If you’ve been told you need to “upgrade to 200 amps,” you might be wondering what that actually means — and whether it’s worth it. The amperage of your electrical service sets the ceiling on how much power your home can safely use at once, and modern households use far more than the homes of a generation ago.
Here’s a clear breakdown of the difference between 100-amp and 200-amp service, how to tell which your home needs, and what an upgrade involves.
What “amps” actually measure
Amperage is the maximum amount of electrical current your service can deliver at one time. Think of it like the size of a water pipe: a wider pipe lets more flow through at once. A 100-amp service can handle a modest load; a 200-amp service has roughly double the capacity, giving your home room for today’s appliances and tomorrow’s additions.
When 100-amp service is enough
A smaller home with gas heat, a gas range, and modest electrical demands may run comfortably on 100-amp service. If you’re not adding major loads and your breakers rarely trip, you may not need to upgrade at all. A professional load calculation tells you for sure.
When you need 200-amp service
Most modern homes — and nearly anyone planning an upgrade — are better served by 200 amps. You likely need it if you have or are adding:
- An EV charger (a major continuous load)
- Electric heat, a heat pump, or central air conditioning
- A hot tub, pool equipment, or a workshop
- A home addition or finished basement
- An older panel that’s already full or frequently tripping
Signs your current service can’t keep up
Your home will usually warn you before it becomes a problem. Watch for breakers that trip often, lights that dim when large appliances start, a panel that’s warm or buzzing, or simply running out of open breaker slots. Any of these is worth a professional evaluation.
What a 200-amp upgrade involves
Upgrading service is more than swapping the panel. It often includes a new meter base, service mast, grounding, and modern arc-fault and ground-fault protection to meet current code. It requires a permit, an inspection, and coordination with the utility for the disconnect and reconnect — all of which we manage. Most upgrades are completed in a single day.
This is not a DIY project
A service upgrade involves the conductors coming directly from the utility, and parts of that connection stay energized even with your main breaker off. The risk of severe injury is real. This is work for a licensed, insured electrician — full stop.
Frequently Asked Questions
Do I need 200-amp service for an EV charger?
Often, yes. A Level 2 charger is a large continuous load. Many 200-amp panels have room; older 100-amp panels usually need an upgrade or a load-management device. We confirm with a load calculation.
How long does a panel upgrade take?
Most residential service upgrades are completed in a single day. Your power will be off for several hours while we make the change.
Will an upgrade increase my home’s value?
Modern 200-amp service is a selling point and removes a common inspection concern, especially for buyers planning EVs or additions.