Basement Lowering in Toronto & the GTA
Transform a cramped basement into full-height living space with professional underpinning.
Basement lowering — also called bench footing or full underpinning — is the process of excavating beneath your existing foundation to increase basement ceiling height, typically from 6 feet or less to a full 8 or 9 feet. This is one of the most transformative renovations available to GTA homeowners, converting unusable crawl spaces or low-ceiling basements into legal living areas, rental apartments, home offices, or recreation rooms. The procedure is especially relevant in Toronto's older neighbourhoods — Riverdale, The Beaches, High Park, Leslieville, and similar areas where pre-war homes were built with shallow foundations and ceiling heights below modern standards. The process requires structural engineering, municipal permits, and experienced underpinning contractors working in controlled sequences to maintain building stability throughout. Buildoreno has completed hundreds of basement lowering projects across the Greater Toronto Area, from Victorian semis in downtown Toronto to mid-century bungalows in the inner suburbs.
What you get, done right
What basement lowering costs across the GTA
Median project pricing in each of our busiest markets. Your exact number depends on scope, access, and site conditions — every Buildoreno quote is free, written, and itemized.
| City | Price range | Full guide |
|---|---|---|
| Toronto | $65,000–$90,000 | View → |
| Mississauga | $65,000–$92,000 | View → |
| Brampton | $60,000–$85,000 | View → |
| Vaughan | $53,000–$76,000 | View → |
| Oakville | $68,000–$96,000 | View → |
| Markham | $52,000–$74,000 | View → |
Median project pricing. See each city guide for the full small / medium / large breakdown.
Our process, step by step
- 1Engineering & Permits
A structural engineer designs the underpinning plan with excavation sequence, bench dimensions, and concrete specifications. We submit permit applications to your municipality and coordinate inspections throughout.
- 2Preparation & Shoring
The basement is cleared, temporary supports are installed where needed, and the excavation sequence is established. Underpinning proceeds in small sections (typically 3–4 foot widths) to maintain building stability at all times.
- 3Excavation & Forming
Each section is hand-excavated beneath the existing footing to the new depth, formed with plywood or steel forms, and prepared for concrete. The bench or full-depth extension is sized per the engineer's specifications.
- 4Concrete Pouring & Curing
High-strength concrete is poured into each section and cured before the adjacent section is excavated. This sequence ensures the building is always fully supported. Multiple pours occur over several weeks.
- 5Waterproofing & Finishing
Once all sections are complete, the new walls are waterproofed, drainage tile is installed at the new footing level, and the basement floor is poured at the new lower elevation. The space is ready for interior finishing.
What it costs
Every Buildoreno estimate is a free, itemized written quote — no hidden line items. Your exact price depends on site conditions, materials, and scope.
See the full underpinning cost guide →Last updated: March 2026
Basement Lowering questions, answered
A typical Toronto basement lowering takes 4–8 weeks for the structural work (excavation, forming, pouring). This doesn't include interior finishing. Factors affecting timeline include basement size, number of sections, soil conditions, and municipal inspection scheduling.
Yes, in most cases. The work is confined to the basement, though it is noisy and dusty during working hours. Main floor living is minimally affected. Some homeowners choose to stay elsewhere during the most intensive excavation phase for comfort.
Yes. Basement lowering requires a building permit in all GTA municipalities. You'll need structural engineering drawings, a permit application, and multiple inspections (excavation, forming, rebar, concrete, waterproofing). We handle the entire permit process.
When performed by experienced contractors following engineered plans, underpinning is safe and actually strengthens your foundation. Minor cosmetic cracking in drywall upstairs is possible but typically limited. We monitor the structure throughout and the engineer inspects at critical stages.
Bench footing extends the foundation depth using a stepped concrete bench inside the existing footing — it's less expensive but reduces usable floor area. Full underpinning extends the footing itself to the new depth — more expensive but maximizes floor space. We recommend the approach that best fits your goals and budget.
Ready to unlock
your basement?
Book a free basement assessment. We'll measure your existing ceiling height, explain whether you even need to underpin, and walk you through the engineered, permitted process.
Call (647) 254-0877