Conservation of fuel and power - GOV.UK

1 2013 edition incorporating 2016 amendments for use in England*L1A Conservation of fuel and power in new dwellingsAPPROVED DOCUMENTL1 AConservation of fuel and powerThe building regulations 2010 ONLINE VERSIONONLINE VERSIONMain changes in the 2010 editionThis 2010 edition, incorporating further 2010 amendments, reflects the changes made as a result of the building regulations 2010 and building (Approved Inspectors etc) regulations 2010. The changes mainly reflect regulation number changes as a result of re-ordering. There have been no amendments to the substantive requirements in Schedule 1 ( Parts A to P) of the building regulations . Please note the simplification of the definition of room for residential purposes in regulation 2 of the building regulations 2010. Please also note that L1(c) has now become regulation changes made by the 2016 amendmentsChanges reflect alterations to the regulations , principally withdrawal of regulations 29 to 33 of the building regulations 2010 and their replacement by Regulation 7A of the Energy Performance of Buildings (England and Wales) regulations 2012 and changes in wording of regulations 24, 25, 26, 26A, 27 and 27A of the building regulations 2010.

2 There are no technical changes.* This approved document gives guidance for compliance with the building regulations for building work carried out in England. It also applies to building work carried out on excepted energy buildings in Wales as defined in the Welsh Ministers (Transfer of Functions) ( ) Order 2009. This approved document also gives guidance applying to buildings of statutory undertakers and of the Crown or carried out by Crown authorities in both England and Wales in respect of regulations 25, 25A, 25B and VERSIONONLINE VERSIONB uilding regulations 2010 Approved Document L1A, 2013 edition iThe approved documentsWhat is an approved document?The Secretary of State has approved a series of documents that give practical guidance about how to meet the requirements of the building regulations 2010 for England. Approved documents give guidance on each of the technical parts of the regulations and on regulation 7 (see the back of this document).

3 Approved documents set out what, in ordinary circumstances, may be accepted as reasonable provision for compliance with the relevant requirements of the building regulations to which they refer. If you follow the guidance in an approved document, there will be a presumption of compliance with the requirements covered by the guidance. However, compliance is not guaranteed; for example, normal guidance may not apply if the particular case is unusual in some that there may be other ways to comply with the requirements there is no obligation to adopt any particular solution contained in an approved document. If you prefer to meet a relevant requirement in some other way than described in an approved document, you should discuss this with the relevant building control addition to guidance, some approved documents include provisions that must be followed exactly, as required by regulations or where methods of test or calculation have been prescribed by the Secretary of approved document relates only to the particular requirements of the building regulations that the document addresses.

4 However, building work must also comply with any other applicable requirements of the building to use this approved documentThis document uses the following Text against a green background is an extract from the building regulations 2010 or the building (Approved Inspectors etc.) regulations 2010 (both as amended). These extracts set out the legal requirements of the Key terms, printed in green, are defined in Appendix When this approved document refers to a named standard or other document, the relevant version are listed in Appendix D (documents referred to) and Appendix E (standards referred to) respectively. However, if the issuing body has revised or updated the listed version of the standard, you may use the new version as guidance if it continues to address the relevant requirements of the building Additional commentary in italic text appears after some numbered paragraphs.

5 This commentary is intended to assist understanding of the immediately preceding paragraph or sub-paragraph, or to direct readers to sources of additional information, but is not part of the technical guidance : Standards and technical approvals may also address aspects of performance or matters that are not covered by the building regulations , or they may recommend higher standards than required by the building VERSIONONLINE VERSIONONLINE VERSIONONLINE VERSIONii Approved Document L1A, 2013 edition building regulations 2010 Where you can get further helpIf you do not understand the technical guidance or other information in this approved document or the additional detailed technical references to which it directs you, you can seek further help through a number of routes, some of which are listed below:a. The Government website: If you are the person undertaking the building work: either from your local authority building control service or from an approved If you are registered with a competent person scheme: from the scheme If your query is highly technical: from a specialist or an industry technical body for the relevant VERSIONONLINE VERSIONONLINE VERSIONONLINE VERSIONB uilding regulations 2010 Approved Document L1A, 2013 edition iiiThe building RegulationsThe following is a high level summary of the building regulations relevant to most types of building work.

6 Where there is any doubt you should consult the full text of the regulations , available at workRegulation 3 of the building regulations defines building work . building work includes: a. the erection or extension of a buildingb. the provision or extension of a controlled service or fittingc. the material alteration of a building or a controlled service or fitting. Regulation 4 states that building work should be carried out in such a way that, when work is complete:a. for new buildings or work on a building that complied with the applicable requirements of the building regulations : the work and the building comply with the applicable requirements of the building for work on an existing building that did not comply with the applicable requirements of the building regulations :(i) the work itself must comply with the applicable requirements of the building regulations (ii) the building must be no more unsatisfactory in relation to the requirements than before the work was carried change of useRegulation 5 defines a material change of use in which a building or part of a building that was previously used for one purpose will be used for another.

7 The building regulations set out requirements that must be met before a building can be used for a new purpose . To meet the requirements, the building may need to be upgraded in some and workmanshipIn accordance with regulation 7, building work must be carried out in a workmanlike manner using adequate and proper materials. Guidance on materials and workmanship is given in Approved Document efficiency requirementsPart 6 of the building regulations imposes additional specific requirements for energy efficiency. If a building is extended or renovated, the energy efficiency of the existing building or part of it may need to be VERSIONONLINE VERSIONONLINE VERSIONONLINE VERSIONiv Approved Document L1A, 2013 edition building regulations 2010 Notification of workMost building work and material changes of use must be notified to a building control body unless one of the following It is work that will be self-certified by a registered competent person or certified by a registered third party.

8 B. It is work exempted from the need to notify by regulation 12(6A) of, or schedule 4 to, the building regulations . Responsibility for compliancePeople who are responsible for building work (for example the agent, designer, builder or installer) must ensure that the work complies with all applicable requirements of the building regulations . The building owner may also be responsible for ensuring that work complies with the building regulations . If building work does not comply with the building regulations , the building owner may be served with an enforcement VERSIONONLINE VERSIONONLINE VERSIONONLINE VERSIONB uilding regulations 2010 Approved Document L1A, 2013 edition vK1 Contents The approved documents Page iThe building regulations iiiApproved Document L1A: Conservation of fuel and power in new dwellings 1 Summary 1 Energy performance certificates 2 Section 1: The requirements 3 Part L of Schedule 1: Conservation of fuel and power 3 Demonstrating compliance 4 Section 2.

9 Design standards 5 regulations 35, 24 and 25 5 Target CO2 Emission Rate (TER) and Target Fabric Energy Efficiency (TFEE) rate 5 Buildings containing multiple dwellings 7 Criterion 1 Achieving the TER and TFEE rate 7 Calculating the CO2 emissions from and fabric energy efficiency performance of the actual dwelling 7CO2 emission rate and fabric energy efficiency rate calculations 8 Secondary heating 10 Internal lighting 10 Buildings containing multiple dwellings 10 Achieving the TER and TFEE rate 11 Consideration of high-efficiency alternative systems 12 Special considerations 13 Criterion 2 Limits on design flexibility 14 Limiting fabric standards 14 Limiting system efficiencies 15 Criterion 3 Limiting the effects of heat gains in summer 16 Limiting the effects of solar gains in summer 16 Heat losses and gains from circulation pipes 16 ONLINE VERSIONONLINE VERSIONvi Approved Document L1A.

10 2013 edition building regulations 2010 Section 3: Quality of construction and commissioning 17 Criterion 4 building performance consistent with DER and DFEE rate 17 Party walls and other thermal bypasses 17 Thermal bridges 19 Air permeability and pressure testing 20 Alternative to pressure testing on small developments 21 Commissioning of heating and hot water systems 21 Section 4: Providing information 24 Criterion 5 Provisions for energy-efficient operation of the dwelling 24 Section 5: Model designs 25 Appendix A: Key terms and abbreviations 27 Appendix B: Types of work covered by this approved document 29 Appendix C: Reporting evidence of compliance 30 Appendix D: Documents referred to 32 Appendix E: Standards referred to 33 Index 34 ONLINE VERSIONONLINE VERSIONB uilding regulations 2010 Approved Document L1A, 2013 edition 1 Approved Document L1A: Conservation of fuel and power in new This approved document is one of four approved documents that give guidance on how to comply with the energy efficiency requirements of the building regulations : Approved Document L1A: Conservation of fuel and power in new dwellingsApproved Document L1B: Conservation of fuel and power in existing dwellingsApproved Document L2A: Conservation of fuel and power in new buildings other than dwellingsApproved Document L2B: Conservation of fuel and power in existing buildings other than dwellingsThe approved documents are supported by the: Domestic building Services Compliance GuideNon-Domestic building Services Compliance This approved document contains the following sections.