When to call an electrician vs handle it yourself — the GTA rules
YouTube has made every homeowner think they can change a light switch. Sometimes you can. Sometimes you really, really shouldn't. Here's what Ontario actually allows for DIY electrical work, what requires a licensed 309A electrician, and what happens if you get it wrong.
The Ontario rules — short version
Ontario's electrical work is regulated by the Electrical Safety Authority (ESA). The rules are surprisingly homeowner-friendly compared to many other provinces, but they have hard limits.
What you can legally DIY
- Replace existing receptacles (outlets) with the same type
- Replace existing light fixtures, switches, dimmers
- Replace existing thermostats
- Install plug-in fixtures (e.g., plug-in chandeliers)
- Replace appliance cords on small appliances
For these, you don't need an ESA permit or a licensed electrician — but you DO need to know what you're doing and your work has to meet the Ontario Electrical Safety Code. If you sell your house and ESA later finds your work was done improperly, that's on you.
What requires a licensed 309A electrician + ESA permit
- Adding a new circuit (new wiring back to the panel)
- Upgrading your electrical panel or service (e.g., 100A to 200A)
- Installing an EV charger (these are dedicated circuits)
- Anything involving the main service connection from Hydro
- Rewiring rooms or sections of your home
- Any work in a new construction or addition
- Knob-and-tube replacement
- Installing pot lights (because they're hardwired) — even though the install itself is simple
These all require an ESA permit (filed by the contractor) and inspection. The permit + inspection adds $100-$250 to the job but protects your insurance.
What happens if you DIY something you shouldn't
Three things, ranked by how badly they ruin your life:
1. Your home insurance can deny claims
If a fire is traced back to non-permitted electrical work, your insurer can deny the entire claim — not just the electrical-related portion. A $5 light fixture install that started an attic fire can become a $400,000 problem.
2. You can't sell the house
Most GTA home buyers ask for an electrical inspection during the closing. Non-permitted work shows up in those inspections. You'll either fix it (often at 2-3x the cost of doing it right the first time) or eat a price reduction.
3. You can hurt someone
This one matters most. Bad wiring in your kitchen can shock the next person who plugs in a toaster. Bad wiring in your bedroom can kill someone in a fire while they sleep. Don't take the risk to save $200.
How to find a real 309A electrician in the GTA
Verify their licence
A 309A Electrician — Construction & Maintenance Certificate of Qualification is required by Ontario law. Check their number on the Skilled Trades Ontario directory. Anyone without it is unlicensed, period.
Check ESA contractor status
For larger jobs, your electrician's company should be a Licensed Electrical Contractor (LEC) with ESA. Verify at esasafe.com.
Get the permit number in writing
For permitted work, the contractor files the ESA permit. Before they leave, they should give you a copy of the permit number or the ESA Notification of Connection number. If they "forget" — that means they didn't file one. Don't pay until you have it.
Typical costs in the GTA
- Service call / diagnostic: $120–$220
- Single new receptacle on existing circuit: $180–$320
- EV charger install (Level 2, 40A circuit): $800–$1,800 (often includes ESA permit)
- 200A panel upgrade: $2,500–$4,500
- Whole-home knob-and-tube replacement: $8,000–$25,000+
Qoro is bringing electrical to the GTA
Electrical is one of the next verticals onboarding to Qoro. We're matching customers with identity-checked, 309A-licensed electricians across the Greater Toronto Area in the coming weeks.
If you're a licensed electrician reading this and want to be part of the founding cohort: apply here — your first 30 days on Qoro are commission-free.