Main Changes in the 2015 Edition

This approved document supports Regulation 36 and Part G of Schedule 1 to the Building Regulations 2010. It takes effect on 1 October 2015 for use in England*. The 2010 edition, as amended, will continue to apply to work started before 1 October 2015 or work subject to a building notice, full plans application or initial notice submitted before that date. The main changes are:

• Introduction of an optional requirement for tighter water efficiency in Regulation 36 (section G2). • Introduction of a fittings approach as an alternative to using the water efficiency calculator (section G2). • Inclusion of the water efficiency calculator methodology into this approved document, with minor alterations resulting from European efficiency labelling and consequential amendments resulting from removal of references to the Code for Sustainable Homes (Appendix A). • The annex listing the relevant competent person self-certification schemes has been deleted.

CHANGE MADE BY THE 2016 AMENDMENTS The change, made to section G2, requires the water efficiency calculator to be completed for new dwellings where a shower will not be provided.

  • 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