In big cities, most Romans lived in apartment buildings we call insulae (IN-sue-lie), or islands (because they often took up a whole city block). During the 100s AD, there were almost 50,000 apartment buildings in Rome (mostly with many families living in them), and fewer than 2000 private houses. At first insulae were usually built of wood. They were usually three or four stories high.
Later, because of the risk of fire, insulae were more often built of brick. We have many insulae preserved to look at today, especially in the Roman port town of Ostia, near Rome. There are also insulae at Pompeii, and at Italica in Spain.
Which would you rather live in, an insula or a house? Why? Suppose you were a slave?
More about Roman houses
More about Roman fast-food restaurants
City : A Story of Roman Planning and Construction, by David Macaulay (1983). For kids – brilliant!
Houses, Villas, and Palaces in the Roman World, by Alexander McKay (1998). For historians, by a specialist.
The City in the Greek and Roman World, by E. J. Owens (1992). Also by a specialist, about town planning.