Do You Need an Electrical Panel Upgrade? A Phoenix Homeowner's Guide to Signs, Costs, and Amp Sizes
If your breakers trip every time you run the microwave and the dishwasher at once, this guide is for you.
Short answer: if your home is drawing more power than it used to (think EV charger, pool pump, added AC unit, solar, a home addition) and your panel is still rated for what a house needed in 1985, it's probably time. Below is what actually pushes a Phoenix home past its panel's limit, what the different amp sizes get you, and roughly what the whole thing tends to cost based on service in the greater Phoenix metro area.
Why Does This Come Up in Phoenix Specifically?
Two things collide in this market specifically. First, a huge share of homes in Sun City, Sun City West, Peoria, and older pockets of Phoenix and Glendale were built between the 1960s and 1980s, often with 60-100 amp service and, in some cases, panel brands like Federal Pacific or Zinsco that are now widely recognized as fire hazards and are no longer manufactured or supported.
Second, everyone's asking those same older panels to do more. Central AC running six months a year, pool equipment, a Level 2 EV charger in the garage, rooftop solar with battery backup. None of that existed at this scale when a lot of these homes were wired. A panel that was fine for a 1978 kitchen remodel is not fine for a 2026 EV charger and a heat pump.
What are The Signs Your Panel Needs an Upgrade?
A few of these on their own aren't necessarily a big deal. Several of them together, especially in an older home, are worth a call.
Breakers trip regularly, not just during an obvious overload
Lights flicker or dim when a big appliance (AC, dryer, microwave) kicks on
The panel itself feels warm to the touch or you notice a burning smell near it
You hear buzzing or crackling from the panel
You're using a lot of extension cords or power strips because there aren't enough circuits
Your panel is a Federal Pacific Stab-Lok or Zinsco brand
You want to add an EV charger, solar, a workshop, an ADU, or a hot tub and your electrician says there's no room left
Your home still has a fuse box instead of breakers
If your panel is warm, buzzing, or smells like anything burning, that's not a "schedule it for next month" situation. Turn off what you can and call an electrician the same day.
200A vs. 400A vs. 800A: What Are You Actually Buying?
People hear these numbers and assume bigger is always better, or get quoted a number that means nothing to them, here's the plain-English version.
100A is what a lot of older, smaller Phoenix homes still have. It was standard decades ago but leaves almost no room for anything added on top; no EV charger, no solar, sometimes not even a second AC unit.
200A is the standard for most modern single-family homes today. It comfortably handles central air, a full kitchen, an EV charger, and typical additions like a pool pump or a workshop, without much drama.
400A starts to make sense for larger homes, homes running two AC systems, homes with solar plus battery storage, or anyone planning a serious addition (guest house, large shop, second EV charger) down the line. It's also common when a homeowner would rather do the electrical work once and have headroom for the next 15 years instead of upgrading twice.
800A is the outlier. It's not really a residential-standard size, it shows up for larger estate properties, homes with heavy solar and battery setups, or properties that function partly as a small commercial operation. If you're in this territory, the honest answer is that it needs a site visit and a custom design, not a number off a price list.
What Does a Panel Upgrade Actually Cost in the Phoenix Area?
Here's what we actually charge, not a scraped-together national average. These are our base bid prices for a standard installation.
200 Amp panel upgrade $4,200 base bid, plus permit
400 Amp panel upgrade $8,500 base install
800 Amp service Custom quote, needs a site visit
A couple of things worth knowing about those numbers. They assume a standard installation with attic access available. If your panel is in a tricky spot, your attic isn't accessible, or there's something unusual about how your home is wired, the price can move based on what that actually takes to work around. And 800A jobs are uncommon enough, and specific enough to the property, that we don't quote them off a price list. We'll come look at what you've got first.
If you're doing an EV charger, a spa, or a few smaller electrical upgrades at the same time as a panel job (or even on their own), here's what those typically run.
EV charger wiring: $450 to $2,500, depending on distance from the panel and a few other factors
Spa or hot tub circuit: $1,200 to $2,500
4 LED recessed (can) lights in one room: $850
New ceiling fan point with dual switching: $395 (client supplied fan)
Wall-mounted TV point: $495 (outlet plus low-voltage wiring, hangs a customer-supplied TV up to 65 inches).
Same caveat applies to all of these: standard installation, attic space available. If something about your setup makes the job harder than usual, that gets reflected in the final number, but you'll hear about it before we start, not after.
The only way to get an exact number for your specific home is a walkthrough. An electrician needs to see your existing panel, your attic access, and what you're trying to power before giving you something you can actually rely on.
Permits and Licensing in Arizona
Panel upgrades in Arizona require a permit and need to be done by a licensed contractor. This isn't a weekend DIY project, and for good reason: a panel is your home's main point of failure if it's wired wrong. County Electric is AZ ROC licensed (#233011), and permitted work also matters at resale. An unpermitted panel swap is a common thing that trips up home inspections and insurance claims down the line.
Frequently Asked Questions
Can I upgrade my panel myself to save money? No. Panel work involves the main service connection to your home and, in most cases, coordination with the utility company to disconnect and reconnect power. It requires a licensed electrician and a permit in Arizona, and doing it yourself risks both your safety and your home insurance coverage.
Will I be without power during the upgrade? Usually for part of a day. Most residential panel upgrades are completed in one day, with power off for a portion of that time while the old panel is removed and the new one connected.
Do I need a bigger panel just to add an EV charger? Not always. Many homes with 200A service have enough spare capacity for a Level 2 charger, and standard EV charger wiring on its own typically runs $450 to $2,500 depending on where your panel is and how far the run is to your garage. It depends on what else is already running on your panel. An electrician can check this with a load calculation before you spend money on an upgrade you don't need.
How long does a panel actually last? Most panels are built to last 25-40 years, but that assumes no safety issues with the brand and no damage from heat, moisture, or pests. Age alone isn't the only factor. A 15-year-old panel that's undersized for your home can need replacing sooner than a 30-year-old one that's still adequate.
Does a panel upgrade increase my home's value? It can, particularly for older homes. Buyers and inspectors both pay attention to panel condition, and a documented, permitted upgrade removes a common point of negotiation during a home sale.
What's the difference between a panel upgrade and just adding a subpanel? A subpanel adds circuits without replacing your main panel. It's a cheaper option if your main panel has room but you need more circuits in one area, like a garage or workshop. A full upgrade replaces the main panel itself when you've outgrown its total capacity, not just its number of open slots.
If any of this sounds like your house: tripping breakers, an EV or solar project on the horizon, or a panel brand that made you nervous when you Googled it, County Electric can take a look and tell you straight whether you actually need an upgrade or something smaller will do the job. We've been doing this work in the Phoenix area for over 20 years, and are proud to continue to serve the community with honesty, efficiency, and quality work on every home. Need an estimate? Give us a call today, or get in touch here.
