PartG

Part G refers to a specific section of the United Kingdom’s Building Regulations that deals with sanitation, hot‑water safety and water‑efficiency standards in new and altered dwellings and non‑domestic buildings. The regulations were first introduced in 2006 and have been updated periodically to reflect advances in technology, environmental concerns and public health guidance. Part G sets minimum performance criteria for the design, installation and maintenance of sanitary fixtures, drainage systems, hot‑water storage and distribution, as well as measures to reduce water consumption.

Key requirements under Part G include the provision of adequate washbasins, toilets, showers or baths in each habitable room, as well as appropriate waste‑water and surface‑water drainage. The regulation mandates that hot‑water systems must be protected against scalding through temperature‑control devices, and that water storage tanks should be insulated and regularly inspected to prevent legionella growth. Water‑efficiency provisions encourage the use of low‑flow fixtures, dual‑flush toilets and rain‑water harvesting where feasible, aiming to reduce per‑capita water use in line with national sustainability targets.

Compliance with Part G is monitored by local authority building control bodies or approved inspectors, who may require evidence of conformity such as design certificates, test results or maintenance records. Non‑compliance can result in enforcement actions, including the issuance of stop‑work notices or the requirement to remediate non‑conforming works. The regulation interacts with other parts of the Building Regulations, notably Part F (ventilation) and Part H (condensation and mold), to ensure an integrated approach to indoor environmental quality.