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The Greater London Authority (GLA) has clarified that the move to a 40% CO2 reduction over Building Regulations Part L 2010 (London Plan Policy 5.2) came into effect from the 1 October 2013. This applies to both residential and non-residential development. The GLA is seeking this reduction on all referable schemes submitted after this date, and they encourage London Boroughs to also apply this for major applications.

To meet this reduction as cost effectively as possible it is important to seek early design advice, as critical factors (such as roof space for photovoltaic panels, minimising heat loss areas, community heating strategies and balancing solar gain and overheating risk) become even more crucial.

Our experience so far is that the GLA is enforcing this requirement, although they have demonstrated flexibility as to how this may be best achieved. As before, an energy statement must be submitted with all major developments outlining how this 40% reduction is achieved in line with the Major’s energy hierarchy (Be Lean, Be Clean, Be Green).

This 40% improvement from 2010 Regulations is a major step and cannot be achieved simply through energy efficiency measures. Renewables and low carbon energy solutions need to be carefully selected. This is a significant enhancement above Code for Sustainable Homes Level 4.

The GLA will review this policy target once full details of Part L 2013 have been released and reviewed by the Mayor.