Section G2 Water efficiency

The Requirement G2 and Regulation 36

This Approved Document deals with the following Requirement from Part G of Schedule 1 and regulation 36 to the Building Regulations 2010, as amended.

Requirement

Water efficiency

G2 Reasonable provision must be made by the installation of fittings and fixed appliances that use water efficiently for the prevention of undue consumption of water.

Water efficiency of new dwellings

36.—(1) The potential consumption of wholesome water by persons occupying a new dwelling must not exceed the requirement in paragraph (2).

(2) The requirement referred to in paragraph (1) is either—

(a) 125 litres per person per day; or

(b) in a case to which paragraph (3) applies, the optional requirement of 110 litres per person per day,

as measured in either case in accordance with a methodology approved by the Secretary of State.

(3) This paragraph applies where the planning permission under which the building work is carried out—

(a) specifies the optional requirement in paragraph (2)(b); and

(b) makes it a condition that that requirement must be complied with.

(4) In this Part, “new dwelling” does not include a dwelling that is formed by a material change of use of a building within the meaning of regulation 5(g).

Wholesome water consumption calculation

37.—(1) Where regulation 36 applies, the person carrying out the work must give the local authority a notice which specifies—

(a) which of the requirements in regulation 36(2)(a) or (b) applies to the dwelling; and

(b) the potential consumption of wholesome water per person per day in relation to the completed dwelling.

Building (Approved Inspectors) Regulations 2010

Application of Provisions of the Principal Regulations

20.—(1) Regulation 20 (provisions applicable to self certification schemes), 27 (CO2 emission rate calculations), 29 (energy performance certificates), 37 (wholesome water consumption calculation), 41 (sound insulation testing), 42 (mechanical ventilation air flow rate testing), 43 (pressure testing) and 44 (commissioning) of the Principal Regulations apply in relation to building work which is the subject of an initial notice as if references to the local authority were references to the approved inspector.

(4) Regulation 37(2) of the Principal Regulations applies in relation to building work which is the subject of an initial notice as if after “work has been completed” there were inserted, “or, if earlier the date on which in accordance with regulation 17 of the Building (Approved Inspectors etc.) Regulations 2010 the initial notice ceases to be in force”.

Limits on Application

Requirement G2 applies only when a dwelling is—

(a) erected; or

(b) formed by a material change of use of a building within the meaning of regulation 5(a) or (b).

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