27.—(1) This regulation applies where a building is erected and regulation 26 applies.
(2) Not later than the day before the work starts, the person carrying out the work shall give the local authority a notice which specifies—
(a)the target CO2 emission rate for the building,
(b)the calculated CO2 emission rate for the building as designed, and
(c)a list of specifications to which the building is to be constructed.
(3) Not later than five days after the work has been completed, the person carrying out the work shall give the local authority—
(a)a notice which specifies—
(i)the target CO2 emission rate for the building,
(ii)the calculated CO2 emission rate for the building as constructed, and
(iii)whether the building has been constructed in accordance with the list of specifications referred to in paragraph (2)(c), and if not a list of any changes to those specifications; or
(b)a certificate of the sort referred to in paragraph (4) accompanied by the information referred to in sub-paragraph (a).
(4) A local authority are authorised to accept, as evidence that the requirements of regulation 26 have been satisfied, a certificate to that effect by an energy assessor who is accredited to produce such certificates for that category of building.
(5) In this regulation, “specifications” means specifications used for the calculation of the CO2 emission rate.