7 (1) Unless provided otherwise by any relevant town planning scheme, space outside required day-light openings shall comply with the provisions of this section.

(2) Where a daylight opening faces directly towards a permanently unobstructed open space within the stand on which the building is located, or a street, or a public place, or any combination of these which totals more than 4,5 metres in width, the height of the building above the sill of the daylight opening concerned shall not exceed that show in Table III, for the “depth-of-open-air-measurement” opposite the daylight opening.

TABLE III
MINIMUM PERMISSIBLE DEPTH-OF-OPEN-AIR-MEASUREMENT OPPOSITE REQUIRED DAYLIGHT OPENINGS
*For intermediate values of permissible height of building, the minimum depth-of-open-air-measurement shall be found by linear interpolation

(3) The “depth-of-open-air-measurement” required in subsection (2) shall be the distance measured in a horizontal plane, at the level of the sill of required daylight opening concerned, and at right-angles to the plane of the wall-face containing such opening, from the farther boundary of open space, street or public place described in that subsection, to the face of the wall containing the opening:

Provided that, where a cornice, balcony or similar projection from the building containing such opening extends over such line of measurement by a distance greater than 500 millimetres, the measurement shall be made to a vertical line drawn through the edge of the widest overhanging projection.

1The requirements of section 7 do not necessarily ensure adequate open space about buildings. This may be controlled by the town planning scheme in force in the area of jurisdiction of the local authority, and such requirements must, if necessary, be amended, to avoid conflict with the town planning scheme.

(4) Where a required daylight opening does not face such open space, street or public place as described in subsection (2), it shall face an unobstructed open space, termed a “required daylight space” which complies with the following requirements—

a) it shall cover an unobstructed plan area in the space of a rectangle or parallelogram with dimensions D and W, as described in paragraphs (c) and (d), not less than the dimensions set out in Table IV;

b) the plan area of the required daylight space shall be measured beyond the boundary of an adjoining stand, or beyond the centre-line of an adjoining street or public place;

c) the dimension W (the width) of the plan area shall be measured always parallel to the face of the wall containing the daylight opening, and shall, wherever measured, always be bisected by the line of measurement of dimension D, as illustrated in the Figure;

d) the dimension D (the depth) of the plan area shall be measured from the mid-point of the sill of the daylight opening and at an angle β to the plane of the wall containing such opening, the angle β being not less than 30 degrees, as illustrated in the Figure;

e) the required daylight space shall be measured clear of any obstructions projecting from the surrounding walls at levels above that of the sill of the daylight opening, unless such projecting obstructions are less than 500 millimetres in width, in which case such obstructions may be disregarded.

FIGURE

REQUIRED DAYLIGHT SPACE

(5) If the required daylight space is a parallelogram in plan, the minimum area admitting light of the daylight opening shall be increased above that set out in Table I by the percentages set out in Table V corresponding to the value of the angle β

TABLE IV
MINIMUM PLAN DIMENSIONS OF REQUIRED DAYLIGHT SPACE IN RELATION TO HEIGHT OF BUILDING

*For intermediate heights, the values of D and W shall be found by linear interpolation

(6) Where the height of the building from the sill of the daylight opening is referred to in subsection (2) and in Tables III and IV, such height shall be measured as the vertical distance from the level of the sill at the daylight opening concerned to the eaves or the top of the parapet, or, where this does not apply, and in the case of stepped buildings, to such other positions as the local authority may consider to be the top of the building containing the daylight opening.

TABLE V
INCREASE IN AREA OF REQUIRED DAYLIGHT OPENINGS IN TERMS OF SECTION 7 (5)
*where β, as measure, is intermediate to the values given in this Table, the appropriate percentage increase in area of required daylight opening shall be obtained by linear interpolation.