How much does legal basement apartment cost in Vaughan?

With Zigma Group, legal basement apartment starts from $72,000, and most projects fall between $72,000 and $125,000. Prices are in Canadian dollars before HST, as of October 2026, and are confirmed after a site visit. The main factors are whether a new separate entrance has to be built; fire separation and egress window work; and kitchen and bathroom finish level.

What makes a basement apartment legal in Ontario?

It is permitted by local zoning, built under a building permit, meets Ontario Building Code requirements for fire separation, exits, ceiling height and ventilation, passes inspection, and is registered where the municipality requires it.

Can my existing basement apartment be legalised?

Often, yes. We compare it with the current requirements, prepare drawings, apply for the permit and carry out the corrections, which commonly involve fire separation, egress and electrical work.

Do you do legal basement apartment projects in Vaughan?

Yes. We work throughout Vaughan, including Concord, Woodbridge, Maple, Thornhill and Kleinburg. Call +1 (647) 718-3913 to arrange a visit.

Who issues the permit for this work in Vaughan?

Where a permit is needed, it is issued by the City of Vaughan's building department. We prepare the drawings and handle the application and inspections.

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Legal Basement Apartment

Basements · Vaughan

Legal Basement Apartment in Vaughan

A legal second suite turns a basement into a self-contained rental or family apartment. The difference between legal and not is the permit, the fire safety and the inspections. In Vaughan, most homes date from the 1980s onward: large detached houses in planned subdivisions, with estate properties around Kleinburg.

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Compact new bathroom with a floating vanity and slate-grey floor tile — From our Cobblestone Drive renovation

Scope

What is included.

Feasibility check against zoning and the Building Code
Permit drawings and application
Fire separation and interconnected smoke alarms
Separate entrance and egress windows
Kitchen, bathroom and laundry
Electrical, heating and ventilation for a second unit

Cost

What it costs.

From $72,000

Most projects in Vaughan: $72,000 to $125,000

What moves the price

Whether a new separate entrance has to be built
Fire separation and egress window work
Kitchen and bathroom finish level

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

Legal Basement Apartment in Vaughan.

Homes like these
Subdivision basements are typically full height with poured concrete walls and a bathroom rough-in, which makes finishing straightforward.
Housing
In Vaughan, most homes date from the 1980s onward: large detached houses in planned subdivisions, with estate properties around Kleinburg.
Permits
Building permits in Vaughan are issued by the City of Vaughan's building department. We prepare the drawings, submit the application and book the inspections.
Areas we cover
We work throughout Vaughan, including Concord, Woodbridge, Maple, Thornhill and Kleinburg.
Our home base
Zigma Group's office is at 237 Romina Drive in Concord, so Vaughan projects are the closest to us.
Heritage areas
Kleinburg-Nashville and old Thornhill are heritage conservation districts, where exterior changes need heritage approval.

Before you start

What to know.

The rules
Ontario now allows additional residential units on most urban residential lots, but each municipality sets its own registration and zoning details. A second suite must meet the Ontario Building Code and be built under a permit.
What inspectors look for
Fire separation between units, a safe exit, ceiling height, window size, smoke and carbon monoxide alarms, and properly inspected electrical work.
Existing unpermitted suites
An older basement apartment built without a permit can often be legalised. We assess what has to be opened up and corrected.

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

Legal Basement Apartment in Vaughan: the short answers.

How much does legal basement apartment cost in Vaughan?: With Zigma Group, legal basement apartment starts from $72,000, and most projects fall between $72,000 and $125,000. Prices are in Canadian dollars before HST, as of October 2026, and are confirmed after a site visit. The main factors are whether a new separate entrance has to be built; fire separation and egress window work; and kitchen and bathroom finish level.
What makes a basement apartment legal in Ontario?: It is permitted by local zoning, built under a building permit, meets Ontario Building Code requirements for fire separation, exits, ceiling height and ventilation, passes inspection, and is registered where the municipality requires it.
Can my existing basement apartment be legalised?: Often, yes. We compare it with the current requirements, prepare drawings, apply for the permit and carry out the corrections, which commonly involve fire separation, egress and electrical work.
Do you do legal basement apartment projects in Vaughan?: Yes. We work throughout Vaughan, including Concord, Woodbridge, Maple, Thornhill and Kleinburg. Call +1 (647) 718-3913 to arrange a visit.
Who issues the permit for this work in Vaughan?: Where a permit is needed, it is issued by the City of Vaughan's building department. We prepare the drawings and handle the application and inspections.