Toronto's housing stock spans 1880s Victorian semis in Cabbagetown, Kensington Market, and Little Italy to Edwardian brick homes in Rosedale, The Annex, and Yorkville, to post-war detached homes in Old Toronto and East York. Every era needs a different underpinning playbook. Our crews work across Downtown Toronto, Old Toronto, and every neighbourhood from Roncesvalles, Parkdale, and High Park in the west to Leslieville, Riverdale, and The Beaches in the east, plus every street in between including Ossington, Queen West, King West, Bloor West, Danforth, and the Distillery District. Toronto Basement Underpinning delivers basement lowering, underpinning, interior waterproofing, basement finishing, sump pump installation, concrete foundation repair, legal apartment conversions, walkout basements, and permit coordination - full scope, one licensed crew.
A typical Toronto basement lowering runs $20,000-$50,000 depending on foundation depth, soil condition, and whether waterproofing and finishing are included in the same project. Every quote is fixed-price, includes engineered drawings and city permits, and is backed by our workmanship warranty.
Toronto Basement Underpinning serves basement lowering and underpinning across Toronto and the Greater Toronto Area, including Toronto, North York, Scarborough, Etobicoke, Mississauga, and Brampton.
Neighbourhoods Served
The homeowners who contact Toronto Basement Underpinning are usually wrestling with one of these. We solve them properly - not with a quick fix that fails in two years.
Your Toronto Victorian semi or rowhouse has a 5'10"-6'4" basement, typical of 1880s-1920s housing stock. Finishing feels claustrophobic and a legal apartment is impossible at that height.
Original stone-and-rubble or brick foundations under pre-1900 Toronto homes show active settlement after a century of frost cycles. Patches keep failing because the underlying bearing problem continues.
Pre-WWII clay tile perimeter drains under Toronto-core homes are long past their service life. Spring melt brings water at the wall-floor cove every year.
City of Toronto plan review can stretch 8-12 weeks, with Heritage Conservation District overlays adding another layer in Cabbagetown, Riverdale, the Junction, and the core. We handle every form and every hearing.
Complete framing, rough-ins, drywall, flooring and trim to convert a raw basement into a legal apartment or luxury living suite. Available in Toronto as part of our full-turnkey underpinning service.
Full basement floor excavation and underpinning to gain 1-3 feet of ceiling height. Fixed-price contract includes engineer drawings, city permits, and concrete restoration. Available in Toronto as part of our full-turnkey underpinning service.
Exterior stairwell and door opening cut into your foundation wall, engineered to code, permitted, and waterproofed. Creates a private entrance for a legal basement suite or direct backyard access. Available in Toronto as part of our full-turnkey underpinning service.
Crack injection, footing repair, and structural reinforcement for Toronto homes, with an honest call on when full underpinning is the right answer instead. Available in Toronto as part of our full-turnkey underpinning service.
End-to-end drawings plus permit coordination, architect, structural engineer, City of Toronto submission, and Committee of Adjustment if zoning relief is needed. Available in Toronto as part of our full-turnkey underpinning service.
Full interior waterproofing of foundation walls, weeping tile, sump pit, and dimpled membrane, to stop leaks at the source. Available in Toronto as part of our full-turnkey underpinning service.
Underground plumbing, main drain replacement, and rough-ins for new bathrooms, most efficient when combined with underpinning or basement finishing. Available in Toronto as part of our full-turnkey underpinning service.
Primary plus battery backup sump pump systems sized for Toronto's freeze-thaw water table, eligible for the City of Toronto Basement Flooding Subsidy. Available in Toronto as part of our full-turnkey underpinning service.
Every Toronto underpinning project routes through the City of Toronto building department, with Heritage Conservation District overlays adding 6-8 weeks to plan review for homes in the Annex, Cabbagetown, Riverdale, and the Junction. We pre-screen heritage status during the estimate and submit drawings under the Master Permit framework so the structural engineer's stamp lands at the same time as the architectural set.
Engineered assessment at your Toronto property. Fixed-price quote within two business hours.
Architect, structural engineer, Toronto building permit submission. We handle every form and every hearing.
Pin-section excavation and pours in Toronto. Daily site cleanup. Engineered inspections at every milestone.
City sign-off, engineer's stamp, warranty documentation, finishing handoff if bundled in Toronto.
Free engineered assessment. Workmanship warranty on every project.
Our crews dispatch from across the city. We know the GO-DVP-Gardiner traffic windows, the city's overnight construction-vehicle rules, and the parking-permit process for narrow downtown streets. Most Toronto sites get a same-day site visit and a fixed-price quote within two business hours of the inquiry. Permit submissions go through the City of Toronto Building Department at City Hall and through the appropriate district office.
Toronto homes range from 1880s rubble-and-fieldstone Victorian semis with 5'10" basements, through 1920s-1950s brick foundations, to post-war concrete-block detached homes in the inner suburbs. Each era takes a different staging plan, a different excavation depth, and a different waterproofing detail. Our project managers have personally underpinned every one of these foundation types.
Toronto property owners bundle multiple basement scopes on one fixed-price contract. All 8 services below price at published City of Toronto rates.
Basement underpinning (also called basement lowering or foundation underpinning) is full basement floor excavation with pin-by-pin concrete underpinning to gain 1-3 feet of ceiling height. Fixed-price contract includes architect drawings, structural engineer stamp, and building permit coordination.
From $20,000
Complete basement finishing after underpinning or waterproofing is done: framing, insulation, drywall, flooring, kitchen and bath rough-ins, trim, and paint. Full turnkey suite build ready for occupancy inspection.
From $35,000
Interior weeping tile replacement along the foundation perimeter, new sump pit and battery-backup sump pump, Delta-MS drainage membrane on interior walls, and hydrophobic polyurethane crack injection where required.
From $6,000
Hydrophobic polyurethane crack injection for active water leaks, epoxy structural crack repair, carbon fibre stitching for shifting walls, and full wall stabilisation systems for bowed or leaning foundation walls.
From $400
Complete architect site plan drawings, structural engineer stamped footing and beam details, and municipal building permit application coordination for basement underpinning, finishing, and second-suite conversion projects.
From $2,500
Sump pit excavation, primary submersible sump pump installation, battery-backup secondary pump for power outages, and city-approved backwater valve installation for basement flood prevention.
From $800
Basement rough-in plumbing for kitchen and bath in second-suite conversions, drain camera inspection for existing sanitary lines, backflow prevention valve installation, and municipal service connection coordination.
From $1,500
Basement walkout entrance construction: exterior excavation, engineered retaining walls, waterproof stair landing, insulated exterior door frame, drainage tie-in, and weather-sealed threshold for legal second-suite egress.
From $12,000
“1880s Cabbagetown rowhouse with a stone-and-rubble foundation no one else would touch. TBU underpinned in pin sections, kept the front-parlor walls pristine, and turned a 5'10" basement into a real 8-foot ceiling. City of Toronto permit through in six weeks.”
Sarah K.
Cabbagetown, Toronto
“Beaches semi on a classic narrow lot. The crew worked around the parking-permit quirks for the street and finished the underpinning plus interior waterproofing in five weeks. Basement stays bone-dry through every Lake Ontario humidity spike.”
Andrew M.
The Beaches, Toronto
“Trinity Bellwoods 1905 Victorian. We expected the foundation work to be brutal. The team's pin-section sequencing kept us in the upper floors the entire project. New 8-foot basement, full waterproofing, no surprise change orders.”
Vanessa H.
Trinity Bellwoods, Toronto
Free estimate within two business hours. Local crews, same-day estimate.
