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6
At the Census, 1921, the number of structurally separate dwellings occupied
in the Borough by private families was 6,494. A structurally separate dwelling
is defined for the Census as "any room or set of rooms intended or used for
habitation, having separate access either to the street or to a common landing or
staircase;" thus each flat in a block of flats is a separate unit; a private house not
structurally sub-divided is similarly a single unit, whether occupied by one or
more families, but where a private house has been sub-divided into maisonettes
each having its front door opening on to the street or on to a common landing
or staircase, then each such portion is treated as a separate unit.
It will be seen from the following table that at the date of the Census, 1921.
there were 3,473 "buildings" in the Borough containing dwellings; 1,604
"buildings" not containing dwellings (i.e., used for business purposes only) and
12 in course of erection.
In the enumeration of buildings a "building" has generally been regarded
as a structure wholly detached or separated from another by a vertical party wall.
A block of flats would be one building.

22.3 per cent, of the private families in the Borough were found to be living
in one-room tenements; 32.3 per cent, in two-room tenements; 22.9 per cent, in
three-room tenements; 11 per cent, in four-room tenements and 11.5 in tenements
of five or more rooms. 26,911 rooms were occupied by private families, the
average number of rooms per person being 0.89. Of the total population, 8.4 per
cent, resided in one-room tenements; 21.2 in two-room tenements; 19.1 in threeroom
tenements and 9.6 in four-room tenements.