Do You Need a Panel Upgrade Before Installing an EV Charger?

"Do I need a panel upgrade?" is the question we hear on almost every free assessment call. It's the right question to ask — because the answer changes your cost significantly.

The short answer: about 30–40% of GTA homes we visit need some electrical panel work before we can safely install a Level 2 charger. The rest can proceed same-week with no panel work at all.

Here's how to figure out which group you're in.

What Does a Panel Upgrade Actually Mean?

Your home's electrical panel (also called the breaker box or load centre) is the hub that distributes electricity from the utility to every circuit in your home. It's rated by amperage — typically 100A or 200A for residential homes.

A panel upgrade means replacing your existing panel with a higher-capacity one. The most common upgrade in the GTA is 100A → 200A. Larger properties sometimes go 200A → 400A.

This is not the same as just adding a breaker. If your panel is full or undersized, there's no "just adding a breaker" — the whole panel has to come out.

Signs You Need a Panel Upgrade

Your Panel is 100 Amps

A 40A EV charger draws 40 amps continuously. On a 100A panel that's already running your HVAC, kitchen appliances, water heater, and lighting — that's too much to add safely.

The rule of thumb: if your main breaker says 100A or less, plan for a panel upgrade.

All Slots Are Taken

Even on a 200A panel, if every breaker slot is occupied, there's nowhere to add the new 40A circuit. Options include adding a sub-panel or replacing the existing one with a larger model.

Your Panel is a Known Problem Brand

Federal Pacific Electric (FPE) and Zinsco panels have well-documented safety issues — breakers that don't trip under overload, creating fire risk. If you have one of these, any reputable electrician will recommend replacement regardless of your EV plans. Might as well do it all at once.

Look for "Stab-Lok" printed on your breakers (FPE) or a colourful breaker lineup with the Zinsco name.

You Notice Performance Issues

Lights dimming when the dryer runs. Tripping breakers when multiple appliances are on. These are signs your panel is already at or near capacity. Adding a 40A load will make it worse.

Signs You Probably Don't Need a Upgrade

Your main breaker is 200A or more
You have at least 2 open breaker slots (one double-pole slot = one 240V circuit)
Your panel is from a reputable brand (Square D, Siemens, Eaton, Leviton)
No history of nuisance tripping

If all four of these are true, you're likely a straightforward installation.

What Does a Panel Upgrade Cost in the GTA?

| Upgrade Type | Typical Cost Range | |---|---| | 100A → 200A | $1,500 – $2,500 | | 200A → 400A | $2,500 – $4,000 | | Sub-panel addition | $800 – $1,500 |

These numbers include: new panel hardware, labour, ESA permit, and the Hydro One service upgrade coordination (which can sometimes add 2–4 weeks to the timeline — we flag this upfront).

The Assessment Process

A proper pre-installation assessment takes about 20–30 minutes:

Panel inspection — amperage, brand, available slots, breaker condition
Load calculation — estimating your current electrical demand vs. available capacity
Garage/charger location — cable run distance, conduit requirements
Written quote — everything itemized, no surprises on installation day

We do this at no charge. There's no obligation to book.

Can You Skip the Upgrade?

Sometimes. A load management device (like the Emporia Vue or Wallbox Eco-Smart) can monitor your home's total electrical draw and throttle the charger when other loads are high. This lets some 100A panel homes run a charger — just more slowly during peak household use.

It's not the ideal solution, but it's a valid one for homeowners who want to defer the panel upgrade cost.

Our Recommendation

Don't guess. A free 30-minute assessment gives you a definitive answer. We'll tell you exactly what your home needs, what it costs, and how quickly we can do it.

Call (647) 694-6394 or use the form below. We respond within 2 hours.