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From Etiquette, The Blue Book of Social Usage,
Emily Post (Mrs. Price Post), copyright 1945:

The position of the chauffeur differs from that of the
other domestic employees in two respects. The first
is that he has no regular days out. Second, he usually
finds (and pays for) his own board and lodging.
Sometimes a single man eats with the servants
in the kitchen, but this is not usual. Sometimes, too,
there may be a room over the garage that has been
converted from a stable -- in which he and his family
may live.


Just in case you wondered.