Report: Climate Change Added $533 a Year to the Average Canadian Home Insurance Premium Since 2008

Separate the Levers You Can See From the One You Cannot

The disclosure gap does not leave you with nothing. It leaves you with a specific and knowable subset. The Financial Consumer Agency of Canada sets out the inputs that shape a premium, and they include residence type, building materials, age, size and location, replacement value, distance to a fire hydrant or fire station, neighbourhood crime rate, claims history, the type of policy and coverage selected, and the deductible. Most of those are facts about your property and your choices. You can verify them, and you can change some of them. The federal consumer agency also notes that premiums vary from one insurer to another, and that flood pricing in particular is set by the level of flood risk in an area — in very high-risk areas an insurer may decline coverage outright, or offer it while raising the deductible and lowering the limit.

What you cannot see is the base rate: the change applied across everyone in your rating territory before any of your personal factors are considered. Insurance pricing is analyzed at a fine geographic grain, down to the first three characters of a postal code combined with city, which means two houses a few streets apart can sit in different pricing territories. A territory-wide increase and an increase caused by your own claim look identical on a renewal notice. Only one of them is negotiable, and the document does not distinguish between them.

• Knowable: your total premium change, every coverage and limit on the declaration page, your deductibles, and what a competing insurer will quote for the same property.
• Knowable if you ask: which endorsements changed in price, and whether the insurer applied a general increase to your area.
• Not disclosed anywhere: the approved base-rate change for your territory, the hazard score your address received, and how much of the increase recovers reinsurance costs rather than expected claims.

That third category is larger than most homeowners assume. The research behind Mounting Costs estimated that each additional dollar of catastrophe loss required Intact to raise premiums by about $1.78 to hold profits and costs stable, and that just over half of the company's catastrophe losses in 2024 were passed to reinsurers. A meaningful share of what you are charged is therefore funding the cost of the insurer's own insurance — a line item no renewal notice has ever itemized.

Endorsements Are Where the Increase Usually Hides

The coverages most exposed to climate risk are the optional ones, which is precisely why they move at renewal. The Insurance Bureau of Canada notes that damage from backed-up sewers and drains is typically not covered by a standard policy, though optional sewer-backup coverage is offered by most insurers, and that overland flooding is likewise excluded from a standard policy while optional residential overland flood coverage is now available for the majority of homes, priced on risk and often bundled with sewer backup. Because these are separately rated add-ons, a large increase can land entirely inside them while the base policy barely moves — or the reverse.

Reading the endorsement lines against last year's declaration page is the closest a homeowner can get to auditing their own rate change. It is also a reasonable first step before working through the broader set of levers that influence what Canadians pay for home coverage.

Prices are only the visible symptom. The deeper asymmetry is in the risk data that produces them, and here the numbers are stark. Mounting Costs reports that only 6 per cent of Canadians living in a flood zone are aware that they live in one, and only one in five people have reviewed community flood maps. Statistics Canada independently arrived at the same 6 per cent figure, alongside an estimate that more than 1.5 million households — roughly 10 per cent of all households in Canada — are highly exposed to flooding. Flood is the most frequent extreme weather event in the country, and the overwhelming majority of the people most exposed to it do not know they are.

The reason is not secrecy for its own sake. Detailed hazard mapping is a commercial product. Insurers that have purchased access to proprietary risk databases know the full extent of the risk attached to an address; homeowners, municipalities and developers do not, which is how new housing continues to be approved in flood-prone areas. That is the same complaint an earlier submission put to Ontario's regulator, which asked it to consider publishing home rate changes as it does auto changes and to make the climate risk data insurers use for pricing publicly available, noting that the flood mapping consumers can currently access is frequently out of date. Environmental Defence's version of the ask is that governments publish current hazard maps so households have the same information about their own homes that their insurer already holds.

The practical effect on a homeowner is narrow but real. Without an authoritative public map, you cannot tell whether an overland water endorsement is priced for your street or for your postal code, and you cannot challenge a classification you are not allowed to see. It also means that optional flood coverage remains a decision made without the underlying risk information, which goes some way to explaining why uptake stays low even where exposure is high.

The pressure behind all of this is not projected to ease. Statistics Canada's own accounting shows the long-run shift clearly: Canadian insurers averaged roughly $400 million a year in catastrophe losses between 1983 and 2008, and since 2009 the annual average has risen to nearly $2 billion, with the effects concentrated in personal property rather than in automobile or commercial lines. Mounting Costs extends the trend forward, noting that average annual insured catastrophic losses between 2015 and 2024 ran about 10 times higher than the pre-1994 level and more than double the level of a decade earlier, and extrapolating from Swiss Re data that Canadian insured catastrophe losses could reach $25 billion by 2050.

The property-versus-auto skew that motivates the whole comparison also continues past the report's 2008 to 2024 study window. In Intact's second quarter of 2026, Canadian personal auto catastrophe losses were $6 million against $252 million in personal property, a ratio of better than forty to one. The line absorbing the losses is the line nobody has to report on.

Two things are worth tracking from here. The first is whether any provincial regulator separates disclosure from rate approval, since nothing prevents a regulator that cannot set home insurance prices from requiring that changes to them be published. The second is the report's own caveat, which deserves as much attention as its headline: Environmental Defence acknowledges that escalating personal property premiums are not attributable to severe weather alone, and names general inflation, higher reinsurance costs and increasing housing density in high-risk areas as additional drivers. That admission matters. It is also, unavoidably, an estimate built from two companies' filings, and it will stay an estimate until the data behind the other 298 insurers becomes something the public is allowed to see. In the meantime, the market keeps repricing through deductibles and coverage limits rather than through headline premiums, which is the one form of increase that never shows up as a rate change at all.