Two problems that look identical from the kitchen
Almost everyone who calls about a panel describes the same thing: they want to add something, and they have been told the panel cannot take it. What they have not been told is which of two entirely separate problems they have, and the difference is thousands of dollars.
The first is a panel that has run out of breaker positions. The box is physically full. The service feeding it may still have plenty of capacity left. The second is a service that is genuinely too small for the load, regardless of how many slots are free. From inside the house these look the same, because in both cases the answer to "can I add this" is no.
They are told apart by arithmetic rather than by opinion, and the arithmetic takes about an hour. Where the totals sit comfortably under what the service can carry, a subpanel installation solves it for a fraction of the cost. Where they do not, an electrical panel upgrade is the real fix and a subpanel would only move the problem.
What a load calculation actually measures
A load calculation is not a guess based on the age of the house or the number of rooms. It totals the connected load against standard demand factors, because no house ever runs everything at once. What goes into it:
- Floor area, which sets the general lighting and receptacle load
- Fixed appliances: range, dryer, water heater, well pump, anything hard-wired
- Electric space conditioning, counted at whichever of heating or cooling is larger
- Car charging, which is a large continuous load and often the thing that tips a service over
- Shop, garage or suite circuits, which are frequently missed because nobody mentions them
The output is a number in amps. Compare it against the service rating stamped on the main breaker and you have your answer. A 100A service carrying a calculated 78A has room; the same service carrying 96A does not, and adding anything at all to it is a conversation about capacity rather than about slots.
This is also why the answer changes when your plans change. A homeowner told they need an upgrade for a car charger sometimes finds that EV charger installation with load management removes the need entirely, because the charger simply steps back when the rest of the house is busy.
What a service upgrade costs in Buffalo
A standard overhead 100A to 200A service upgrade runs $1,800 to $5,500, with most homes landing between $2,800 and $4,200. Figures shown are example ranges and pricing depends on the service entrance more than on anything inside the house. Higher-cost metros sit at the top of every range here.
Underground service is the outlier. Where the supply cable has to be trenched and replaced rather than swapped at a mast, the job moves to $5,000 to $8,000 or beyond, and the trenching is most of the difference.
Inside a typical number, the parts break down roughly like this:
- Panel and breakers: $400 to $800
- Meter base and mast: $300 to $600
- Electrical labour: $1,500 to $2,500, driven by how the service enters and how much grounding has to be brought to current code
- Permit and inspection: $150 to $400
The permit is the line worth checking on every quote you receive. Some include it, some do not, and a quote that is a single figure with no breakdown is hiding the answer rather than giving it. Permits and certificates explains what the inspection produces and why you want that document in your own file rather than in your electrician's.
When a subpanel is the honest answer
If the calculation shows headroom, a subpanel adds breaker positions without touching the incoming service. It earns its place near the load it feeds, which is why the usual homes for one are a detached garage, a finished basement or a workshop.
There is a third option people are sometimes shown, which is tandem breakers doubling two circuits into one slot. Some panels accept them and many do not, and fitting them to a panel that is not listed for them is one of the routes to breaker panel problems later. The panel label settles it, and where the label is missing or unreadable a panel and breaker inspection settles it instead.
Signs the service, not the panel, is the limit
Some symptoms point past the box to the supply itself. None of them is conclusive on its own, but together they usually mean the calculation is going to come back over:
- Lights dim noticeably when a large appliance starts, and keep doing it after the connection has been checked
- The main breaker itself trips, rather than an individual circuit breaker
- The service is 60A or 100A in a house that has since gained electric heat, a car charger or a suite
- Two-pole spaces have been used up and there is nowhere for a 240V circuit to land
A breaker that trips is doing its job, so the first step is finding out what it is protecting you from rather than replacing it. Tripping breaker diagnosis separates a genuine overload from a failing appliance or a breaker that has simply aged out, and you get the cause in writing before anything is priced.
Old wiring is a separate question that often arrives at the same time. A panel upgrade does nothing about branch circuits, so where the house still has knob and tube or aluminum branch wiring, that is its own scope and usually its own insurer conversation.
What to ask for before you agree to anything
Four questions separate a quote you can compare from one you cannot:
- What did the load calculation come out at, and what is the service rated for?
- What would a subpanel cost instead, and why is it not the answer here?
- Is the permit inside this figure or on top of it?
- Who books the inspection, and who receives the certificate afterwards?
An electrician who intends to pull the permit will answer all four without hesitation. If you only want to know where you stand before spending anything, an electrical safety inspection is the cheaper piece of work and it gives you the calculation to take to whoever you like.