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 Lighting 6.57 Any fixed lighting should achieve lighting levels appropriate to the activity in the space and spaces should not be over-illuminated. NOTE: In many cases, it is likely that householders will be able to choose the lamp installed in the individual space. 6.58 Where installed in a new or existing dwelling, each internal light fitting should have lamps with a minimum luminous efficacy of 75 light source lumens per circuit-watt. 6.59 Where installed in a new or existing dwelling, internal light fittings should have local controls to allow for the separate control of lighting in each space or zone. Controls may be manual, automatic or a combination of both. 6.60 Where installed in a new or existing dwelling, fixed external lighting should have both of the following controls. a. Automatic controls which switch luminaires off in response to daylight. b. If luminous efficacy is 75 light source lumens per circuit-watt or less, automatic controls which switch luminaires off after the area lit becomes unoccupied. If luminous efficacy is greater than 75 light source lumens per circuit-watt, manual control is acceptable. Building automation and control systems 6.61 Where a building automation and control system is installed, it should have appropriate control capabilities for the dwelling, based on the type of building, its expected use and potential energy savings. 6.62 The system should be specified and installed according to the manufacturer’s instructions to ensure that its overall performance meets a reasonable standard. 6.63 For large or complex buildings, the guidance in Approved Document L, Volume 2: Buildings other than dwellings should be followed. On-site electricity generation and storage 6.64 Where on-site electricity generation and storage is installed, such as photovoltaic panels or battery storage, systems should be an appropriate size for the site, available infrastructure and on-site energy demand. 6.65 The system should be specified and installed according to the manufacturer’s instructions to ensure that the overall performance of the system meets a reasonable standard. 6.66 When replacing an existing system, the installed generation capacity of the new system should be no less than that of the existing system, except where a smaller system can be demonstrated to be more appropriate or effective (e.g. replacing an existing system with one which is better matched to the dwelling’s energy demand). 6.67 On-site electricity generation should be provided with controls to allow proper operation of the system without the need for user intervention. This is particularly the case where electricity generation and storage systems are used, such as batteries. 50 Approved Document L Volume 1, 2021 edition Building Regulations 2010 O N L I N E V E R S I O N