Planning a renovation in Montreal? Before you swing a hammer or sign a contractor’s quote, you need to understand one thing: a renovation permit in Montreal is required for most construction, alteration, and exterior work — and skipping it can cost you far more than the permit itself.
Whether you just purchased your first property (check out our first-time home buyer guide for the full breakdown) or you’re renovating to boost resale value before listing, this guide covers everything: when you need a permit, what it costs, how to apply, and the mistakes that trip people up.
The short answer: for almost any work that changes a building’s structure, exterior appearance, or use. Here’s what requires a permit:
The rule of thumb: if the work affects structure, exterior, safety, or zoning, you need a permit.
Not everything requires a trip to your borough office. These projects are generally permit-free in Montreal:
Important caveat: If your property falls within a heritage protection zone (SPAIP), even minor exterior changes like repainting your front door a different colour can require approval. More on that below.
Montreal uses a straightforward formula to calculate permit fees:
Cost of work ÷ 1,000 × $9.80
So if your renovation costs $50,000, the permit fee is:
$50,000 ÷ 1,000 × $9.80 = $490.00
There are floors you can’t go below:
| Property Type | Minimum Permit Fee |
|---|---|
| Residential | $167.40 |
| Commercial / Industrial / Institutional | $491.70 |
Even a small $5,000 bathroom reno in a residential property would technically calculate to $49.00, but you’ll pay the $167.40 minimum instead.
Permits have an expiration date. If your project runs longer than expected (and they often do), renewing costs 25% of the original permit fee, with the same minimums applying. Don’t let your permit expire — working without a valid permit is the same as working without one at all.
Every borough in Montreal handles permit applications, and the process can vary slightly depending on where your property is located. Across Montreal neighborhoods, the general process follows these steps:
Montreal has 19 boroughs, each with its own urban planning regulations. What flies in Lachine might not be permitted in Plateau-Mont-Royal. Before you start, visit your borough’s office or website to confirm specific rules for your area.
If you’re renovating in the West Island, keep in mind that municipalities like Pointe-Claire, Dorval, and Kirkland have their own permit processes separate from the City of Montreal’s boroughs.
A complete application typically requires:
Submit your complete package to your borough’s permit office. Incomplete applications are the number-one cause of delays — missing a site plan or unsigned form can add weeks.
Typical processing times:
Once approved, you’ll receive your permit document. It must be posted visibly at the work site for the entire duration of the project. Inspectors can and do check.
Depending on the scope, your borough may require inspections at various stages — foundation, framing, final. Don’t cover up work before it’s been inspected.
Here’s a detail many homeowners miss: the City of Montreal does not issue permits for plumbing, electrical, or gas work. That falls under the jurisdiction of the Régie du bâtiment du Québec (RBQ).
What this means in practice:
Always verify. An unlicensed contractor doing electrical or plumbing work exposes you to safety risks, insurance issues, and potential fines. If something goes wrong — a leak, a fire — and the work was done by someone without proper licensing, your insurance company has grounds to deny your claim.
Montreal has extensive heritage protection, particularly in areas like Westmount, Old Montreal, parts of the Plateau, and Outremont. If your property falls within a Site patrimonial (SPAIP) — a heritage-designated area — the permit process adds significant complexity.
This is where Montreal gets complicated. Each borough can impose additional regulations on top of the city-wide rules. Common differences include:
Before starting any project, confirm the specific bylaws for your borough. What your neighbour did in Verdun doesn’t automatically apply in Rosemont.
The most expensive mistake. If an inspector catches unpermitted work, you can face:
If you’re planning renovations to sell your home in Montreal, unpermitted work is one of the fastest ways to derail a deal.
Missing documents don’t just delay your project — they reset the clock. Every time the borough requests additional information, your application goes back to the queue. Get it right the first time.
Designing a project based on general Montreal guidelines without checking your specific borough’s bylaws is a recipe for rejection.
Beyond the safety and insurance implications, unlicensed work can flag during permit inspections and at resale. If a contractor can’t or won’t provide their RBQ license number, that’s your answer.
Permits aren’t open-ended. If your renovation drags on (and renovations almost always take longer than planned), renew your permit before it expires. Working on an expired permit is the same violation as working without one.
Heritage zone projects consistently run over budget and over schedule when homeowners don’t account for the additional review process, restricted materials, and design iterations.
Start early. The permit timeline is the single biggest planning variable. Begin the process months before you want construction to start.
Hire experienced professionals. An architect or designer who knows your borough’s rules can prepare an application that gets approved the first time. The cost of professional plans is a fraction of the cost of delays.
Visit your borough office. A 20-minute conversation with a permit officer can save you weeks of guesswork. They’ll tell you exactly what you need.
Keep copies of everything. Your permit, plans, inspection reports, contractor licenses — keep a complete file. You’ll need it when you eventually sell.
Communicate with your contractor. Make sure your contractor understands that work cannot begin until the permit is posted. Reputable contractors know this; if yours pushes to start early, that’s a red flag.
Check the RBQ registry. Verify every trade contractor’s license before they start. It takes two minutes online and can save you enormous headaches.
Plan for inspections. Build inspection milestones into your project timeline. Don’t schedule drywall installation the day after framing — leave time for the inspector.
This comes up more than you’d think. If you’re buying or selling in Montreal, here’s what you need to know:
This is one more reason to work with a real estate team that understands these issues deeply. If you’re navigating a purchase or sale involving renovation history, contact our team — we deal with this regularly.
Getting a renovation permit in Montreal isn’t exciting. It’s paperwork, waiting, and bureaucracy. But it’s also the difference between a renovation that adds value and one that creates liability.
Do it right: check your borough’s rules, hire licensed professionals, submit a complete application, and build the permit timeline into your project plan from day one.
Your future self — and your future buyer — will thank you.
Have questions about renovating before buying or selling in Montreal? Contact Elite Real Estate Group — we help clients navigate every stage of the process.