Part L1A

MAIN CHANGES IN THE 2010 EDITION


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Approved Document L1A

Conservation of fuel and power in new dwellings (2017 edition)

Abstract

Provides guidance for complying with energy efficiency requirements in new dwellings and covers: five criteria for compliance, calculating the CO2 emission rate for the dwelling to ensure it does not exceed target CO2 emission rates, setting minimum energy efficiency standards for building fabric and services, how to reduce the risk of overheating in dwellings, procedures to ensure performance is as designed, information to be provided for the occupier and procedures for notifying building control


Document History

For use in Wales. This 2017 edition came into effect 31 July 2017 and superseded: DCLG Conservation of fuel and power in new dwellings (2014 edition). Main changes in the 2017 edition: This approved document, Approved Document L1A: Conservation of fuel and power in new dwellings supports the energy efficiency requirements of the Building Regulations. Regulation 2(1) of the Building Regulations defines the energy efficiency requirements as the requirements of regulations 23, 25A, 25B, 26, 26A, 26B, 28, 29 and 40 and Part L of schedule 1. It takes effect on 31 July 2014 and is for use in Wales. The 2010 edition will continue to apply to work begun before 31 July 2014, or to work subject to a building notice, full plans application or initial notice submitted before 31 July 2014. The main changes in the approved document are that: a new requirement, regulation 26B, has been introduced that requires new dwellings to achieve or better target fabric performance values. The Part L 2014 specifications have been strengthened to deliver 8% carbon dioxide savings across the new homes build mix relative to Part L 2010. A new elemental specification for new dwellings has been introduced for the purpose of target setting. A summary of the Part L 2014 elemental specification is published at Table B1 in the Approved Document. If the actual dwelling is constructed entirely to the elemental specification it will typically meet the carbon dioxide target and the limiting values for individual fabric elements and building services. Developers are however free to vary the specification, provided the same overall level of carbon dioxide emissions is achieved or bettered. The document consolidates the amendments made in SI 2013/747 requiring the feasibility of high efficiency alternative systems to be taken into account before construction commences. The guidance for insulation of circulation pipes within communal spaces is given greater prominence. The document is in a new style format


Year of publication: 2017

Pages: 47

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