Approved Document G

The first set of national building standards was introduced in 1965. The 'building regulations' establish standards that have to be achieved in the construction of buildings. They set out:

• What qualifies as ‘building work’ and so falls under the control of the regulations.
• What types of buildings are exempt.
• The notification procedures that must be followed when starting, carrying out, and completing building work.
• Requirements for specific aspects of building design and construction.

The 'approved documents' provide guidance for satisfying the requirements of the building regulations in common building situations.

Approved Document G (Sanitation, hot water safety and water efficiency) provides guidance on:

• G1: Cold water supply.
• G2: Water efficiency.
• G3: Hot water supply and systems.
• G4: Sanitary conveniences and washing facilities.
• G5: Bathrooms.
• G6: Food preparation areas.
• Appendix A: Water efficiency calculator for new dwellings.
• Appendix B: Wholesome water.

The 2015 edition of Approved Document G includes new water efficiency requirements and introduces an ‘optional’ standard of 110 litres/person/day where required by planning permission, and an alternative fittings-based approach to demonstrating compliance. It also includes a water-efficiency calculation methodology for new dwellings.

The 2015 edition replaced the amended 2010 edition on 1 October 2015. The amended 2010 edition 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.

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