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Flood Restoration

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Clean up and restore a home after a flood or sewer backup. Tell us about your flood restoration project and we’ll help you find local restoration companies who serve your area.

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Flood restoration is the cleanup and recovery of a home after a flood event: a river or lake spilling over in spring, runoff from a sudden storm pouring through basement windows and cracks, or a municipal sewer that backs up into floor drains when the system is overwhelmed. Unlike a burst pipe, a flood almost always brings dirty water, often hits a whole street or town at once and can leave a house without power, heat or safe water for days.

A flood restoration company works through the recovery in order: confirming the house is safe to enter, pumping out water and mud, tearing out soaked materials, cleaning, drying the structure and documenting every step for your insurer. After a regional flood, crews, equipment and adjusters are stretched thin, so knowing what each step involves helps you make sound decisions under pressure.

This page covers flood-specific safety, what has to come out after contact with floodwater or sewage, how drying is proven, insurance and government assistance after overland flooding, and how to protect the basement before the next storm. For leaks from pipes and appliances, see our water damage restoration page.

Going back into a flooded home: power, gas, wells and structural safety

Get Prepared advises not returning home until authorities say it's safe, because flood-damaged buildings may be structurally unsafe. Once you're allowed back, electricity is the main danger. Ontario's Electrical Safety Authority says not to enter a basement where the water is above the outlets, baseboard heaters or furnace, or near the electrical panel, and to have the local utility disconnect the power. It then advises hiring a Licensed Electrical Contractor to check the system and decide whether the utility can restore service. In Quebec, Hydro-Québec's rules for flooded installations apply, as explained on our water damage restoration page.

  • Don't use electrical devices that have been in contact with floodwater, as the Electrical Safety Authority warns; the furnace and water heater also need a qualified technician's check.
  • If you smell gas, leave the house and call your gas utility from outside, and never relight or reconnect gas equipment yourself.
  • Don't switch on a private well pump: Get Prepared warns of a shock risk and advises having a certified well contractor inspect the well and its wiring first.
  • If sewage was involved, Health Canada advises contacting your local public health department, and anyone standing in the water should wear rubber boots.

Flood water extraction, mud removal and moisture mapping in a flooded basement

In a flooded basement, extraction means more than water. Floodwater leaves mud and silt behind, and it has to be shovelled and washed out before any drying can start. When the ground outside is still waterlogged, crews usually lower a deep flood in stages rather than all at once, since pressure from saturated soil can push on foundation walls once the water inside is gone.

Moisture mapping is how a crew proves the house is dry. The technician sketches each affected room, takes readings in drywall, framing, subfloor and concrete, marks the wet zones and repeats the readings through the drying period, comparing them with unaffected parts of the house. Concrete slabs and block walls hold a lot of water and give it up slowly, which is why a flooded basement often needs longer drying than a leak upstairs. Health Canada recommends professional help when floodwater has reached wall, ceiling or floor cavities that ordinary methods can't dry out.

What must be removed after floodwater or sewage contact

Floodwater picks up sewage, fuel, farm and road runoff and debris on its way in, so everything it touched is treated as contaminated. Health Canada's flood clean-up advice is to remove and discard water-soaked flooring, to take out finished walls completely if the water was several feet high or the walls stayed wet for 48 hours or more, and to dispose of furniture and household items exposed to floodwater that can't be dried.

  • Finished basement walls: drywall, insulation and vapour barrier come out so the cavities and the foundation can dry and hidden mud can be cleaned away.
  • Flooring: carpet, underpad, laminate and engineered wood soaked by floodwater are discarded, and subfloor panels that swell or delaminate are replaced.
  • Contents: submerged mattresses, upholstered furniture, cardboard, paper and stuffed toys generally can't be made safe again.
  • Food and medication: throw out anything floodwater touched, since Get Prepared advises taking steps to protect your household from food-borne illness.
  • Hard surfaces: concrete, tile, metal and solid framing are usually cleaned with soap and water and dried, and Health Canada notes bleach isn't necessary to clean up mould.

Flood insurance claims: overland water, sewer backup and what to record

A flood claim turns on how the water got in. The Insurance Bureau of Canada describes flood coverage and sewer backup coverage as optional additions to a home policy, so a basement filled by a rising river and one filled through a floor drain can be handled very differently. Ask your broker which coverage applies before you sign a restoration contract.

The Insurance Bureau of Canada also notes that your policy requires you to act to limit further damage. During a regional flood the adjuster may be days away, and pumping and tear-out can't wait that long, so the answer is to document as the work goes.

  • Photograph the waterline on walls, furniture and appliances in every room before pumping or tear-out begins.
  • Keep a small cut sample of soaked carpet, underpad or flooring, with a photo, so the adjuster can confirm the material.
  • Note the make and serial number of flooded equipment such as the furnace, water heater, washer and dryer.
  • Ask the restoration company for dated photos, moisture maps and an equipment log, which support both the claim and any assistance application.

Provincial flood assistance: Ontario's DRAO and Quebec's general disaster program

Quebec's General Financial Assistance Program Regarding Disasters covers owners and tenants of a principal residence after flooding from torrential rain, ice jams or snowmelt. It is last-resort help: Québec.ca says to contact your insurer before applying, to identify yourself as a disaster victim with your municipality, and to keep receipts and photos of the damage. A sewer backup or water infiltration qualifies only when a nearby watercourse overflowed, and households whose insurance covers the disaster aren't eligible.

In Ontario, Disaster Recovery Assistance for Ontarians opens only after a sudden natural event, such as a flood, that causes costly and widespread damage, and only in the areas where it has been activated. Eligible costs include cleanup, repairing or replacing essential property and basic emergency expenses such as evacuation travel. Other provinces run their own disaster financial assistance programs, so check your provincial emergency management website after a declared flood.

Preventing the next basement flood: backwater valves, sump pumps and grading

With walls open and floors bare, the rebuild after a flood is the easiest time to add protection. Pair the restoration with the upgrades that address how the water got in, and confirm with your insurer whether they affect your coverage.

  • Backwater valve: a one-way valve on the sewer line that closes when wastewater flows back; Get Prepared says it should be installed by a licensed plumbing professional, after checking local permit and inspection rules.
  • Sump pump with backup: Get Prepared recommends a licensed plumber to assess and install it, and notes that a battery- or generator-powered backup keeps working when the power goes out.
  • Upkeep: Get Prepared advises a full sump pump test once a year and cleaning a backwater valve at least twice a year to remove dirt and grease.
  • Grading and downspouts: soil that slopes away from the foundation and downspouts that discharge away from the house keep runoff out of window wells and cracks.
  • Rebuild choices: mechanical equipment raised off the floor, water-tolerant finishes and nothing valuable stored on the basement floor limit what the next flood can reach.

Flood Restoration: frequently asked questions

How soon should flood cleanup start?

As soon as authorities say the house is safe and the power has been dealt with. Health Canada notes a house and its furnishings are less likely to grow mould if dried within 48 hours, so photograph everything first, then start pumping and tear-out.

Is overland flooding covered by home insurance?

Only if your policy includes flood coverage, which the Insurance Bureau of Canada describes as optional. Sewer backup coverage is a separate option, so check both with your broker.

Should I pump out my flooded basement right away?

Not before the power is disconnected, and not all at once if the ground outside is still saturated. A restoration crew can lower the water in stages to reduce pressure on the foundation walls.

Can I clean up a flooded basement myself?

Shallow water with no sewage may be manageable once the electrical system is safe. Call a professional when sewage was involved, when water reached wall or floor cavities, or when the furnace, water heater or panel were submerged.

Does government disaster assistance replace flood insurance?

No. Ontario deducts insurance payments from eligible costs, and Quebec's program is last-resort help that asks you to contact your insurer first.

Sources

  1. Floods: how to prepare — Get Prepared, Government of Canada
  2. Flood safety — Electrical Safety Authority
  3. Flooding and electrical safety — Hydro-Québec
  4. Infographic: Flood clean up and indoor air quality — Health Canada
  5. Guide to addressing moisture and mould indoors — Health Canada
  6. Flooding and insurance — Insurance Bureau of Canada
  7. How to file a home insurance claim — Insurance Bureau of Canada
  8. Financial assistance for property owners and tenants after a disaster — Gouvernement du Québec
  9. Apply for Disaster Recovery Assistance — Government of Ontario
  10. Backwater valves — Get Prepared, Government of Canada
  11. Sump pumps — Get Prepared, Government of Canada

Written by the LokalMatch editorial team. Last reviewed September 10, 2026.

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What affects the cost of flood restoration

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Interior or exterior approach
  • Length of foundation wall to excavate or treat
  • Depth, soil conditions and access for equipment
  • Crack repair, underpinning or other structural work
  • Weeping tile, sump pumps and backwater valves
  • Restoring landscaping, driveways or finished basements
  • Testing and safe removal of mould or asbestos, where needed

How to compare restoration companies before you hire

  • Choose a contractor who finds the source of the water before recommending a fix, whether that's grading, eavestroughs, cracks or drainage.
  • Ask them to explain the difference between interior and exterior waterproofing for your home, and why they recommend one.
  • For foundation cracks that are wide, growing or uneven, ask whether a structural engineer should assess them first.
  • For mould, asbestos or radon, hire professionals qualified for that specific work, and don't disturb suspect materials yourself.
  • Get a written quote that lists excavation, membranes, weeping tile, sump pumps and restoration of landscaping or finishes.

Questions to ask restoration companies before you hire

  • Where do you think the water is coming from, and how did you confirm it?
  • Do you recommend interior or exterior waterproofing for my home, and why?
  • Should a structural engineer look at these cracks or this wall?
  • Does this work need a permit from my municipality?
  • Is your warranty transferable if I sell the house, and what does it cover?
  • How will you restore the landscaping, driveway or basement finishes afterwards?
  • If you find mould or asbestos, how will it be handled and by whom?

When to call a pro for flood restoration

  • Water on the basement floor or damp walls after rain or snowmelt
  • Foundation cracks that are growing, or walls that bow or lean, which should be assessed by a qualified professional
  • Musty smells or mould that keeps coming back
  • Suspected asbestos in insulation, flooring or pipe wrap: leave it undisturbed and call a qualified abatement professional.

Flood restoration permits and local rules

Some flood restoration work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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