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

O N L I N E V E R S I O N R24-27C 2.17 For modular or portable buildings of the type described in paragraph 2.16, a target primary energy rate and building primary energy rate calculation and target emission rate and building emission rate calculation should be carried out when the portable building or its modular components are first constructed. The calculation can be based on a standard generic configuration of modules. Whenever the building is moved to a new location, in which its intended time of use is less than two years, these calculations can be provided as evidence that the energy efficiency requirements are met. The supplier should provide all the following in writing. a. Details of the calculation. b. Confirmation that the modules as provided meet or exceed the elemental energy standards of the generic module on which the calculation was based. c. Confirmation that the activities assumed in the generic module are reasonably representative of the planned use of the actual module. 2.18 If the planned time of use of a modular or portable building in a single location is less than two years, the only practical heating technology may be electric resistance heating. In such cases, the notional building will use electric resistance heating. 2.19 If more than 70% of the external envelope of this type of building will be created from sub- assemblies manufactured before the date when this approved document came into force, the target primary energy rate and target emission rate should be multiplied by the relevant factors from Table 2.3. NOTE: One way of demonstrating the date of manufacture of each sub-assembly is by relating the serial number to the manufacturer’s records. Table 2.3 T arget emission rate multiplying factor for modular and portable buildings with a planned service life of more than two years but intended time of use at a single location of less than two years Date of manufacture of 70% of modules Target primary energy rate Target emission rate making up the external envelope multiplying factor multiplying factor After the coming into force date 1.00 1.00 6 April 2014 – coming into force date 1.30 1.30 1 Oct 2010 – 5 April 2014 1.40 1.40 6 April 2006 – 30 Sept 2010 1.67 1.67 Pre 6 April 2006 2.03 2.03 Swimming pool basins 2.20 When calculating the building primary energy rate and building emission rate for a building with a swimming pool, the thermal performance of the pool basin should not be included in the calculation. Instead, the building primary energy rate and building emission rate should be calculated as if the area covered by the pool were replaced with the equivalent area of floor with the same U-value as the pool surround. 15 Building Regulations 2010 Approved Document L Volume 2, 2021 edition O N L I N E V E R S I O N