Flood and storm insurance when downsizing in Ontario

Insurance is a quiet line in a downsizing budget. You may be leaving a house you have insured for decades and moving to a condominium, a townhouse or a smaller house in a different part of the province. The hazards at the new address are not the ones you know. This page is general information, not insurance advice. A licensed insurance broker or your insurer can tell you what applies to a specific policy and address.

What a standard home policy usually covers and leaves out

The Insurance Bureau of Canada (IBC), the industry association for property and casualty insurers, describes the pattern this way. Standard policies cover sudden or accidental water damage from indoor plumbing, appliances and broken water mains. Overland flooding is typically not covered. Storm surge is typically not covered either. Policies differ by insurer and by year, so treat this as a starting list of questions rather than a guarantee about your own coverage.

Source: Insurance Bureau of Canada, flood and water pages, 2026. Wording in your policy governs.

Overland flood and sewer backup coverage in Ontario

Overland flood and sewer backup are separate ideas that people often lump together. Overland flooding is water entering from outside, from a swollen creek, a lake or heavy runoff. Sewer backup is wastewater coming up through a floor drain or toilet. The IBC says many insurers offer optional overland flood coverage, based on the risk at the address, and that it is often bundled with sewer backup. Because it is optional, it only helps if it is on the policy before the loss.

Three questions are worth putting to a broker in plain words. Is overland flood coverage available at this address, and at what limit and deductible? Does the sewer backup endorsement cover the contents of the basement as well as the structure? And is there a cap that is lower than the overall dwelling limit? Ask for the answers in writing. If you plan to keep boxes and a freezer downstairs, the contents question matters more than it first appears.

Conservation authority flood maps and regulated areas

Ontario flood maps are created mostly by municipalities and conservation authorities, according to the province, and a federal mapping program has been running through March 2028. Conservation Ontario reports that conservation authorities have mapped about 22,000 kilometres of flood-prone areas, about 90 per cent of it along rivers and creeks. That is a useful reminder that river and creek flooding is the part best covered by maps. Lakeshore and storm surge exposure and urban basement flooding need separate questions.

To look up a property, find the conservation authority that covers the municipality through Conservation Ontario's find a conservation authority page. Then check that authority's mapping page or ask staff. Conservation authorities also regulate development in some of these areas under the Conservation Authorities Act, which matters if you plan to renovate or build an addition. The province explains the permit process on its permits under the Conservation Authorities Act page, and the province's floods page lists high lake levels and storm surge among the causes of flooding.

Two cautions. A map shows where regulated or mapped hazards are, not what an insurer will charge. And a property outside a mapped area can still have a wet basement from a failed sump pump or a blocked sewer lateral. Our regional pages, starting from where to downsize, link local conservation authority mapping where we confirmed it.

Ice storms, tornadoes and wind in Ontario

Wind, ice and tornadoes are the other side of the ledger. Which causes of loss are covered, and with what deductible, varies by policy, so confirm each one with your insurer.

Two recent events show the scale. The IBC reported that a March 2025 ice storm caused $342 million in insured damage across Ontario and Quebec, and that more than one million Ontario homes and businesses lost power. And on July 15, 2021, a tornado struck Barrie; the Northern Tornadoes Project rated it EF2 with estimated winds of 210 kilometres an hour. The Project also counted two days in 2021, July 15 and September 7, when Ontario had outbreaks of ten tornadoes. Neither event tells you what will happen at your address, but both belong in the picture when you compare a house with large trees against a condominium unit on an upper floor.

Power loss is its own planning issue. Ask your insurer whether the policy responds to spoiled food or temporary accommodation after a long outage, because wording differs. Forest fires are also part of the province's hazard picture in some regions; the province's forest fires page carries the fire map, the danger and restricted zones, and the reporting numbers.

What if an insurer will not offer coverage?

Sometimes a quote comes back with a decline or an unusually high price on flood or sewer coverage. We have not confirmed, from a source we could read, whether Ontario has any formal arrangement for residential property insurance when an insurer declines, and we will not guess either way. The Financial Services Regulatory Authority of Ontario (FSRA) regulates licensed sellers of property and casualty insurance, and its property insurance page is the place to start with questions about your options.

Practically, the safest sequence is to ask more than one broker, ask for the decline in writing, and ask each one what changes the answer. If the insurer names something specific, such as an item in the basement, ask whether fixing it would change the answer, and get that in writing too.

Insurance when you buy a condominium or townhouse

If you are moving into a condominium, two layers of insurance exist: the corporation's policy and your own. A status certificate, which anyone can request and which the corporation must deliver within 10 days for a fee of up to $100 including tax, includes insurance certificates, the reserve fund statement and any special assessments since the budget, according to the Condominium Authority of Ontario. Our buying a condo in Ontario guide goes through the certificate step by step. Ask your insurer what a unit policy has to cover given the corporation's deductible, and ask the corporation how a water loss from a neighbour's unit is handled.

A condominium also changes the hazard mix. A third-floor unit is not exposed to basement flooding, but it shares plumbing with others. For comparisons between housing types, see condo, townhouse or house.

A checklist to run before you remove conditions

• Identify the conservation authority and look at its flood or regulated-area mapping for the address.
• Ask at least one broker for a written quote that shows whether overland flood and sewer backup are included, with limits and deductibles.
• Ask the seller's side what water events the home has had, and read the seller disclosure guide so you know what a seller must and need not say.
• Check the age of the roof, the sump pump and any backwater valve, and whether the home inspection covers them.
• For a condominium, read the insurance certificate and the reserve fund statement in the status certificate.
• Keep your current policy until the closing date is firm, and arrange the new one to start on closing.

Build the answer into your numbers too. Insurance premiums, a possible sump or valve installation and a larger deductible all affect the monthly cost of the smaller home. Our costs and money page and the net proceeds calculator help with the sale side, and the older-home angle is covered in preparing an older home for sale.

If you are selling a house with a wet basement history

A seller does not have to disclose a patent defect, one a buyer or inspector can detect by reasonable observation, but must not conceal it, according to the Real Estate Council of Ontario (RECO). A seller must disclose a latent defect, which RECO defines as one that makes the property unfit for habitation or dangerous and that is generally not apparent on reasonable inspection. Whether a past flood or recurring seepage is a latent defect is a question for an Ontario real estate lawyer. Covering up evidence of water damage adds liability, so speak to a lawyer before you decide what goes in the listing.

Keep records of repairs, receipts and any claim history. They help the buyer, and they help you if a question comes up later.

Where to go next

For the full downsizing sequence, see the step-by-step downsizing guide. If you want to talk through a specific house or area, contact us. Messages go to real estate agents on the operating team at eXp Realty, so this is not a search of the whole market, and the agent can tell you what the local flood maps and past losses look like. For insurance specifics, a licensed insurance broker is the right person.