How Much Does Underpinning Cost in Toronto in 2026?

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

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 gained is the biggest single driver. Toronto Basement Underpinning prices a 1 foot gain from a $200 per linear foot baseline, the common 2 foot gain at an average of $300, and a 3 foot gain at $450 per linear foot.
• Method chosen: full underpinning keeps the whole floor area, bench footing costs roughly 30 to 40 percent less (Nusite Group) but gives back 12 to 24 inches of floor width around the perimeter.
• Perimeter length, not floor size, sets the structural bill. Strong Basements' worked Toronto quotes ran 107.5, 130 and 160 linear feet on three different house types, at $475, $550 and $425 per linear foot respectively.
• Site access. Strong Basements attributes a $475 per linear foot rate on a semi-detached to increased manual labour from limited access, and a lower $425 rate on an Etobicoke bungalow to excellent machine access.
• Foundation age and type. The same source charges $550 per linear foot on a Cabbagetown Victorian row house, citing a deeper dig, a delicate foundation type and difficult access.
• Soil conditions and whether a geotechnical report is needed. Toronto Basement Underpinning puts a 2026 Toronto soil report at $3,500 to $8,000; RenoNext publishes $2,500 to $5,000 for a borehole investigation and soil report.
• Party walls and neighbour consent. Strong Basements' method table flags that a regular bench and an engineered bench do not require neighbour consent, while overpour, non-shrink and flash (L-shape) underpinning do.
• Bundled scope. Adding waterproofing during the dig costs $80 to $120 per linear foot instead of $150 to $250 later, and adding basement finishing runs $30,000 to $70,000 extra depending on finish level (Toronto Basement Underpinning).
• Whether services sit below the new floor. WillFix prices utility relocation at $9,000 or more per system, and every job needs the main drain, weeping tile and often the water service redone at the new depth.
• Steel posts and beams. Strong Basements prices a steel load post on a new concrete footing at $1,900 each, and notes recessed load-bearing beams are often installed at the same time to open up the plan.

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.

• HST at 13 percent is added on top of quoted prices and it is a large number on a job this size. Strong Basements' published Toronto sample quotes show estimated HST of $10,139 on a $77,993 shell, $13,559 on $104,300, and $13,871 on $106,700. Always confirm whether a quote is before or after tax.
• A City of Toronto building permit is required. The City's own Residential Underpinning page describes the service as a 'Building Permit for underpinning of the foundation of an existing house' and defines underpinning as 'a method of increasing the depth of an existing foundation by constructing new footings beneath the existing footings', adding that you may also underpin 'to reinforce an existing foundation or to add a below grade or partly below grade entrance to an existing house'.
• The City states when an engineer is mandatory: 'A foundation shall be designed and reviewed on-site by a Professional Engineer when it is constructed below the level of the footing of an adjacent building and within the angle of repose of the soil.' In that case the designs must be sealed by a Professional Engineer, the engineer must sign the Commitment to General Reviews form, and the completed form must be submitted with the permit application.
• Engineer involvement is not optional even on simple jobs. The City's page states: 'In all circumstances of underpinning, whether the underpinning was required to be designed by a Professional Engineer or not, you will be required (at the minimum) to provide testing and reports by a Professional Engineer during the first and last stages of the construction in order to pass inspections.'
• The permit fee is charged by wall length, not project value. The City lists 'Underpinning $12.37/linear metre' effective January 1, 2026, and its fee schedule states that a 'Minimum fee of $214.79 (2026) shall be charged for all work.' That is why the City requires your drawings to 'indicate the lineal metres of underpinning work proposed'.
• Toronto Building's online application service is now available for Residential Underpinning permits, and the City's page states that email submissions will continue to be available until August 17, 2026.
• Drawing requirements are specific and add engineering time. The City requires basement and foundation plans showing the staged sequence of the underpinning numbered in order of work, the distance to foundations of adjacent buildings including the depth of their footings, and a cross section showing the depth of underpinning proposed.
• Underpinning within the angle of repose of a neighbour's footing is the trigger that turns a routine job into an engineered one. The City warns that 'disturbing the soil anywhere within the angle of repose could lead to soil failure and result in serious and difficult to repair consequences.'
• A below-grade entrance is treated by the City under the same underpinning permit guide, so a walkout and a basement lowering can be permitted together. Toronto Basement Underpinning states that combining a walkout with underpinning saves $1,500 to $3,000 because excavation, concrete and permit work are partly shared.
• Ontario is at the top of the national range. RenoNext publishes $500 to $800 per linear foot for Ontario, and Toronto Basement Underpinning's province table lists Ontario (GTA) at $80 to $500 per linear foot with the note 'Highest labour rates, strictest permitting', against $60 to $350 for Alberta.

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.

• Price benching against underpinning before you commit. Nusite Group puts bench footing at $35 to $60 per square foot against $50 to $80 for underpinning, roughly 30 to 40 percent less, and the trade-off is about 15 percent of your floor area lost to the bench.
• Do the waterproofing while the trenches are already open. Toronto Basement Underpinning prices it at $80 to $120 per linear foot incrementally during underpinning, against $150 to $250 per linear foot as a standalone job later.
• Build the walkout in the same contract. Toronto Basement Underpinning states that doing the walkout after underpinning as a standalone project almost always costs $1,500 to $3,000 more, and that permit and drawings alone add $2,500 to $4,500 when the walkout is a standalone scope.
• Take one foot less than you want if the room already has some height. Going from a 1 foot gain to a 3 foot gain moves the rate from a $200 per linear foot baseline to $450 per linear foot (Toronto Basement Underpinning), and the perimeter length you are paying for does not change.
• Make every bidder price the same scope in writing. Compare structural rate per linear foot, engineering, permit handling, underfloor drains, waterproofing, the new slab and disposal as separate lines. Strong Basements warns that a low headline per-foot rate rarely includes the mandatory associated costs, which is where the sticker shock comes from.
• Check the permit line against the real City fee. Contractors publish permit fees of $2,000 to $3,000, but the City of Toronto charges $12.37 per linear metre with a $214.79 minimum. Ask what the balance buys and whether drawings are included in it.
• Ask whether a regular or engineered bench avoids a neighbour consent problem. Strong Basements' method table shows both bench types need no party-wall neighbour consent, while overpour, non-shrink and flash underpinning do, which can save weeks of delay on a semi or a row house.
• Find out early whether ducts, drains or the electrical panel sit below the new floor level. WillFix prices relocating each system at $9,000 or more, so this belongs in the first site visit, not in a change order halfway through.
• Leave the finishing out of the underpinning contract if the budget is tight. Underpinning to an unfinished shell is the structural spend; Toronto Basement Underpinning puts finishing at $30,000 to $70,000 extra and WillFix puts interior finishing at $10,000 to $30,000, and it can wait.

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 WaterproofingIndex reconciled the numbers.

• Published per-linear-foot rates for underpinning disagree more than in almost any other trade. Toronto Basement Underpinning publishes $80 to $500 per linear foot across project types, Strong Basements publishes $350 to $480, and RenoNext publishes $500 to $800 for Ontario. Every one of those numbers was read off the live page. Treat any single quoted rate as meaningless until you know the depth gained, the access, and what is bundled into it.
• Per-square-foot numbers spread the same way. Nusite Group publishes $50 to $80 per square foot for underpinning, WillFix publishes its own price at $50 to $100 with a Toronto market range of $70 to $150, Homi Reno publishes $70 to $150 across Ontario ($80 to $150 for Toronto specifically), and RenoNext publishes $80 to $160. Strong Basements' all-in figure of $80 to $100 per square foot covers the shell only, not finishing.
• The single most useful published worked example: Strong Basements prices a 600 square foot basement lowered by 2 feet at $62,900 all in, which it breaks out as engineering and inspections $6,600, city permits $1,000, plumbing and drainage with backwater valve and sump pump $6,400, a new concrete floor $9,000, and waterproofing $3,000, on top of 100 linear feet of underpinning at $350 per foot. The same page states that works out to about $105 per square foot.
• Bench footing pricing conflicts hard between sources. WillFix publishes a Toronto market range of $75 to $150 per linear foot for bench footings, while Strong Basements' method table starts a regular bench at $300 per linear foot and an engineered bench at $420. A separate, older Strong Basements page states that as of 2023 bench footing was around $300 per linear foot against $420 for underpinning. The per-square-foot comparison from Nusite Group ($35 to $60 for benching against $50 to $80 for underpinning) is the most internally consistent way to compare the two methods.
• Benching is cheaper but you pay for it in floor area, and sources disagree on how much. Strong Basements puts the space loss at 24 inches for a regular bench and 12 inches for an engineered bench, WillFix puts it at 12 to 18 inches per wall, and Nusite Group estimates roughly 15 percent of floor space lost, so a 1,000 square foot basement ends up with about 850 usable square feet.
• Contractors quote a 'permit fee' of $2,000 to $3,000 (Strong Basements and WillFix both publish that range) but the fee actually paid to the City of Toronto is far smaller. The City's own page lists underpinning at $12.37 per linear metre effective January 1, 2026, with a $214.79 minimum fee for all work. The rest of what a contractor calls a permit fee is drawings, application handling and inspection coordination.
• Waterproofing pricing inside an underpinning job is inconsistent between sources. Toronto Basement Underpinning puts the incremental cost at $80 to $120 per linear foot when done during underpinning, against $150 to $250 standalone afterwards. Strong Basements' itemized quote lists basement waterproofing at $30 per linear foot but also describes full weeping tile systems at $3,000 to $6,000 per project. Nusite Group publishes $5,000 to $15,000 for waterproofing overall. Get the scope in writing before comparing.
• Whole-project totals depend entirely on where the source draws the line. Toronto Basement Underpinning publishes $20,000 to $50,000 for underpinning alone on a standard detached home and explicitly excludes waterproofing, finishing and drawings. WillFix publishes $55,000 to $85,000 for a 500 to 800 square foot basement including excavation, footings, engineering and permits. RenoNext publishes $75,000 to $150,000 all in for a typical Toronto semi. Strong Basements' three worked Toronto quotes land at $88,132, $117,859 and $120,571 with HST.
• One source contradicted itself and the conflicting figure was not used. The Toronto Basement Underpinning walkout page contains a sentence stating walkout projects run $25,000 to $45,000, while its own pricing table, its cost breakdown section and its FAQ all state $8,000 to $18,000. Only the $8,000 to $18,000 figure was carried into the table above.
• Utility and service relocation is the line item homeowners miss. WillFix publishes $9,000 or more per system for relocating ducts, drains and electrical panels that sit below the new floor level, and notes it rarely comes up in early conversations. Strong Basements separately prices underfloor plumbing work at $3,000 to over $10,000.

Sources

• City of Toronto - Residential Underpinning building permit guide (permit requirements, engineer requirements, fee effective Jan. 1, 2026)
• City of Toronto - Building Permit Fees (underpinning $12.37/linear metre, $214.79 minimum fee, 2026)
• Strong Basements - REAL Basement Underpinning Cost Toronto + Calculator 2026 (itemized 600 sq ft quote and three worked Toronto sample quotes)
• Toronto Basement Underpinning - Basement Underpinning Cost in Ontario 2026 Guide (updated April 24, 2026)
• Toronto Basement Underpinning - Basement Walkout Toronto pricing page (updated May 4, 2026)
• Nusite Group - How Much Does Basement Lowering Cost? (underpinning vs bench footing per sq ft)
• WillFix - Basement Underpinning Cost in Toronto 2026 (component breakdown and totals by basement size)
• RenoNext - Underpinning Cost Ontario 2026 (updated June 2026)
• Homi Reno - Basement Underpinning Cost in Toronto 2026 Pricing (cost per sq ft by GTA city)
• Strong Basements - Basement Underpinning vs. Bench Footing methods in Toronto

WaterproofingIndex tracks 59 underpinning contractors across the Greater Toronto Area, rated 4.91★ on average. The three below rank highest on our review-weighted score, based on WaterproofingIndex's analysis of 59 GTA businesses, August 2026.

• 1

  Royal Work Basement Waterproofing Toronto

  5.0(452 Google reviews)

  0.2 km from Harbourfront centre

  HarbourfrontBasement Waterproofing

  Its own website describes below-grade water work

  (416) 837-1077Call
• 2

  SVD Restoration Concrete Contracting Inc.

  5.0(219 Google reviews)

  0.8 km from Mimico centre

  MimicoFoundation Repair

  Its own website describes below-grade water work

  (647) 559-5814Call
• 3

  BASEMENT WATERPROOFING - PLUMBER ON DEMAND

  5.0(207 Google reviews)

  No street address published

  Basement Waterproofing

  Its own website describes below-grade water work

  +1 888-449-7444Call

The table above is the market. These calculators put your own basement into it, and they add the HST and any City of Toronto subsidy that applies.

• Drainage at underpinned depth, priced separately
• Waterproofing while the hole is open