This basement renovation cost calculator estimates the cost of finishing a basement turnkey (low, typical and high, before tax), based on area, finish level, a powder room or full bathroom and technical options. Reference case, data reviewed in November 2026: finishing an 800 sq ft basement to a standard level costs about $60,000 before tax in Quebec ($48,000 to $76,000), $60,000 before tax in Ontario ($44,000 to $80,000), $72,000 before tax in British Columbia ($54,400 to $96,000), and $68,000 before tax in Alberta ($54,400 to $89,600), without a bathroom. Prices currently cover: Quebec, Ontario, British Columbia and Alberta. The detailed budget is emailed to you as a PDF.
To receive your detailed budget, use the “Email me this budget (PDF)” form on renoclair.ca.
Free and independent toolBefore tax. With taxes (typical):
Email me this budget (PDF)
The detailed budget (parameters, line-by-line breakdown, materials-only reference price, applicable rebates and standards) is emailed to you as a PDF at the address you enter. We keep your email and the calculation parameters for 12 months, then delete them. This information is processed by our hosting and email providers, who may store it outside Quebec. You can request access to, correction or deletion of your information. Person in charge of the protection of personal information: info@renoclair.ca. Privacy policy.
Typical costs by province (before tax)
| Item (turnkey, before tax) | Low | Typical | High |
|---|---|---|---|
| Quebec: Basic finish, open area (per sq ft) | $45 | $60 | $75 |
| Quebec: Standard finish, closed rooms (per sq ft) | $60 | $75 | $95 |
| Quebec: High-end finish (per sq ft) | $85 | $105 | $130 |
| Quebec: Powder room | $6,500 | $9,500 | $13,500 |
| Quebec: Full bathroom with under-slab plumbing | $11,000 | $16,500 | $24,000 |
| Quebec: Egress window with concrete cutting | $1,800 | $2,600 | $3,800 |
| Quebec: Panel or subpanel upgrade | $1,800 | $2,800 | $4,500 |
| Quebec: Radon mitigation or sump pump with battery | $1,500 | $2,300 | $3,500 |
| Ontario: Basic finish, open concept (per sq ft) | $40 | $55 | $75 |
| Ontario: Standard finish, partitioned rooms (per sq ft) | $55 | $75 | $100 |
| Ontario: High-end finish (per sq ft) | $75 | $100 | $135 |
| Ontario: Powder room | $5,500 | $8,500 | $13,000 |
| Ontario: Full 3-piece bathroom with under-slab rough-in | $12,000 | $17,500 | $25,000 |
| Ontario: Egress window with concrete cutting | $2,000 | $2,800 | $4,200 |
| Ontario: Panel or subpanel upgrade (ESA LEC) | $2,000 | $2,800 | $4,200 |
| Ontario: Radon mitigation or sump pump with battery | $1,600 | $2,500 | $3,800 |
| British Columbia: Basic finish, open area (per sq ft) | $50 | $68 | $90 |
| British Columbia: Standard finish, closed rooms (per sq ft) | $68 | $90 | $120 |
| British Columbia: High-end finish or secondary suite (per sq ft) | $95 | $130 | $175 |
| British Columbia: Powder room (toilet and vanity) | $6,500 | $9,500 | $14,500 |
| British Columbia: Full bathroom with under-slab plumbing | $13,000 | $19,000 | $27,000 |
| British Columbia: Egress bedroom window with concrete cutting | $2,200 | $3,100 | $4,600 |
| British Columbia: 200 A electrical panel / sub-panel | $2,200 | $3,000 | $4,500 |
| British Columbia: Active radon mitigation or sump pump with battery | $1,800 | $2,700 | $4,000 |
| Alberta: Basic finish, open area (per sq ft) | $48 | $64 | $85 |
| Alberta: Standard finish, closed rooms (per sq ft) | $68 | $85 | $112 |
| Alberta: High-end finish (per sq ft) | $95 | $125 | $165 |
| Alberta: Powder room | $6,200 | $9,000 | $13,800 |
| Alberta: Full bathroom | $12,500 | $18,000 | $25,500 |
| Alberta: Code-compliant egress window | $2,100 | $2,950 | $4,300 |
| Alberta: Electrical sub-panel or upgrade | $2,000 | $2,800 | $4,200 |
| Alberta: Active radon mitigation or sump pump with battery | $1,700 | $2,550 | $3,800 |
Before tax, November 2026. Rates cross-checked across verified renovation contractors and cost databases in Quebec and Ontario. Taxes are applied separately based on province (14.975% GST + QST in Quebec, 13% HST in Ontario, 5% GST in British Columbia — 7% PST on materials is paid by the contractor and embedded in installed prices, and 5% GST only in Alberta with no PST).
What is included and what is not
Included
- Framing, foundation wall insulation (OBC SB-12 R-20 / Quebec R-15+) and vapour barrier
- Subfloor and floor covering (LVP vinyl or laminate)
- Drywall, taping, paint, interior doors and trim
- Electrical wiring (ESA / CMEQ) and baseboard heating
- Coordination by a licensed general contractor
- Bathroom and technical options selected
Not included
- Foundation crack or exterior French drain repair ($15,000 to $25,000)
- Underpinning or lowering slab, pyrite or asbestos removal
- Municipal permit fees (often $150 to $350)
- Specific requirements for an independent accessory apartment (strict fire separations, separate entrance)
- Contingency reserve (plan 10% to 15%) and taxes
How the basement renovation cost calculator calculates your estimate
The amount multiplies the area (300 to 2,000 sq ft) by the turnkey rate of the finish level in your province, then adds the powder room or bathroom and options separately to avoid double counting. In Quebec, standard finish averages $60 to $95/sq ft (typical $75); in Ontario, standard finish averages $55 to $100/sq ft (typical $75); in British Columbia, standard finish averages $68 to $120/sq ft (typical $90). Totals are rounded to $50 below $10,000 and $100 above.
Amounts are before tax and rounded ($50 below $10,000, $100 above). The calculator also shows the typical amount with applicable sales tax (14.975% GST + QST in Quebec, 13% HST in Ontario, 5% GST in British Columbia, 5% GST only in Alberta). Items marked as RénoClair assumptions are listed as such in the PDF.
Rebates and financial aid
British Columbia – CleanBC Better Homes: up to $1,200 to $2,000 for foundation wall insulation when installed by a Home Performance Contractor Network (HPCN) registered contractor (betterhomesbc.ca, verified November 2026). The federal Multigenerational Home Renovation Tax Credit also provides up to $7,500 (15% of $50,000) when creating a secondary suite for an eligible relative.
Ontario – Home Renovation Savings Program (Save on Energy & Enbridge Gas): Energy assessment stream: $1,500 to insulate basement walls above R-22 ($900 from R-10 to R-22), $500 for the slab and $300 for the header, plus $600 toward the assessments. Assessments before and after the work and at least two upgrades are required (homerenovationsavings.ca, read on November 8, 2026). The federal Multigenerational Home Renovation Tax Credit provides up to $7,500 (15% of $50,000) when finishing a secondary suite for an eligible relative.
Quebec – Rénoclimat: $2.50 per sq ft of foundation wall insulated to at least R-15 (minimum 300 sq ft, up to $2,500 for a house), plus up to $1,000 for a battery backup sump pump and $700 for a backwater valve.
Permits, licences and rules
- Alberta (NBC(AE) 2023 & Alberta Safety Codes Act): Finishing a basement requires municipal building, plumbing and electrical Safety Codes permits (Calgary, Edmonton). Any bedroom requires a code-compliant egress window (at least 0.35 m² / 3.77 sq ft unobstructed opening). For secondary suites, Calgary’s SSIP closed Sept 28, 2026, while the Secondary Suite Amnesty waives permit/registration fees until Dec 31, 2026. Contractors taking deposits require a Prepaid Contracting Business Licence and direct home contracts include a 10-day cooling-off period.
- British Columbia (BCBC 2024 / VBBL & Technical Safety BC): Finishing a basement requires municipal building, plumbing and electrical permits across BC (Vancouver, Surrey, Burnaby, Richmond, Victoria). Every basement bedroom must have an unobstructed egress window meeting BC Building Code requirements (at least 0.35 m² / 3.77 sq ft open area with no dimension under 380 mm). Creating a legal secondary suite requires fire separations and separate heating/ventilation controls. Electrical and gas work requires permits under Technical Safety BC. Direct sales contracts signed at home include a mandatory 10-day cooling-off cancellation period without penalty under the BPCPA.
- Ontario (OBC & ESA): Finishing a basement requires a municipal building permit across Ontario (Toronto, Ottawa, Mississauga, Brampton, Hamilton, London). Any bedroom requires an OBC-compliant egress window with an openable area of at least 0.35 m² (3.8 sq ft) and no dimension under 380 mm (15 in). Electrical work must be completed by an ESA Licensed Electrical Contractor (LEC). Under Consumer Protection Ontario, contracts entered into at home include a mandatory 10-day cooling-off cancellation period.
- Quebec (RBQ): Finishing a basement usually requires a municipal building permit; check your city. Hire an RBQ-licensed general contractor, CMEQ electrician, and CMMTQ pipe mechanic for under-slab plumbing. Health Canada recommends a 3-month radon test (action level 200 Bq/m³); in homes built before 1990, test for asbestos before demolition.
Which provinces are covered?
Prices currently cover: Quebec, Ontario, British Columbia and Alberta (with province-specific rates, 14.975% GST + QST in Quebec, 13% HST in Ontario, 5% GST in British Columbia, 5% GST only in Alberta, and provincial building codes).
Limitations
This is a planning estimate, not a quote. It does not see the condition of your home, regional price differences or hidden problems; only a written quote after a visit gives the price of your work. The result cannot be printed from the page: the detailed budget is sent to you as a PDF by email, after you enter your address and give your consent.
Sources, review date and data version
- Data reviewed in November 2026; next review planned for February 2027.
- Price sources: published contractor prices in Quebec and Ontario, actual published quotes and retail prices collected in stores, cross-checked across several independent domains. Official sources: Canada Revenue Agency, Ontario Ministry of Finance, BC Ministry of Finance, Government of Quebec, Régie du bâtiment du Québec, Ontario Building Code, BC Building Code, Technical Safety BC, and municipal websites.
- Full method: Sources and methodology.
- French version: Calculateur prix sous-sol aménagé au Québec : estimez votre budget.
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Frequently asked questions
How much does it cost to finish an 800 sq ft basement?
For a standard turnkey finish (family room, bedroom/office, subfloor and paint), about $48,000 to $76,000 before tax in Quebec (typical $60,000) and $44,000 to $80,000 in Ontario (typical $60,000), without a bathroom.
How much does a basement bathroom add?
A full 3-piece bathroom with under-slab plumbing rough-in adds about $11,000 to $24,000 in Quebec (typical $16,500) and $12,000 to $25,000 in Ontario (typical $17,500).
Do I need a building permit to finish my basement?
Yes. In both Ontario and Quebec, finishing a basement, adding bedrooms, or altering plumbing/electrical requires a municipal building permit.
What is an egress window?
An egress window is a safety escape window required by building codes for any basement bedroom. It must provide an unobstructed opening of at least 0.35 m² (3.8 sq ft) with no dimension less than 380 mm (15 in).
How do I get the budget as a PDF?
Calculate your budget, then enter your email and check the consent box in the form under the result: the detailed PDF is sent by email. The result cannot be printed directly from the page.
When are prices updated?
Prices were reviewed in November 2026. The next review is planned for February 2027; the data version is shown on the page and in the PDF.
Which provinces does the calculator cover?
Currently Quebec and Ontario. The calculator includes province-specific pricing, local sales tax (14.975% GST+QST in Quebec, 13% HST in Ontario) and local regulations.