the requirements of regulation 23(2) and Part L1(a) of Schedule 1 to the Building Regulations 2010. Regulation Requirements for the renovation or replacement of thermal elements 23. (2) W here the whole or any part of an individual thermal element is proposed to be replaced and the replacement— (a) constitutes a major renovation; or (b) ( in the case of part replacement) amounts to the replacement of more than 50% of the thermal element’s surface area; t he whole of the thermal element must be replaced so as to ensure that it complies with paragraph L1(a)(i) of Schedule 1, in so far as that is technically, functionally and economically feasible. Requirement Requirement Limits on application Schedule 1 – Part L Conservation of fuel and power L1. Reasonable provision shall be made for the conservation of fuel and power in buildings by: (a) limiting heat gains and losses— (i) t hrough thermal elements and other parts of the building fabric; and (ii) f rom pipes, ducts and vessels used for space heating, space cooling and hot water services; (b) providing fixed building services which— (i) are energy efficient to a reasonable standard; (ii) have effective controls; and (iii) are commissioned by testing and adjusting as necessary to ensure they use no more fuel and power than is reasonable in the circumstances. 68 Approved Document L Volume 2, 2021 edition Building Regulations 2010 O N L I N E V E R S I O N