Are Basement Apartments Legal in Toronto?

Basement contractors in Toronto for walkout basementAs a basement waterproofing company in Toronto, sometimes we come in to waterproof a basement or repair a foundation because the home owner is finishing their basement so it can become a rental unit.  We’ve been asked in the past by homeowners whether a basement apartment is legal in the city of Toronto.  Our answer is “it depends”.  There are several criteria that must be met in order for a basement apartment is to be considered legal or not. Most professionals in real estate and the construction industry would have a hard time answering this question as it’s very complex.

Some regulations are retrospective, while others are in force regardless of timelines.  Below is a brief outline of several factors that go into determining the legality of a basement dwelling in Toronto, though you must contact a lawyer for legal advice to truly determine if it’s legal or not.

Differences in construction methods, confusing time-frames and complicated rules make the answer to this complex. The following summary provides a general background. Home buyers should check details carefully before buying based on first impressions, and risking expensive consequences later.

The same applies to sellers and their agents. The days of a terse “retrofit not warranted” are no longer sufficient. They are advised to make more complete disclosure of compliance. However it remains the buyer’s duty to inspect the premises in terms of law.

Finishing a walkout basement in Toronto

Fire Regulations

This is the only section of the Ontario building code that is retrospective. This means that a once-compliant basement may no longer be so. Requirements for basement apartments include:

  • Dry walls between a basement and main dwelling must have a thirty-minute fire-rating.


  • There must be an alternative exit. This can be a basement window, provided it complies with size and positioning rules.


  • A basement must have a smoke detector (connected to the main house if the fire rating is in doubt).


  • Some municipalities require a carbon monoxide detector in addition.

The only sure way to confirm legality is to obtain a retrofit compliance certificate from the local fire department. Some sellers arrange these to encourage buying confidence.

Other Building Regulations

Changes to general building regulations are not retrospective. Basements built pre-1995 are exempt because there were no laws applying to them at the time. More modern ones (and older ones without evidence of construction dates) must meet the following requirements in order to be used as apartments:

  • The minimum height is 6 foot 5 inches measured from floor to ceiling.


  • The entrance opening must be at least 32 inches by 78 inches.


  • Bathrooms must have either windows or exhaust fans.


  • Parking space must be evenly distributed in the case of multi-apartments.


  • A valid certificate of electrical compliance is necessary.

Ceiling Height

Some older basements fail to meet the ceiling-height requirement because they were originally built for storage, not habitation. Techniques exist for lowering basement floors without affecting structural integrity. A buyer contemplating this should allow for the cost of construction work (and total re-fitment afterwards) in their calculation of total purchase price.  In some locals, have full length windows or a walkout basement may be a requirement for a legal basement apartment.

In Summary

The rules that are summarized here are necessary to ensure safe, comfortable basement apartments, and merit compliance for this reason alone. The homeowner who chooses to ignore them risks stiff fines from city inspectors – and having to vacate apartments and forfeit rental income too.


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NuSite Group is a Toronto based basement waterproofing and foundation repair company that specializes in Basement Waterproofing, Basement Lowering, and Foundation Repairs. Call us today at 416-622-7000 or 905-731-1228 for a free in-home estimate and inspection.

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Mark Lipton - Homestars Review

Basement Waterproofing

Our basement leaked! Of course . . . we bought a 100 year old house! But my office needed to be in the basement permanently. I interviewed 10 different companies until we decided on the Steinbergs and their crew at Nu-Site! They are professional, reliable, courteous, honest, and they really make an effort to communicate with the client about every step of the process.

Sara Jack - Homestars Review

Foundation and Waterproofing Repairs

After several years of chronic leaks, we decided to have our basement waterproofed once and for all. The team over at Nusite was professional, answered my questions during the project and stayed within their quoted price....which is always a concern for me when working with contractors. Great job overall

Joshua Persaud - Yellowpages Review

Basement Waterproofing

Had several cracks in my basement wall and they would leak whenever we had a heavy rain. It started about a year and a half ago and seems to have gotten worse over the past 6 months. I tried having my neighbor seal it, but it started leaking again within a few weeks. Called several waterproofing companies and got several quotes. Finally went with Nusite contractors for the job. They gave a reasonable quote and I liked the guy that came by for the estimate. They stayed within budget and cleaned up before they left. It's been almost 3 months now and it seems to be working great.