Montreal Renovation Permits: A 2026 AI-Assisted Guide (Plateau, NDG, Verdun, Mile-End)
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.
What needs a permit in Montreal
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.
Permit always required
- ✕Wall removal (load-bearing or not)
- ✕Adding or moving exterior windows or doors
- ✕Modifying the facade in any visible way
- ✕Subdividing units or changing unit count
- ✕Adding plumbing fixtures
- ✕Adding electrical circuits or panel upgrades
- ✕Roofing in heritage zones
- ✕Decks, balconies, fences over ~2m
Permit usually NOT required
- ✓Painting (interior and most exterior)
- ✓Refinishing floors
- ✓Replacing fixtures with same-size fixtures
- ✓Cabinet replacement
- ✓Replacing windows of the same size (non-heritage zones)
- ✓Most flooring work
Borough-by-borough quick reference
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.
How to file a permit (the human way)
- Go to your borough website (not the city) — each has its own portal
- Identify your project type (interior renovation, exterior renovation, addition, demolition)
- Submit drawings, structural opinion if applicable, photos, and the fee (CAD $200–$2,000+ depending on scope)
- Wait. Check the portal weekly.
- Schedule inspector visits before, during, and after work
Real timing case studies
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.
Cost ranges to budget for
| 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 |
How AI is starting to handle this
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.
FAQ
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.
Planning a Montreal renovation?
Compozit Vision handles design and sourcing today. Permit intelligence (Check) ships Q4 2026. Get on the waitlist to be first.
Try Compozit Vision