What is the cost to bring old electrical work up to current Ontario code during a renovation?

The cost to bring old electrical work up to current Ontario Electrical Safety Code standards during a renovation ranges from $2,000 for minor upgrades to $15,000 or more for extensive remediation in older GTA homes. The actual cost depends heavily on the age of your home, the scope of the renovation, what existing wiring is in place, and how much of the electrical system the renovation exposes.

The Ontario Electrical Safety Code has a practical provision that affects every renovation project: the "once you touch it, you upgrade it" principle. If you open walls during a renovation and expose existing wiring, the ESA inspector will require that any visible electrical work meet current code standards. This means a bathroom renovation that opens walls may trigger a requirement to add GFCI protection, upgrade wiring from 14-gauge to 12-gauge on 20-amp circuits, install tamper-resistant outlets, and add AFCI protection on applicable circuits. You are not required to rewire your entire house just because you renovated one room — but everything within the scope of the renovation must comply with the current code edition.

For older Toronto homes, here is what the most common code upgrades cost during a renovation. GFCI protection where the code now requires it — bathrooms, kitchens, garages, outdoor outlets, unfinished basements — runs $200 to $350 per outlet if new wiring is needed, or $35 to $55 per circuit if you are adding GFCI breakers at the panel. AFCI protection on bedroom circuits costs $30 to $50 per AFCI breaker, plus any wiring modifications needed to isolate those circuits — a common issue in older homes where bedroom and hallway outlets share circuits with other rooms. Tamper-resistant outlets are inexpensive ($3 to $8 per device) but must be installed on all new or replaced receptacles.

The bigger costs come when the renovation reveals fundamental deficiencies. If your 1950s Scarborough bungalow still has a 60-amp fuse box and you are finishing the basement, the ESA inspector will likely require a panel upgrade to support the additional circuits — that is $2,500 to $4,500 for a 200-amp panel upgrade. If the renovation exposes aluminum branch circuit wiring (common in 1965-1975 GTA homes), remediation using approved AlumiConn connectors runs $3,000 to $8,000, or $5,000 to $12,000 for the more permanent COPALUM crimp method. If knob-and-tube wiring is discovered in the walls you have opened, it must be replaced in that area — typically $150 to $300 per circuit run.

The ESA permit for renovation electrical work runs $150 to $400 depending on the number of devices and circuits involved, and your electrician includes this in their quote. The inspection process during a renovation has a specific sequence: your electrician completes the rough-in (running wires, installing boxes), the ESA inspects the rough-in before walls are closed, then walls are finished, and a final inspection confirms everything is complete. Missing the rough-in inspection means potentially opening finished walls later — a costly mistake.

The smartest approach for any GTA renovation is to have your electrician assess the full electrical scope before you start. They can identify what code upgrades the project will trigger, include those costs in the initial quote, and coordinate the ESA inspection schedule with your contractor's timeline. Toronto Electrical Repair can connect you with licensed electricians experienced in renovation electrical work through the Toronto Construction Network directory.