Converting a Toronto basement into a legal rental apartment in 2026 takes 6–9 months from first call to first tenant, costs $75,000–180,000 all-in, and generates $1,800–2,600/month in rental income. Here’s exactly what the process looks like.
What “legal” means for a basement apartment in Toronto
Under Toronto Zoning Bylaw 569-2013, a legal second suite must have: its own exterior entrance (not through the main unit), minimum 1.95m ceiling height in habitable areas, fire separation from the upper unit (Type X drywall, fire-rated doors), egress windows in every bedroom, and registration with the City of Toronto.
An unregistered “income suite” that meets all these requirements is still technically legal to occupy but cannot be listed as a legal second suite — which affects your mortgage qualification (lenders discount unregistered rental income) and resale disclosure obligations.
Registration process for a second suite in Toronto
- Get a building permit. Submit drawings (BCIN designer or architect) showing the suite layout, fire separation, egress, and entrance. Permit issuance: 8–14 weeks in 2026.
- Build to OBC standards. Type X drywall between units, fire-rated door at top of staircase (if internal access exists), CO + smoke detectors hardwired and interconnected, separate laundry.
- Pass all inspections. Frame, insulation, rough-in electrical (ESA), rough-in plumbing, and final occupancy.
- Register with City of Toronto. File for second suite registration at the Building Division. Inspection confirms compliance. Certificate issued.
Ceiling height — the most common deal-breaker
Toronto OBC requires 1.95m (6’5″) minimum in living areas, 1.9m under beams. Most Toronto homes built before 1970 have 6’0″–6’2″ basements. Below threshold, your options are: bench footing (fastest, cheapest, loses 2–3 feet of floor space perimeter, $15–35K) or traditional underpinning (digs below existing footings, maintains full floor width, $300–600/linear foot, typically $45–80K for a typical semi).
Separate entrance options and costs
There are three standard approaches for a separate entrance in Toronto:
- Side-door with stairwell ($20–35K): New exterior opening cut through foundation wall, retaining wall if grade difference is significant, code-compliant staircase with railing.
- Walkout from backyard ($15–25K): Backyard grade allows a door at basement level. No major excavation needed. Most affordable if topography allows.
- English-style front or side entrance ($25–45K): Covered stairwell descending from sidewalk level to basement door. Common in older Toronto neighbourhoods (Leslieville, Parkdale, Riverdale).
What does a basement apartment conversion cost in Toronto in 2026?
| Scenario | Estimated cost |
|---|---|
| Standard ceiling height, side-door entrance, 1 bedroom + 1 bath | $75,000–110,000 |
| Standard ceiling height, walkout, 2 bedroom + 1 bath | $95,000–130,000 |
| Low ceiling (underpinning needed), 1 bedroom + 1 bath | $130,000–165,000 |
| Full build-out: 2 bedroom, 2 bath, full kitchen, separate entrance | $150,000–185,000 |
Rental income potential in Toronto 2026
Based on CMHC and Toronto Regional Real Estate Board data for 2026:
- 1-bedroom basement suite: $1,700–2,100/month
- 2-bedroom basement suite: $2,100–2,600/month
- Scarborough / North York average: $1,800–2,200/month
- East End / West End Toronto: $2,000–2,600/month
At $2,000/month with a $130,000 all-in conversion cost, payback period is approximately 5.5 years. Home equity increase on appraisal: typically $80,000–120,000 immediately post-registration.
Start with a free walkthrough
CNB has completed 137 basement projects across the GTA, including 43 legal second suite conversions. We handle permit, engineering, build, and registration coordination. Call (437) 217-5519 or request a free walkthrough — we come to you, assess the space, and give you a written quote within 24 hours.