Selling a house with unpermitted work in Toronto: what to disclose and how to fix it
Unpermitted work does not stop a sale by itself, but it is one of the most common reasons deals stall, reprice or collapse after the buyer's lawyer starts digging. If you are selling a home in Toronto with a finished basement, an addition, a deck or any other change that was built without a building permit, the best move is to deal with it before you list, or at minimum to disclose it clearly and plan for it.
This guide is for Toronto and GTA homeowners and their agents. It explains what counts as unpermitted work, why it matters at closing, what you should disclose, and the practical steps to legalize the work with as-built drawings and a permit application.
What counts as unpermitted work
Unpermitted work is any construction that needed a building permit under the Ontario Building Code and municipal rules but was done without one, or was started under a permit that was never closed out. Typical examples in Toronto and the GTA:
Finished basements, especially with new bedrooms, bathrooms or a separate entrance
Second units and basement apartments that were never registered or inspected
Rear, side or second-storey additions and enclosed porches
Removed or altered load-bearing walls, new beams or changed openings
Decks above the height or size that triggers a permit
New or relocated plumbing, drains, and HVAC work
Garage conversions and detached structures such as garden suites or large sheds
Two cases catch sellers off guard. First, work done by a previous owner is still your problem once you own the house. Second, a permit that was opened but never finalized (an open permit) shows up in searches just like work with no permit at all.
Why it matters when you sell
Most problems surface after an offer is accepted, which is the worst time to find them. Buyers' lawyers routinely search the city for open permits, outstanding work orders and zoning issues, and a clean-looking listing can fall apart on that search.
Buyer and lawyer: The buyer can ask you to fix the problem, cut the price, or walk away under a condition. Open permits and work orders stay with the property, so they become the buyer's burden.
Lender: Some lenders will not fund, or will reduce the mortgage, when the appraised value includes space that is not legal.
Insurer: An insurer can refuse or limit a claim for damage tied to unpermitted work, which makes some buyers nervous about taking the house at all.
Value: Appraisers and buyers may give little or no value to an unpermitted basement apartment or addition, even if it looks finished.
The city: Toronto Building can require you to apply for a permit retroactively, open up finished walls for inspection, or bring the work up to Code, regardless of how long ago it was built.
The cost of fixing a problem under deadline, with a closing date approaching, is almost always higher than fixing it before you list.
What to disclose
In Ontario, sellers are generally not required to volunteer every flaw in a house, but they cannot hide a known problem or answer questions falsely. Misrepresentation, and concealing a latent defect that makes a home unsafe or unfit to live in, can lead to claims after closing. The safest rule is simple: if you know the work was done without a permit, say so in writing.
Answer the seller property information form honestly. If your agent uses a seller property information statement, questions about renovations, permits and work orders must be answered truthfully. "Unknown" is acceptable only if it is true.
Disclose what you know. That includes work you did, work you paid for, and work you were told about by the previous owner.
Describe it specifically. Name the work (for example, basement finished in 2015, no permit located) rather than a vague "as is" statement.
Put it in the agreement. Your lawyer can add clear wording to the agreement of purchase and sale so the buyer acknowledges the disclosure.
Do not rely on "as is" alone. An "as is" clause does not protect a seller who knowingly misrepresented or concealed something.
This post is general information, not legal advice. Talk to your real estate lawyer before you list so the disclosure wording fits your situation.
How to fix it before you list
Legalizing existing work follows a predictable path. Starting early gives you room for city review and any corrections.
Find out what is already on file. Ask the city, such as Toronto Building, for the permit history of the property. This shows what was permitted, what is still open and whether any orders exist.
Document what was actually built. An as-built drawing set records the existing floor plans, sections and key construction details so the city can review the work as it stands today.
Check zoning and Code compliance. Ceiling heights, egress windows, fire separations, smoke and carbon monoxide alarms, and setbacks are common trouble spots. Some items can be fixed easily; others affect whether the space can be legalized.
Apply for the permit. Submit the as-built drawings with the building permit application, along with any required engineering or consultant reports.
Respond to examiner comments. The city may request revisions or additional information before issuing the permit.
Book inspections and open up as needed. Inspectors may need to see framing, insulation, plumbing or electrical that is now behind finished walls. Plan for some opening up.
Complete the corrections and close the permit. The permit is only finished once the final inspection passes. A closed permit gives the buyer's lawyer something clean to find.
Timing varies by how much work needs correcting and how busy city review is, so start as soon as you decide to sell.
If you cannot fully fix it before listing
Sometimes the timeline, budget or condition of the work makes a full fix unrealistic. You still have options, and each one depends on honest disclosure.
Sell with disclosure: List the property, disclose the unpermitted work and let the buyer decide. Trade-off: a smaller buyer pool and likely price pressure.
Price adjustment: Reduce the price to reflect the cost and risk of legalizing. Trade-off: a faster sale, but you absorb the cost either way.
Holdback or credit: Agree a closing credit or holdback so the buyer can complete the permit work. Trade-off: it needs careful lawyer-drafted terms.
Partial fix: Complete the as-built drawings and apply for the permit before listing, even if it is not closed. Trade-off: it shows good faith and a clear path, but the permit stays open.
Remove or restore: Return the space to its permitted condition. Trade-off: it can cost more than legalizing, and may reduce living space.
Your agent and lawyer can help you choose, based on the work involved and your timeline.
How Casabuilt helps
Casabuilt specializes in as-built drawings for Toronto and GTA homes, the document the city needs to review existing work and the one most sellers do not have. We measure the house, produce accurate floor plans and sections of what was actually built, and prepare drawings suitable for a building permit application.
Measured as-built drawings of existing basements, additions and renovations
Drawings prepared for permit submission, working alongside the Cadaxx permit team
Clear drawings that help your agent and the buyer's lawyer see exactly what exists
Post-storm or flood documentation for insurance
If you are thinking of selling a Toronto home with unpermitted work, contact Casabuilt before you list. We can tell you what the city is likely to need and help you build a plan that fits your timeline.
Frequently asked questions
Does the age of the work matter? Not for permit purposes. The city can require a permit for work built years ago, so older work is not automatically safe.
Can I sell without fixing it? Yes, in most cases, as long as you disclose honestly. Expect questions, conditions or a lower offer.
Will the city find out if I apply for a permit? An application for existing work is a normal legalization route. Speak with your design professional about what to expect before you submit.
Do I need as-built drawings if I plan to sell as-is? They are not mandatory for a sale, but they help the buyer's side understand exactly what exists and can make the deal easier to close.
Who should I talk to first? Your real estate lawyer for disclosure wording, and a design professional for what it would take to legalize the work.
Final word
Unpermitted work is manageable when you find it early, disclose it honestly and have a clear plan. Waiting until the buyer's lawyer finds it usually costs more time and money. If you want to know where your house stands, Casabuilt can help you start with accurate as-built drawings.
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