That sentence is about capacity, and capacity is a measured thing rather than an opinion about your panel. This page is about how it gets measured, what actually changes when a service is made larger, which panels cannot be added to at all, how the day itself runs in order, and which half of the work belongs to the power company rather than to us.
The electricians who do it trade as American Electrical Services and hold Idaho Electrical Contractor License LIC# 3671445. The on-site estimate is free, and it is where the load calculation actually happens — (208) 782-8268.
How do I know if my panel is too small?
You find out from the main breaker and a load calculation — not from how full the box looks, and not from the age of the house. Those two things get confused constantly, and they are separate findings with separate prices.
Start with the number, because three different figures all get called "the panel size" and they are not the same figure.
- The rating on the panel label. Inside the door, or on a sticker beside the breakers. It tells you the largest service that box is built to accept — not what is feeding it. A panel stamped 200 can perfectly legally be fed by a 100 amp service, and there are houses out here where that is exactly the arrangement.
- The main breaker. The number stamped on its handle is the most honest single figure in the house. That breaker is what physically limits how much the house can pull at one moment.
- The service entrance conductors and the meter socket. The wires coming in and the enclosure the meter plugs into were sized for the service the house was built with, and they cap everything downstream no matter what the label says.
Your real capacity is the smallest of those three. That is why "I already have a 200 amp panel" is not the end of the conversation.
Two panels resist being read that way, and both turn up in valley houses of a certain age. The first has no single main breaker at all — the top of the box carries several two-pole breakers side by side, and you are meant to shut the house down by throwing more than one of them. The second is a fuse panel, where the size lives on a pull-out block rather than a breaker handle. If you cannot find a number on yours, photograph the open door and we will read it for you over the phone.
Then the arithmetic. A load calculation adds up what the house is entitled to draw and compares it to what the house is fed. Conditioned square footage produces a base allowance for general lighting and receptacles. On top of that go the small-appliance and laundry circuits every kitchen and laundry is required to have. Then the nameplate of each fixed appliance — range, wall oven, cooktop, dryer, water heater, dishwasher, disposal, built-in microwave, well pump, hot tub, charger. Then the larger of heating or cooling, but not both, because no house runs the furnace and the air conditioner in the same weather. Then demand factors, which discount the running total on purpose. Then extra headroom on anything continuous.
There is a second route for a house that has already been lived in: the highest demand the meter itself has recorded, scaled up for headroom, with whatever you are adding stacked on top. Sometimes it lands lower than the paper calculation, and a house that looked like it needed a larger service turns out not to.
Why the house was fine for decades and is not fine now is the part worth understanding, because it is not that you added "too much." A house wired for 100 amps was drawn around gas heat, a gas water heater, an electric range and an electric dryer. Every one of those is intermittent — the toaster runs for minutes, the dryer runs and stops, the oven cycles. An electrician calls that diversity, and it is the entire reason a house whose appliance nameplates add up to far more than 100 amps has lived comfortably on 100 amps. Nothing ever ran at once.
What people add now breaks that pattern in one specific way: it runs long, and it runs at the same hours as everything else. A car charger draws steadily for hours, and those hours land in the evening. A heat pump or an electric furnace runs through the coldest afternoons instead of in bursts, and it moves the largest single load in the house off the gas meter and onto your panel. An induction range pulls hard in the same hour the car is charging. A hot tub carries a heater and a pump and cycles year-round. Anything running three hours or more without stopping is a continuous load and gets sized with headroom above its actual draw, so a charger set to 48 amps needs a 60 amp circuit behind it. The new equipment eats more of your service than its own label suggests, and it eats it in the same evening as everything else you added.
Comparing the result against what is installed produces one of three answers, and we will say all three out loud:
- The service is fine and the panel is simply out of room. Nothing is wrong with the service; the box has run out of slots. A sub-panel, a circuit rearrangement or a load management device all solve it, and all cost less than changing the size of the service.
- The service is fine and the panel itself is the problem. A damaged bus, heat or water damage, or a box nobody makes parts for. Replacing it at the same service size is the smaller job, and the power company never has to be scheduled into it.
- The calculated load genuinely exceeds the service. Now the upgrade is the right call, and you get to see the math that got us there.
An electrician who arrives at the third answer every single time is not calculating anything.
What does upgrading to 200 amp actually give me?
Headroom and slots — in that order, because they are two different purchases and people usually only want one of them.
Headroom is the real one. Going from 100 amps to 200 doubles what the house is permitted and wired to draw at one instant. That is what lets the charger, the heat pump, the range and the dryer overlap in the same evening without the main breaker deciding the question for you. It is also what makes the next thing possible without another conversation — the shop circuit, the second charger, the air conditioning that replaces the swamp cooler.
Slots come along with it, because a service change is a panel change too. The new panel is specified with spaces deliberately left empty, and the circuits you were told to wait on stop being an argument with the box.
Three things come with the swap that nobody puts on a sales sheet:
- A single main disconnect. One switch that kills the whole house. If you are coming off a split-bus or a fuse panel you have never had that, and it matters most to whoever needs it in a hurry.
- Grounding and bonding brought to current requirements — ground rods, the water-pipe bond, the connection between them. On a house wired before those rules existed this is a build rather than a reconnect, and it is the half of the system that does nothing at all until the moment something faults.
- A directory that is true. Every circuit landed, tested and labeled by somebody who has just traced it, instead of a door full of pencil marks from three owners ago.
And an honest list of what it does not give you:
- It does not lower your power bill. Amps are capacity, not consumption. The service size sets how much the house is allowed to draw at one moment; the bill follows the kilowatt-hours you actually use. The same refrigerator does not use more power behind a 200 amp service, and it does not use less.
- It does not repair a circuit. A dead outlet, a light that flickers, a breaker tripping because of an actual fault — none of those is a capacity problem, and a new panel will not touch them. That is electrical repair.
- It does not replace the wiring in your walls. The branch circuits are the same ones the day after. What changes is what feeds them.
The last thing worth saying is that bigger is not automatically better. Going up past 200 pulls the meter socket, the service entrance conductors, sometimes the mast and sometimes a trench along with it. That is the correct answer for an acreage with a shop, a well and a second dwelling on it. It is the wrong answer for a small gas-heat house with nothing planned, and we would rather size it than sell it.
Is my old panel dangerous?
Usually the honest answer is no — it is not about to catch fire, it simply cannot be added to. A short list of panel lines is genuinely different, and it is worth knowing which list yours is on.
Start with the part that has nothing to do with the brand, because what makes a panel dangerous is most often what somebody did inside it. Two conductors jammed under a lug built for one. Tandem breakers crowded into slots the manufacturer never rated for them. A breaker of one brand clipped onto another brand's bus because it fit. Neutrals and grounds sharing a terminal. Wire too thin for the breaker protecting it. Heat discoloration, or a bright green bloom on the bus. Any one of those turns "we just want one more circuit" into a longer conversation, and none of them is visible with the cover on.
Then the lines with histories of their own:
- Federal Pacific Stab-Lok. A documented failure-to-trip history — the handle stays in the on position while the circuit behind it is in trouble. If one of these is on your wall it goes into the written estimate even when it is not remotely what you called about, along with the reason. Whether you replace it is your decision, and it is not a condition of us doing other work for you.
- Zinsco and Sylvania-Zinsco. Long-documented trouble right at the connection between the breaker and the bus bar. Adding a circuit means clipping a new breaker onto exactly that connection, which is the wrong place to be optimistic.
- Bulldog Pushmatic. Nothing dramatic here at all, which is why it surprises people. The breakers push in rather than clip on, they went out of production long ago, and the used ones people find carry unknown history and real prices. More decisively: no arc-fault or ground-fault breaker is made for that panel. Current code requires those on more circuits every cycle, so the first circuit your project needs cannot go into that box. The panel is not a hazard. It is a dead end.
- Split-bus panels. They work. But there is no one switch that kills the house, and the section feeding the lighting circuits is where they run out of room. The two problems arrive together: nowhere to add a circuit, and no single place to shut the house off.
- Fuse panels. Not automatically an emergency — a correctly sized fuse protects a circuit perfectly well. Two things make them a problem. There is no way to add a circuit to one without hanging a sub-panel beside it. And sooner or later somebody puts a 30 amp fuse into the holder for a 15 amp circuit because the 15 kept blowing, which removes the protection entirely and leaves no trace that anything changed. They are also the panel type insurers and buyers' inspectors ask about by name.
And the answer nobody expects from an electrician: sometimes the panel is fine. A newer house arrived with a correctly sized service and a sound panel that has merely filled up. That is a sub-panel, not a service upgrade, and you should be told so plainly.
One exception to everything above. If the panel is warm to the touch, buzzing, smells hot, or has browning around a breaker, that is not a planning question and it does not wait for an estimate. Stop using that circuit, kill the main if you can reach it safely, and call.
How long does a panel upgrade take?
The wiring is the predictable part. What sets the calendar is three things nobody in the truck controls: the permit, the inspection and the utility.
Here is the order the work actually runs in, because knowing the order tells you where the waiting really is.
1. Every circuit gets identified and labeled before anything is opened — while it still has power on it, because that is the only time tracing a circuit is easy. Skipping this step is why some houses come out of a panel swap with a door full of guesses.
2. The utility disconnects. On an overhead service they drop the connection at the point of attachment or open it at the pole; on an underground service they pull the meter. From here the house is dark.
3. The old panel and the meter socket come out. Both of them. On a service change the socket was sized for the smaller service too, and homeowners are routinely surprised that the enclosure outside is part of an inside job.
4. The new service entrance goes in — meter socket, service entrance conductors, and on an overhead service a new mast and weatherhead. Aluminum service entrance cable is normal and correct here, and it is neither the same material nor the same story as the aluminum branch wiring that worries people in a house of that era.
5. The new panel and main breaker are set, and grounding and bonding are brought up to current requirements. This is the step that expands on an older house, because there is often nothing there to reconnect to.
6. Every circuit is landed, tested and labeled. A taller box moves the terminals, so branch conductors that reached the old panel frequently will not reach the new one. Those get a listed splice inside the enclosure and a short extension to the terminal — never a wire pulled tight across the can, which is how a neutral works itself loose two winters later. Arc-fault and ground-fault protection goes onto the circuits current code requires it on as they come back in.
7. The inspection. Somebody who does not work for us signs the work off, and that independence is the entire value of it.
8. The utility reconnects and re-seals the meter.
Steps two, seven and eight sit on other people's calendars. A permit and an inspection cost days rather than hours of labor, and no amount of hustle on our side compresses either one. That is why an honest answer about timing has a shape rather than a number, and why you get the shape at the estimate instead of a promise over the phone.
What stretches a job past its shape: the meter has to move because the utility's clearance rules say so; the drop or the buried lateral feeding the house is too small for the new service and the utility has to replace it first; the mast turns out to be rotted where it enters the wall; the wall behind the panel is masonry rather than framing; or the last several people who worked in the box left circuits that have to be traced one at a time before anything can be landed.
A panel replacement that keeps the same service size skips steps two and eight entirely. That is the single biggest fork on this page.
Will my power be off all day?
On a panel replacement at the same service size, no — the power goes off when we start and is back on before we leave, because nothing in that version of the job waits on anybody else. On a full service change it depends on when the inspector and the utility land, and that is a conversation to have at the estimate rather than at seven in the morning on the day.
When the inspection and the reconnect both fall on the same day, the power comes back that day. When the inspection slides to the next morning, the house is dark until it clears. You are told which of those is likely when the job goes on the schedule, and if it changes you hear it from us before you notice it yourself.
Say something at the estimate if any of these are true at your house. One sentence changes how the whole job gets scheduled, and sometimes it changes it into a temporary feed or a two-visit plan instead of one long dark stretch:
- Refrigerated medication, an oxygen concentrator, or a CPAP
- A medical device that lives on a charger
- A sump pump with a live water table under it
- A private well — no power means no water, not just no lights
- A home office or a business run out of the house that genuinely cannot go dark
- A tenant in the house who is not you, so the person losing power is not the person approving the job
What helps on the day itself: turn the refrigerator and freezer down the night before and keep the doors shut; charge phones and laptops; find the manual release cord on the garage door before you need it; if you are on a well, fill what you need before the crew arrives; and clear the working space in front of the panel, because the freezer parked against it has to move regardless and it is easier without a deadline attached.
Does the power company have to be involved?
For a change in service size, always. For a panel replacement at the same size, not at all — and that single difference decides whether your job runs on our calendar or on theirs.
The reason is a boundary that sits in a different place than the one people picture.
On an overhead service, the utility's wires run from the pole to a bracket on your house — the point of attachment. Everything from that bracket inward belongs to the property: the weatherhead, the mast or conduit carrying the wires down the wall, the service entrance conductors, and the meter socket. The meter itself is the utility's, and it is sealed.
On an underground service, the utility owns the buried lateral running to the meter. The trench, the conduit and putting the yard back afterwards are frequently the property owner's to provide, which is where an underground upgrade picks up cost that an overhead quote never shows.
Three practical consequences fall out of that line:
1. We do not break a meter seal. Not as a policy we chose — the utility will not accept work where somebody did. Cutting the power and restoring it is theirs, and scheduling those two visits, rather than the wiring between them, is what stretches a service change across a calendar.
2. A rotted mast, or a weatherhead pulled loose from the siding, is ours to replace even though it is the utility's wires hanging off it. Homeowners get told the opposite by a neighbor with real confidence.
3. If the drop or the lateral feeding the house is too small for the new service, replacing it is theirs, on their schedule, and paying us more does not move that date. We find that out before the job is booked rather than on the day.
There is a fourth thing the utility decides that catches people: clearances. How far a meter has to sit from a window, a gas meter, a deck or a downspout is their rule, and it is why a meter occasionally has to move along the wall during an upgrade even though nothing was wrong with where it was. That move brings the conduit run with it.
The utility also wants the inspection release before it will reconnect, which is why steps seven and eight of the sequence above happen in that order and cannot be swapped. Which utility covers you depends on your address — a rural cooperative serves parts of this area, and Ontario, Nyssa and Vale sit on the Oregon side with their own utility and their own paperwork. We confirm which one it is before anything goes on the schedule, because the lead time is theirs and not ours to promise.
What does a panel upgrade cost?
There is no honest single number, and the reason is specific: two houses on the same street with the same figure stamped on the main breaker can be very different jobs, and nearly everything that separates them sits outside the panel.
- Whether the service size is actually changing, or the panel is being replaced at the size it already is
- Overhead or underground — and on underground, who does the digging and who puts the yard back
- Whether the meter stays put or has to move to satisfy the utility's clearance rules
- The condition of the mast, the weatherhead and the incoming conductors
- What the grounding and bonding need in order to meet current requirements, which on an older house can be most of the work
- Whether the existing branch conductors reach the terminals in the taller box or have to be extended
- Arc-fault and ground-fault protection on the circuits that require it as they are reconnected
- Interior or exterior mount, and what the wall behind the panel is made of
- Whether the last person who worked in the panel did it correctly
- Permit and inspection fees, which the permitting authority sets and we do not, and which sit on the estimate as their own line so you can see which part of the number is ours
So the number comes from a free on-site estimate instead of from the phone. An electrician reads the panel, runs the load calculation, tells you which of the three answers above your house is actually in — out of room, bad panel, or genuinely undersized — and writes one flat price for the job. Flat means it cannot climb while the house is dark: if the work turns out harder than it looked, that is ours to absorb, and the only thing that moves an approved number is extra scope you agree to first. You see it in writing before anything is opened up. More on why we won't quote a price over the phone.
If the capacity question came up because of something else you are planning, those pages carry their own detail: EV charger installation, generator installation and the transfer switch it needs, and electrical repair for when the problem turns out to be a circuit rather than the service.
The free estimate covers the whole area we work in. Idaho: Boise · Meridian · Nampa · Caldwell · Eagle · Star · Kuna · Middleton · Garden City · Hidden Springs · Mountain Home · Emmett · Marsing · Homedale · Parma · Wilder · Payette · Fruitland · Weiser
New Plymouth, Greenleaf, Melba and Midvale are places we work as well, and none of the four has a panel page of its own — call and we will tell you what the service at your address looks like before you buy the equipment that made you ask.
This work is done by American Electrical Services, which holds Idaho Electrical Contractor License LIC# 3671445 under its own name and runs its own electricians and its own phone line. The parent company behind it is American Rooter & Drain, a plumbing business in the greater Treasure Valley since 1945, reachable at (208) 366-5771. If the main breaker reads 100 and you are about to add something large, if one of the panel names above is on your wall, or if a home inspection put a vague sentence about your service in front of you, call (208) 782-8268 or request service online. There is more about the division at electrical services.
