Part L DocumentNew provisions and guidance are introduced to limit heat loss from a swimming pool basin where this is constructed as part of a new dwelling.

Swimming pool basins

3.33
Where a swimming pool is constructed as part of a new dwelling, reasonable provision should be made to limit heat loss from the pool basin by achieving a U-value no worse than 0.25 W/m2.K as calculated according to BS EN ISO 133706.

3.34
In terms of Criterion 1, the dwelling should be assessed as if the pool basin were not there, although the pool hall should be included. The area covered by the pool should be replaced with the equivalent area of floor with the same U-value as the pool surround.