The requirement of Building Regulation part L is that reasonable
provision shall be made to limit heat loss through the
building fabric, hot water and hot air systems. In the case of
non residential buildings, provision must be made to limit solar
overheating and to provide energy efficient light systems.
To show compliance it is necessary to produce SAP (Standard
Assessment Procedure) energy ratings for buildings which can
be done in three ways:
an elemental method; a target U-value method and a carbon
index method.
The elemental method is suitable for small works and where it
is desired to minimise calculations. The requirement will be met
if the U-values of the elements do not exceed those listed
below and, in the case of dwellings, providing the area of windows,
doors and roof lights does not exceed 25% of the total
floor area.
In addition, the efficiency of the boiler in a dwelling must equal
or exceed the SEDBUK (Seasonal Efficiency of a Domestic Boiler
in the UK) ratings set out below. Note that the elemental
method cannot be used for buildings with direct electric heating.
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