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Panel size is not something to guess at or default to the largest option available. The right size depends on your home’s actual and anticipated electrical load, not just its square footage. Here is how electricians actually determine the right panel size, from the licensed team at EZSMART, serving Toronto and the GTA.
A licensed electrician calculates this using a load calculation, which totals your home’s actual and anticipated electrical demand rather than relying on rules of thumb.
It might seem like defaulting to 200 amp gives you the most flexibility, and in some cases that is a reasonable choice, but it also costs more than a smaller panel and may be unnecessary capacity if you have no plans to add major electrical loads. A proper load calculation avoids both under-sizing your panel and paying for capacity you will not use. Quality panels from manufacturers like Eaton and Square D are available across these size ranges, so the decision usually comes down to your home’s actual needs rather than brand availability.
Is 100 amp enough for a modern home?
It can be, for smaller homes with standard appliance loads and no major planned additions, though many electricians now recommend at least 150 to 200 amp for future flexibility.
Do I need 200 amp for an EV charger?
Not always. It depends on your home’s existing electrical load. Some 100 or 150 amp panels can support an EV charger, while others need an upgrade. A load calculation confirms this.
How much more does a 200 amp panel cost compared to 100 amp?
Cost varies by home and existing wiring, and a licensed electrician can provide an accurate quote comparing your options after assessment.
Can I upgrade my panel size later if I undersize it now?
Yes, but it means paying for a second upgrade project later. Planning for reasonably anticipated future needs upfront is often more cost effective.
Not sure what panel size your home needs? EZSMART provides licensed load calculations and panel upgrades across Toronto and the GTA. Call 416-838-9006, and see what our customers say on our Google reviews page.
Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp
