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Best Foundation & Underpinning Contractors in Don Mills (2026)
Last updated: By ConcreteFinder Research Team
In the Don Mills area, ConcreteFinder counts 8 foundation contractors averaging 4.94★ on Google, drawn from 280 reviews collected for July 2026. A typical foundation contractor on this list carries 19 Google reviews, enough history to judge real workmanship, and our ranking weighs that volume, not just stars. There are no advertiser slots and no paid boosts here: the order is set by the data alone.
Which foundation contractors rank highest in Don Mills?
Below are all 8 foundation contractors ConcreteFinder tracks in Don Mills, ordered by a Bayesian-adjusted Google rating so consistent, high-volume reputations rise first. Each card opens a full profile and a free quote request.
- 1
2Verified listingTop ratedRCC Waterproofing Scarborough
Foundations & UnderpinningExperience the superior quality of RCC Waterproofing Scarborough, your go-to source for elite basement waterproofing solutions.
3Verified listingMaximum General Contracting
Foundations & UnderpinningMAXIMUM GENERAL CONTRACTING INC. Foundation Underpinning Specialist FAMILY OWNED & OPERATED SINCE 1998 Welcome to Maximum General Contracting Inc. Toronto Basement Lowering and Underpinning Specialists.…
4Verified listingTop ratedMaple Leaf Construction
Foundations & UnderpinningWelcome to Maple Leaf Construction - UNDERPINNING - WATERPROOFING - CONCRETE - Excellence from First Contact to Final invoice, and Beyond: Your Five-Star Construction Partner
5Verified listingTop ratedSDM Contractor
Foundations & UnderpinningSDM Contractor is one of the top concrete contractors in York. They emphasize the importance of high-quality concrete work, as it provides the foundation and structural support for any construction project. We as a company offer a variety of services to cater to the needs of their clients, ensuring that the quality of work meets or exceeds expectations.
6Verified listingTop ratedCity Wide Group
Foundations & UnderpinningProfessional basement waterproofing company Toronto and basement leak repair in Toronto since 1961. Choose The City Wide Group for professional waterproofing and underpinning in the GTA
7
8Verified listingLast King Construction.
Foundations & UnderpinningExperience Last King Construction expertise in action! We handle extensions, additions, walkout basements, underpinning, waterproofing, Interlocking, demolition, sump pump, heated driveways, concrete and more. Join us to see why we're the perfect fit for you next project.
How much does foundation and underpinning work cost in Don Mills?
Homeowners pricing foundation and underpinning work here can anchor on two line items: foundation crack repair - polyurethane injection (leaking crack) runs $500–$1,000 per crack (DryShield Water Solutions) and foundation crack repair - structural epoxy injection runs $800–$2,500 per crack (DryShield Water Solutions). In Don Mills, constrained access and haulaway often nudge quotes to the upper end. Add 13% HST before comparing quotes.
| Item | Typical range | Unit | Source |
|---|---|---|---|
| Exterior foundation waterproofing (excavated) | $140–$300(typ. $180–$250) | per linear foot | DryShield Water Solutions |
| Screw pile / helical pier underpinning | $3,000–$5,000(typ. $3,500–$4,500) | per pile | Capable Group Inc. |
| Structural engineer site inspection / assessment | $600–$1,200(typ. $700–$1,000) | per visit | SEPCO Engineering |
| Foundation crack repair - structural epoxy injection | $800–$2,500(typ. $1,000–$1,800) | per crack | DryShield Water Solutions |
| Permits + engineering as bundled by contractors | $2,000–$5,000(typ. $2,500–$4,000) | per project | Nusite Group |
| Foundation crack repair - polyurethane injection (leaking crack) | $500–$1,000(typ. $600–$900) | per crack | DryShield Water Solutions |
How does ConcreteFinder rank foundation contractors in Don Mills?
Every foundation contractor here is ranked by the same public formula: a review-volume-weighted Google rating plus small, checkable verification boosts. The median company here carries 19 Google reviews. That keeps the list of 8 honest, and no spot is ever paid for. Read our full methodology.
Frequently asked questions
How does ConcreteFinder rank foundation contractors in Don Mills?
- No, placement can't be bought. We rank the 8 Don Mills foundation contractors here by a Bayesian-adjusted Google rating (volume matters, not just stars) plus small verification boosts for a website, phone and photos. In Don Mills, 100% of rated companies clear 4.8★, so small gaps matter.
How many foundation contractors serve Don Mills?
- As of July 2026, 8 foundation contractors cover Don Mills, at an average Google rating of 4.94★ and a median of 19 reviews each. With that many local options, get three quotes and compare scope, not just price.
How far ahead do foundation contractors in Don Mills book up?
- In Don Mills, this is year-round work, since it happens indoors or below grade rather than on open ground. Good local foundation contractors book up in peak weeks, so request quotes with some lead time.
What should I budget for foundation and underpinning work in Don Mills?
- Basement underpinning - turn-key project (engineering, permits, waterproofing, plumbing, new slab) runs $50–$105 per sq ft across the GTA, per Strong Basements (low end: Nusite Group). Quotes there can sit at the higher end. Figures exclude 13% HST; our foundations & underpinning cost guide breaks down every line item for Don Mills.
How do I vet a foundation contractor in Don Mills?
- Before hiring, request a live WSIB clearance and a liability certificate, and verify the dates. ConcreteFinder surfaces verification signals on every Don Mills profile, yet the actual insurance paperwork should be confirmed with the foundation contractor first.
Do I need a permit to underpin a basement in Don Mills?
- Yes. Underpinning, bench footings and any structural foundation work in Don Mills need a building permit plus stamped drawings from a licensed Ontario structural engineer under the Building Code, and the city inspects in stages. That process is why an underpinning job is scoped very differently from flatwork, and because it is excavation work it runs year-round.
Questions to ask your contractor
- What is the inspection schedule, and who books the city inspections?
- How do you protect the existing structure and the neighbours during excavation?
- Will you provide stamped engineering drawings and pull the building permit? Engineering and permit cost benchmarks
- What waterproofing and drainage go in while the foundation is open?
Where else can you compare foundation contractors near Don Mills?
If none of the Don Mills shortlist suits, check foundation and underpinning work in adjacent areas or ConcreteFinder's other rankings nearby.
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