Basement Finishing Cost in 2026: Toronto and GTA Prices Per Square Foot (CAD)

Finishing a Toronto or GTA basement costs $35 to $80 per square foot in 2026, before HST, for anything from one open room to a finish with a bathroom, according to Senso Design. A legal basement apartment runs $90 to $150. Basement finishing turns bare concrete walls and floor into heated, permitted living space. For local quotes, start with our basement renovation services.

All GTA, Toronto, Mississauga and Hamilton figures are in CAD. HomeGuide figures are in USD. All figures were checked on October 20, 2026.

How much does basement finishing cost per square foot in the GTA?

A GTA basement finish costs $35 to $55 per square foot for a basic open room and $55 to $80 with separate rooms and a bathroom, before HST, says Senso Design. A legal apartment runs $90 to $150. Asteri Construction starts open-concept work at $34 per square foot and says most basements land between $35 and $70.

Toronto and GTA basement finishing cost by scope (CAD, 2026, before HST)

Scope	Cost per sq ft	500 sq ft basement	What it covers
Basic finish	$35 to $55	$20,000 to $30,000	Framing, insulation, drywall, flooring, lighting and paint; plumbing stays put
Mid-range with a bathroom	$55 to $80	$35,000 to $50,000	Separate rooms, a three-piece bathroom, better flooring and trim
Legal apartment or high end	$90 to $150	$55,000 to $80,000	Egress, fire separation, kitchen, laundry, HVAC changes and inspections

Source: Senso Design, Basement Renovation Toronto (2026).

The low end assumes a dry slab. Asteri says its $34 scope excludes moisture repair, subfloor systems, bathrooms and suite work, and prices each as its own line (Asteri Construction). Senso Design says water and plumbing move a basement quote the most. If you have had water in the basement, read our basement waterproofing statistics before you budget the finish.

What does it cost to finish a basement by size?

A 1,000 square foot Toronto basement with a bedroom and a three-piece bathroom costs about $67,800 before HST, according to Desire Basements' quote sheet. The same space without a bathroom is $54,900. The price per square foot falls as the basement grows, because the permit, stairs, panel work and bathroom cost the same at any size.

Toronto basement finishing cost by floor area (CAD, 2026, before HST, permits and drawings included)

Floor area	With bathroom	Without bathroom	Per sq ft with bathroom
600 sq ft	$56,000	$43,300	about $93
800 sq ft	$62,000	$49,100	about $77
1,000 sq ft	$67,800	$54,900	about $68
1,200 sq ft	$75,200	$62,300	about $63
1,500 sq ft	$83,700	$70,900	about $56
2,000 sq ft	$97,700	$84,800	about $49

Source: Desire Basements, Basement Renovation Cost Toronto 2026. Standard build: one bedroom (two from 1,200 sq ft), a three-piece bathroom, 13 oak stairs and three interior doors.

US prices run lower. HomeGuide puts a 1,000 square foot US basement at $30,000 to $40,000 as one open plan and $40,000 to $50,000 split into three rooms, in USD (HomeGuide). It says labour is 20% to 40% of the total, and that basement ceilings must be at least 7 feet tall.

What do bathrooms, walkouts and underpinning add?

A basement bathroom adds $15,000 to $25,000 on Senso Design's Toronto figures, and a walkout entrance adds $15,000 to $25,000, says Desire Basements. Low ceilings are the largest swing: full-perimeter underpinning costs $60,000 to $120,000, while a bench footing costs $300 to $500 per linear foot.

Common basement add-ons in Toronto and the GTA (CAD, 2026, before HST)

Add-on	Typical cost	Source
Basement bathroom	$15,000 to $25,000	Senso Design
Three-piece bathroom (quote sheet line)	$11,700	Desire Basements
Bathroom, wet bar or kitchenette	$10,000 to $25,000+	Asteri Construction
Soundproofed ceiling	from $4,000	Desire Basements
Walkout basement entrance	$15,000 to $25,000	Desire Basements
Bench footing	$300 to $500 per linear ft	Desire Basements
Full-perimeter underpinning	$60,000 to $120,000	Desire Basements
Legal basement suite (purpose-built)	$75,000 to $110,000+	Desire Basements

Ceiling height decides whether underpinning is on the quote. Desire Basements says the 2024 Ontario Building Code allows a secondary suite in an existing house with a ceiling as low as 1.95 metres, or 1.85 metres under beams and ducts. A suite also needs a separate entrance, fire separation and an egress window, which is why it costs more than a family room.

• Egress window (US benchmark): $2,000 to $5,000 installed, and HomeGuide says basement bedrooms and living spaces must have one (HomeGuide, USD).
• Waterproofing (US benchmark): $6,000 to $18,000 to seal walls and add a pump and drain (HomeGuide, USD).
• Bathroom rough-in: Asteri says a builder-stubbed rough-in keeps a bathroom near the low end, while no rough-in means breaking and patching the slab.

What do basement permits cost in Toronto, Mississauga and Hamilton?

Toronto charges $6.20 per square metre to finish a basement in a house in 2026, with a $214.79 minimum, so a 1,000 square foot basement pays about $577. Mississauga charges $5.64 per square metre with a $244 minimum. Hamilton charges $4.06 per square metre with a $291 minimum fee.

2026 building permit fees for finishing a basement in a house (CAD)

City	Basement finishing rate	Minimum fee	About 1,000 sq ft (93 m2)	Adding a unit
Toronto	$6.20 per m2	$214.79	about $577	plus $56.33 per new unit
Mississauga	$5.64 per m2	$244	about $524	$11.33 per m2 plus the minimum
Hamilton	$4.06 per m2	$291	about $377	$515 flat fee

Sources: City of Toronto fee schedule effective January 1, 2026; City of Mississauga Schedule B, 2026; City of Hamilton Building By-law 15-058. The 1,000 sq ft column is our math (rate times 93 m2).

Skipping the permit costs more. Toronto adds 50% of the permit fee, or $214.79 if greater, when construction starts before a permit is issued (City of Toronto). Mississauga charges $244 each for a basement walkout permit (City of Mississauga). Underpinning in Toronto adds $12.37 per linear metre to the permit.

How long does a basement finish take, and how do you hire for one?

A basic Toronto basement finish takes 4 to 6 weeks on site, a finish with a bathroom 6 to 8 weeks and a legal apartment 10 to 14 weeks, says Senso Design. Permit review adds 6 to 12 weeks before work starts. Hire a contractor who pulls the permit, carries WSIB and liability cover and puts the price in writing.

• Contract: Ontario says any home renovation contract worth more than $50 must be in writing, and recommends a down payment of no more than 10% (Government of Ontario).
• Estimates: If an estimate is in the contract, the final price cannot be more than 10% over it unless you agree to new work or a new price.
• Scope: Ask every bidder whether moisture work, a subfloor, permits and inspections sit inside the number. Asteri says a quote that hides those lines is not a lower price.

A general contractor's fee is part of most basement quotes; see our general contractor cost guide for GTA rates. For the wider data, including finished-basement resale value, read our basement renovation statistics. Weighing more space up or out instead? Compare our home addition cost guide, or get basement renovation quotes in Vaughan.

Sources

• Senso Design, Basement Renovation Toronto (2026 price bands)
• Desire Basements, Basement Renovation Cost Toronto 2026
• Asteri Construction, Basement Finishing Cost Per Square Foot in the GTA (2026)
• City of Toronto, Building Permit Fees
• City of Mississauga, Schedule B: 2026 Classes of Permits and Fees
• City of Hamilton, Building Permit Fees
• HomeGuide, Cost to Finish a Basement (2026)
• Government of Ontario, Your rights when starting home renovations or repairs

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