How Much Does a Home Addition Cost in Montréal? (2026)
Montréal sits close to the national average for renovation costs. Labour is reasonable, but French-language documentation requirements and Quebec's specific building code add planning complexity.
Get My Free Montréal Budget →Estimated Cost in Montréal
$80,000 – $350,000
2026 estimate · most projects land around $215,000
Get My Exact Quote →Timeline
16–52w
Montréal's renovation season is heavily weighted toward May–October. Winter work is possible for interiors but trades are busy.
Permits
Required
Montréal permits (permis de construction) require French-language submissions and typically take 3–8 weeks. Some boroughs have their own additional requirements.
Live Market Data
Renovation Activity in Montréal
Permits Issued (12 mo)
15,880
+28.0% vs last year
Active Projects
17,594
Currently tracked in Montréal
Avg Permit Value
$35K
Montréal market average
Data updated 2026-05-27. Source: RenoIntel — permit tracking across Canadian municipalities.
Cost Breakdown for Montréal
Dollar estimates below are calculated using Montréal's local market multiplier against national averages.
| Category | % of Budget | Est. Cost Range |
|---|---|---|
| Foundation & Structure | 25% | $20,000 – $87,500 |
| Framing & Exterior | 20% | $16,000 – $70,000 |
| Interior Finishing | 20% | $16,000 – $70,000 |
| Mechanical (HVAC, Plumbing, Electrical) | 18% | $14,400 – $63,000 |
| Architectural & Engineering | 7% | $5,600 – $24,500 |
| Permits & Inspections | 5% | $4,000 – $17,500 |
| Contingency | 5% | $4,000 – $17,500 |
Estimates are for guidance only. Get a free personalized budget at renoplanner.ai.
What Drives Cost in Montréal?
- ✓Addition type — single-storey rear vs. second-storey vs. garage conversion
- ✓Foundation requirements — slab vs. crawlspace vs. full foundation
- ✓Exterior matching — matching existing siding, brick, or stone is more expensive
- ✓Mechanical extensions — running new HVAC, plumbing, and electrical to the addition
- ✓Permit timeline — in major cities this can take 3–6 months for additions
Frequently Asked Questions
How much does a home addition cost in Montréal?
A home addition in Montréal typically costs between $80,000 and $350,000 in 2026. The midpoint for a typical project is around $215,000. Costs in Montréal are close to the Canadian national average due to montréal sits close to the national average for renovation costs.
What factors affect home addition costs in Montréal?
Key cost drivers in Montréal include local contractor labour rates, material availability and delivery costs, permit requirements, and project scope. Montréal sits close to the national average for renovation costs. Labour is reasonable, but French-language documentation requirements and Quebec's specific building code add planning complexity.
Do I need a permit for a home addition in Montréal?
Yes, a home addition in Montréal typically requires a building permit. Montréal permits (permis de construction) require French-language submissions and typically take 3–8 weeks. Some boroughs have their own additional requirements.
How long does a home addition take in Montréal?
A typical home addition in Montréal takes 16–52 weeks from start to completion, not including planning and permit time. Montréal's renovation season is heavily weighted toward May–October. Winter work is possible for interiors but trades are busy.
How do I find a reliable contractor for my home addition in Montréal?
RenoPlanner matches Montréal homeowners with vetted local contractors who specialize in home additions. All contractors on the platform are pre-screened. You can create a free project plan and receive matched contractor quotes at renoplanner.ai.
Home Addition Cost in Other Cities
Home Addition Cost in Toronto$104,000 – $455,000Home Addition Cost in Mississauga
$100,000 – $438,000Home Addition Cost in Brampton
$98,000 – $427,000Home Addition Cost in Vaughan
$100,000 – $438,000Home Addition Cost in Markham
$100,000 – $438,000Home Addition Cost in Richmond Hill
$99,000 – $434,000 See all cities →
Other Renovations in Montréal
Kitchen Renovation Cost in Montréal$18,000 – $85,000Bathroom Renovation Cost in Montréal
$8,000 – $38,000Basement Finishing Cost in Montréal
$22,000 – $70,000Roof Replacement Cost in Montréal
$7,000 – $30,000Deck & Patio Cost in Montréal
$10,000 – $55,000 See all renovation types →
Ready to Budget Your Montréal Home Addition?
The estimates above are ranges. Your exact budget depends on your home, your scope, and your specific choices. RenoPlanner builds a free itemized budget for you in 3 minutes — then matches you with vetted Montréal contractors who can quote on your real scope.
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What you get — free:
Itemized budget with local Montréal pricing
Cost breakdown by materials, labour & permits
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Project timeline and permit checklist
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