What are the bylaws for a secondary suite in Ottawa?

Secondary suites in Ottawa must comply with both zoning bylaws and Ontario Building Code requirements, with specific rules varying by neighborhood and property type.

The City of Ottawa allows secondary suites (also called accessory dwelling units) in most residential zones, but there are strict requirements you must meet before converting space or advertising a rental unit.

Zoning Requirements in Ottawa

Your property must be in a zone that permits secondary suites. Most R1, R2, R3, and R4 residential zones allow them, but some older neighborhoods have restrictions. You can check your property's zoning and secondary suite eligibility on ottawa.ca or call Planning Services at 613-580-2424.

Key zoning rules include:

• Only one secondary suite per property


• Maximum 40% of the total floor area of the dwelling


• Separate entrance required (can be internal or external)


• Minimum one parking space must be maintained for the main dwelling


• Cannot be in a basement that's more than 50% below grade in some zones

Building Code and Permit Requirements

You MUST get a building permit before creating a secondary suite in Ottawa. This typically costs $500-$2,000 depending on the scope of work and takes 6-12 weeks to process. The permit ensures your suite meets Ontario Building Code safety requirements.

Building Code requirements include:

• Minimum 7-foot ceiling height (6'5" acceptable in some basement areas)


• Separate heating system or adequate heating for the space


• Proper egress windows in bedrooms (minimum opening size requirements)


• Smoke and carbon monoxide detectors on every level


• Fire separation between units (typically 1-hour fire rating)


• Sound insulation between units

Electrical and Mechanical Systems

Your secondary suite needs separate electrical and water meters in most cases. All electrical work requires an ESA (Electrical Safety Authority) permit - verify your electrician's license at esasafe.com/contractor-locator. If you're adding gas appliances, you'll need TSSA-certified technicians and additional permits.

What to Watch For

Many Ottawa homeowners unknowingly operate illegal secondary suites. Red flags include contractors who say "you don't need permits" or suggest hiding the work from the city. Illegal suites can result in fines, forced closure, insurance issues, and problems selling your home.

Always verify that contractors pulling permits are properly licensed. Check ESA licenses for electrical work, TSSA certification for gas work, and ensure general contractors have WSIB clearance and liability insurance.

Official Resources and Next Steps

Start by calling City of Ottawa Building Code Services at 613-580-2424 to discuss your specific property. Visit ottawa.ca/building to download secondary suite application forms and review current fee schedules. The city's planning department can confirm zoning compliance before you invest in design and permits.

For complex conversions, especially in older Ottawa homes in areas like the Glebe, Westboro, or Hintonburg, consider hiring a designer familiar with Ottawa's secondary suite requirements to ensure your plans meet all bylaws before construction begins.