insert
(2A) If the planning and land authority makes an exemption declaration that extends a permitted height criterion of a dwelling, the distance of 340mm mentioned in subsection (2) (a) (i) is reduced—
(a) if the criterion is extended by not more than 290mm—by the extended distance stated in the exemption declaration for the criterion; or
(b) if the criterion is extended by more than 290mm—by 290mm.
(2B) In this section:
"exemption declaration"—see section 1.100A (1) (e).