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METROPOLITAN BOROUGH OF ST. MARYLEBONE
CENSUS, 1931
TABLE No. 3 .
Acreage, Population, Private Families and Dwellings
Private Family.—Any person or group of persons included in a separate return as being in separate occupation of any premises or part
of premises is treated as a separate family for Census purposes, lodgers being so treated only when returned as boarding separately and not
otherwise. Private families comprise all such families with the exception of those enumerated in (i) Institutions or (ii) business establishments
or boarding houses in which the number of resident trade assistants or resident boarders exceeds the number of members of the employer's or
householder's family (including private domestic servants).
Structurally Separate Dwellings.—A structurally separate dwelling has been 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 which has not been structurally sub-divided is similarly a single unit whether occupied by one family or by
several families. But where a private house has been sub-divided into maisonettes or portions, each having its front door opening on to
the street, or on to a common landing or staircase to which visitors have access, then each such portion is treated as a separate unit.