How do you check if a renovation permit was issued?

Call your municipality's building department with your address, or search their online permit portal if one exists. Toronto, Vaughan, Markham and Richmond Hill all run public lookup tools that show active and closed permits by street address. Smaller municipalities in the GTA typically require a phone call or a counter visit. The search returns the permit number, the type of work approved, the issue date, and whether inspections have closed the file. If the portal shows nothing and you know work happened, the permit either predates the digital record or was never pulled.

You need three pieces of information to search effectively: the full street address, the approximate year the work was done, and a rough description of what changed. Structural additions, new window openings, basement underpinning, and relocated plumbing all need building permits in Ontario. Cosmetic work like painting, flooring and cabinet replacement does not, so the absence of a permit record does not always mean a violation. Kitchen renovations land in the middle: if walls moved, drains relocated, or a beam went in, a permit was required. If only the finishes changed, it was not.

How to check permits online in Toronto

Toronto's Application Information Centre portal at toronto.ca/buildingpermits lets you search by address and returns every permit and application on file since the system went digital in the mid-1990s. The record shows the permit number, the issue date, the type of work, the value declared on the application, and the inspection status. A permit marked closed means all inspections passed and the file is complete. A permit marked open means inspections are outstanding or the work stalled partway through. An application marked under review has not yet been issued.

The portal does not show work done before the digital record began, roughly 1995 to 1998 depending on the ward. For older permits you call Toronto Building's records unit and request a file search, which takes a few days and sometimes turns up microfiche or paper drawings. Pre-amalgamation permits from North York, Scarborough, Etobicoke, York and East York are indexed separately and not always digitized. If you are verifying work done in the 1980s or earlier, expect gaps. When we take on design-build services in older Toronto houses, we budget time to confirm what actually exists behind the walls, not what the permit history suggests.

What Vaughan and Richmond Hill permit portals show

Vaughan's online portal shows building permits, pool enclosure permits and second-unit registrations by address, with issue dates and inspection status visible to the public. The system is cleaner than Toronto's because Vaughan digitized later and had fewer legacy municipalities to merge. Richmond Hill runs a similar tool through their building department page, though the interface updates less frequently and some recent permits lag by a week or two before appearing online. Markham's portal covers permits issued since roughly 2005; earlier records require a call to the building department.

All three municipalities show whether a permit is open or closed, but none display the actual drawings or the engineer's stamp online. If you need to verify that structural work was engineered properly, you request the permit package from the building department, which usually costs a small records fee and takes a few business days. We did exactly this on our South Richvale modern home when the site survey showed an addition someone had enclosed decades earlier; the permit file confirmed the beam sizing and let us proceed without re-engineering.

When you need to call the building department instead

Smaller GTA municipalities including Oakville, Aurora, King Township, Whitchurch-Stouffville and East Gwillimbury do not run public online portals. You call the building department during counter hours, provide the address, and ask whether permits are on file for specific work. The clerk will search the database and read back the permit numbers, issue dates and status. Some municipalities will email a summary; others require you to visit the counter and request copies of the permit package if you need drawings or engineering details.

Even in municipalities with online portals, phone calls are faster when you are checking multiple properties, verifying work older than the digital record, or trying to understand why an inspection failed. The building department can tell you whether a stop-work order is active, whether the permit lapsed because inspections were never called, and whether a re-inspection has been scheduled. If you are buying a house and the listing mentions a finished basement or a renovated kitchen, a five-minute call before your home inspection can save you from discovering an unpermitted structural change during the lawyer's title search.

What information you need to search by address

You need the full municipal address including the unit number if the house has a legal second suite. Street name alone is not enough in subdivisions where the same number repeats across multiple streets. If the work predates a municipal amalgamation or a street renaming, you may need the old address; Toronto's system cross-references most of these automatically, but 905 municipalities sometimes require the historical name. The year the work was done narrows the search, especially in older neighbourhoods where permits stretch back decades.

Knowing what changed helps you distinguish between permits. A search on a typical North York semi might return six permits: the original house construction in 1952, a garage in 1978, a second-floor addition in 1993, a basement apartment in 2006, a kitchen renovation in 2014, and a new furnace in 2021. If you are verifying that the addition was permitted, you want the 1993 file. If you are checking whether the basement suite is legal, you want the 2006 permit and you need to confirm it included the fire separation, the egress window and the separate entrance that make a suite compliant. Understanding building permit requirements in North York before you search saves you from misreading the record.

How to verify a permit before buying a house

Order a title search and a building department records check as soon as your offer is accepted, not during the final week before closing. The title search, done by your real estate lawyer, shows work orders and zoning violations registered against the property. The building department check, which you or your lawyer request, shows whether permits were issued and closed for any addition, structural change, basement suite or garage the listing advertised. If the seller claims a renovated ensuite or a finished basement and no permit appears, you have three choices: renegotiate the price to cover the cost of bringing the work into compliance, walk away using your inspection condition, or accept the risk and buy title insurance that excludes unpermitted work.

Title insurance does not fix the work; it covers your legal costs if the municipality orders you to open walls, remove the addition, or apply for retroactive permits. Retroactive permits are possible in Ontario if the work meets the Building Code that was in force when it was done, but proving compliance usually means opening finishes for an engineer's inspection, which costs as much as doing the work properly the first time. A closed permit adds value. An open permit or no permit at all is a negotiation point worth five figures on a house with a finished basement or a structural addition. We have been called in more than once to price the correction after a sale closed and the new owner discovered the basement suite was never inspected.

What to do if work was done without a permit

If you discover unpermitted structural work, underpinning, a relocated drain, or an addition, contact the building department and ask about retroactive permit options before you start new work or try to sell. The municipality may allow you to apply for a permit after the fact if an engineer can confirm the work meets Code, which requires selective demolition to expose framing, footings or plumbing for inspection. In some cases the municipality will accept an engineer's letter in lieu of opening walls, but that depends on what was done and how much risk the building official perceives. Cosmetic unpermitted work, like a kitchen reface or new flooring, does not require retroactive permits because it never needed one.

If the unpermitted work is structural and you cannot prove compliance, you have two paths: remove it and restore the house to its permitted state, or redesign the area to current Code and apply for a full permit as if the work were new. The second path is almost always cheaper. A load-bearing wall that was removed without a permit and without a beam can be corrected by installing an engineered beam now, applying for the permit, and closing the file with inspections. The cost is the beam, the engineering, the permit fee, and the labour to open and refinish the ceiling. That usually lands between $12,000 and $25,000 depending on the span. Ignoring it and hoping the next buyer does not notice costs you more in the negotiation when they do.