What a panel upgrade actually includes
An upgrade quote is really three jobs in one. First, the hardware: the panel itself, the breakers, and often a new meter base and service entrance cable. Second, the labor: most 200-amp upgrades take 8 to 10 hours of a licensed electrician's time, including coordinating the power shutoff with your utility. Third, the permit and inspection, which runs $200 to $600 depending on your jurisdiction.
The range you see in quotes comes from these three parts moving together. A straightforward panel swap in the same location, where the service entrance cable is already adequate, sits near the bottom of the range. A job that needs a new service mast, a relocated panel, or trenching to the meter climbs to the top.
Worked example: upgrading a 100-amp panel to 200 amps
Take a typical job: a 1970s ranch with a full 100-amp panel and plans for central air. The parts: a 200-amp, 40-space main breaker panel with breakers runs $450 to $900. Labor: 8 to 10 hours at $75 to $130 per hour is $600 to $1,300. The permit and inspection add $200 to $600.
Adding it up: $450 plus $600 plus $200 is $1,250 on the low end; $900 plus $1,300 plus $600 is $2,800 on the high end. That is the honest core of most quotes. If your quote lands well outside this band, ask what is different: a new service line, a panel relocation, or a service entrance rebuild are the usual reasons.
100-amp vs 200-amp vs 400-amp pricing
A 100-amp panel replacement (like-for-like, no service increase) is the cheapest option at $900 to $2,000, but it rarely makes sense for a house that will ever see a major electric appliance added. The step from 100 to 200 amps is where most homes land, at $1,200 to $3,500, and it is the standard recommendation for any home with central air, an electric range, a dryer, or an EV charger on the horizon.
A 400-amp service, usually two 200-amp panels, costs $2,000 to $6,000 and is for large homes over about 3,000 square feet, homes with multiple HVAC systems, or properties with a workshop, pool equipment, or more than one EV charger. Most houses never need it, but if your electrician is already opening the service, asking what the incremental cost of going to 400 amps would be is cheap insurance against a second upgrade later.
When a panel upgrade is not optional
Some upgrades are a choice; some are forced by the house or the market. You have little choice if you still have a fuse box (see our fuse box replacement guide), a 60-amp service, or a Federal Pacific or Zinsco panel, because many insurers will not write or renew a policy on them. Knob-and-tube wiring also effectively forces the issue, since a modern rewire needs a grounded 200-amp panel to land on.
The softer triggers matter too. If your main breaker trips when the AC and the oven run together, your service is telling you it is undersized. If the panel has no spare breaker slots and you are adding anything with a cord, you need space. And if your panel is 25 to 40 years old, budget for the upgrade as maintenance, not as an emergency.
What the day of the upgrade looks like
The electrician pulls the permit first, then schedules the work with your utility, which has to cut and restore power at the meter. On the day, power goes off for 4 to 8 hours. The old panel comes out, the new one goes in with fresh breakers, the grounding and bonding get brought up to current code, and the inspector signs off before the utility re-energizes. Plan around it: fridges stay closed, and anything on a UPS or a critical medical circuit needs a plan.
One thing homeowners miss: the inspector can flag other code issues they see while they are there, especially in older homes. This is not the electrician upselling you. It is how permitted electrical work works, and it is why the job should always be permitted.