Permit Guides › Montreal › Home Addition
📍 Montreal, Quebec

Home Addition Permit
in Montreal

Do you need a permit for a home addition in Montreal? Get the full requirements, fees, timeline, and official contacts — all in one place.

Always Required Typical fee: $500–$3000 Processing: 6–16 weeks

Permit Requirements

  • ✓ Building permit always required for any addition
  • ✓ Structural drawings by a licensed engineer typically required
  • ✓ Zoning approval needed — setback requirements must be met
  • ✓ Electrical and plumbing sub-permits required
  • ✓ Survey may be required to confirm lot coverage limits
✅ Exemptions
No exemptions — all additions require a permit regardless of size.

Required Inspections

1
Foundation/footing
2
Framing
3
Rough-in electrical & plumbing
4
Insulation
5
Drywall
6
Final

How to Apply in Montreal

1
Check if you need a permit
Review the requirements above. For a home addition, a permit is always required.
2
Prepare your documents
Gather drawings, site plans, and specifications. For larger projects, you may need drawings stamped by a licensed engineer or architect.
3
Submit to Direction de l'urbanisme
Apply online at https://montreal.ca or visit in person at 800 Boul. De Maisonneuve E, Montréal, QC H2L 4L8.
4
Wait for approval
Montreal typically processes home addition permits in 6–16 weeks. You will receive a permit number when approved.
5
Post permit & book inspections
Post your permit on site. Book required inspections at each stage — do not cover work before it is inspected.

FAQs — Home Addition Permit in Montreal

How much does a home addition permit cost in Montreal?
Home Addition permit fees in Montreal typically range from $500–$3000. Fees are usually based on the estimated project value. Contact Direction de l'urbanisme at 311 to get an exact quote for your project.
Can I do my own home addition without a contractor?
Homeowners can often pull their own permits for work on their primary residence. However, electrical and plumbing work typically requires a licensed trade. Check with Direction de l'urbanisme for specific rules.
What happens if I skip the permit?
Unpermitted work can result in fines, orders to undo completed work, problems with home insurance claims, and difficulty selling your home. It is always worth the time to verify permit requirements.
Official Permit Office
Direction de l'urbanisme
Phone
311
Processing Time
4–14 weeks
💡 Montreal permits are issued by borough offices (arrondissements). Contact your specific borough for exact requirements.
Visit Permit Office ↗
💰 Also see: Home Addition costs in Montreal
Get a free itemized budget estimate for your project before you apply for your permit.
View Cost Guide →
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