How much does it cost to wire a basement apartment to meet Ontario electrical code in Toronto?

Wiring a basement apartment to meet Ontario electrical code in the GTA typically costs between $5,000 and $12,000 for the electrical scope alone, depending on whether you need a separate sub-panel, how many rooms you are finishing, and the current state of your home's electrical infrastructure. This is one of the more involved residential electrical projects, and cutting corners on code compliance creates serious legal and safety problems.

The single biggest variable is whether your existing panel can support the additional load. A basement apartment adds a kitchen with dedicated appliance circuits, a bathroom with GFCI protection, multiple bedroom and living area circuits with AFCI protection, and potentially its own heating circuits. If your main panel is 100A — common in post-war GTA homes across Scarborough, North York, and Etobicoke — you will almost certainly need a panel upgrade to 200A ($2,000–$4,000) before the apartment wiring even begins. Many electricians recommend installing a dedicated sub-panel for the basement apartment, typically 60A to 100A, at a cost of $1,200 to $2,500. A separate sub-panel makes metering, maintenance, and future troubleshooting much simpler.

The circuit requirements for a code-compliant basement apartment are substantial. You will need dedicated 20A circuits for the kitchen counter outlets (minimum two), a dedicated circuit for the refrigerator, a dedicated circuit for the range or cooktop (40–50A if electric), a dedicated circuit for the dishwasher if included, GFCI-protected circuits for the bathroom and kitchen, AFCI-protected circuits for all bedrooms, general lighting and outlet circuits for living areas, and circuits for the laundry area if the apartment includes washer and dryer hookups. Each new circuit runs $300 to $800 depending on the routing distance from the panel. A typical one-bedroom basement apartment requires 10 to 15 circuits.

Lighting installation adds $1,500 to $3,500 to the electrical budget. Basements benefit from generous potlight layouts to compensate for limited natural light — most basement apartments use eight to fifteen recessed LED lights across the living spaces, at $150 to $300 per light installed. The bathroom, kitchen, and any closets need their own fixture circuits as well.

Ontario code requires hardwired, interconnected smoke alarms on every level of the home and outside sleeping areas, plus carbon monoxide detectors near sleeping areas. The basement apartment needs its own smoke and CO detection that interconnects with the rest of the home's alarm system. This adds $300 to $600 for the devices and wiring.

The City of Toronto requires a building permit for basement apartment conversions, and the ESA electrical permit is a separate requirement on top of that. The ESA permit for a project of this scope typically runs $200 to $400. The ESA inspection is thorough for apartment conversions — the inspector will check every circuit, every connection, GFCI and AFCI protection, smoke and CO alarm interconnection, and panel labelling. This is not a project where unpermitted work can slide by unnoticed, especially if you intend to register the apartment with the city or rent it legally.

GTA electricians experienced with basement apartment wiring typically quote this as a fixed-price project rather than hourly. Get at least three quotes and ensure each electrician includes the ESA permit, all required circuits, and the inspection in their price. Toronto Electrical Repair can connect you with licensed electricians through the Toronto Construction Network who regularly handle basement apartment electrical work.