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situated that from any point thereon, or, if the
total window area exceeds the foregoing minimum
requirement, from any point on a part or parts
thereof which satisfy that requirement, a line can
be drawn upwards at an angle of thirty degrees with
the horizontal in a vertical plane at right angles to
the plane of the window without intercepting any
obstruction except an open fence within a distance
of ten feet measured horizontally from the window.
For this purpose a bay window with side lights shall
be deemed to be a flat window equal in area to the
sum of the areas of the front and side lights, situated
at a distance from the face of the wall from which it
projects equal to half the maximum depth of the
projection.
7. Immediately outside any window provided in pursuance of
these regulations there shall be an unobstructed space which shall
conform with the following requirements: -
(i) The space shall extend throughout the entire width of
the window and (except where the area of such window
is not less than one-seventh of the area of the floor of
the room) for two feet on each side of the window.
(ii) The space shall in every part extend for not less than
two feet from the external wall of the room except that,
where the window is a bay window with side lights , the
depth of the space in front of that window may be reduced
to not less than one foot.
(iii) If the space is below the general level of the ground
within nine feet from the window so much of it as
satisfies the foregoing requirements of this regulation
shall be properly paved with impervious material and
effectually drained, and the paved surface shall be at
least six inches below the level of the bottom of the sill
of the window.
Nothing in this Regulation shall probit the placing in or over
such open space of any steps necessary for access to any part
of the building in which the room is contained, provided they are
not placed over or across any window satisfying the requirements
of the preceding Regulations.