Last edited 31 Mar 2021

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.