where the floor area of that extension does not exceed 30m2, provided that in the case of a conservatory or porch which is wholly or partly glazed, the glazing satisfies the requirements of [F1Part K4, K5.1, K5.2, K5.3, and K5.4 ] of Schedule 1.
Textual Amendments
F1Words in Sch. 2 substituted (E., but only in relation to excepted energy buildings in W.) (6.4.2013) by The Building Regulations &c. (Amendment) Regulations 2012 (S.I. 2012/3119), reg. 28, Sch. 1 (with regs. 1(3), 45-47) (as amended by S.I. 2013/181, reg. 5, Sch.)