Montréal ADU, Parking & Rental Bylaw Checklist

Housing and Building Standards Quebec 3 Minutes Read · published February 11, 2026 Flag of Quebec

Montréal, Quebec homeowners considering an accessory dwelling unit (ADU), secondary suite or rental must follow municipal zoning, parking and building-permit rules before renting or renovating. This checklist explains where ADUs are allowed, parking expectations, permit steps and enforcement routes in Montréal, and points you to official city pages and departments for applications and complaints. Use the action steps below to apply, verify parking requirements, report violations and appeal decisions.

Where ADUs are allowed and basic size rules

Zoning and urban planning determines whether a secondary dwelling is permitted on a lot, and the allowed size or unit count can depend on lot area, existing dwelling type and neighborhood sector. Check the City of Montréal guidance on accessory dwellings for zone-specific rules and examples [1].

A building permit is usually required before creating a new ADU.

Parking, access and utilities

Municipal rules can require off-street parking or may waive minimums depending on the borough and zoning. Verify local parking standards and any residential permit parking zones before converting space to a rental [2].

  • Confirm off-street parking minimums or exemptions with your borough planning office.
  • Ensure separate entrances or fire-separation measures meet the Québec Construction Code and local building permit conditions.
  • Account for development charges or fees associated with new units when budgeting.
Utilities and separate meters may be required by the building inspector or utility provider.

Penalties & Enforcement

Enforcement is handled by municipal inspections and by-law officers. Specific fine amounts or daily penalties for unauthorized ADUs, illegal rentals or parking infractions are not specified on the cited city pages; check the borough enforcement page or municipal code for exact figures [1].

  • Enforcer: By-law Enforcement and the borough's urban planning/inspections services are the primary enforcers.
  • Fines: not specified on the cited page; see borough code or contact the enforcement office [1].
  • Escalation: first offence, repeat or continuing offence procedures and ranges are not specified on the cited page.
  • Non-monetary sanctions: orders to cease occupancy, orders for demolition or compliance, and court referrals are used to enforce contraventions.
  • Inspection and complaint: report suspected illegal rentals or unpermitted alterations through the borough complaints portal or by-law enforcement contact.

Applications & Forms

Most ADU projects require a building permit and possibly a zoning certificate; the city guidance points applicants to the standard permit application process rather than a single ADU form [1]. Fees and required documents are listed on the building-permit pages or borough permit counters.

Action steps for homeowners

  • Check zoning: confirm ADU is allowed on your lot with borough urban planning.
  • Apply for a building permit and submit required plans to the borough permit office.
  • Pay fees and obtain inspections at stages required by the permit.
  • Report non-compliant rentals or unresolved neighbour issues to By-law Enforcement if needed.
Always obtain written permit approvals before leasing an ADU to avoid enforcement actions.

FAQ

Do I need a permit to create an ADU in Montréal?
Yes. Most conversions require a building permit and possibly a zoning certificate; check with your borough's permit office for required documents.
Are there minimum parking requirements for ADUs?
Parking rules vary by zone and borough; some areas may waive new parking minimums while others require off-street parking.
What if a neighbour rents an unpermitted unit?
You can file a complaint with By-law Enforcement or your borough inspections service to trigger an inspection.

How-To

  1. Confirm zoning: contact borough urban planning or use the city zoning lookup to confirm ADU permission.
  2. Prepare plans: hire a qualified designer or architect and prepare drawings meeting the Québec Construction Code.
  3. Submit permit: apply for a building permit with the borough and attach required documents and fees.
  4. Complete inspections: schedule and pass required inspections during and after construction.
  5. Register and rent: once permitted and inspected, you may rent the unit following municipal and provincial rental rules.

Key Takeaways

  • Always verify zoning and obtain permits before creating or leasing an ADU.
  • Parking rules differ by borough—confirm requirements early.
  • Use borough enforcement channels to report unpermitted units.

Help and Support / Resources

  1. [1] City of Montréal - Accessory dwellings guidance
  2. [2] City of Montréal - Parking and residential permits

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