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Part L changes incorporate cooling demand

The 2014 Approved Documents L1A and L2A , which provide guidance on Conservation of Fuel and Power in new buildings, incorporates cooling and heating demands

According to BSRIA, a requirement to calculate the fabric energy efficiency has now been included. This is in addition to calculating CO2 emissions, which has been a requirement since 2006.

Fabric energy efficiency is measured in kWh per square metre of floor area, and takes into account the space heating and cooling demand.

The CO2 emissions, on the other hand, are measured in kg of CO2 per square metre of floor area and the calculation only takes cooling into account for dwellings that use mechanical cooling. To achieve compliance, both the fabric energy efficiency and CO2 emissions must be below those of a notional dwelling.

This notional dwelling has been redefined such that an emissions reduction of 6 per cent is achieved, compared with dwellings that meet 2010 standards.

The methods of compliance for new non-dwellings have not changed significantly, however the CO2 emissions reduction is greater than for dwellings: 9%.

This means more energy efficiency measures will need to be incorporated, and even though renewables are not a requirement, more designs may incorporate them as a means of achieving the CO2 target.

Some of the minimum plant efficiencies, set out in the Non-domestic Building Services Compliance Guide have been upgraded – for example the minimum efficacy of lighting in office, industrial and storage areas has been upgraded from 55 to 60 luminaire lumens per circuit-watt.

Changes to the Approved Documents for existing buildings – L1B and L2B – are minimal. So much so, that they have been issued as an amendment slip. We are, however, assured that consolidated versions of these Approved Documents will be issued before they come into effect on 6th April.

BSRIA runs Building Regulations training courses - Introduction to the Building Regulations next runs on 12th March, and Understanding Parts L & F next runs on 25th February. Any of our courses can be run in-company and customised to meet the needs of your staff.

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