Toronto, ON · 757 permits
Basement Underpinning Cost in Toronto
Across 757 qualifying Toronto permits, the median declared construction value was $65,000. Half of declarations fell between $40,000 and $125,000. These are values applicants declared when filing permits between 2024 and 2026; project scope varies, and they are not contractor quotes or final spending. The sample covers permits that mention underpinning or lowering a basement floor.
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The Kildrin Estimator
Explore underpinning permit values for your property type
Property type and an optional postal code can narrow the permit sample. The result is not a quote or a prediction of final spending.
Only the first three characters are used.
Pick a property type to see the range. Across all 757 permits the median declared construction value is $65,000. Scope varies between declarations, and the record does not contain final spending.
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Request a quoteUnderpinning by property type
These are construction values declared in Toronto underpinning permits, not contractor quotes or final spending. Each row uses the same qualifying sample as the property-type dropdown above.
| Property type | Median declared value | Typical range | Permits |
|---|---|---|---|
| Detached house | $65,000 | $40,000 to $125,000 | 321 |
| Semi-detached | $60,000 | $30,000 to $120,000 | 237 |
| Duplex or triplex, detached | $80,000 | $50,000 to $150,000 | 71 |
| Duplex or triplex, semi | $50,000 | $26,500 to $107,500 | 34 |
| Converted or multi-unit building | $100,000 | $50,000 to $262,500 | 52 |
Typical range is the middle half of declared values for each property type. Property types without enough qualifying permits are omitted.
Planning to use the lowered basement as a separate dwelling? Review the basement apartment conversion page as a separate permit sample. The records do not support adding the two medians together as a combined-project budget.
Deciding between underpinning and benching? The underpinning vs benching guide compares cost factors, usable floor space and what both quotes should include. These permit figures do not separate the two methods.
What affects basement underpinning cost?
Depth, site access and the condition of the existing foundation can change the work a contractor proposes. These permit records do not consistently give the lowering depth or itemized scope, so they cannot establish a typical depth or a cost multiplier for lowering further.
Questions to compare in written quotes
- What finished ceiling height is proposed, and what engineering review is included?
- Which structural work, excavation, new slab and drainage are included?
- Who handles permits, inspections, waterproofing and finishing?
What the permit record does not tell us
The record provides one applicant-declared construction value, not an itemized scope or final invoice. For underpinning, it does not consistently show whether engineering, fees, waterproofing or finishing are included. Confirm each item in a written quote.
Compare the written scope before comparing totals. Use the Toronto renovation quote comparison guide to check allowances, exclusions, taxes, changes and project-specific work across competing quotes.
The Kildrin Quote Checker
Compare with declared permit values
Enter a quote to place it on the full Toronto sample of 757 basement underpinning permits. This does not use the property selection above or judge whether the quote is high or low.
- 25th percentile declared value
- $40,000
- Median declared construction value
- $65,000
- 75th percentile declared value
- $125,000
Half of these permit declarations fell between the 25th and 75th percentile values. Treat this as a description of the records rather than a price for your property.
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See how this compares across all categories. The Toronto Renovation Cost Report puts basement underpinning next to every other renovation category we publish — median declared value, sample size and the change against the previous two years, in one table.