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Regulation 27B Fabric performance values calculationsF6F1C1

England and Wales

(1)

This regulation applies where a dwelling is erected and regulation 26B applies.

(F22)

The person carrying out the work must—

(a)

where the dwelling is within a higher-risk building, ensure the application for building control approval in relation to the work is accompanied by a notice which specifies—

(i)

the target fabric performance values for the dwelling, calculated and expressed by the methodology approved under regulation 24,

(ii)

the fabric energy performance values for the dwelling as designed, calculated and expressed by the methodology approved pursuant to regulation 24, and

(iii)

a list of specifications to which the dwelling is to be constructed;

(b)

in any other case, not later than the day before the work starts give the building control authority a notice which specifies the matters set out in paragraphs F3(i) to (iii) of sub-paragraph (a).

(3)

The person carrying out the work must—

(a)

where the dwelling is within a higher-risk building, ensure the completion certificate application in relation to the work is accompanied by—

(i)

a notice which specifies—

(aa)

the target fabric performance values for the dwelling, calculated and expressed by the methodology approved pursuant to regulation 24,

(bb)

the fabric energy performance values for the dwelling as constructed, calculated and expressed by the methodology approved pursuant to regulation 24, and

(cc)

whether the dwelling has been constructed by the list of specifications referred to in paragraph (2), and if not, a list of any changes to those specifications, or

(ii)

a certificate of the sort referred to in paragraph (4) accompanied by the information referred to in sub-paragraphs (aa) to (cc) of paragraph (i);

(b)

in any other case, not later than 5 days after the work has been completed give the building control authority a notice which specifies the matters mentioned in sub-paragraphs (aa) to (cc) F4of sub-paragraph (a)(i) or a certificate of the sort mentioned in sub-paragraph (a)(ii).

(4)

A F5building control authority is authorised to accept, as evidence that the requirements of regulation 26B have been satisfied, a certificate to that effect by an energy assessor who is accredited to produce F7energy performance certificates for that category of building.

(F84A)

Where the building control authority is a designated local authority under section 91ZD of the Act, it must send a copy of each notice or certificate it receives under this regulation in relation to a building to the local authority for the area in which the building is situated.

(5)

In this regulation, “specifications” means specifications used for the calculation of the fabric performance values.

Annotations

Textual amendments

F1

Regs. 27A, 27B inserted (W. but not in relation to excepted energy buildings) (31.7.2014) by The Building (Amendment) (Wales) Regulations 2014 (S.I. 2014/110), regs. 1(3), 7 (with reg. 1(2))

F2

Reg. 27B(2)(3) substituted (1.7.2026) by The Building etc. (Amendment) (No. 2) (Wales) Regulations 2025 (S.I. 2025/1320), regs. 1(2), 6(13)(a) (with reg. 19)

F3

Word in reg. 27B(2)(b) substituted (20.7.2026) by The Building etc. (Amendment) (No. 2) (Wales) Regulations 2026 (W.S.I. 2026/112), regs. 1(2), 3(14)(a)

F4

Words in reg. 27B(3)(b) inserted (20.7.2026) by The Building etc. (Amendment) (No. 2) (Wales) Regulations 2026 (W.S.I. 2026/112), regs. 1(2), 3(14)(b)

F5

Words in reg. 27B(4) substituted (1.7.2026) by The Building etc. (Amendment) (No. 2) (Wales) Regulations 2025 (S.I. 2025/1320), regs. 1(2), 6(13)(b) (with reg. 19)

F6

Reg. 27B inserted (W. for remaining purposes) (8.6.2018) by The Building Regulations &c. (Amendment) (Excepted Energy Buildings) (Wales) Regulations 2018 (S.I. 2018/558), regs. 1(2), 7(7) (with reg. 29)

F7

Words in reg. 27B(4) substituted (W. but not in relation to excepted energy buildings) (17.6.2016) by The Building Regulations &c. (Amendment) (Wales) Regulations 2016 (S.I. 2016/611), regs. 1(4), 2(15)(e) (with reg. 1(3))

F8

Reg. 27B(4A) inserted (1.7.2026) by The Building etc. (Amendment) (No. 2) (Wales) Regulations 2025 (S.I. 2025/1320), regs. 1(2), 6(13)(c) (with reg. 19)

Modifications

C1

Reg. 27B applied (with modifications) by S.I. 2010/2215, reg. 20(1)(2B) (as inserted (W.) (31.7.2014) by The Building (Amendment) (Wales) Regulations 2014 (S.I. 2014/110), regs. 1(3), 13 (with reg. 1(2))) (as amended: (W.) (8.6.2018) by S.I. 2018/558, regs. 1(2), 21 (with reg. 29); and (W.) (25.4.2024) by S.I. 2024/447, regs. 1(1), 3(h) (with reg. 6))