England & Wales Building Regulations: Part G: Sanitation, hot water safety and water efficiency - A summary of the requirements and amendments (Version 1)

TRADA image

The 1992 / 2000 edition of Approved Document G (Part G) was simply entitled Hygiene. The much longer revised title indicates two areas where the scope of Part G has increased, namely water efficiency and hot water safety.

Being an almost complete re-write, the 2009 edition contains a number of significant changes, the most notable of which include the differentiation between wholesome (drinking quality) and non-wholesome water, the requirement of temperature limiting taps to prevent scolding and the choice of new water calculation tool to regulate water consumption

This Construction Briefing gives readers a broad summary of the contents of the new part G, explains why the changes were necessary and provides commentary on the practical implications of the changes.


  • General guidance 
  • Cold water supply (G1)
  • Water efficiency (G2 and regulation 17K)
  • Water calculation tool
    • Table 1: Water calculator for new dwellings
  • Hot water and supply and systems (G3)
  • Sanitary conveniences and washing facilities (G4)

Suggested Reading

Dynamic response of timber flitch beamsnavigation-arrow

Through experimental analysis, James Norman, Joel Ross, Robbie Kirkbride and Toby Hill-Smith outline the damping exhibited in these complex beams.


Article from Timber 2017 Industry Yearbook

01/03/2017 |  Magazine Article  

A motorway service station - but not as we know itnavigation-arrow

Exposed timber structures sympathetic to their rural surroundings are at the heart of a recently opened motorway service station in Gloucester.


Article from Timber 2018 Industry Yearbook

14/05/2018 |  Magazine Article  

Joinery: natural retreatnavigation-arrow

Outright winner of the prestigious Wood Awards 2017, the Coastal House is a showcase for the many uses of timber and some fine joinery.


Article from Timber 2018 Industry Yearbook

15/05/2018 |  Magazine Article