Electrical panel upgrade, starting with whether you need one

What is panel upgrade?

A panel upgrade replaces your breaker box with a larger one - more amperage, more breaker spaces, modern arc-fault and ground-fault protection. It is a capacity decision, and the honest way to make it is a load calculation: an electrician adds up your home's real demand and compares it against your service size. Plenty of 100-amp homes pass that test comfortably. The ones that fail are usually adding an EV charger, a heat pump, or an induction range.

Signs you need panel upgrade

• You are planning something big and electric - an EV charger, a heat pump, a heat-pump water heater, an induction range, a hot tub, or a workshop - and someone has told you the panel "might not take it"
• Your panel has no empty breaker spaces left, and the ones in use include tandem or "cheater" breakers doubled into a single slot
• You have a fuse box rather than a breaker panel, or a panel with a known defect history (Federal Pacific Stab-Lok, Zinsco, Challenger)
• Breakers trip when two ordinary appliances run together - not one faulty circuit tripping, but the whole house feeling short of headroom
• Your main breaker itself trips, which is a different and more serious signal than a branch breaker tripping
• There is rust, scorching, moisture staining or a burnt smell inside or around the panel enclosure

Seeing something not on this list? Browse electrical problems by symptom →

How panel upgrade actually works

1. 1

   Load calculation - the step that decides everything else

   An electrician totals your home's demand: general lighting and receptacle load by square footage, then the large fixed appliances - range, dryer, water heater, HVAC, EV charger - with the demand factors code allows. The result is a number in amps that you compare against your service rating. This is arithmetic, not opinion, and it is the only honest basis for the recommendation.

   Watch forA quote with no calculation behind it. "You've only got 100 amps, you'll need 200" is a sales line, not a finding. Ask for the calculation on paper. A contractor who will not produce one is telling you they did not do one.

2. 2

   Distinguishing a panel upgrade from a service upgrade

   These are different jobs at very different prices. A panel upgrade swaps the breaker box while the incoming service - the utility conductors, the meter, the service entrance - stays as it is. A service upgrade replaces that incoming infrastructure too, and it involves the utility. If your existing service conductors are already rated for the amperage you want, you may only need the first.

   Watch forA quote that says "200 amp upgrade" without specifying whether the meter, service conductors and mast are included. That ambiguity is where change orders live. Get it itemised.

3. 3

   Panel and breaker selection

   Sizing is not just amperage - it is also spaces. A panel that is technically 200 amps but has no room for future circuits solves half the problem. Modern panels also bring arc-fault and ground-fault breaker requirements that older boxes did not have, and those breakers cost meaningfully more than the plain ones they replace.

   Watch forBreakers that are not listed for the panel they are installed in. They often snap in physically and are not approved for it. Also watch for a panel chosen because the crew had it on the van rather than because parts for it will still be available in fifteen years.

4. 4

   Permit and inspection

   A panel upgrade is permitted work almost everywhere. The permit is normally pulled by the electrician, and an inspector signs off before the work is considered complete. In many jurisdictions the utility will not reconnect or re-energise until that sign-off exists. Requirements and fees vary by city and county - confirm locally rather than assuming.

   Watch forAn offer to do it without a permit. It creates a problem at resale, it can void an insurance claim, and it means nobody independent ever looked at the work.

5. 5

   Grounding and bonding brought up to current standards

   Older homes often have grounding arrangements that were acceptable when installed and are not what current code expects. Bringing the grounding electrode system up to standard is routinely part of the job, and it is one of the genuine safety improvements in a panel upgrade - not an upsell.

   Watch forGrounding treated as an optional line item you can decline. It is not the place to economise, and an inspector is likely to fail it anyway.

6. 6

   Changeover day and the outage

   Circuits are labelled and disconnected, the old panel comes out, the new one is mounted and each circuit is landed on its breaker. Your power is off while this happens - plan for most of a working day. Straightforward panel-only swaps are usually a single day.

   Watch forNo plan for the outage. Ask before the day: how long, what time it starts, and whether anything medical, a home office, or a full freezer needs arranging around it.

7. 7

   Labelling, testing and handover

   Every breaker should be labelled with what it actually controls - verified, not copied from the old door card, which is wrong in most houses. Arc-fault and ground-fault devices get tested. You should end up with a legible directory, the permit sign-off, and the load calculation.

   Watch forA handwritten label sheet transcribed from the old panel. If nobody walked the house with a circuit tracer, the directory is fiction, and it is the thing you will need most in an emergency.

What does panel upgrade cost?

A panel-only upgrade, where the utility service stays as it is, commonly runs roughly $2,000 to $4,000. Once the meter, service conductors and mast have to be replaced too, it becomes a service upgrade and the range climbs steeply - often five figures. Local labour rates and permit fees move both numbers.

See the full panel upgrade cost guide - by material, size and region →

If the number is the problem, here are the ways people pay for it →

Electrical load and capacity calculators → Work out your demand before you take a quote.