| Year of construction | Buildings | Floor space | ||||
|---|---|---|---|---|---|---|
| # | QI | Share | millions of m2 | QI | Share | |
| Before 1920 | 27,108 | B | 5.6% | 38.9 | B | 4.8% |
| 1920 to 1959 | 86,760 | A | 18.0% | 109.6 | A | 13.6% |
| 1960 to 1969 | 51,004 | A | 10.6% | 111.3 | A | 13.9% |
| 1970 to 1979 | 95,861 | A | 19.9% | 152.7 | A | 19.0% |
| 1980 to 1989 | 69,096 | A | 14.3% | 139.5 | A | 17.4% |
| 1990 to 1999 | 68,978 | A | 14.3% | 117.8 | A | 14.7% |
| 2000 to 2009 | 64,112 | A | 13.3% | 94.7 | A | 11.8% |
| 2010 or later | 19,483 | B | 4.0% | 38.7 | C | 4.8% |
| Canada | 482,402 | A | 100.0% | 803.1 | A | 100.0% |
Legend:
Quality indicators (QI) classify each estimate according to its quality as follows: A–20% or less, B–between 20% and 30%, C–between 30% and 40%, and F–more than 40%.