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

O N L I N E V E R S I O N R25A Section 3: Consideration of high-efficiency alternative systems 3.1 Before building work starts on a new dwelling, the person undertaking the building work must analyse the technical, environmental and economic feasibility of using high-efficiency alternative systems in the dwelling design. This analysis should be considered when designing the dwelling. 3.2 The building control body should be notified that the analysis of high-efficiency alternative systems has been undertaken, that it is documented and is available to be verified. The document should state whether high-efficiency alternative systems have been included in the dwelling design. The documented results of the analysis should be retained for the building control body to inspect upon request. 3.3 The analysis may be made for individual dwellings, groups of similar dwellings, or for common types of dwellings in the same area. Where a number of dwellings are connected to a district heat network or community heating system, a single analysis may be made for all dwellings connected to the network or system. 3.4 When a dwelling undergoes a major renovation, the technical, environmental and economic feasibility of installing high-efficiency alternative systems should be considered. 20 Approved Document L Volume 1, 2021 edition Building Regulations 2010 O N L I N E V E R S I O N