How much does underpinning cost in Toronto?

Underpinning and basement-lowering permits in Toronto, priced from declared construction values — plus how long the permit takes, where the work concentrates, and what else lands in the same job.

1,361 permits with a declared value, trailing 36 months. Medians and quartiles only — one outlier can't move them.

Measured from the date the application was filed to the date the permit was issued, on permits that reached issue. It excludes the design and engineering time before filing, which is usually the longer half of the wait.

Counts are primary permits only — the plumbing, drain and HVAC permits filed alongside the same job are excluded so one project counts once.

Grouped by the first two characters of the postal code, so these are broad districts rather than neighbourhoods. See the live map →

Share of these permits that also carry each scope. This is why quotes vary so widely — the same word can describe a standalone job or one line inside a much larger renovation.

We publish a per-square-foot rate only where floor area is what the price actually scales with. For this work the correlation between area and declared value is 0.56 — too weak for a rate to predict your project. Multiplying your floor area by a published $/SF number would produce a confident-looking figure that the underlying permits do not support, so we show the value distribution instead.

• Linear metres of wall underpinned and the depth of each pin — price is quoted per pin or per linear foot, and both scale with how far down you go.
• Soil conditions and water table — dewatering and shoring change the job entirely.
• Whether the scope includes a new slab, drainage and waterproofing (it usually does).
• Access: a semi-detached with no side entrance means every bucket comes out through the house.
• Bench footing instead of true underpinning — cheaper and faster, but it eats floor area, so the two are not interchangeable quotes for the same result.

Declared construction values on City of Toronto building permits (tier C), trailing 36 months, minimum 12 permits before a guide is published. A declared value is what the applicant stated the work is worth — it can sit below final hard cost, which is exactly why GROUND also publishes awarded contract prices.

Underpinning is the most common way a basement second suite becomes legal, so these projects frequently overlap with suite permits. Every underpinning job needs a structural engineer's drawings before permit, and the declared values here include that design work.

Data: Open Government Licence — Toronto. Recomputed automatically as new permits land; the figures above are current as of October 05, 2026.

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