On average, foreign-language speakers have significantly less housing space per person than other residents: 9 per cent of residents with a national mother tongue and 26 per cent of residents with a foreign mother tongue lived in crowded conditions at the end of 2016. According to Statistics Finland, a dwelling is over-crowded when there is more than one person per room excluding kitchen. In general, over-crowded housing is most common among large households. However, foreign-language speakers live in over-crowded homes more frequently than other residents regardless of the size of the household.

Residents with a foreign mother tongue also live in smaller homes (by square metres). In one-person households, there is no significant difference in the average dwelling size between foreign-language and national-language speakers. For five-member households, for example, the average dwelling size is 107 square metres among population with a national mother tongue versus 20 square metres less among population with a foreign mother tongue. Households with a national mother tongue have more floor space per person (35 square metres) than households with a foreign mother tongue (25 square metres).