What the Bank of Canada paper looked at
Canadian cities between 2020 and 2026. The goal was to break observed rent changes into components that the model can attribute to specific drivers: renter-household growth, financing costs, rental supply, and an unexplained residual.
How large was the rent surge
From Q4 2021 to Q4 2023 the composite index rose about 27.3%. Rents then contracted through Q2 2026 but remained about 21.0% above Q4 2021 levels. Regional patterns varied: Calgary (+45.1%), Halifax (+32.4%), and Quebec City (+31.3%) had the sharpest increases through Q4 2023, while between Q4 2023 and Q2 2026 Vancouver and Toronto led declines (about -10.9% and -10.7% respectively).
What the model explains: population and financing
The researcher finds renter-household growth and financing costs accounted for most of the rise after 2021. In 2022, when interest rates started rising, asking rents were 15.8% higher year-over-year in Q4. The model attributes 7.9 percentage points of that increase to household growth and 7.0 points to financing.
The model also finds rental supply growth reduced rent pressure by about 10 points over the same window, likely driven in part by increased secondary-market rentals such as condo units becoming available for rent in cities like Toronto and Vancouver.
The unexplained early surge
The paper flags a notable unexplained component early in the sample. In Q1 2020 asking rents were up 6.7% year-over-year, and the model assigns 5.4 percentage points of that increase to unexplained factors — roughly 81% of the net early rise. That portion predates the later household-growth surge and the rise in financing costs, and the paper does not identify obvious causes for it.
What this means for interpreting rents
Concrete takeaways for readers
- Expect regional differences to persist: secondary markets drove much of the growth while primary expensive markets saw larger corrections later.
- Financing amplified rent growth when interest rates rose, then faded when rates were cut.
- Population (renter-household) growth is the largest systematic driver in the post-2021 run-up.
- Early-2020 rent gains remain unexplained by the model, which matters for understanding whether later forces were causes or accelerants.