Home And Mortgage Insurance Rose 4.9% In September While Mortgage Interest Costs Fell 0.2%

Reading the time frames correctly

The 4.9% compares September 2026 with September 2025. It is not a monthly jump. On a monthly basis, the insurance index rose 0.9% between August and September.

The time frames can even point in opposite directions. The mortgage interest cost index fell 0.2% over the year but rose 0.3% over the month. Neither number is wrong. They answer different questions, and a headline that quotes one without the other can leave a misleading impression.

Where 4.9% sits in the trend

September's reading is an acceleration from August's 4.3%. It is not a record. In the October 2025 CPI release, the same index was rising 6.8% year over year, with Alberta at 13.7%. Statistics Canada also reported then that the index had climbed 38.9% nationally since October 2020. So the pressure has eased from last year's pace, then picked up again over the past month.

The index level adds perspective. With 2002 set at 100, the all-items CPI stood at 170.0 in September. The home and mortgage insurance index stood at 382.5. Over the long run, insuring a home has risen far faster than prices in general.

Why your renewal is not 4.9%

A national index is an average across profiles and regions. Your premium is set on your house. The Insurance Bureau of Canada lists the factors insurers weigh in its guide to how home insurance rates are set: the home's replacement cost and contents, the age and condition of electrical, plumbing and roofing, wood stoves, special features such as pools or a home business, location and local claims experience, distance to a hydrant and fire station, and your own claims history.

Two neighbours can see very different renewals in the same month. A homeowner in a postal code hit by repeated basement flooding may face a sharp increase. A homeowner who updated wiring and a roof may see a modest one, or none.

For how the core inflation measures behaved last month, and why they matter more to renewing borrowers than the headline, see our report on August core inflation at 1.9%.

The multi-year picture

The September print sits on a long upward trend. A Statistics Canada study of extreme weather and insurance costs released in June found that homeowners' home and mortgage insurance premiums rose 45.0% from December 2019 to December 2025, more than double the 21.0% rise in the all-items CPI. Over the most recent five years, Alberta, Manitoba, Nova Scotia and Saskatchewan all rose faster than the national rate. The agency linked higher insurance expenses to extreme weather and said insurers raised premiums to compensate.

The 2026 loss record so far

Insured catastrophe losses have kept arriving this year. The Insurance Bureau of Canada reported that early September storms in the Greater Toronto Area and southern Ontario caused $563 million in insured damage, based on initial estimates from Catastrophe Indices and Quantification Inc. (CatIQ). The same release noted that flood and water-related insured losses over the past 20 years are more than 300% higher than in the previous two decades.

On the Prairies, ten summer events across Alberta, Saskatchewan and Manitoba caused more than $1.8 billion in insured damage, led by June storms in Saskatchewan and Manitoba that exceeded $900 million on their own. Unusually for a Prairie summer, heavy rain and flooding, rather than hail, drove most of the damage. Both figures are initial estimates and can be revised as claims settle.

What the evidence does not show

There is a temptation to draw a straight line from this summer's storms to September's 4.9%. The data does not support a line that clean. Premiums are priced on many factors, insurers file at different times, and losses from one season can take a year or more to work through pricing. At least one market summary published on release day attributed the insurance increase to rising bond yields. Statistics Canada's release makes no such link, and the agency's methodology prices the index on the insured structure and the risk of loss.

The fair statement is narrower. Statistics Canada has documented a multi-year rise in premiums alongside rising weather losses, and the industry body says loss trends feed insurance costs. September's figure is consistent with that pattern. It is not proof of a single cause.

For how insurer results and provincial premium increases compared earlier this year, see our report on Q1 home insurance premiums rising 8.6%.

Why the premium is worth comparing

Home insurance does not work like auto insurance in Canada. In a 2024 analysis of homeowners insurance, Statistics Canada noted that homeowners insurance, unlike auto, is neither regulated nor mandatory under law, though lenders require it as a condition of a mortgage. The same analysis counted more than 100 insurers competing for auto and property business. There is no provincial approval process smoothing home insurance rate changes, which makes the renewal notice a price worth checking rather than a bill to file.

A short checklist

None of this calls for drastic action. It calls for twenty minutes with your renewal and your current policy side by side.

• Compare the total premium to last year's. Note the percentage change. If it is well above 4.9%, ask your insurer or broker what drove it.
• Check the dwelling coverage limit. If it went up, ask how the new figure was calculated and whether it reflects your home's actual size, finishes and recent renovations. If it stayed flat after major work, it may be too low.
• Separate price changes from coverage changes. A higher premium can come from an added endorsement, such as sewer backup or overland water, or from a changed deductible. Those are choices, not inflation.
• Ask about credits you may qualify for. Updated wiring, plumbing or roofing, monitored alarms and water-protection devices can affect pricing with some insurers.
• Get at least one comparison quote for the same coverage. Match limits, deductibles and endorsements so the comparison is fair.