Cellar Renovation Cost in Canada in 2026

Key Insights on Cellar Renovation Costs

• Cellar renovation costs in Canada average $60 to $110 per square foot, depending on location and age of the property.

• Underpinning to raise a low ceiling is priced separately from all finishing work and typically adds $20,000 to $100,000 or more to the total before drywall or flooring enters the picture.

• A legal basement suite triggers specific building code requirements that can add $15,000 to $30,000 over a standard finishing budget.

• Building permits run $3,500 to $5,000 for most projects and are mandatory: work completed without a permit affects home insurance coverage and can complicate a resale.

In this guide, we’ll talk about:

1. How Much Does a Cellar Renovation Cost in Canada?
2. What Costs Does a Cellar Renovation Include?
3. How Much Does Cellar Underpinning Cost?
4. What Affects the Cost of a Cellar Renovation?
5. How Can You Save on Cellar Renovation Costs?
6. How Do I Find a General Contractor on HomeStars?
7. Frequently Asked Questions

How Much Does a Cellar Renovation Cost in Canada?

Cellar renovation costs vary considerably depending on the size of the space and the scope of work:

• Basic finishing, which covers framing, drywall, insulation, flooring, and electrical, typically runs $60 to $75 per square foot.

• Mid-range renovations with a bathroom, dedicated rooms, and better finishes land closer to $75 to $95 per square foot.

• High-end builds, including custom millwork, heated floors, or a full rental suite, can reach $95 to $110 per square foot or beyond.

Cellar Size (sq. ft.)	Estimated Total Cost: Basic to Mid-Range Finishes
500 sq. ft.	$35,000 to $55,000
700 to 800 sq. ft.	$45,000 to $70,000
1,000 sq. ft.	$65,000 to $95,000
1,200 to 1,500 sq. ft.	$85,000 to $130,000

These figures cover finishing an existing unfinished cellar. If structural work like underpinning is involved, costs increase substantially.

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What Costs Does a Cellar Renovation Include?

There are several components to a cellar renovation budget, and understanding each one separately makes it easier to see where costs can flex and where they cannot.

Labour cost of contractors

Labour typically accounts for 40 to 60 percent of the total cellar renovation budget. General contractors charge $40 to $90 per hour depending on the province and the complexity of the work, with trades such as electricians and plumbers billing approximately $80 to $150 per hour depending on the province. For projects that involve multiple trades, a general contractor coordinates scheduling and takes a management fee of roughly 10 to 20 percent of the total project cost.

Framing

Framing defines the room layout and partition walls. Expect to pay $15 to $30 per linear foot of wall, including materials and labour. Adding more rooms or angled walls drives up framing time significantly, as does removing and rebuilding walls in a partially finished space.

Insulation and waterproofing

Cellars are moisture-prone, so these are not optional. Spray foam and rigid insulation run $1.50 to $5.50 per square foot, while interior waterproofing costs $3 to $10 per square foot, while a full interior drainage system (weeping tile, perimeter channels) runs $70 to $230 per linear foot depending on the scope and your province.

Exterior waterproofing, which involves excavating around the foundation perimeter, can reach $10,000 to $15,000 and should be considered when there is active water intrusion rather than minor condensation.

Drywall

Drywall contractor costs include both labour and materials. They generally charge around $2 to $6 per square foot. Moisture-resistant drywall is worth the small premium in a cellar, particularly around bathrooms and on exterior below-grade walls where temperature differentials cause condensation.

Flooring

Flooring choices vary widely in cost:

• Luxury vinyl plank: $1 to $8 per square foot
• Ceramic tile: $5 to $20 per square foot
• Engineered hardwood: $6 to $12 per square foot
• Carpet: $7 to $12 per square foot

LVP is a common choice for cellars because it handles moisture better than solid hardwood and installs over a concrete subfloor without extensive prep.

Electrical and plumbing

• Electrical work for a finished cellar runs $2,500 to $10,000 depending on the number of circuits, pot lights, and outlets required.
• Plumbing rough-ins cost $1,500 to $5,000 for basic hookups, while a complete three-piece bathroom with fixtures, tile, and a shower enclosure typically totals $15,000 to $25,000.

For a more detailed breakdown, see our guides to plumbing costs and electrician costs.

Permits

A building permit is required before starting most cellar renovation work. Permit fees run $3,500 to $5,000 across Canadian municipalities for a standard finishing project, with separate permits for plumbing and electrical in many jurisdictions. Projects that include structural changes require stamped engineering drawings before a permit will be issued.

How Much Does Cellar Underpinning Cost?

If your cellar ceiling is too low to make the space livable, underpinning or bench footing raises the ceiling height by lowering the floor. This is the most expensive part of any cellar conversion, and it needs to be factored in before finishing quotes are collected.

Underpinning

Underpinning involves excavating soil around and beneath the existing foundation walls, then pouring new, deeper concrete footings in staged sections to keep the structure supported throughout. It requires a structural engineer, a building permit, and multiple city inspections.

Underpinning costs run $350 to $480 per linear foot of foundation, or roughly $80 to $100 per square foot for the overall project area. A full underpinning project on a typical cellar often lands between $50,000 and $100,000 before any finishing work begins, with projects in major urban centres tending toward the higher end.

Bench footing

For homes where full underpinning is not feasible due to neighbouring foundations or sandy soil conditions, bench footing is a practical option. This is when a concrete ledge is built along the perimeter walls to lower the interior floor without going under the foundation.

It costs $75 to $150 per linear foot and reduces usable floor area slightly along the walls.

Good to know: Adding a basement walkout as part of either process is common as the foundation is already exposed. It can add $10,000 to $30,000 to the budget, plus permits and engineering sign-off. Cutting an egress window runs $4,000 to $8,000 and is often required for a bedroom or rental suite to meet building code.

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What Affects the Cost of a Cellar Renovation?

Several variables move cellar renovation costs up or down significantly:

• Size of the space: more square footage means more labour and materials across every trade, so size is the primary cost driver.

• Scope: a basic finishing project costs far less than building a legal secondary suite, which requires specific ceiling height minimums, egress windows, fire separation between floors, and a separate electrical panel.

• Existing foundation condition: older homes may have foundation cracks, inadequate drainage, or ceiling height below code that need to be addressed before finishing can begin.

• Location: labour rates in Toronto and Vancouver run higher than in smaller cities. Toronto cellar renovation costs typically sit at or above the national average per square foot.

• Material choices: the gap between standard LVP and premium engineered hardwood, or between a basic drop ceiling and a coffered drywall ceiling, adds up across a full cellar.

• Number of trades involved: a bathroom, kitchenette, or secondary suite requires plumbers, electricians, HVAC contractors, and a general contractor to coordinate the work, each adding their own labour costs and scheduling requirements.

How Can You Save on Cellar Renovation Costs?

A few decisions made early in the project can reduce the final cost without cutting corners on quality:

• Stick to a single bathroom: each additional bathroom rough-in adds $1,500 to $5,000 in plumbing alone. One well-placed three-piece bathroom covers most use cases.

• Choose a drop ceiling over drywall: a suspended ceiling costs $2 to $6 per square foot versus $5 per square foot for drywall, and it gives easier access to pipes and wiring for future repairs.

• Keep the layout open: every partition wall adds framing, drywall, electrical, and sometimes plumbing. An open-concept design with one or two defined rooms keeps trade hours lower.

• Avoid moving load-bearing walls or plumbing stacks: relocating existing drains or main plumbing stacks is expensive and often requires engineering sign-off. Designing around existing services saves both money and time.

• Get at least three quotes: labour rates vary considerably between contractors in the same city. Getting multiple quotes gives you a realistic market rate and shows which contractors communicate clearly before the project starts.

Find a Cellar Renovation Pro on HomeStars

Cellar renovations involve multiple trades working in a specific sequence. A general contractor coordinates that process, manages permit applications and inspections, and keeps the project on schedule. For accurate costs specific to your home, the most reliable step is to connect with general contractors near you and compare their quotes directly. If you prefer, you can check out our guide to general contractor costs before reaching out.

Post your project on HomeStars, review profiles from local pros who have worked on similar cellar projects, read homeowner reviews, and reach out to the ones that look like the right fit for your job.

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Common Questions About Cellar Renovations Answered

How long does a cellar renovation take?

A basic finishing project on a 700 to 1,000-square-foot cellar typically takes three to six weeks, assuming no structural work is involved. Projects that include a bathroom, secondary suite, or significant electrical work take longer because each trade must be inspected before the next stage begins. Underpinning adds four to eight weeks to the timeline on top of the two to four weeks needed to obtain engineering drawings and a building permit before excavation starts.

Do I need a permit for a cellar renovation?

Yes, in almost all cases. Any work that adds living space, modifies electrical or plumbing systems, or involves structural changes requires a permit from your municipality. Finishing a cellar without a permit can complicate home sales and may affect your insurance coverage if something goes wrong. Your general contractor can apply for permits on your behalf.

When hiring through HomeStars, you can review a pro's project history to confirm they have experience navigating the permit process in your municipality.

What is the minimum ceiling height for a legal basement bedroom in Canada?

Minimum ceiling height requirements for habitable rooms vary by province, but most provincial building codes set the threshold at or around 1.95 metres, roughly 6.4 feet. Many buyers and inspectors prefer at least 7 feet for comfort and resale value. This is often the reason homeowners pursue underpinning before finishing: many older homes fall short of the current code minimum.

Will a finished cellar increase my home's resale value?

A properly permitted and finished cellar typically returns 50 to 75 percent of its renovation cost at resale, based on industry estimates for the Canadian market. A legal secondary suite that generates rental income tends to yield a stronger return than a recreational room, particularly in high-demand markets like Toronto and Vancouver. The critical factor is the permit: an unpermitted basement suite raises red flags in home inspections and can reduce the sale price.

What does cellar waterproofing cost?

Cellar waterproofing costs depend on whether the work is done from the interior or exterior. Interior waterproofing, which typically involves drainage membranes, a sump pump, and sealing, runs $3 to $10 per square foot. Exterior waterproofing requires excavating around the foundation perimeter and costs considerably more, often reaching $10,000 to $15,000 for a full treatment. For a full breakdown of what affects the price, see our guide to basement waterproofing costs.