Electrical Panel Upgrades: When You Need One and What It Costs

October 27, 2026 · Real renovation and flip numbers, start to finish

CC0, via Wikimedia Commons

If your panel is a Federal Pacific or Zinsco, or you're adding a sub panel, an EV charger, or a heat pump and your service is 100 amps or less, you probably need an upgrade. If your panel is a known brand, has empty slots, and nothing in the house trips breakers or flickers, you probably don't. This post is for homeowners planning a renovation, flippers scoping a house before close, and small investors who keep hearing "the panel needs to go" and want to know if that's true and what it actually costs.

Decide this first

The single variable that drives everything else is amperage versus planned load, not the age or look of the panel. A clean, 20-year-old 100-amp panel can be perfectly safe for a small house with gas heat and no EV. The same panel becomes a real problem the moment you add central air, an electric range, an EV charger, and a hot tub to that house. Figure out what the house will actually run after your renovation, then size the service to that. Everything else, brand recalls, double-tapped breakers, permit requirements, follows from this one number.

What to look for

Panel brand and known hazards

Some panels are a safety issue regardless of load. Federal Pacific Electric (FPE) panels with Stab-Lok breakers have a documented history of breakers that fail to trip during an overload, which is the one job a breaker has. Zinsco and GTE-Sylvania panels have a similar reputation for breakers that fuse to the bus bar. If you see either name on the panel label, plan to replace it. Insurance companies in some areas will decline to write or renew a policy over an FPE panel alone, so this can be a deal-driver even if nothing has gone wrong yet.

Amperage versus actual and planned load

Most homes built before the 1960s have 60-amp or 100-amp service. A 100-amp panel is often fine for a modest house with gas heat, gas water heater, and gas range. It gets tight fast once you add central AC, an electric range, an electric dryer, and especially an EV charger, which alone can draw 30 to 50 amps on its own circuit. If you're renovating and adding any of these, have an electrician do a load calculation rather than guessing. It's a standard, inexpensive step that tells you whether 100 amps is enough or whether you need 150 or 200.

Physical condition and capacity for new circuits

Open the panel cover (or have your electrician do it) and look for rust, scorch marks, double-tapped breakers (two wires under one lug), or a total absence of open slots. A panel that's full, with no room for a new circuit for a kitchen remodel or a finished basement, needs either a sub panel or a full replacement even if the amperage is technically adequate. Corrosion or discoloration around breakers is a sign of past overheating and should be looked at regardless of brand or age.

What to ignore

Smart panels and app-controlled breakers get marketed hard right now, and they're genuinely useful for some use cases, like load management for EV charging without a full service upgrade, or circuit-level energy monitoring. But for a standard renovation or flip, they're not a safety requirement and they add real cost, often $500 to $1,500 more than a standard panel. Don't let a quote upsell you into one unless you have a specific reason, like avoiding a utility service upgrade through smart load shedding. Similarly, panel brand prestige beyond "not on the recall list" doesn't matter much. A mid-range Square D, Eaton, or Siemens panel installed correctly will serve a house just as well as a premium line. You're paying an electrician for correct installation and code compliance, not for a logo.

Common mistakes

The most common mistake is sizing the panel to the current house instead of the renovated house. Investors scoping a flip often look at the existing panel, see it's "fine" for the current layout, and skip it, then add central air, a bigger kitchen with more circuits, and a finished basement during the renovation and run out of capacity halfway through the job. At that point you're paying for a panel upgrade anyway, plus the cost of reworking circuits that were already run, plus delay while you wait for an electrician and possibly a utility coordination appointment. Doing the load calculation before you finalize the scope avoids this.

The second mistake is hiring unlicensed or informal labor for panel work to save money. A panel serves every circuit in the house. A mistake here, a loose neutral, an undersized breaker, a wrong torque on a lug, can cause a fire months or years later with no warning. This is one of the few jobs where paying for a licensed, insured electrician and pulling a permit is not optional in any realistic sense. Permit inspections exist specifically because panel work is high consequence and hard to self-check.

The third mistake, common with flippers, is upgrading the panel but not telling the utility or not scheduling the utility's meter work. A service upgrade from 100 to 200 amps usually requires the utility to pull and reset the meter, and sometimes to upsize the service drop or transformer tap. If you don't coordinate this, your new panel sits dead until the utility shows up, which can take days to weeks depending on the area. Ask your electrician early in the process what the utility coordination looks like and build that lead time into your renovation schedule.

What it costs

These are general ranges. Actual cost depends heavily on region, whether the service entrance (the wire from the street or pole to the house) needs replacing, and whether the work is a straightforward swap or involves running new conduit and relocating the panel.

• Breaker replacement or minor repair: roughly $150 to $500 for a single breaker swap or fixing a loose connection, assuming the panel itself is sound.
• Sub panel addition: roughly $800 to $2,000, used when the main panel is full but has adequate amperage, common for finished basements or additions.
• Like-for-like panel replacement (same amperage, same location): roughly $1,200 to $2,500, typically a one-day job if the service doesn't need upsizing.
• Full service upgrade (100 amp to 200 amp), including new panel, new service entrance cable, and utility coordination: roughly $2,500 to $5,000 in most markets, more if the meter base or weatherhead also needs replacing or if the panel is being relocated.
• Complicated jobs: underground service, knob-and-tube remediation tied into the panel work, or panels buried behind finished walls that need to be exposed can push costs toward $6,000 to $8,000 or more. These are less common but worth flagging if your house is older or has had piecemeal electrical work over the decades.

Permit fees are usually a few hundred dollars on top of labor and materials, and most jurisdictions require an inspection before the panel can be energized. Factor in a week or two of lead time for permit approval in slower municipalities.

FAQ

Do I need a panel upgrade just because the house is old?

No. Age alone isn't the issue. A 100-amp panel from the 1970s with no recalled brand, no corrosion, and no planned heavy loads can keep running safely for years. What matters is brand, physical condition, and whether the amperage matches what you intend to run. Don't let a contractor sell you a panel upgrade purely on the basis that the house is old.

Can I sell or refinance a house with an FPE or Zinsco panel?

You can, but expect it to come up in inspection and possibly in insurance underwriting. Some insurers won't write a policy without replacement or a signed-off inspection from a licensed electrician stating the panel is safe. Buyers' agents increasingly flag these brands by name, so if you're flipping, replacing it before listing usually avoids a renegotiation later and is one of the more defensible costs to build into your budget up front. Fixer Files has generally found this is a cost worth paying early rather than negotiating around at closing.

How long does a panel upgrade take?

The electrical work itself is often one day for a like-for-like swap, or one to two days for a full service upgrade. The bigger variable is scheduling: permit approval, the electrician's availability, and the utility's appointment to pull and reset the meter. Build in one to three weeks of calendar time for the whole process, even though the hands-on labor is short.