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How Much Does Basement Underpinning Cost in Toronto in 2026?

Last updated: By ConcreteFinder Research Team

Basement underpinning costs about $350 to $480 per linear foot of foundation for the structural work alone, or roughly $80 to $100 per square foot turn-key including engineering, permits, waterproofing and a new slab, according to Strong Basements and Capable Group. A full GTA project typically runs $50,000 to $100,000. Bench footing is 30 to 40 percent cheaper but sacrifices floor space.

What does underpinning, bench footing and foundation repair cost?

ConcreteFinder compiled this table from 10 named Canadian sources; where they disagreed, we widened the range rather than pick one.

Researched July 2026. CAD, sources named per row. Add 13% HST unless noted.
ItemTypical rangeUnitSource
Basement underpinning - structural work only$350–$650(typ. $400–$480)per linear footStrong Basements
Basement underpinning - turn-key project (engineering, permits, waterproofing, plumbing, new slab)$50–$105(typ. $80–$100)per sq ftStrong Basements (low end: Nusite Group)
Full-basement underpinning - total project cost$50,000–$120,000(typ. $60,000–$90,000)per projectCapable Group Inc.
Bench footing (basement lowering alternative)$75–$400(typ. $250–$350)per linear footCSG Renovation (high end: Strong Basements)
Bench footing - priced by floor area$35–$60(typ. $40–$55)per sq ftNusite Group
Foundation crack repair - polyurethane injection (leaking crack)$500–$1,000(typ. $600–$900)per crackDryShield Water Solutions
Foundation crack repair - structural epoxy injection$800–$2,500(typ. $1,000–$1,800)per crackDryShield Water Solutions
Exterior foundation waterproofing (excavated)$140–$300(typ. $180–$250)per linear footDryShield Water Solutions
Screw pile / helical pier underpinning$3,000–$5,000(typ. $3,500–$4,500)per pileCapable Group Inc.
Structural engineering drawings for underpinning permit$1,500–$6,000(typ. $2,000–$5,000)per projectStrong Basements (corroborated by SEPCO Engineering $1,500–$4,000+)
Structural engineer hourly rate (Toronto/GTA)$150–$300(typ. $200–$250)per hourSEPCO Engineering
Structural engineer site inspection / assessment$600–$1,200(typ. $700–$1,000)per visitSEPCO Engineering
City of Toronto building permit - underpinning (direct city fee)$214.79–~$400(typ. under $400 for a standard house)per permit ($12.37/linear metre, $214.79 minimum, 2026)City of Toronto Building Permit Fee Schedule
Permits + engineering as bundled by contractors$2,000–$5,000(typ. $2,500–$4,000)per projectNusite Group

What drives the price?

Not every quote is the same job. These are the variables that move underpinning pricing most in Toronto, so you can read a quote and see where the money goes.

  • Depth of lowering - each additional foot of dig increases excavation, concrete, and shoring cost
  • Linear footage of perimeter, including party walls on semis and row houses
  • Foundation type: rubble-stone and block foundations cost more to underpin than poured concrete
  • Soil conditions - clay/silt soils (most of Toronto) trigger mandatory professional field review and slower staged digging
  • Site access: mid-block semis with no side yard require hand-digging and conveyor soil removal
  • Underpinning method: mass concrete $300–$900/LF vs beam-and-base $450–$1,000+/LF vs screw pile $3,000–$5,000/pile (Capable Group)
  • Bench footing instead of underpinning saves 30–40% but sacrifices roughly 2 ft of floor space around the perimeter
  • Add-ons while the floor is open: interior weeping tile ($80–$150/LF), sump pit, backwater valve, lowered plumbing stack ($2,000–$10,000), new slab
  • Finished vs unfinished basement - demolition and refinishing add cost on both ends
  • Winter work: cold-weather concrete protection (hoarding and heating) adds cost December–March
  • Adjacent structures: underpinning below a neighbour's footings requires extra engineering and monitoring

What's specific to Ontario and Toronto?

Ontario rules and Toronto's climate change the math in ways national price guides miss. Here is what applies locally, from HST to permits to freeze-thaw.

  • A building permit is mandatory for all underpinning in Toronto. Drawings must be prepared and sealed by a licensed Professional Engineer (P.Eng), submitted as PDFs with a completed Assumption of Responsibility for Engineering Content form, and must show the proposed underpinning depth, site plan, and structural details (City of Toronto residential underpinning guide).
  • Ontario Building Code requires professional design AND field review (engineer site visits during construction) whenever the new foundation goes below the footings of an adjacent building within the soil's angle of repose, the underpinning exceeds 1,200 mm of laterally unsupported height, or the soil is clay or silt - which covers most Toronto lots.
  • City of Toronto 2026 fee schedule (effective Jan 1, 2026): underpinning is billed at $12.37 per linear metre with a minimum permit fee of $214.79; residential interior alterations are $11.53/sq m. The 2025 rates were $11.89/lm and $206.53 minimum.
  • HST at 13% applies to the full contract (labour and materials) for renovation work; there is no general HST rebate for basement underpinning on an existing home.
  • Semi-detached and row houses: underpinning a shared party wall requires engineering that addresses the shared footing and coordination with - often written agreement from - the adjoining owner; this is a common cause of quote premiums in older Toronto neighbourhoods.
  • Adding a separate basement entrance/walkout during underpinning (common for legal secondary suites) adds its own permit scope and may trigger zoning review; Toronto publishes a separate application guide for basement entrances.
  • Winter pours: concrete placed below 5°C requires CSA A23.1 cold-weather protection (heated enclosures), adding cost from roughly December to March, though because underpinning happens under the house it is less season-bound than exterior foundation work.
  • GTA clay-rich soils swell when wet and shrink when dry, and freeze-thaw cycles widen existing cracks; Ontario Foundations notes early crack repair typically costs 50–70% less than repair after several winters.

How can I pay less?

You can keep underpinning costs down without cutting the parts that matter. These are the levers GTA homeowners actually use, each tied to a real number above.

  • Get at least three itemized quotes broken out per linear foot with identical scope (depth, waterproofing, slab, plumbing) - the spread between GTA contractors on the same job routinely exceeds $20,000.
  • Consider bench footing where full ceiling height isn't needed along every wall: at $35–$60/sq ft vs $50–$100+/sq ft turn-key underpinning, it runs 30–40% less (Nusite Group).
  • Bundle waterproofing, interior weeping tile, sump, backwater valve, and plumbing-stack lowering into the underpinning contract while the floor is already open - retrofitting any of these later costs far more.
  • Ask that the City permit fee be passed through at cost: the direct 2026 Toronto fee is $12.37/linear metre (minimum $214.79), a few hundred dollars - not the $2,000–$3,000 some contractors bundle as 'permits'.
  • Toronto's Basement Flooding Protection Subsidy offers up to $3,400 toward a backwater valve, sump pump, and downspout/foundation-drain disconnection - timing this with underpinning captures the subsidy while excavation is open.
  • Repair foundation cracks early: a $500–$1,000 polyurethane injection now beats a $2,500 structural epoxy repair or excavated exterior fix ($140–$300/LF) after freeze-thaw cycles widen the crack.
  • Schedule the pour for spring–fall where possible to avoid winter hoarding and heating surcharges on concrete work.

How did we research these numbers?

Every price on this page comes from a named Canadian source, and where sources disagreed we widened the range rather than pick a favourite. Here is how ConcreteFinder reconciled the numbers.

  • Bench footing quotes conflict widely across GTA sources: VMB Group publishes $75–$150/linear ft and CSG Renovation $50–$250/linear ft, while Strong Basements lists $300+/linear ft and other contractors quote $270–$650/linear ft. Low quotes typically cover the concrete bench only, not excavation, soil disposal, or waterproofing. The range was widened to $75–$400 to reflect this; get itemized scope before comparing.
  • Underpinning is quoted two ways: per linear foot of foundation wall for the structural work alone ($350–$480/LF market consensus per Strong Basements), and per square foot of basement floor area for turn-key basement-lowering ($80–$100/sq ft). Comparing a per-LF structural quote against a per-sq-ft turn-key quote is the most common homeowner error.
  • VMB Group's published $80/linear ft low end is a significant outlier against the $350–$480/LF consensus from Strong Basements and Capable Group ($300–$900/LF mass concrete); treat sub-$300/LF quotes as partial scope.
  • Contractor 'permit' line items of $2,000–$3,000 bundle engineering drawings, application preparation, and expediting. The direct City of Toronto fee is only $12.37 per linear metre with a $214.79 minimum (2026 schedule) - typically under $400 for a standard house.
  • Real published Toronto project totals from Strong Basements: $62,900 for a 600 sq ft basement shell; $88,132 (787 sq ft semi-detached), $117,859 (1,100 sq ft Cabbagetown Victorian), and $120,571 (1,500 sq ft Etobicoke bungalow), all including HST.
  • All figures are in CAD from Canadian (Toronto/GTA/Ontario) sources published December 2024 through April 2026. US cost guides (Angi, Today's Homeowner) appeared in search results but were excluded rather than converted.
  • Most contractor quotes exclude 13% HST; confirm whether a quote is pre- or post-tax before comparing.

Sources

Who can do the work?

ConcreteFinder tracks 155 foundation contractors across the Greater Toronto Area, rated 4.86★ on average. The three below rank highest on our review-weighted score, based on ConcreteFinder's analysis of 155 GTA businesses, July 2026.

See all 155 foundation contractors on ConcreteFinder

Frequently asked questions

How much does basement underpinning cost per linear foot in Toronto?

For the structural work alone, the 2025–2026 Toronto market rate is about $350–$480 per linear foot, rising past $600 for crawlspaces (Strong Basements). Method matters: mass concrete runs $300–$900/LF and beam-and-base $450–$1,000+/LF (Capable Group). Quotes below $300/LF usually exclude excavation, waterproofing, or the new slab.

What does it cost to underpin an entire Toronto basement?

Budget $50,000–$100,000 for a typical GTA house, or roughly $80–$100 per square foot turn-key including engineering, permits, waterproofing, plumbing, and a new slab. Real published Toronto examples range from $62,900 for a 600 sq ft shell to $120,571 (with HST) for a 1,500 sq ft Etobicoke bungalow.

Is bench footing cheaper than underpinning?

Yes - typically 30–40% cheaper. Bench footing runs about $35–$60 per square foot versus $50–$100+ for turn-key underpinning (Nusite Group). Per linear foot, quotes range $75–$400 depending on scope. The trade-off: the concrete bench eats roughly two feet of floor space around your basement perimeter.

How much does foundation crack repair cost in Toronto?

A polyurethane injection for a leaking, non-structural crack costs about $500–$1,000; structural epoxy injection runs $800–$2,500 per crack depending on length and severity (DryShield). If exterior excavation is needed, expect $140–$300 per linear foot. Finished basements and hard-to-access cracks push prices higher.

How much is a Toronto building permit for underpinning?

The direct City of Toronto fee is small: $12.37 per linear metre with a $214.79 minimum on the 2026 schedule - usually under $400 for a standard house. Contractors typically quote $2,000–$3,000 for 'permits' because that bundles engineering drawings, application preparation, and expediting.

What does a structural engineer cost for underpinning?

Stamped underpinning drawings for the permit typically cost $2,000–$5,000 in Toronto, with complex cases (rubble foundations, tight adjacent structures) reaching $6,000+. GTA structural engineers bill $150–$300 per hour, and a one-off site inspection with a letter runs $600–$1,200 (SEPCO Engineering). Field review visits during construction are usually mandatory.

Can underpinning be done in winter in Toronto?

Yes - the digging happens under the house, so underpinning is less season-bound than exterior foundation work. But concrete poured below 5°C needs heated enclosures and cold-weather protection, which can add several thousand dollars between December and March. Typical project duration is 4–10 weeks regardless of season.

Do I need a permit and engineer to underpin in Toronto, or can I skip them?

You cannot skip either. Toronto requires a building permit with P.Eng-sealed drawings, and Ontario Building Code mandates professional field review when soil is clay or silt (most of Toronto) or digging goes below a neighbour's footings. Budget $2,000–$5,000 for engineering plus the city fee of $12.37 per linear metre.

Questions to ask your contractor

  • Will you provide stamped engineering drawings and pull the building permit? Engineering and permit cost benchmarks
  • Is this underpinning or bench footing, and why is that right for my house?
  • How do you protect the existing structure and the neighbours during excavation?
  • What waterproofing and drainage go in while the foundation is open?
  • What is the inspection schedule, and who books the city inspections?

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