Converting a garage into living space or a rental unit in Ontario

General guidance for Ontario. Requirements are interpreted by your municipality, so confirm the specifics for your property before you commit to a plan.

First decide: a room for the house, or a separate unit?

A garage can become a family room, an office or a bedroom that belongs to the main house. Or it can become a self-contained unit with its own kitchen, bathroom and entrance that you rent out or give to a family member. Both are possible, but they are different projects with different rules.

A room for the house mostly comes down to the floor, insulation, heat and closing in the garage door. A separate unit adds fire separation, its own heating, alarms, a second kitchen and bathroom, and the zoning questions about how many units your lot can have. Decide this before anyone draws anything, because it changes the drawings, the permit and the budget.

Do you need a permit to convert a garage in Ontario?

Yes. Turning a garage into living space is construction and a change in how the space is used, so it needs a building permit from your municipality before work starts, with inspections along the way. Closing in the garage door opening is structural work too, and it belongs on the drawings.

The electrical work needs its own notification with the Electrical Safety Authority (ESA). That is separate from the building permit. The Licensed Electrical Contractor normally files it and arranges inspections, and ESA requires the wiring to be inspected before it is covered up.

Ontario's 2024 Building Code took effect on January 1, 2025, and permit applications made since April 1, 2025 have to use it. If you have older drawings from a past plan, have them checked against the current code before you apply.

Can you rent out a converted garage? The three-unit rule

Since November 28, 2022, Ontario's Planning Act lets most serviced urban residential lots have up to three units. That can be two units in the house plus one in an ancillary building such as a detached garage, or three units in the house if no outbuilding contains a unit. Municipalities cannot require more than one parking space per unit for these, and no minimum unit size applies beyond the Building Code.

Ontario Regulation 462/24, in force since November 20, 2024, removed more zoning barriers on those lots. A municipality cannot require more than 4 metres between a building with one of these units and another building with a residential unit, it has to allow lot coverage of at least 45 per cent, and floor space index and angular plane limits no longer apply. Setbacks, height and the city's suite size limits still do.

These rules apply to urban lots on full municipal water and sewer. Rural and unserviced lots follow local rules. Either way, your city's zoning by-law still decides the details, so check your lot before you design.

Attached garages: the floor, the shared wall and the door

The garage slab is the first problem. It is usually lower than the house floor, sloped toward the door for drainage, and has no insulation under it. The new floor has to end up level, dry and warm, which normally means building up an insulated floor over the slab. Expect questions about moisture and soil gas once the space becomes a room people live in.

The wall and ceiling between a garage and a house are built to keep fire and exhaust fumes out of the home. If you convert only part of the garage and keep a bay for parking, that protection has to carry on between the remaining garage and the new room, including the door between them. If the new space becomes a separate unit, it also needs fire separation from the main house and smoke alarms that are connected so one sets them all off.

Heating is the other big decision. Extending the house furnace is sometimes possible for a room. For a separate unit it brings extra requirements, so a dedicated system such as a ductless heat pump is often the simpler answer.

Detached garages: becoming a garden or laneway suite

In Toronto, a self-contained unit in a rear-yard building is a garden suite, or a laneway suite if the lot backs onto a public lane, and each has its own zoning rules. The City says an existing garage can sometimes become a garden suite, depending on its size. If the garage was built with a building permit, its existing setbacks and distance from the house can stay. If it was built without one, it is treated as a new building.

Toronto also says water and sanitary lines should connect from the main house, and the suite cannot be severed onto its own lot. Emergency access from the street comes from the Building Code and is reviewed by Toronto Building and Toronto Fire Services. It cannot be varied by a minor variance, so check it before anything else on a lot with a long or narrow side path.

Outside Toronto, the provincial three-unit rule still allows one unit in an ancillary building on most serviced lots, but the local zoning by-law sets the setbacks, height and size. Many old garages are too small, too close to the lot line or sit on footings that will not carry a heated, insulated building. Sometimes rebuilding on the same spot is the better plan. We will tell you which before you pay for drawings.

Parking after the garage is gone

Converting a garage removes a parking space, and the city may check whether the property still meets its zoning for parking and driveways. Do not assume the car can simply move to the front yard. The provincial rule limits how much parking a city can require for an additional unit, and Toronto requires no car parking for a garden suite (it does require bicycle parking), but the rules for the main house still apply. Check this at the zoning stage.

Before you pay for drawings

Settle these first and the permit goes much smoother.

• Room for the house, or a separate unit? Write it down.
• Was the garage built with a permit? Look for it in the property file or ask the city.
• How many units are on the lot already, including any basement apartment?
• Is the lot on municipal water and sewer, and how far are those lines from the garage?
• Is there a clear route from the street for emergency access to a detached garage?
• Can the electrical panel and service handle a second kitchen and its own heating?
• Will the loss of the parking space cause a zoning problem?
• If it will be rented: tell your insurance broker, and check whether your city registers or licenses additional units.

For landlords and investors adding a unit

A garage suite is a rental unit like any other once it is finished: it needs to be legal, insured for what it is, and easy to maintain between tenants. Building it right the first time is what keeps a later sale, refinance or insurance claim from turning into a problem.

Canata Construction handles garage conversions, additions and second units across Toronto, the GTA, Hamilton, Halton, Niagara and the rest of Ontario. We coordinate the drawings and permit, give an itemized written scope, and carry full liability insurance and WSIB coverage.