How Do I Know if a Basement Apartment Is Legal in Toronto?

By Capable Group · November 10, 2026 · City of Toronto fees, tools and Ontario rules checked on the official pages November 9–10, 2026.

The listing says “basement apartment, great income”. Or you already own the house, a tenant lives downstairs, and you were never quite sure. It has a kitchen, a bathroom and its own door. It looks like an apartment. That does not make it a legal one.

A basement apartment in Toronto is legal when three things are true: the zoning allows a secondary suite in that house, the suite was built under a building permit that passed its inspections (or, for a suite that already existed on July 14, 1994, it meets the Fire Code rules for two-unit houses), and the electrical work was inspected. A seller’s word, a separate entrance or years of rent do not prove any of the three. Paper does.

Why it matters now: an insurance claim, a sale, a refinancing or one complaint can bring the question up on the worst possible day. Checking takes a few days and costs little. Here is where to look, in order.

The three tests, at a glance

Test 1: does zoning allow a suite in this house?

Toronto’s city-wide Zoning By-law 569-2013 generally allows one secondary suite inside a detached house, a semi-detached house or a townhouse in the Residential zones, subject to the standards in its Section 150.10. So for most Toronto houses the answer to the zoning question is yes.

That is only the first door. “Allowed by zoning” means you may build one with a permit. It does not mean the one already in the basement was built properly.

Test 2: was it built with a permit?

This is where most “is it legal?” questions are won or lost. There are three places to look, from fastest to most complete.

Step 1: the City’s permit status search

Toronto’s online permit search shows the stage each permit has reached. Know its limit before you trust an empty result: the City says it lists active permits that are 10 years old or less, and closed or cancelled permits for only about one month after closing. A suite permitted and finished years ago will not appear.

Step 2: a Property Information Report

For a specific address, this City report covers issued building permits on file, the status of inspections and any outstanding orders. In 2026 it costs $214.79 per request and takes about five business days. It is often asked for before a sale or refinancing. One thing it will not do: the City states the report does not outline permitted use, so read it for permits and open orders, not for a “legal” stamp.

Step 3: the building records

The owner, or anyone with the owner’s written consent, can ask Toronto Building for the drawings from earlier permit applications. The 2026 fee is $76.98 per disclosure and the City aims to process requests within 30 business days. If you are buying, ask the seller to request them or to sign the consent. Approved drawings that show a second unit, with a closed permit, are the strongest proof there is.

Reading the result. A permit that was opened and never closed is not a pass: the final inspection may never have happened. A permit for “basement finishing” is not a permit for a second unit. And no permit at all, in a house built or converted after 1994, usually means the suite was never approved.

What about a suite that has been there for decades?

Ontario’s Fire Code has a section for two-unit houses that already existed on or before July 14, 1994. Toronto Fire Services describes these as a detached, semi-detached or row house with a secondary suite, two units in total, and points owners to Part 9, Section 9.8 of the Fire Code for the requirements. An old suite can be lawful under those retrofit rules, but it still has to meet them, and the owner has to be able to show it.

Test 3: walk through it with your eyes open

You do not need to be an inspector to spot the common failures. Toronto Fire Services lists these as risks in basement apartments:

• No dedicated exterior door leading directly to ground level.
• No interconnected smoke and carbon monoxide alarms through the house.
• Electrical upgrades that were not inspected and approved by the Electrical Safety Authority.

Then check the numbers Ontario publishes for second units in existing houses:

• Ceiling: a basement unit is permitted a height of 1.95 m (6 ft 4¾ in) over the required floor area.
• Fire separation: 30 minutes between the units and between units and common areas; it can be reduced to 15 minutes if the whole house has interconnected smoke alarms.
• Smoke alarms: on every level, outside sleeping areas and in each bedroom of the second unit.
• CO alarms: near bedrooms when the house has a fuel-burning furnace or an attached garage.
• Escape window, where one is needed: an unobstructed opening of at least 0.38 sq m (4.1 sq ft), openable without tools.

A low ceiling, a bedroom with a tiny window or one shared stair with no fire-rated walls are signs to slow down. The full list is in our guide to legal basement suite requirements in Ontario.

Buying a house with a basement apartment

“Basement apartment”, “in-law suite”, “income potential” and “retrofit status not warranted” are four different promises. Only documents close the gap:

1. Ask for the building permit number and the closed-permit record for the second unit.
2. Ask for the Electrical Safety Authority certificate for the suite’s wiring.
3. Order the Property Information Report before you firm up, and read it for open permits and orders.
4. If nothing exists, price the house as a single home with a finished basement, and get a quote to legalize before you count the rent.

Illustration, not a client project: two buyers look at the same semi. The first takes the listing’s word and learns after closing that the permit was for finishing only. The second spends $214.79 and five business days on a report, sees no second-unit permit, and negotiates the legalization cost off the price.

If yours turns out not to be legal

It can usually be fixed, and fixing it on your own schedule costs less than fixing it under an order. The path is a building permit for a secondary suite: drawings, an application through Toronto Building, the work, then inspections. What it takes depends on height, exits and what is behind the walls. The risks of leaving it are in our guide to fines for renting an illegal basement suite, and the permit path is in basement permits in Toronto.

How this goes with us

Send the address and a few photos: the stairs, the ceiling at its lowest point, the bedroom window, the electrical panel. On a free visit we check height, exits, separation and services, and tell you plainly whether the suite can be made legal and what stands in the way. Then you get free permit drawings and one fixed, itemized quote for the work, the permit and the inspections.

We do this across the city, from home renovation in Scarborough to home renovation in North York. Rules change from city to city, so if the house is outside Toronto, start with legal basement apartment rules by GTA city. When you are ready, see how we build a legal basement apartment from the first check to the final inspection.

Frequently asked questions

How do I find out if a basement apartment is legal in Toronto?

Check three things: zoning allows a secondary suite, a building permit for the second unit was issued and closed after inspections, and the electrical work was inspected. Use the City’s permit status search, a Property Information Report and the building records.

Is there a list of legal basement apartments in Toronto?

There is no single search that answers it. The City’s online search shows only recent permits, so older suites need a Property Information Report or a building records request.

Does a separate entrance make a basement apartment legal?

No. An entrance, a kitchen and a bathroom make it usable, not legal. It needs zoning permission, a permit with passed inspections, and fire and electrical safety.

Is an old basement apartment grandfathered?

Not automatically. Ontario’s Fire Code has rules for two-unit houses that existed on or before July 14, 1994, and the suite still has to meet them.

How much does it cost to make a basement apartment legal?

In the GTA a legal basement suite starts from about $55,000 where the ceiling height and entrance already work. A new entrance, more height or new services add to it. Your exact price comes in a fixed, itemized quote after a free visit.

Sources

• Secondary suites overview, City of Toronto (checked November 9, 2026)
• Secondary suites permit guide, City of Toronto (checked November 9, 2026)
• Building permit application and inspection status, City of Toronto (checked November 9, 2026)
• Property Information Report and Request building records, City of Toronto (fees effective January 1, 2026; checked November 9, 2026)
• Two-dwelling unit houses (basement apartments), Toronto Fire Services (checked November 9, 2026)
• Add a second unit in your house, Government of Ontario (checked November 9, 2026)

General information, not legal advice. Confirm your property’s status with Toronto Building and a real estate lawyer before you buy, rent or renovate.