Introduction

What is an Approved Document? This document has been approved and issued by the Secretary of State to provide practical guidance on ways of complying with  Requirements G1 to G6 and regulations 7 and 36 of the Building Regulations 2010 (SI 2010/2214) for England and Wales, as amended. The Building Regulations 2010 are referred to throughout the remainder of this Document as ‘the Building Regulations’. Where appropriate the Approved Document also gives guidance on relevant requirements in the Building (Approved Inspectors etc.) Regulations 2010 (SI 2010/2215). The intention of issuing Approved  Documents is to provide guidance about compliance with specific aspects of the Building Regulations in some of the more common building situations. They include examples of what, in ordinary circumstances, may be reasonable provision for compliance with the relevant requirement(s) of the Building Regulations to which they refer. If guidance in an Approved Document is followed there will be a presumption of compliance with the requirement(s) covered by the guidance. However, this presumption is not conclusive, so simply following guidance does not guarantee compliance in an individual case. It is also important to note that there may well be other ways of achieving compliance with the requirements. There is therefore no obligation to adopt any particular solution contained in this Approved Document if you would prefer to meet the relevant requirement in some other way. However, persons  intending to carry out building work should always check with their Building Control Body (BCB), either the local authority or an Approved Inspector, that their proposals comply with Building  Regulations. The guidance contained in this Approved Document relates only to the particular requirements of the Building Regulations that the document addresses (see ‘Requirements’ below). However, building work may be subject to more than one requirement of the Building Regulations. In such cases the work will also have to comply with any other applicable requirements of the Building Regulations. This document is one of a series that has been approved and issued by the Secretary of  State for the purpose of providing practical guidance with respect to the requirements of Schedule 1 and regulation 7 of the Building Regulations 2010 (SI 2010/2214) for England and Wales. At the back of this document is a list of all the documents that have been approved and issued by the Secretary of State for this purpose. Consideration of technical risk In relation to the installation of new and replacement sanitation and hot water services, building work must satisfy all the technical requirements set out in Schedule 1 to the Building Regulations. Attention should be paid in particular to the need to comply with  Part A (Structure), Part B (Fire safety), Part C (Site preparation and resistance to contaminants and moisture), Part J (Combustion appliances and fuel storage systems), Part L (Conservation of fuel and power) and Part P (Electrical safety),as well as Part G.

  1. How to use this Approved Document
    1. Where you can get further help
      1. Responsibility for compliance

        How to use this Approved Document

        In this document the following conventions have been adopted to assist understanding and interpretation: a. Texts shown under 'The Requirements' are extracts from the Building Regulations or Building (Approved Inspectors ) Regulations, and set out the legal requirements that relate to compliance with the sanitation, hot water safety and water efficiency requirements of Building Regulations. It should be remembered however that, as noted above, building works must comply with all the other applicable provisions of Building Regulations. b. Key terms are defined below and are printed in bold italic text. c. Details of technical publications referred to in the text of this document are repeated as references in Appendix C. A reference to a publication is likely to be made for one of two main The publication may contain additional or more comprehensive technical detail, which it would be impractical to include in full in this Document but   which is needed to fully explain ways of meeting the requirements; or it is a source of more general information. The reason for the reference will be indicated in each case. The reference will be to a specified edition of the  document. The Approved Document may be amended from time to time to include new references or to refer to revised editions where this aids compliance.

        Where you can get further help

        If you do not understand the technical guidance or other information set out in this Approved Document and the additional detailed technical references to which it directs you, there are a number of routes through which you can seek further assistance:

        • The Government website: www.gov.uk
        • If you are the person undertaking the building work you can seek assistance either from your local authority building control  service or from your approved inspector (depending on which building control service you are using, or intend to use, to certify compliance of your work with the requirements of the Building Regulations).
        • Businesses registered with a competent person self-certification scheme may be able to get technical advice from their scheme operator.
        • If your query is of a highly technical nature you may wish to seek the advice of a specialist, or industry technical body, in the area of concern.
         

        Responsibility for compliance

        It is important to remember that if you are the person (e.g. designer, builder, installer) carrying out building work to which any  requirement of Building Regulations applies you have a responsibility to ensure that the work complies with any such requirement. The  building owner may also have a responsibility for ensuring compliance with Building Regulation requirements and could be served with an enforcement notice in cases of  non-compliance.

        • 1 Typical discharge pipe arrangement 1 Typical discharge pipe arrangement
        • 2 Separation between hand washbasin or WC and food preparation area - single room 2 Separation between hand washbasin or WC and food preparation area - single room
        • 3 Separation between hand washbasin or WC and food preparation area - two rooms 3 Separation between hand washbasin or WC and food preparation area - two rooms
        • Table 2.1 Maximum fittings consumption Table 2.1 Maximum fittings consumption
        • Table 2.2 Maximum fittings consumption optional requirement level Table 2.2 Maximum fittings consumption optional requirement level
        • Table 3.1 Sizing of copper discharge pipe 'D2' for common temperature relief valve outlet sizes Table 3.1 Sizing of copper discharge pipe 'D2' for common temperature relief valve outlet sizes
        • Table A1 The water efficiency calculator Table A1 The water efficiency calculator
        • Table A2.1 Consumption calculator for multiple taps Table A2.1 Consumption calculator for multiple taps
        • Table A2.2 Consumption calculator for multiple baths Table A2.2 Consumption calculator for multiple baths
        • Table A2.3 Consumption calculator for multiple taps Table A2.3 Consumption calculator for multiple taps
        • Table A2.4 Consumption calculator for multiple dishwashers Table A2.4 Consumption calculator for multiple dishwashers
        • Table A2.5 Consumption calculator for multiple washing machines Table A2.5 Consumption calculator for multiple washing machines
        • Table A2.6 Consumption calculator for multiple showers Table A2.6 Consumption calculator for multiple showers
        • Table A2.7 Consumption calculator for multiple WCs Table A2.7 Consumption calculator for multiple WCs
        • Table A3 Water softener consumption calculation Table A3 Water softener consumption calculation
        • Table A4.1 Greywater demand calculations - WCs Table A4.1 Greywater demand calculations - WCs
        • Table A4.2 Greywater demand calculations - washing machines Table A4.2 Greywater demand calculations - washing machines
        • Table A4.3 Greywater collection calculations - taps Table A4.3 Greywater collection calculations - taps
        • Table A4.4 Greywater collection calculations - showers Table A4.4 Greywater collection calculations - showers
        • Table A4.5 Greywater collection calculations - baths Table A4.5 Greywater collection calculations - baths
        • Table A4.6 Greywater collection calculation Table A4.6 Greywater collection calculation
        • Table A5.1 Rainwater collection calculation - BS 8515 intermediate approach Table A5.1 Rainwater collection calculation - BS 8515 intermediate approach
        • Table A5.2 Rainwater collection calculation - BS 8515 detailed approach Table A5.2 Rainwater collection calculation - BS 8515 detailed approach
        • Table A5.3 Rainwater demand calculations - WCs Table A5.3 Rainwater demand calculations - WCs
        • Table A5.4 Rainwater demand calculations - washing machines Table A5.4 Rainwater demand calculations - washing machines
        • Table A5.5 Rainwater saving calculations for new dwellings Table A5.5 Rainwater saving calculations for new dwellings