Last updated: By ConcreteFinder Research Team
4 foundation contractors currently serve Markham, averaging 4.97★ on Google across 94 combined reviews, per ConcreteFinder's July 2026 dataset. Roughly 100% of the field here publishes a working website, which we treat as one trust signal among several. As reviews accumulate, we update the order, so it stays current.
All 4 foundation contractors we track appear below in ranked order, with review volume weighed alongside the star average. Each card leads to a full profile and a free quote.
70/100 ConcreteFinder Score
7 reviews · 5.0
Markham
2 of 4 details on file · A foundation contractor working Markham, 7 Google reviews average 5.0★, posted working hours.
260/100 ConcreteFinder Score
49 reviews · 5.0
Markham
3 of 4 details on file · Markham foundation contractor, 49 Google reviews average 5.0★, posted working hours.
56/100 ConcreteFinder Score
38 reviews · 4.9
Markham
2 of 4 details on file · Listed for foundation contractor work around Markham, 38 Google reviews average 4.9★, posted working hours.
444/100 ConcreteFinder Score
1 reviews · 5.0
Markham
3 of 4 details on file · A concrete contractor working Markham, 1 Google reviews average 5.0★, also listed under concrete patios & walkways and foundations & underpinning.
For the area, our July 2026 dataset puts foundation crack repair - structural epoxy injection runs $750–$1,500 per crack (DryShield Basement Waterproofing (Toronto/GTA, 2026)) and exterior waterproofing, as part of a basement-lowering project runs $10,000–$15,000 per project (Nusite Group (Toronto underpinning contractor)). Pricing across Markham usually lands near the GTA midpoint. Those ranges exclude 13% HST.
| Item | Typical range | Unit | Source |
|---|---|---|---|
| Structural engineer site inspection / assessmentOpen-ended at the top: SEPCO writes $600 to $1,200+. Covers a site visit, assessment and an optional letter or report. | $600–$1,200+ | per visit | SEPCO Engineering |
| Structural engineer hourly rate (Toronto/GTA)An hourly consultation rate for advice only. SEPCO puts Toronto and the GTA at the top of the provincial band, $150 to $300 per hour, for highest demand and fastest turnaround. | $150–$300 | per hour | SEPCO Engineering |
| Foundation crack repair - structural epoxy injectionDryShield's epoxy tier, for bonding structural cracks where strength restoration is the goal. Same floor as polyurethane, higher ceiling. Neither the $800 floor nor the $2,500 ceiling this guide used to show is on their page. | $750–$1,500 | per crack | DryShield Basement Waterproofing (Toronto/GTA, 2026) |
| City of Toronto minimum building permit fee (2026)A floor, not a range, and not the whole permit cost. The City charges $214.79 minimum on all work in 2026 and then calculates the permit as a service index times floor area; examination and inspection time is $92.79 an hour. Engineering, drawings, revisions and plumbing permits are extra. | $214.79–$214.79 | per permit (minimum; underpinning is charged per linear metre on top) | City of Toronto Building Permit Fee Schedule |
| Structural engineering drawings for underpinning permitStrong Basements' Toronto figure for the engineer to design the underpinning around the home's structure and soil and produce a drawing set for the permit application and construction. Some design-build firms fold it into a project package instead of billing it separately. Neither the $1,500 floor nor the $6,000 ceiling this guide used to show is on their page. | $2,000–$5,000 | per project | Strong Basements (Toronto) |
| Underpinning a 1,000 sq ft basement lowered by 2 feet (total project)Nusite's worked example at their own $50 to $80 per square foot underpinning rate, over a four to ten week timeline. Permits, engineering, waterproofing, plumbing and finishing are all priced on top. | $50,000–$80,000 | per project | Nusite Group (Toronto underpinning contractor) |
Every foundation contractor here is ranked by the same public formula: a review-volume-weighted Google rating, what the company states on its own site, and the state of its record. The median company here carries 38 Google reviews. That keeps the list of 4 honest, and no spot is ever paid for. Read our full methodology.
An honest Markham quote names the prep, mix and thickness, reinforcement, finish, joints and disposal, then deposit, stages and warranty. If a bid is a single lump sum with no breakdown, ask for the itemized version before you sign.
Markham rankings are not paid. The 4 companies here are ordered by a review-volume-weighted Google score and light verification checks, and no one can pay to move up. Full details live on our methodology page.
Always. Lowering a basement by underpinning or bench footing is structural: it needs a building permit, stamped engineering under the Ontario Building Code, and staged municipal inspections. Expect a longer, controlled Markham schedule than flatwork, though the below-grade nature means it is not limited to the pour season.
For Markham, one July 2026 benchmark: basement underpinning - turn-key project (engineering, permits, waterproofing, plumbing, new slab) runs $80–$100 per sq ft in the GTA (Strong Basements (low end: Nusite Group)). Quotes there usually track that GTA range. Add 13% HST, and see the full foundations & underpinning cost guide.
In Markham, 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.
Yes. A free on-site estimate is standard among local foundation contractors. ConcreteFinder lists the Markham companies with their public phone number and website, so you can line up two or three visits yourself and compare scope side by side.
Not finding the right Markham fit? Browse foundation and underpinning work in nearby areas, or compare other ConcreteFinder service rankings in the area.
No obligation. We match you with exclusive, local pros, so you compare and choose.