To qualify to build a legal basement apartment in Ontario, you must meet the following key requirements:
Ceiling Height: Minimum 1.95 m (6 ft 5 in) over the main living areas.
Egress: A second, separate means of escape (window or door) that meets size and accessibility requirements.
Fire Separation: 30-minute fire-rated separation between units; interconnected smoke alarms in both units.
Ventilation: Independent or code-compliant shared HVAC, with proper exhaust for kitchens and bathrooms.
Windows: Minimum window area for natural light (5% of floor area for living/dining rooms, 2.5% for bedrooms).
Soundproofing: Required sound transmission class (STC) rating between units (usually STC 50 or more).
Electrical Safety Authority (ESA)

Must obtain an electrical permit before beginning any electrical work.
Inspection: All electrical work must be inspected and approved by the ESA.
Separate Panels (Optional): If creating separate metering or panels, additional compliance is needed.

The cost of construction varies based on the grading and layout of your lot and space, contact Ali today for your free consultation!

Typically, construction takes 6 to 12 weeks, depending on the scope of work, inspections, permit approvals, and contractor availability. Delays may occur if structural changes or major electrical/plumbing upgrades are needed.

Yes! Ali can connect you with trusted trades professionals and architects who specialize in legal basement apartments. They can help with everything from design plans to securing the necessary permits to meet Ontario Building Code and ESA requirements.