Secondary Suite Permits & Bylaws - London, Ontario

London, Ontario homeowners considering a secondary suite must follow city zoning and building rules before renting or renovating. This guide explains when a development or building permit is needed, which city departments enforce requirements, and the typical steps to obtain approvals in London. It summarizes inspections, applications, common violations, and appeal routes to help property owners plan compliant conversions and avoid penalties.

What is a secondary suite?

A secondary suite is a self-contained residential unit within a detached house, semi-detached house or row house that is subordinate to the main dwelling. Secondary suites may be called basements apartments, accessory dwelling units, or garden suites in different city materials.

Permits and approvals required

Most secondary-suite projects require one or more of the following approvals: zoning confirmation or amendment, a building permit under the Ontario Building Code, and compliance with property standards and fire code. Start by confirming zoning allowances and standards on the City of London planning pages City of London - Zoning & land use^[1], then prepare a building-permit application with construction drawings and services info Building permits^[2].

Penalties & Enforcement

Enforcement is managed by the City of London enforcement teams, including By-law Enforcement and Building Services. Specific monetary fines for unpermitted secondary suites are not provided on the cited enforcement pages; where amounts or schedules are required they are referenced on the applicable bylaw or order page and may be issued under the Municipal Act or local bylaws By-law Enforcement^[3]. If fine amounts, daily continuing offence charges, or set penalties are not listed on the enforcement page, they are described in the specific bylaw or provincial instrument that the order relies on and thus may vary.

• Fines and monetary penalties: not specified on the cited page; see the enforcing bylaw for exact amounts.
• Escalation: first offence, repeat offences and continuing offences handled per the enforcing bylaw or order; specific ranges not specified on the cited page.
• Non-monetary orders: stop-work orders, compliance orders, orders to remove or alter the unit, or court prosecution are available enforcement tools.
• Enforcer and complaints: By-law Enforcement and Building Services accept complaints and schedule inspections via the city contact pages.
• Appeals and reviews: appeals of orders or decisions follow administrative or court routes; time limits and specific appeal processes are set out in the relevant bylaw or provincial statute and are not specified on the cited page.

Applications & Forms

The following applications commonly apply to secondary suites; check the linked city pages for current forms and submission methods.

• Building Permit Application: required for structural, fire-separation, plumbing, heating and egress changes; fees and submission method available on the building permits page Building permits^[2].
• Zoning confirmation or minor variance: if a secondary suite is not permitted in the zone, an application or variance may be required; check zoning rules Zoning & land use^[1].
• Fees: specific fee amounts are published with each application on the city site; where not published on the cited page, fees are not specified on the cited page.

Inspections, safety and occupancy

Inspections certify that the suite meets the Ontario Building Code, fire separation and life-safety requirements. Typical inspections include framing, plumbing, HVAC and final occupancy. Occupancy cannot legally occur until final approvals are issued.

• Required inspections: framing, insulation, plumbing, HVAC and final inspection as listed on the building permit.
• Safety standards: egress windows, smoke and carbon monoxide alarms, and proper fire separations are commonly enforced.

Common violations

• Operating a rental unit without a building permit or required approvals.
• Inadequate fire separations, missing egress or alarm systems.
• Unauthorized changes to plumbing, electrical or structural systems.

Action steps

• Step 1: Confirm zoning for your property on the City of London zoning pages Zoning & land use^[1].
• Step 2: Prepare drawings and submit a building permit application via the city building-permit portal Building permits^[2].
• Step 3: If you receive a complaint or order, contact By-law Enforcement to resolve or appeal By-law Enforcement^[3].

FAQ

Do I need a permit to create a secondary suite?

Yes. Most conversions require a building permit and may need zoning confirmation or a variance depending on your property.

How long does approval take?

Timelines depend on application completeness, required variances and inspection scheduling; specific processing times are published by the city or noted on the application pages.

What happens if I rent without permits?

You may face stop-work orders, fines, and orders to remove the unit; enforcement specifics are provided in the relevant bylaw or order.

How-To

1. Check your property zoning and permitted uses on the City of London zoning pages.
2. Engage a designer or architect to prepare code-compliant drawings showing egress, fire separation and services.
3. Submit a building permit application with drawings and pay the fee via the city’s building-permit portal.
4. Schedule and pass required inspections during construction stages.
5. Obtain final inspection and occupancy approval before renting the suite.

Key Takeaways

• Plan early: zoning and building approvals must be confirmed before construction.
• Inspections are mandatory: do not occupy until final approval is issued.

Help and Support / Resources

• City of London - Planning & Development Services
• City of London - Building permits
• City of London - By-law Enforcement

1. [1] City of London - Zoning & land use
2. [2] City of London - Building permits
3. [3] City of London - By-law Enforcement