A separate entrance basement conversion in Toronto runs $18,000–$45,000 depending on excavation scope. CNB has completed 43 separate entrance projects across the GTA since 2015 — here’s what you actually need to know before calling anyone.
What counts as a separate entrance?
Toronto Building Code defines a separate entrance as an independent access point to a basement unit that does not pass through the main dwelling. Three configurations qualify:
- Side-door entrance — door cut through the foundation wall, typically 36″ wide, with exterior stairs. Most common in semi-detached and detached homes. Cost: $18,000–$28,000.
- Walkout basement — rear yard grade slopes away from the house, allowing a door at grade level with no stairs. Requires excavation if grade is level. Cost: $12,000–$22,000.
- Walk-up (stairwell) — concrete stairwell dug into the front or side yard with a door at the bottom. Common in older Toronto stock. Cost: $22,000–$45,000 due to excavation volume.
Toronto permit requirements for a separate entrance
Every separate entrance in Toronto requires a building permit. No exceptions. Here’s the full list of what the City of Toronto Building Division requires:
| Requirement | Who provides it | Typical cost |
|---|---|---|
| Building permit application | Contractor or designer | $1,200–$2,800 |
| Architectural drawings (BCIN-stamped) | Designer or architect | $1,500–$3,000 |
| Structural engineer letter (if lintel required) | P.Eng | $600–$1,200 |
| Zoning confirmation (legal suite) | Zoning desk, no cost | $0 |
| Fire separation inspection | City inspector | Included in permit |
CNB handles permit applications on every project. We have a BCIN-registered designer on staff and a structural engineer we’ve worked with for 9 years.
Real project breakdown: side-door entrance, Etobicoke 2025
Client: semi-detached on Islington Ave, 1948 build, poured concrete foundation. Goal: legal second suite rental.
- Core drill + door frame rough-in: $3,400
- Foundation waterproofing (exterior membrane + weeping tile, 8 linear ft): $4,200
- Structural lintel (engineered beam over opening): $1,800
- Exterior stairs (concrete, 4 risers with landing): $6,500
- Wrought iron railings (code-required): $1,400
- Interior door frame + pre-hung steel door: $1,100
- Permit + BCIN drawings: $3,200
- Total: $21,600
Monthly rent for the unit: $1,850. Payback period: under 12 months.
What can go wrong (and how we prevent it)
Three failure modes we see on competitor jobs:
- No waterproofing on the cut. Cutting a foundation wall without exterior membrane and weeping tile creates a guaranteed leak point within 2–3 winters. We always waterproof the full opening perimeter from outside.
- Undersized lintel. The beam over the door opening must be engineered for the load above. We get a P.Eng letter on every project — this is also a permit requirement.
- Non-compliant egress window in unit. If the basement unit has bedrooms, every bedroom needs a code-compliant egress window (minimum clear opening 3.8 sq ft, sill max 1.0m from floor). Separate entrance doesn’t replace egress window requirements.
How long does a separate entrance take?
Typical timeline from signed contract to City inspection pass:
- Permit processing: 3–6 weeks (Toronto Building Division current queue)
- Active construction: 5–8 business days
- Inspection booking: 3–5 business days after framing
- Total project: 6–10 weeks start to key handover
Frequently asked questions
Can I add a separate entrance without making the basement a legal suite?
Yes — you can permit a separate entrance as an “accessory use” without registering the unit as a second suite. But if you rent it, the City considers it a second unit and you need the full suite compliance anyway.
Does my detached garage count toward the separate entrance setback?
Setback rules apply to the main structure. A separate entrance stairwell is considered part of the house and uses house setbacks, not accessory structure setbacks. Check your lot’s specific zoning — some lots near ravines have tighter restrictions.
Can CNB do the whole basement — separate entrance plus full finishing?
Yes, and it’s cheaper this way. Combining the entrance with basement finishing lets us rough-in plumbing, electrical, and framing in a single mobilization. We quote both together and the savings are usually $4,000–$8,000 vs. doing them separately.
Call CNB at (437) 217-5519 or fill out our quote form — we’ll book a free walkthrough within 48 hours and give you a written number, not an estimate range.