How Much Does an Electrical Panel Upgrade Cost?

Here's the quick answer: electrical panel upgrade cost in the Seattle area typically runs $2,500 to $7,500 for a 100A-to-200A upgrade, with the low end covering a straight panel swap and the high end covering a full service-entrance upgrade too. A like-for-like breaker box replacement at the same amperage is cheaper, usually $1,800 to $3,200. Bigger jobs — a 200A-to-400A upgrade for a large home with an EV, solar, and a heat pump — can run $8,000 to $14,000 or more.

That range is wide because “panel upgrade” covers a few genuinely different jobs, and the price depends entirely on which one your house needs. This guide breaks down every scenario, what drives the number inside each one, and how to know whether you actually need an upgrade at all. It's the same evaluation we run in the field on our panel upgrade & remodel work across the greater Seattle area.

Why Panels Get Upgraded

Nobody upgrades a panel for fun. It's almost always because something new is asking for power the panel wasn't built to deliver. The usual triggers we see across Seattle, Bellevue, and the Eastside:

• An EV charger pulling 40–60 amps continuously
• A heat pump or induction range replacing gas or oil
• A kitchen remodel, addition, or ADU adding new circuits
• A whole-house generator that needs a transfer switch tied into the service
• An aging panel that's simply full, failing, or an insurance liability

100A vs 200A: Is a 200-Amp Panel Now Required?

Short answer: no, not for your existing house. Electrical code isn't retroactive — a safe, properly working 100-amp panel doesn't become illegal the day a new code cycle takes effect, and nobody is coming to force a replacement on a panel that isn't causing a problem.

What's actually true is narrower and more useful: 200 amps has become the practical default for new construction and many major remodels, because a modern all-electric house — heat pump, induction range, EV charger, maybe a hot tub — runs the numbers in a load calculation right up against what a 100-amp service can deliver. So the code isn't saying “replace your panel.” It's that new permitted work has to pencil out under a current load calc, and 100 amps often doesn't leave room once you add what you're planning to add. That's also why some insurers ask about panel age and amperage at renewal — it can feel like a mandate, but it's underwriting judgment, not code.

Whatever you decide, the paperwork is the same either way: any panel work in Washington requires an L&I electrical permit and inspection, and the utility (Seattle City Light, PSE, or Snohomish PUD depending on where you are) has to be coordinated for the meter pull. There's no version of this job that skips that step.

Electrical Panel Upgrade Cost by Scenario

Here's what the pieces run in the Seattle area in 2026. These are honest ranges, not teaser rates — every Mad Dog Electric quote is broken out line by line, so the number you're given is the number you pay.

What Actually Drives the Price

Two houses on the same street can quote thousands apart for “the same” upgrade. It's almost never the panel brand — it's these five things:

• Whether the service entrance needs work — a new mast, meter base, or heavier conductors adds real labor and material on top of the panel itself
• Panel location and access — a garage-mounted panel is straightforward; one buried behind finished walls or in a crawlspace costs more to reach
• Number of circuits — every breaker moved to the new panel is labeled, tested, and terminated by hand
• Utility coordination — some meter pulls and re-energizes are same-day; others need extra scheduling depending on your utility
• Grounding and bonding — older homes often need a ground rod, water-pipe bond, or rebar bond brought up to current code as part of the job

Upgrade vs. Replacement vs. Sub-Panel

These three terms get used loosely, but they're different jobs at different price points, so it's worth being precise when you're getting quotes.

Replacementmeans the same amperage, fresh hardware — you're swapping a tired, damaged, or recalled panel (Federal Pacific and Zinsco are the two names to watch for) for a modern one rated the same. No capacity gain, just safer, code-current equipment. Upgrade means increasing capacity — 100A to 200A is the common jump — and it typically pulls in the service entrance too, which is the main reason an upgrade costs more than a replacement. Sub-panelis a different animal entirely: a second panel fed from your existing main, usually added for a garage, shop, ADU, or addition. It doesn't touch your service size at all, which is why it's often the cheapest of the three — as long as the main panel already has the spare capacity to feed it.

Signs You Need a Panel Upgrade

Some of these are obvious; some are easy to write off as “just how the house is.” If more than one sounds familiar, it's worth a real evaluation:

• Breakers keep tripping even under normal, everyday use
• The panel is full — no open slots for a new circuit
• You're planning an EV charger, heat pump, hot tub, or induction range
• The panel label reads Federal Pacific, Zinsco, or Pushmatic
• Lights dim or flicker when big appliances start up
• The panel is 30+ years old and hasn't been touched
• Your insurer is asking questions about panel age or brand at renewal

What Happens During Installation — and How Long It Takes

A panel upgrade follows the same four steps whether it's a simple swap or a full service upgrade. First, a site visit and load calculation — we look at the existing panel, the service entrance, and your grounding, and give you a line-by-line quote. Second, we pull the L&I permit and schedule the meter pull with your utility so the power comes off in one block, not spread across the day. Third is install day itself: the old panel comes out, the new one goes in, breakers get repopulated and labeled, and grounding gets brought to current code. Fourth, we meet the L&I inspector, then walk you through the finished panel.

Timeline-wise, expect the power to be off for 4 to 8 hours on install day — plan to be out of the house or have the fridge and freezer ready. A straightforward swap is usually done in a single visit; a full service upgrade with new mast and meter work can run a full day, and the inspection is sometimes scheduled a day or two after the physical work wraps up.

Can You Upgrade Your Own Panel? Don't.

This is the one electrical job we'd push back on harder than any other. Panel work is permitted electrical work in Washington — it has to be performed or supervised by a licensed electrical contractor, and it has to be inspected. Skipping that isn't just a paperwork risk; it can void your homeowner's insurance outright and it will surface at closing when you sell.

But the bigger issue is safety. The main breaker in your panel doesn't disconnect everything — the lugs feeding it stay energized straight from the utility transformer even with the main switched off, all the way until the meter is physically pulled. That's a fundamentally different hazard than replacing an outlet or a light fixture, and it's why even experienced electricians coordinate a utility meter pull before opening a panel can. If your goal is to save money, the honest move is getting two or three quotes rather than doing this one yourself.

Bottom line: budget $2,500 to $7,500 for a typical 100A-to-200A panel upgrade in the Seattle area, less for a same-amp replacement or a sub-panel, more for a large-home 400A service. We handle electrical panel replacement and upgrades across the greater Seattle area, from Everett down to Mercer Island — licensed, bonded & insured (Washington contractor license MADDODE754OB), permit included, hard quote up front. Reach us through the contact form or book a visit online.