How much does basement renovation cost in Toronto?

With Zigma Group, basement renovation starts from $32 per sq ft, and most projects fall between $36,000 and $85,000. Prices are in Canadian dollars before HST, as of October 2026, and are confirmed after a site visit. The main factors are finished floor area; adding a bathroom, bar or laundry; and waterproofing or ceiling-height work needed first.

Do I need a permit to finish my basement in Ontario?

Often, yes. A permit is usually required if you add or move plumbing, change heating, alter structure or add an entrance. Simple cosmetic work may not need one. We check with your municipality.

Can you add a bathroom in a basement?

Yes. It depends on where the main drain is and whether the new fixtures can drain by gravity or need a pump. We check this at the first visit.

Do you do basement renovation projects in Toronto?

Yes. We work throughout Toronto, including Leaside, The Annex, High Park, Riverdale, The Beaches, Forest Hill and Lawrence Park. Call +1 (647) 718-3913 to arrange a visit.

Who issues the permit for this work in Toronto?

Where a permit is needed, it is issued by the City of Toronto (Toronto Building). We prepare the drawings and handle the application and inspections.

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Basement Renovation

Basements · Toronto

Basement Renovation in Toronto

A finished basement adds a full floor of living space without changing the outside of the house. Done properly, it starts with keeping the space dry and warm. In Toronto, much of the housing is pre-war: narrow semis and detached brick houses with plaster walls, old wiring and shared party walls.

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Finished room with wood flooring, recessed ceiling lighting and solid wood doors — From our Abtin project

Scope

What is included.

Moisture and foundation assessment
Insulation, framing and subfloor
Bathrooms, bars and laundry rooms
Electrical, lighting and heating
Egress windows and new entrances
Flooring, ceilings, doors and trim

Cost

What it costs.

From $32per sq ft

Most projects in Toronto: $36,000 to $85,000

What moves the price

Finished floor area
Adding a bathroom, bar or laundry
Waterproofing or ceiling-height work needed first

Prices are in Canadian dollars before HST, as of October 2026. Every project is confirmed with a written quote after a site visit.

Local knowledge

Basement Renovation in Toronto.

Homes like these
Older basements tend to be low and damp, on stone or early concrete foundations, so waterproofing and often underpinning come first.
Housing
In Toronto, much of the housing is pre-war: narrow semis and detached brick houses with plaster walls, old wiring and shared party walls.
Permits
Building permits in Toronto are issued by the City of Toronto (Toronto Building). We prepare the drawings, submit the application and book the inspections.
Areas we cover
We work throughout Toronto, including Leaside, The Annex, High Park, Riverdale, The Beaches, Forest Hill and Lawrence Park.
Suites and multiplexes
Toronto permits laneway suites, garden suites and, on most residential lots, up to four units in a house. That makes basement apartments and rear additions more feasible here than in many suburbs.
Tight lots
Narrow lots and shared walls mean additions and underpinning often need a minor variance or a neighbour's cooperation, so the approvals take planning.

Before you start

What to know.

Permits
In most GTA municipalities, finishing a basement needs a building permit when the work involves structural changes, new plumbing, heating changes or a new entrance. We confirm what applies to your address.
Water first
Any leak, damp wall or drainage problem has to be fixed before framing goes up. Finishing over moisture leads to mould behind the walls.
Ceiling height
Low ceilings, ducts and beams limit what a basement can become. If more height is needed, underpinning can lower the floor.

How we work

One team for every stage.

AssessWe survey the house as it stands.
Design and permitsDrawings and approvals before work starts.
Strip-outWhat is worn out comes off.
RebuildStructure, wiring, plumbing and walls.
FinishesCabinetry, tile, floors and paint.
HandoverWalkthrough and documents.

Questions

Basement Renovation in Toronto: the short answers.

How much does basement renovation cost in Toronto?: With Zigma Group, basement renovation starts from $32 per sq ft, and most projects fall between $36,000 and $85,000. Prices are in Canadian dollars before HST, as of October 2026, and are confirmed after a site visit. The main factors are finished floor area; adding a bathroom, bar or laundry; and waterproofing or ceiling-height work needed first.
Do I need a permit to finish my basement in Ontario?: Often, yes. A permit is usually required if you add or move plumbing, change heating, alter structure or add an entrance. Simple cosmetic work may not need one. We check with your municipality.
Can you add a bathroom in a basement?: Yes. It depends on where the main drain is and whether the new fixtures can drain by gravity or need a pump. We check this at the first visit.
Do you do basement renovation projects in Toronto?: Yes. We work throughout Toronto, including Leaside, The Annex, High Park, Riverdale, The Beaches, Forest Hill and Lawrence Park. Call +1 (647) 718-3913 to arrange a visit.
Who issues the permit for this work in Toronto?: Where a permit is needed, it is issued by the City of Toronto (Toronto Building). We prepare the drawings and handle the application and inspections.