1964_BUILDING_(PLANNING)_REGULATIONS — Page 16

F 16

[Subsidiary]

CAP. 123]

Building (Planning) Regulations

[1984 Ed.

Lighting and ventilation. G.N.A. 83/59.

Lighting and ventilation of rooms used or intended to be used for habitation or as an office or kitchen.

G.N.A. 83/59.

G.N.A. 97/62.

L.N. 294/76.

Minimum requirements of window.

G.N.A. 83/59.

L.N. 294/76.

G.N.A. 97/62.

PART IV

## LIGHTING AND VENTILATION

29. Every storey of every building used or intended to be used for the purpose of an office or for habitation shall be provided with effectual means of lighting and ventilation.

30. (1) Every room used for habitation or for the purposes of an office or as a kitchen shall be provided with natural lighting and ventilation.

(2) Such natural lighting and ventilation shall be provided by means of one or more windows which shall be-

(a) so constructed that---

(i) the aggregate superficial area of glass in the window or windows is not less than one-tenth of the area of the floor of the room; and

(ii) the windows can, to an extent at least equal in the aggregate to one-sixteenth of the area of the floor of the room, be opened in such manner that the top of the opening of each window is at least 2 m above the level of the floor or, in the case of detached and semi-detached buildings, at least 1.9 m above the level of the floor; and

(b) such that not less than the area required by sub-paragraph (a)(i) (hereinafter referred to as the prescribed window) faces directly into the external air.

31. (1) No prescribed window shall, for the purposes of regulation 30, be deemed to face into the external air unless-

(a) it faces into a street which is not less than 4.5 m wide; or

(b) it faces into a space uncovered and unobstructed above the area delineated by the rectangular horizontal plane; and

(c) it is so placed that, if another rectangular plane, the base whereof is equal to and common with the base of the rectangular horizontal plane, is inclined, above the rectangular horizontal plane, at an angle of 71° from the horizontal where the window is in a room used for habitation or 76° from the horizontal where the window is in a room used for the purposes of an office or as a kitchen, no part of the building, or of any other building within the site on which such building is erected, protrudes above such plane; or

(d) where such window opens on to an area bounded on the side opposite the window by a boundary of the site on which the building is erected, such window is so placed that, if the rectangular horizontal plane is projected to such boundary and, from the position at which it first intersects the boundary, another rectangular plane, the base whereof is parallel and level with the sill of the window and has a length equal to the length of the base of the rectangular horizontal plane, is inclined at an angle of 71° or 76°, as the case may be, no part of the building or of any other building within the site protrudes above such plane.