What electrical work requires a licensed electrician versus what I can do myself in Ontario?

In Ontario, virtually all electrical work in a bathroom requires a licensed electrician, an electrical permit, and an ESA (Electrical Safety Authority) inspection. The line between what a homeowner can legally do and what requires a professional is much stricter than most GTA homeowners realize, and bathrooms are the most regulated rooms in the house because of the combination of water and electricity.

What Homeowners CAN Do

The list of permissible DIY electrical tasks in a bathroom is very short. You can replace a light switch with a new switch of the same type (single-pole for single-pole, dimmer for dimmer) without a permit, as long as you turn off the breaker and understand basic wiring. You can replace an existing light fixture with a new fixture — swapping out a vanity light bar or ceiling fixture — provided the new fixture connects to the same junction box and wiring without any modifications. You can also replace a GFCI outlet with a new GFCI outlet in the same location, using the existing wiring and box.

Even these simple replacements come with an important caution: if the existing wiring is outdated (knob-and-tube in pre-war Toronto homes, or aluminum wiring common in 1960s–1970s GTA homes), the replacement itself may reveal conditions that require professional assessment. If you open a junction box and find aluminum wiring, knob-and-tube, or wiring that looks damaged or improperly connected, stop and call a licensed electrician.

What REQUIRES a Licensed Electrician

Adding a new electrical circuit of any kind — for a heated floor, an exhaust fan with a heater, a towel warmer, a bidet seat, or additional pot lights — requires a licensed electrician, a permit from the local municipality, and an ESA inspection. Running new wiring through walls, ceilings, or floors requires a professional. Adding a new outlet or relocating an existing outlet requires a permit and inspection. Installing a new exhaust fan where none existed, or upgrading from a basic fan to a fan-heater-light combo unit, requires professional installation.

In a typical GTA bathroom renovation, the electrical scope includes new GFCI-protected outlets (often adding a second outlet or relocating outlets for a new vanity layout), exhaust fan installation or upgrade, vanity lighting (new fixture, possibly relocated or additional fixtures), pot light installation, and potentially heated floor wiring and a bidet seat outlet. All of this work requires permits and ESA inspection before being concealed behind drywall or tile.

Why This Matters for Your Renovation

The practical impact for GTA homeowners is straightforward: budget $1,500–$4,000 for electrical work in a standard bathroom renovation, depending on the scope. A basic electrical package (new exhaust fan, new vanity light, two GFCI outlets, pot lights) runs approximately $1,500–$2,500 including permits and ESA inspection. Adding heated floor wiring adds $800–$1,500 for the electrical installation alone (on top of the heating mat cost). A bidet seat outlet adds $200–$400.

Always confirm that your electrician is licensed with the ESA and carries WSIB (Workplace Safety and Insurance Board) coverage. Request their ESA/ECRA licence number and verify it. In the GTA, licensed electrician rates run $75–$120 per hour, though most bathroom electrical work is quoted as a flat rate for the complete scope. Get the electrical quote early in your renovation planning — it affects the project timeline because wiring must be roughed in before drywall and tile, and the ESA inspection must happen before walls are closed up.