EZSMART Corporation, ESA/ECRA #7012690 , North York , Ontario
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Most Ontario homeowners never think about their electrical panel until a breaker keeps tripping, an insurance broker asks about it, or they price an EV charger and hear the words “you will need a panel upgrade.” A panel that was more than enough in 1985 can be undersized for a 2026 household with a heat pump, an EV, and induction cooking. This guide walks GTA homeowners through how to know if you need to upgrade your electrical panel, what the Ontario Electrical Safety Code and the ESA look at, and how to price the work.
Any one of these is a reason to book a licensed electrician for a panel assessment. Two or more together usually mean the panel is already at the end of its useful life.
Direct answer: your service size is stamped on the main breaker at the top of the panel. If it says 60 or 100, that is your total capacity. Homes built after about 1990 in most GTA neighbourhoods have 100-amp service. Homes built after about 2010, or that have already been upgraded, usually have 200-amp service.
Our post on the difference between a 100 amp and 200 amp panel covers the load math in detail. In brief: a 100-amp service can handle a typical Ontario detached home with gas heat, gas water, and standard appliances. Add a heat pump, an EV charger, or electrify hot water — and you are looking at 200-amp territory.
Direct answer: any of the following means killing power at the main and calling a licensed electrician the same day — audible buzzing from the panel, visible arcing at breakers, panel body warm to the touch, burn marks around a breaker, or a smell of hot plastic or ozone near the panel.
The Electrical Safety Authority tracks panel-related residential incidents in its annual Ontario Electrical Safety Report, and hot or arcing panels are among the highest-severity findings. Do not open the panel yourself — the busbars behind the main breaker remain live even when the main is off unless the utility pulls the meter first.
Direct answer: three panel brands installed in Ontario homes from the 1960s to the early 1990s are now known to fail dangerously — Federal Pacific Electric (FPE) Stab-Lok, Zinsco, and Sylvania. Their breakers often do not trip under overload conditions, meaning the panel becomes a fire risk rather than a safety device.
Many Ontario home insurance carriers will not renew coverage on a home with a Stab-Lok or Zinsco panel until it is replaced. If you own a home built between 1965 and 1990 in Etobicoke, North York, Scarborough, or the older Vaughan/Richmond Hill neighbourhoods, look at the brand name on your panel today. If it is one of these three, book a replacement quote before your next renewal cycle.
Direct answer: a Level 2 EV charger typically pulls 32-48 amps continuous. A cold-climate heat pump can draw 20-40 amps depending on capacity. Add either to an already-loaded 100-amp panel and you are almost certainly beyond the OESC 80% continuous-load derating rule.
A licensed electrician will do a load calculation per Section 8 of the Ontario Electrical Safety Code before quoting the EV charger install — this is not optional. If the calc shows you are over the panel’s capacity, the options are an upgrade to 200-amp service, a load management device that cycles the charger, or a lower-amperage charger. Our post on whether a 100-amp panel can support an EV charger covers the math with real numbers.
Direct answer: a straight 100-to-200-amp upgrade in the GTA typically runs $3,500 to $5,500 fully installed with permits and utility coordination. If your meter, service head, or drop cable also need replacement the number climbs to $5,500-8,500. Aluminum service entrance conductors add a few hundred more.
The scope includes the ESA permit, coordination with your local distribution company (Toronto Hydro, Alectra, Hydro One, or your municipal LDC) to disconnect and reconnect the service, a new main breaker and panel, new grounding, and inspection. It is a one-day job on most homes when the service drop cable does not need replacement. For a per-neighbourhood price, our team publishes local pages such as panel upgrade in Thornhill and panel upgrade in Markham.
In our experience quoting panel upgrades across the GTA, the single most valuable pre-upgrade step is a written load calculation. It costs us an hour of work, and it settles two questions at once — whether you actually need 200 amps, and whether the service drop from the utility can carry it. Homeowners who skip the load calc and just size up to 200 amps sometimes discover after the panel is installed that Toronto Hydro or Alectra needs to upgrade the drop cable first, which pushes the project into a multi-week timeline. Half an hour of math up front saves the delay every time.
Want an ESA-certified electrician to run a load calculation and quote a panel upgrade for your GTA home? Call us at 416-838-9006 or visit our contact page — we will get back to you the same day.
Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp
