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WaterproofingIndex

Best Foundation Repair Contractors in Toronto and the GTA

Last updated: By Below-Grade Records Desk

83 foundation repair contractors listed across the Greater Toronto Area, compiled August 2026.

6,702 Google reviews · median 5★ · typical $750–$1,000 per crack (DryShield (Toronto)) · 81% of rated companies at 4.8★ or above · scheduling: interior work year-round; exterior excavation typically April to November

Ranking

Who ranks highest for foundation repair in the GTA?

  3. Otto's Masonry3

    Otto's Masonry

    83/100 WaterproofingIndex Score

    0.8 km from Leaside centre

    LeasideFoundation Repair
    • Says it is licensed
    • Says it is insured

    Its own website describes below-grade water work

    Request a quote
  10. GJ MacRae Foundation Repair10

    GJ MacRae Foundation Repair

    74/100 WaterproofingIndex Score

    4.9 km from Oakville centre

    OakvilleFoundation Repair
    • Says it is licensed
    • Says it has been going since 1975

    Its own website describes below-grade water work

    Request a quote
  15. Omni Basement Systems15

    Omni Basement Systems

    70/100 WaterproofingIndex Score

    No street address published

    Foundation Repair
    • Says it has been going since 2003
    • Says it is with Better Business Bureau

    Its own website describes below-grade water work

    Request a quote

83 companies are filed under foundation repair in the Greater Toronto Area, holding a median 5★ across 6,702 Google reviews. 78 of them describe this work on their own website; for the other 5 we go on the category Google files them under and say no more than that. Budget $750–$1,000 per crack for interior crack injection, poured concrete wall, polyurethane, the GTA figure DryShield (Toronto) publishes. Order comes from a published score out of 100: reviews, what a company states on its own site, and how complete its record is. Nobody buys a place on it.

Prices

What does foundation repair cost in the GTA?

DryShield (Toronto) puts interior crack injection, poured concrete wall, polyurethane at $750–$1,000 per crack. Concrete Crack Repair Pros (Toronto) prices interior crack injection, structural epoxy at $850–$1,500 per crack. Ontario charges 13% HST on top, and GTA contractors quote before tax. 8 line items are broken out below, each credited to the source that published it.

GTA foundation repair prices as published, August 2026. Every row names its source. Some of these prices are published by contractors this directory also lists. Those rows are marked. A company cannot buy a ranking position by supplying a figure.
ItemTypical rangeUnitSource
Interior crack injection, poured concrete wall, polyurethane (stops the leak)$750–$1,000per crackDryShield (Toronto)also listed in this directory
Interior crack injection, structural epoxy (rigid bond, for stable structural cracks)$850–$1,500per crackConcrete Crack Repair Pros (Toronto)also listed in this directory
Interior injection on one accessible leaking vertical seam, full program with access and prep$1,500–$3,000per crackLeaquida Waterproofing (Toronto)
Tie-rod hole sealing (form-tie holes in a poured wall)$75–$150per holeDryShield (Toronto)also listed in this directory
Exterior crack repair, excavation and membrane at the crack location$150–$250+per linear ftDryShield (Toronto)also listed in this directory
Exterior crack repair, whole job total (varies with depth and access)$5,000–$20,000+per jobDryShield (Toronto)also listed in this directory
Exterior foundation repair to stop a basement leak, depth and access dependent$100–$300per linear ftGamcon (Toronto)also listed in this directory
Carbon fibre straps, bowing wall reinforcement, installed$3,000–$8,000per wallToronto Basement Underpinning

Open the full foundation repair cost guide

Coverage

Which part of the GTA is the job in?

Pick the city or neighbourhood to narrow the list to companies working there. 3 areas have enough listed foundation repair contractors for their own ranked page, each built from that area's own listings alone.

Ranking

How is this ranking built?

Position starts with an adjusted Google rating, which weighs how many people reviewed a company as well as what they scored it, so a 5.0 resting on three reviews does not sit above a 4.8 resting on three hundred. Added to it: what each company states on its own website, read off the page and stored with the sentence it came from, and how complete and reachable its record is. 81% of the rated foundation repair contractors here reach 4.8★, so the gaps between neighbouring positions are narrow and worth reading. Positions move as new reviews land, and no company is told about it in advance. Read our full methodology.

Frequently asked questions

What does foundation repair cost in Toronto and the GTA?

DryShield (Toronto) publishes $750–$1,000 per crack for interior crack injection, poured concrete wall, polyurethane, and Concrete Crack Repair Pros (Toronto) publishes $850–$1,500 per crack for interior crack injection, structural epoxy. Those are pre-tax figures, so add 13% HST. The foundation repair cost guide on WaterproofingIndex sets out every line item beside the source that published it.

How do I pick a foundation repair contractor in the GTA?

Three written quotes, each naming the same wall and the same scope, is the only comparison that means anything below grade: one firm can price an interior drain while another prices an excavation, and the totals will not be comparable. The shortlist above is every foundation repair contractor on record here, 83 of them, sitting at a median 5★ on a median of 46 Google reviews apiece. Ask each one for proof of insurance and for two addresses within a few streets where it did the same job.

When can foundation repair be scheduled in Toronto?

Interior work year-round; exterior excavation typically April to November. Frozen ground is what fixes the calendar: anything needing an open trench waits for the thaw, while work done from inside the basement carries on all winter. Ask each quote which parts of its scope need the ground open, because that single answer decides your start date.

Do these jobs need a permit, and does the quote include HST?

Ontario charges 13% HST on plumbing and waterproofing work, and GTA contractors publish their ranges before tax, so add it before comparing. Permits follow the scope, not the price. The City of Toronto requires a building permit and an inspection for a backwater valve, and charges an underpinning permit fee for lowering a basement or cutting a new below-grade entrance. Where a permit applies, the foundation repair cost guide prices it as its own line with the City's own figure.

How do I check out a foundation repair contractor in the GTA?

Ontario does not license waterproofing or foundation repair, so there is no provincial registry to look anyone up in and a trade logo on the truck proves nothing on its own. What can be checked is concrete: ask for a WSIB clearance certificate in the company's exact legal name, ask the broker to send the certificate of insurance to you directly rather than accepting a PDF forwarded by the contractor, and confirm the coverage actually matches the work being quoted. Anything structural, such as bracing a bowing wall or rebuilding a section of it, is likely to need a permit and an engineer's drawings, which your municipality's building department confirms case by case.

Can a company pay WaterproofingIndex for a higher position?

No, and there is nothing to buy. The order comes from a published score out of 100: an adjusted Google rating, what a company states on its own website, and how complete its record is. With 81% of rated foundation repair contractors at 4.8★ or better, positions here separate on narrow margins. The methodology page sets out the formula.

Questions to ask your contractor

  • What is causing this, and what happens if it is left another year?
  • Is this a cosmetic repair or a structural one, and does an engineer sign the drawings?
  • Are you repairing, rebuilding a section, or bracing, and what rules out the other two? See what each approach costs
  • Who pulls the permit if this turns out to be structural work?
  • Which parts are your own crew, and which are subcontracted out?

Coverage

Where to go next

Below-grade problems rarely stay in one category. These are the other Greater Toronto Area rankings and guides on WaterproofingIndex.