11.—(1) This regulation applies to any buildings with a total useful floor area over 1000 m2 which are occupied by public authorities and by institutions providing public services to a large number of persons and are therefore frequently visited by those persons.
(2) On or after 30th December 2008 the occupier of any building to which this regulation applies shall—
(a)display at all times a valid display energy certificate in a prominent place clearly visible to the public; and
(b)have in his possession or control at all times a valid advisory report.
(3) A display energy certificate is valid for a period of 12 months beginning on the nominated date.
(4) An advisory report is valid for a period of 7 years beginning on the date it is issued.
12. A display energy certificate shall—
(a)be in a form approved by the Department;
(b)subject to regulation 13, express—
(i)the operational rating; and
(ii)the asset rating,
of the building;
(c)show the operational ratings for the building that were expressed in any certificates displayed by the occupier during the 2 years before the nominated date;
(d)include reference values such as current legal standards and benchmarks;
(e)be issued by an energy assessor who under regulation 19 is accredited to produce display energy certificates for that category of building; and
(f)include the following information—
(i)the reference number under which the certificate has been registered in accordance with regulation 25;
(ii)the address of the building;
(iii)the total useful floor area of the building;
(iv)the name of the energy assessor who issued it;
(v)the name and address of the energy assessor’s employer, or if he is self-employed, the name under which he trades and his address;
(vi)the date on which it was issued;
(vii)the nominated date; and
(viii)the name of the approved accreditation scheme of which the energy assessor is a member.
13.—(1) Subject to paragraph (3), regulation 12(b)(i) shall not apply in relation to a display energy certificate that is displayed by an occupier of a building at any time before he has been in occupation of the building for 15 months.
(2) Regulation 12(b)(ii) does not apply in relation to a display energy certificate which is displayed by an occupier who entered into occupation of the building before 31st December 2008.
(3) Where on 31st December 2008 the occupier of a building has been in occupation for less than 15 months the operational rating specified for the purposes of regulation 12(b)(i) may be calculated over the period in which the occupier has been in occupation.