The housing agency says vacancy rates varied across the country, from a high of 38.7 per cent in Newfoundland and Labrador to a low of 4.8 per cent in Manitoba.
Vacancy rates for standard spaces were above average in Ontario, British Columbia and Alberta and below average in Saskatchewan, Nova Scotia, New Brunswick, Prince Edward Island and Quebec.
It says the average Monthly rent for bachelor units and private rooms, where at least one meal is included in the rent, was $1,966 in 2012, up from $1,903 in 2011.
Ontario had the highest average rent at $2,699, while Quebec had the lowest, with an average of $1,410.
CMHC says 202,091 seniors lived in the 2,586 residences it surveyed.