Electrical Panel Upgrade

When Do You Need a Panel Upgrade?

Your electrical panel is the heart of your home's power system. When it can't keep up—or when it's actively dangerous—you'll know.

Outdated Panel Brands (Federal Pacific & Zinsco)

If you own a home built between 1950 and 1990 in Phoenix, Scottsdale, or Tempe, there's a real chance you have a Federal Pacific Electric (FPE) or Zinsco panel. These aren't just old—they're documented fire hazards.

FPE breakers fail to trip during overloads in testing, allowing wires to overheat. Zinsco panels corrode internally, especially in Arizona's heat, causing breakers to fuse to the bus bar. Both have been linked to thousands of house fires.

Insurance companies know this. Some won't even write policies on homes with FPE panels. Others charge higher premiums. Home inspectors flag them immediately during sales.

If you see "Federal Pacific," "FPE Stab-Lok," or "Zinsco" on your panel door, replacement isn't optional. It's overdue.

Insufficient Amperage for Modern Loads

Most Arizona homes built before 2000 have 100-amp service. That worked when the biggest loads were a refrigerator, water heater, and maybe a window AC unit.

Now? Your dual-zone HVAC system alone pulls 60 amps on a July afternoon in Gilbert. Add an EV charger (40-50 amps), a pool pump (20 amps), and you're constantly tripping breakers—or running circuits dangerously close to capacity.

Sound familiar? You plug in a space heater and the whole bedroom goes dark. Your electrician says "no room" when you ask about adding a circuit for that new mini-split. You can't install solar because there's nowhere to land the inverter feed.

The math is simple: 200-amp service gives you the headroom modern Arizona homes need. It's not about what you use today—it's about not doing this again in five years when you add that backyard casita or upgrade to a heat pump.

If you're planning any major addition—EV charger installation, pool electrical work, or a kitchen remodel—start with the panel. Everything else builds on that foundation.

How to Choose an Electrical Panel Contractor in Arizona

Panel upgrades are one of the few electrical jobs where the wrong contractor can burn your house down—or at minimum, fail inspection and leave you without power for days. Here's what separates the pros from the hacks.

Licensing and Insurance Requirements

Arizona requires a Residential or General Journeyman Electrician license minimum for panel work. Most reputable contractors carry a C-11 Electrical Contractor license from the Registrar of Contractors. Ask for the license number. Verify it's active at azroc.gov.

Insurance matters more here than almost any other trade. If something goes wrong during a panel swap—crossed phases, improper bonding, a utility strike—you need to know that contractor's liability policy will cover it. Ask for proof of both general liability ($1M minimum) and workers' comp.

Questions to Ask Before Hiring

Don't just ask "how much?" Ask these:

• Do you coordinate directly with [APS/SRP], or do I have to schedule the meter disconnect? You want a contractor who handles this. It's a red flag if they expect you to call the utility.

• What's included in your quote—permit, inspection, reconnection fees? Some contractors lowball the install price then nickel-and-dime you on permits and utility coordination.

• How do you handle service line upgrades if my existing line won't support 200 amps? The answer should include checking existing service capacity during the estimate and coordinating with your utility if an upgrade is needed.

• Will you label all circuits and provide a panel schedule? This should be standard. If they say "we can do that for extra," walk away.

• What's your timeline, and how much of it depends on utility scheduling? Honest contractors will tell you: "Two days of work, but we're 2–3 weeks out on APS appointments right now."

Red flags: Cash-only pricing. No permit mentioned. "We'll call it a repair so you don't need inspection." Inability to explain how they'll handle the meter disconnect. Any version of "the city inspectors are too picky—we know what we're doing."

If you're in an older Tempe or central Phoenix neighborhood with a Federal Pacific or Zinsco panel, prioritize contractors who've done a lot of FPE/Zinsco replacements. These jobs sometimes reveal additional issues—corroded bus bars, amateur additions, aluminum wiring connections that need remediation. You want someone who's seen it all.

The best way to find qualified contractors? Look for those who also handle related work—sub panel installation, dedicated circuits, whole house generator connections. These aren't one-trick operations. They're full-service electrical contractors who see panel upgrades as foundational work, not side jobs.

Compare at least three licensed contractors. Ask about their experience with your specific utility company. And if your home inspector or realtor flagged your panel as a safety issue? Don't wait for the right price—wait for the right contractor who can do it correctly the first time.