Selling a Home With Unpermitted Renovations in Ontario: What Surfaces at Closing
Basements, decks, additions — how work done without a building permit gets exposed, and a seller’s three real options
Can unpermitted renovations cause problems when selling a house in Ontario?
Yes. Work done without a building permit — basement apartments, decks, additions, DIY electrical or plumbing — can surface at closing through the buyer’s title and requisition search, municipal open permits and work orders, an insurer’s refusal to bind coverage, or a lender’s appraisal. Consequences range from a price cut to the buyer walking away. In Ontario a seller has a duty to disclose known latent defects.
Source: Ontario Building Code Act; municipal Building Departments (2025)
In my deals I see this again and again: a house shows beautifully, the basement has a finished apartment with a kitchen, the backyard has a big new deck — all done by the owner or an unlicensed handyman to save a few thousand dollars in permit fees. Then, two weeks before closing, a requisition letter from the buyer’s lawyer unravels the whole thing. Here is how unpermitted work actually gets exposed when you sell, and the three ways a seller can handle it. To protect privacy, the story below is a composite of several real files — no specific client or address.
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First, what a building permit actually governs
In Ontario, building permits are authorized under the Building Code Act and issued by each municipality’s Building Department. A permit is not about whether your reno looks nice — it is about whether the structure, fire separation, electrical and plumbing meet safety code. Work that typically needs a permit: converting a basement into a self-contained apartment (fire separation, egress windows, ceiling height), a deck above a certain height or size, an addition, moving a load-bearing wall, and any new or altered electrical or plumbing. After the work, a municipal final inspection is required before the permit is officially closed.
💡 A permit is really a third party vouching that the work is safe. When you sell, the buyer, their lawyer, the insurer and the lender all want to see exactly that endorsement.
⚠️The real danger isn’t the unpermitted work itself — it’s stating on an SPIS or verbally that there is none when you know there is. In Ontario a misleading statement can be actionable after closing, a far bigger risk than the price concession honest disclosure costs you.
Why permits bite hardest at sale time
While you live there, unpermitted work usually sits quietly — nobody is checking. Selling is a concentrated physical: the buyer, the buyer’s lawyer, the mortgage appraiser and the insurer all examine the property at the same moment. If any one of them gets stuck, the deal is at risk. Here is each channel through which the problem tends to surface.
The buyer’s lawyer: title search and requisitions
Before closing, the buyer’s lawyer runs a title search and municipal searches. An open permit — one that was pulled but never closed with a final inspection — shows up directly, and the lawyer sends a requisition letter demanding the seller clear it before closing. Ontario courts have recognized an unclosed active permit as valid grounds for a buyer to terminate the agreement.
Municipal work orders and violations
If a neighbour ever complained or bylaw enforcement visited, the property may carry a work order — an order to remedy a violation. These records attach to the address and appear the moment the buyer searches. With an outstanding work order, many buyers’ lawyers will simply advise their client not to close.
The insurer refuses or reprices coverage
A buyer must have home insurance bound before closing. During underwriting, if the insurer finds a basement apartment, DIY wiring or other unpermitted items, it may decline, exclude the item, or price it up sharply. No insurance means the lender will not fund — and the deal stalls.
⚠️A basement apartment with a kitchen is the most heavily scrutinized item of all — fire separation, egress windows, second-unit registration. It is a hotspot for both insurance refusals and municipal work orders, so check it before you list.
The appraiser flags it
The lender orders an appraisal before funding. If the appraiser spots an open permit or clearly non-compliant work, they may lower the value or note the issue, so the buyer no longer qualifies for the mortgage amount they planned. The gap between price and down payment blows open — and many deals collapse right here.
The seller’s disclosure duty: can you just say nothing?
The Ontario rule is: a seller must disclose known latent defects — hidden problems, especially those affecting safety or habitability. Knowingly concealing one, or making a misleading statement about it, can expose you to a claim for remediation costs or damages after closing. The Seller Property Information Statement (SPIS) is voluntary, but once you fill it in you must be truthful — a wrong answer is riskier than no form at all. ‘I didn’t know’ only works if you genuinely didn’t; for work you did yourself, that is a hard position to defend.
Three ways to handle it (decide before you list)
If you know there is unpermitted work on your title, don’t wait for the buyer’s lawyer to raise it. I usually give sellers three options, ranked by recover-value vs. least-hassle vs. fastest:
Get a retroactive permit (permit after the fact)
Apply to the municipality for a permit after the fact — typically requiring a BCIN designer to produce drawings of the existing work, a municipal inspection (often opening walls), and any remediation needed to pass a final inspection. Upside: the title is clean, the house sells normally and price isn’t discounted. Cost: money and time, and in the worst case the municipality may require you to tear out and rebuild. Best for sellers with time who want full value.
Price adjustment plus honest disclosure
Don’t get the permit, but disclose the work openly at listing and build the buyer’s future permit/remediation cost into the price. Upside: fast, transparent, lowers your after-sale litigation risk. Cost: you give up price, and some buyers may still get stuck at the financing or insurance stage. Best for sellers who want a quick close and can accept a discount.
Sell as-is to a narrower buyer pool
Sell strictly as-is with no remediation promises, targeting investors or buyers willing to deal with it themselves. Upside: least hassle for the seller. Cost: the buyer pool shrinks noticeably and leverage shifts to the buyer, so this usually nets the least of the three. Best when the issue is large and you have no appetite to fix it.
💡 All three paths start the same way: find out what is actually on your title. Paying for a municipal permit and work-order search before you list is always cheaper than getting bounced by the buyer’s lawyer before closing.
Frequently Asked Questions
Nobody ever checked while I lived here — will it really surface when I sell?
Not being checked as an owner-occupant tells you nothing about selling. At closing the buyer’s lawyer runs a title search and municipal searches; open permits and work orders are public records that appear immediately. Insurance underwriting and the lender’s appraisal are two more independent gates. Quiet occupancy and a concentrated sale review are two different things.
What’s the difference between an open permit and a work order?
An open permit means a permit was pulled but never closed with a final inspection — the problem is an unfinished process. A work order is issued after the municipality finds a violation — the problem is that non-compliance is already established. Both attach to the address and both get flagged by the buyer’s lawyer, but a work order is usually the more serious of the two.
How long does a retroactive permit take, and is approval guaranteed?
It’s not guaranteed and it varies by municipality, the type of work, and whether the existing condition meets code. A simple item might take a few weeks; anything requiring opened walls and remediation takes longer, and worst case the municipality requires tear-out and rebuild. That’s why you start this path before listing — not after you’ve accepted an offer, when there simply isn’t time.
If I sell as-is, do I still have to disclose?
Yes. As-is means the seller promises no remediation and delivers in current condition, but it does not waive your duty to disclose known latent defects. Knowingly hiding safety-related unpermitted work can still expose you to a claim after closing, even with an as-is clause. As-is governs whether you fix it; disclosure governs whether you tell.
How much will a buyer knock off the price for unpermitted work?
There’s no fixed number — it depends on the type of work, the remediation cost, and whether the buyer is an occupant or an investor. The real issue isn’t the discount, it’s that unpermitted work shrinks the buyer pool and stalls some buyers’ financing and insurance, which weakens your leverage. Price it only after you understand the buyer’s true cost to permit or remediate.
Arthur Zhao
Real Estate Broker · FRI · ABR · SRS · PSA · MCNE · E-PRO · CLHMS & GUILD Elite · REAIS
VP & Branch Manager, Bay Street Group Inc.
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