100A vs 200A Electrical Panel Upgrade in Ontario (2026)
Adding an EV charger, a heat pump, a hot tub, or a basement suite? Your 100-amp panel — standard in most pre-2000 Toronto homes — may not have the capacity. A 200A upgrade is one of the most common electrical projects in the GTA right now. Here's what it costs and when you actually need it.
Quick Comparison
| 100A Service | 200A Service | |
|---|---|---|
| Upgrade cost (GTA) | — (existing) | $2,500 – $5,000 |
| Available capacity | 24,000 watts | 48,000 watts |
| EV charger (48A) | Tight — load calc required | Comfortable |
| Heat pump + EV + hot tub | Usually insufficient | Designed for this |
| Typical homes | Pre-2000 builds | New builds (2000s+) |
| Resale signal | Dated for modern loads | Expected by buyers |
Do You Actually Need 200A?
Not everyone does. An Ontario-licensed electrician must perform a load calculation (per the Ontario Electrical Safety Code) before any upgrade — this determines whether your planned additions fit on 100A.
- Probably fine on 100A: Gas furnace + gas water heater, no EV, no hot tub. Most daily life fits.
- Probably need 200A: EV charger (especially 48A/60A), electric heat pump, hot tub or sauna, basement apartment with its own stove/dryer, or any combination of two big new loads.
What the Upgrade Involves
- ESA permit — mandatory in Ontario. Only a Licensed Electrical Contractor (ECRA/ESA licence) can pull it. The work is inspected.
- Utility coordination — your electrician arranges a temporary disconnect with Toronto Hydro (or your local utility). Power is typically off 4–8 hours.
- New panel + mast/meter — the old panel, meter base, and often the overhead mast get replaced; grounding is brought up to current code.
- Inspection & reconnect — ESA inspects, then the utility reconnects. You get a certificate of inspection — keep it for insurance and resale.
Cost Breakdown (GTA, 2026)
| Item | Typical cost |
|---|---|
| 200A panel, breakers & labour | $2,500 – $4,000 |
| Mast / meter base replacement | $400 – $900 |
| ESA permit & inspection | $200 – $400 |
| Underground service (if applicable) | Add $1,500 – $3,000 |
| Drywall repair after | $300 – $800 |
Frequently Asked Questions
How long does the upgrade take?
Usually one full day: morning disconnect, panel swap, afternoon inspection and reconnect. Complex jobs (underground service, panel relocation) can run two days.
Can I upgrade to 200A in a condo or townhouse?
Condos: almost never — the building's infrastructure is fixed, and you'll need board approval for any electrical work regardless. Freehold townhouses: usually yes, same as a detached home.
Will my insurance go down with a new panel?
Possibly — especially if you're replacing a fuse panel or a recalled brand (Federal Pioneer Stab-Lok panels are a known insurance headache in Ontario). Tell your broker after the upgrade.
What's a load calculation?
A formal calculation per the Ontario Electrical Safety Code that totals your home's electrical demand. It determines the minimum service size legally required. Any reputable electrician does this before quoting an upgrade — if they quote without one, get a second opinion.
Should I go to 200A "just in case"?
If your panel is 25+ years old, full, or a problematic brand, upgrading proactively makes sense — you're paying for the panel replacement anyway. If your 100A panel is modern with spare breaker spaces and no big loads planned, save the money.
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