(1) A window or balcony must not project beyond the street alignment—
(a) of a narrow street; or
(b) of a medium street.
(2) A window or balcony must not project beyond the street alignment of a wide street—
(a) more than 1 m horizontally; and
(b) at a height less than—
(i) 5 m above any part of the street that may be used by a motor vehicle; or
(ii) 3 m above the level of the street in any other case; and
(c) within 1·2 m of the side boundary of an adjoining allotment.