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

O N L I N E V E R S I O N AA e. the building is used as a public building, where Seasonal coefficient of performance (SCOP) A previously it was not; measure of the efficiency of a heat pump over the designated heating season, measured using the f. the building is not a building described in procedures in BS EN 14825. classes 1 to 6 in Schedule 2, where previously it was; Seasonal energy efficiency ratio (SEER) The total amount of cooling energy provided by a single g. the building, which contains at least one cooling unit over a year, divided by the total energy dwelling, contains a greater or lesser number of input to that single cooling unit over the same year. dwellings than it did previously; Secondary circulation An assembly of water h. the building contains a room for residential fittings in which water circulates in supply pipes or purposes, where previously it did not; distributing pipes of hot water storage systems. i. the building, which contains at least one room Secondary heating A space heating appliance for residential purposes, contains a greater or system which operates separately from the or lesser number of such rooms than it did main heating system in the dwelling and does not previously; provide most of the heating in the dwelling – for j. the building is used as a shop, where it example, a decorative fuel-effect fire in a room previously was not; or which also contains radiators for a central heating k. the building is a building described in regulation system. 7(4)(a), where previously it was not. SEDBUK (Seasonal Efficiency of Domestic Boilers Primary circulation An assembly of water fittings in in the UK) The methodology for determining boiler which water circulates between a heat source and efficiency defined in the Standard Assessment a primary heat exchanger inside a hot water storage Procedure, Appendix D. vessel, including any space heating system. Simple payback The amount of time it will take Primary energy Energy, from renewable and non- to recover the initial investment through energy renewable sources, that has not undergone any savings, calculated by dividing the marginal conversion or transformation process. additional cost of implementing an energy efficiency measure by the value of the annual Renewable technology Technology that uses energy savings achieved by that measure, taking no renewable resources, which are naturally account of VAT. The following guidance should be replenished on a human timescale, to produce used. electricity. Resources include wind, wave, marine, hydro, biomass and solar. • The marginal additional cost is the additional cost (materials and labour) of incorporating, for Rooflight A glazed unit installed out of plane with example, additional insulation – not the whole the surface of the roof on a kerb or upstand. Also cost of the work. sometimes referred to as a skylight. • The cost of implementing the measure should Roof window A window installed in the same be based on prices current at the date when orientation as, and in plane with, the surrounding roof. the application is made to the building control *Room for residential purposes Defined in body and be confirmed in a report signed by a regulation 2(1) as a room, or a suite of rooms, suitably qualified person. which is not a dwelling-house or a flat and which • The annual energy savings should be estimated is used by one or more persons to live and sleep using the Standard Assessment Procedure. and includes a room in a hostel, an hotel, a boarding house, a hall of residence or a residential home, but does not include a room in a hospital, or other similar establishment, used for patient accommodation. BBuuiillddiinngg RReegguullaattiioonnss 22001100 AApppprroovveedd DDooccuummeenntt LL VVoolluummee 11,, 22002211 eeddiittiioonn 7755 O N L I N E V E R S I O N