Creating a Legal Secondary Suite in Toronto

Toronto's secondary suite requirements include:

• Zoning: Secondary suites are permitted as-of-right in most residential zones (R, RD, RS, RT zones). Some exceptions may apply. PermitPaths checks your specific zoning automatically.
• Fire Separation: A fire separation with a minimum 45-minute fire resistance rating is required between the secondary suite and the rest of the house. This includes fire-rated drywall on walls and ceilings, fire-stopped penetrations, and self-closing doors.
• Separate Entrance: The suite must have its own entrance, either directly from outside or through a shared vestibule with a fire separation from the main unit.
• Egress Windows: Every bedroom in the suite must have an egress window meeting minimum size requirements (0.35 m² opening, no dimension less than 380 mm).
• Ceiling Height: Minimum 1.95 m (6'-5") clear height for habitable rooms.
• Smoke and CO Alarms: Interconnected smoke alarms on each storey and CO alarms near sleeping areas (required for both units).
• Parking: Toronto's zoning bylaw typically does not require additional parking for a secondary suite, but check your specific zone.
• Kitchen and Bathroom: The suite must have its own kitchen and bathroom facilities.

1. Check zoning eligibility — Verify your property allows a secondary suite. Use PermitPaths for an instant zoning check or contact Toronto Building.
2. Hire professionals — You'll likely need an architect or designer for drawings, plus licensed plumbing and electrical contractors.
3. Prepare detailed plans — Floor plans showing both units, fire separation details, egress windows, plumbing layout, electrical layout, and HVAC modifications.
4. Submit permit application — Apply to Toronto Building with all required drawings and documents.
5. Pay fees — Secondary suite permits can cost $206–$2,000+ depending on the scope and square footage.
6. Wait for review — Expect 15–20 business days for review. The plans examiner may request revisions.
7. Construction — Build according to approved plans. Do not deviate from the approved drawings without consulting Toronto Building.
8. Schedule inspections — Multiple inspections are required: framing, plumbing rough-in, electrical rough-in, insulation/fire separation, and final.
9. Final inspection and occupancy — Once all inspections pass, you receive occupancy clearance.
10. Register your suite — Register your secondary suite with the City of Toronto's secondary suite registration program.

• Building permit fee: $206–$2,000+ (based on floor area and scope)
• Architectural/design drawings: $1,500–$5,000
• Structural engineer (if underpinning or structural changes): $500–$2,000
• Plumbing (new bathroom and kitchen): $5,000–$15,000
• Electrical (new panel, circuits, lighting): $3,000–$8,000
• Fire separation (fire-rated drywall, doors): $2,000–$5,000
• Egress window installation: $2,000–$5,000 per window
• HVAC modifications: $2,000–$8,000
• General construction (framing, insulation, drywall, finishes): $15,000–$40,000

Total cost for a secondary suite in Toronto typically ranges from $50,000 to $100,000+. However, rental income of $1,500–$2,500/month can provide a return on investment within a few years.

• Not checking zoning first: While most residential zones in Toronto allow secondary suites, some have restrictions. Check before investing in plans and design.
• Inadequate fire separation: The fire separation between units is the most scrutinized element during inspections. Every penetration (pipes, wires, ducts) must be properly fire-stopped. Missing even one can fail the inspection.
• Skipping the registration: After your suite passes final inspection, you must register it with the City. An unregistered suite is technically illegal and may cause issues with insurance and property taxes.
• Insufficient ceiling height: If your basement ceiling is below 1.95 m, you'll need underpinning — a significant additional cost ($20,000–$50,000+) that changes the entire project scope.
• Ignoring the electrical panel: A secondary suite typically needs a separate electrical panel or sub-panel. Plan for this early, as it affects layout and costs.
• Not planning for shared systems: Think through how heating, cooling, water heating, and laundry will work for both units. Shared systems need clear metering or allocation agreements.

• Completed application form with secondary suite designation
• Floor plans — Both existing and proposed, showing both units, room dimensions, windows, doors, kitchen and bathroom layouts
• Fire separation details — Wall and ceiling assemblies, fire-stop locations, self-closing door specifications
• Site plan — Showing entrances, parking (if required), and window wells
• HVAC layout — Showing heating/cooling for both units
• Plumbing layout — All fixtures, drainage, water supply
• Electrical plan — Panel locations, circuits, interconnected smoke/CO alarm layout
• Structural drawings — If any structural modifications (underpinning, beam changes)

• Check the Ontario Secondary Suite Guide: The provincial government publishes a guide for creating secondary suites that explains the building code requirements in plain language.
• Plan the entrance carefully: A well-designed separate entrance improves tenant privacy and can increase rental value. Consider both interior and exterior entrance options.
• Think about sound separation: While not a code requirement beyond fire separation, good sound insulation between units makes for happier tenants and fewer complaints. Consider resilient channels and acoustic insulation.
• Get multiple contractor quotes: Secondary suite projects are complex. Get at least three detailed quotes and check references.
• Budget for the unexpected: Older Toronto homes often reveal surprises during construction. Budget a 15–20% contingency.
• Use PermitPaths: Our assessment tool checks your address for zoning eligibility, heritage restrictions, and other factors that affect secondary suite feasibility — before you spend money on design.