Borough-by-borough Montreal renovation permit guide for 2026. What needs a permit, what each borough requires, real timelines, and how AI is starting to handle the paperwork.
Montreal is the most rewarding place in North America to renovate. It's also one of the trickiest. Every borough has its own rules. Heritage zones, rental restrictions, structural requirements, electrical rules — they change at the borough line. Below is the practical guide every homeowner should have the day they buy a triplex.
Note: Laws change. This reflects the state of play in spring 2026. Always verify with your borough before pulling any permit.
Almost everything visible from the street needs one. Most things that touch structure, electrical, plumbing, or facade need one. Cosmetic interior work usually doesn't.
Plateau-Mont-Royal The strictest borough. Pre-application meetings often required for facade work. Heritage zone enforcement is real. Wall removal almost always requires a structural engineer's letter regardless of load-bearing status. Expect 4–6 weeks for non-trivial permits.
Le Sud-Ouest (Saint-Henri, Verdun adjacency) Faster than Plateau. Industrial heritage in some sectors adds review time. Major facade changes require borough sign-off.
Mile-End / Outremont Strict on heritage and zoning. Subdivision work is heavily reviewed. Outremont requires advance applications for tree removal during renovation.
Notre-Dame-de-Grâce (NDG) Mid-tier complexity. Most single-family work is fast (2–3 weeks). Triplex subdivision is where it slows down.
Verdun Surprisingly accessible. Verdun has actively worked to streamline permits. Standard renovation permits move in 1–2 weeks if your file is complete.
Rosemont-La Petite-Patrie Mid-tier. Standard timelines (2–4 weeks). Heritage rules apply on a few specific streets.
Mile-End duplex — wall removal Permit submitted with structural engineer's letter on a Monday. Borough requested a clarification Wednesday (sealed drawing required). Approved 18 days later. Total elapsed: 4 weeks.
Plateau triplex — facade window enlargement Submitted with full elevation drawings and heritage-impact note. Heritage review committee scheduled for the following month. Approved with conditions 7 weeks after submission.
Verdun single-family — kitchen renovation, no structural changes Submitted online with photos and basic plumbing schematic on a Friday. Permit issued the following Wednesday. 5 days total.
Outremont addition — second-floor bedroom over existing garage Pre-application meeting required. Submitted 3 weeks after the meeting. Heritage review and zoning checks added 5 weeks. Approved with conditions 11 weeks after first submission.
| Item | Cost range (CAD) |
|---|---|
| Renovation permit (basic) | $200–800 |
| Renovation permit (complex / structural) | $800–2,000 |
| Structural engineer's letter | $400–1,000 |
| Heritage impact statement | $1,500–3,500 |
| Architect's stamp (if required) | $1,500–5,000 |
| Total permit-related budget on a kitchen reno | $1,500–4,000 |
| Total permit-related budget on a structural reno | $4,000–12,000 |
The category of "AI building permit assistant" barely existed in 2024. By 2026 it's emerging. Most tools are generic — they tell you "you might need a permit" without knowing your borough.
Compozit's Check lens is built for Quebec and Montreal specifically. Borough-by-borough rules. Heritage zone awareness. Structural risk flags before you swing a hammer. Permit application checklists per project type. Expected timelines per borough. Check ships Q4 2026.
Do I need a permit to paint my facade? In a heritage zone, yes (and you may need a specific paint palette). Outside heritage zones, usually no — but verify.
Do I need a permit to renovate my kitchen? If you're not moving plumbing or electrical, usually no. If you're adding a fixture or moving the sink, yes.
How long does a Montreal permit take? Verdun and NDG are fast (1–3 weeks). Plateau and Outremont are slow (4–8 weeks). Heritage zones add review time.
What does a Montreal renovation permit cost? $200–$2,000+ depending on borough and scope. Complex projects with engineer letters can hit $5k all-in.
Can AI just file the permit for me? Not recommended. Permit filings are legal documents tied to your name. AI helps you prepare correctly. You file.
Are heritage zone rules really enforced? Yes. Plateau and Outremont actively inspect facade work. A non-compliant paint color or window pattern can trigger a stop-work order and a fine.
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