3.—(1) In regulation 2(1)(1)—
(a)after the definition of “building work” insert—
““change to a building’s energy status” means any change which results in a building becoming a building to which the energy efficiency requirements of these Regulations apply, where previously it was not;”;
(b)after the definition of “electrical installation” insert—
““energy efficiency requirements” means the requirements of regulations 4A, 17C and 17D and Part L of Schedule 1;”;
(c)after the definition of “final certificate” insert—
““fixed building services” means any part of, or any controls associated with,—
fixed internal or external lighting systems, but does not include emergency escape lighting or specialist process lighting; or
fixed systems for heating, hot water service, air conditioning or mechanical ventilation;”; and
(d)after the definition of “public body’s notice” insert—
““renovation” in relation to a thermal element means the provision of a new layer in the thermal element or the replacement of an existing layer, but excludes decorative finishes, and “renovate” shall be construed accordingly;”.
(2) After paragraph (2) insert—
“(2A) In these Regulations “thermal element” means a wall, floor or roof (but does not include windows, doors, roof windows or roof-lights) which separates a thermally conditioned part of the building (“the conditioned space”) from—
(a)the external environment (including the ground); or
(b)in the case of floors and walls, another part of the building which is—
(i)unconditioned;
(ii)an extension falling within class VII in Schedule 2; or
(iii)where this paragraph applies, conditioned to a different temperature,
and includes all parts of the element between the surface bounding the conditioned space and the external environment or other part of the building as the case may be.
(2B) Paragraph (2A)(b)(iii) only applies to a building which is not a dwelling, where the other part of the building is used for a purpose which is not similar or identical to the purpose for which the conditioned space is used.”.