What are the bylaws for a secondary suite in Ottawa?

In Ottawa, secondary suites (also called secondary dwelling units) are permitted in most residential zones, but must comply with specific zoning bylaws, building code requirements, and obtain proper permits through the City.

Ottawa Zoning Requirements for Secondary Suites

Secondary suites are allowed in single-detached, semi-detached, and townhouse dwellings in most residential zones across Ottawa, including neighborhoods like Kanata, Orleans, Barrhaven, Nepean, and Gloucester. The key zoning requirements include:

The secondary suite cannot exceed 40% of the total floor area of the dwelling, and parking requirements must be met - typically one additional parking space for the secondary unit. The property must maintain its single-family appearance from the street, meaning no external modifications that would obviously indicate a duplex.

Building Code and Safety Standards

All secondary suites in Ottawa must meet Ontario Building Code requirements for separate dwelling units. This includes separate electrical panels and meters, independent heating systems, and proper fire separation between units. Each unit needs its own bathroom and kitchen facilities, and there must be separate entrances - though they can be internal entrances within the same building.

Fire safety is critical: smoke alarms must be interconnected throughout both units, carbon monoxide detectors are required where applicable, and proper fire-rated separation between floors/units must be installed. Windows in bedrooms must meet egress requirements for emergency exit.

City of Ottawa Permit Process

You'll need both a building permit and zoning compliance confirmation from the City of Ottawa Building Code Services (613-580-2424). The permit process typically takes 6-12 weeks and costs $500-2000+ depending on the scope of work required.

Before starting, request a zoning verification from the City to confirm your property is eligible. Some areas have specific restrictions or may require minor variances. The application requires detailed drawings showing the proposed layout, fire separation details, and how parking requirements will be met.

ESA and TSSA Requirements

Since secondary suites require separate electrical systems, you'll need an ESA (Electrical Safety Authority) permit for all electrical work. Only Licensed Electrical Contractors can pull these permits - verify any electrician at esasafe.com/contractor-locator.

If adding or modifying gas lines for separate heating or appliances, TSSA (Technical Standards and Safety Authority) permits and certified technicians are required. Check contractor certification at tssa.org.

What to Watch For When Hiring Contractors

Many contractors claim they can create "legal" secondary suites without permits - this is a major red flag. Unpermitted suites can result in orders to remove the suite, insurance issues, and problems selling your home. Always verify contractors have proper licensing (WSIB clearance, appropriate trade licenses) and insist on proper permits.

Get detailed quotes that specifically address Building Code compliance, fire separation requirements, and permit costs. Legitimate contractors will include permit fees and inspection schedules in their estimates.

Official Resources

Contact City of Ottawa Building Code Services at 613-580-2424 or visit ottawa.ca/building for current application forms and requirements. The City's Secondary Dwelling Unit guide provides detailed requirements specific to Ottawa's bylaws.

For contractor verification, use ESA's contractor locator and TSSA's technician search. Always verify WSIB clearance certificates before hiring anyone for this type of major renovation project.