Why nobody can quote a panel upgrade over the phone
A panel upgrade sounds like a product: take the old box off the wall, put a new one on. In practice the panel is often the cheapest component in the job, and what surrounds it decides the price.
Two homes on the same street, built the same year, can carry genuinely different quotes because one has an underground service and adequate grounding while the other needs a new mast, meter socket, and ground rod.
Any contractor who gives you a firm number before seeing the installation is either padding it heavily or planning to revise it later.
The service size you actually need
This is the first variable, and it is where money gets wasted in both directions. Undersizing means doing it again in five years. Oversizing means paying for capacity nothing will ever draw.
The answer comes from a load calculation on your specific house: what is installed now, what you plan to add, and how those loads behave together. 200 amps is the common answer for a home adding a car charger or a heat pump, but common is not the same as correct.
- What is installed today, including electric range, dryer, and air conditioning
- Whether heating is gas, oil, or electric, now or after a planned conversion
- Car charger, hot tub, workshop, or finished basement in the plan
- How many of those loads can realistically run at the same time
Whether the service entrance comes with it
The service entrance is everything between the utility connection and your panel: the cable, the mast on the roof or the underground conduit, and the meter socket.
If those are sound and rated for the new service, the job is mostly panel work. If they are undersized, corroded, or damaged, they are replaced too, and the cost moves substantially. Overhead services also need the utility to disconnect and reconnect, which adds scheduling but not usually much cost.
What the inspector will find
A panel upgrade brings the installation under inspection, and the inspector looks at more than the new box. Grounding and bonding get checked against current code, and older homes frequently need a new ground rod or a water pipe bond added.
Occasionally a circuit fails inspection and has to be corrected as part of the work. A good quote will tell you this is possible rather than discovering it on the day and treating it as a change order.
- Grounding electrode and water pipe bonding brought to current code
- Circuits found to be unsafe when the panel is opened
- Aluminium branch circuits needing correct terminations
- Panel location that no longer meets clearance requirements
Permit fees and town differences
Every panel upgrade needs a permit and an inspection by the town's wiring inspector. Fees vary across Greater Boston, and so does how quickly a town processes and schedules.
That variation is worth asking about, because it affects your timeline more than your budget. A contractor who works regularly in your town will usually know what to expect.
How to read two quotes side by side
The cheapest quote is often the one that has assumed the least. Before comparing numbers, check that both cover the same scope.
- Does it state the service size, and is it the same in both?
- Does it include the service entrance, mast, and meter socket, or exclude them?
- Is the permit included, and who attends the inspection?
- Does it say what happens if the inspector requires corrections?
- Is the price fixed, or an estimate that can move?