Electrical · Service

Electrical panel upgrade, starting with whether you need one

Most pages about panel upgrades are published by someone who sells them. This one starts with the load calculation that tells you whether your existing panel is actually short of capacity — and quite often, it is not.

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In short

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.

Triggers

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 →

The job

How panel upgrade actually works

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 for: A 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.
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 for: A 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.
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 for: Breakers 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.
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 for: An 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.
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 for: Grounding 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.
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 for: No 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.
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 for: A 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.

Money

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 →

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

Straight answer

When panel upgrade is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

Your load calculation comes back well under your existing service. This is the most common honest answer and the one nobody ranking for this term will give you. A 100-amp service in a gas-heated house with a gas range and no EV is frequently fine, and will stay fine. Get the number before you get the quote.
The real problem is one overloaded circuit, not the whole service. If the kitchen breaker trips when the microwave and kettle run together, the fix is usually a dedicated circuit for a few hundred dollars — not a new panel for a few thousand.
You are out of breaker spaces but not out of amps. Where the service size is genuinely adequate, a subpanel can add spaces for far less than replacing the main panel. It divides existing capacity rather than creating any, so it only works when the capacity is already there.
A free "panel safety inspection" from a company that sells panels found the problem. A solar installer needs your panel upgraded to sell you an array. An EV charger company needs it to sell you a charger. That does not make them wrong — it makes them a party to the transaction. Get a second opinion from someone with no product attached.
You are selling within a year or two. A panel upgrade is rarely recovered in sale price, and buyers do not shop on amperage. The exception is a panel with a documented defect history or a failed inspection, where the alternative is a price reduction anyway.
Your panel is simply old but sound. Age alone is not a fault. A clean, correctly sized panel of a reputable make with no heat damage, no double-tapped breakers and room to spare does not need replacing because it has a date on it.

Your options

Types of panel upgrade

200 amp service upgrade

When the utility service itself has to be replaced, not just the box.

Subpanel instead

More breaker spaces without touching the main service.

200 amp vs 100 amp service

What each service size realistically supports.

Compare electrical options side by side →

Before you sign

What to check when hiring for panel upgrade

Will you do a load calculation, and will you give me a copy?

The single most important question here. It is the difference between a recommendation and a pitch, and it costs the electrician half an hour.
Is this a panel upgrade or a service upgrade — and what exactly is included?

Meter, service conductors, mast and weather head either are in the quote or they are not. This is where a $3,000 job becomes a $12,000 one after work starts.
How many spare breaker spaces will I have when you are finished?

Capacity and spaces are separate constraints. A full panel at 200 amps is a problem you will pay to solve twice.
Who pulls the permit, and is the inspection fee in this price?

Both should be the electrician's job. A quote that is cheap because it skips the permit is not cheap.
Does the quote include arc-fault and ground-fault breakers where they are now required?

These cost several times what a standard breaker costs, and leaving them out is an easy way to make a quote look competitive.
How long will my power be off, and on what day?

A straight answer is a sign of a crew that has done this before. A vague one usually means nothing has been booked.
Will every breaker be traced and labelled, or copied from the old directory?

Old panel directories are wrong in most houses. Tracing takes time, which is why it gets skipped.

All electrical hiring checklists →

Local pros

Panel Upgrade near you

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Related work

Often done at the same time

200 Amp Service Upgrade

The physical service upgrade and the utility's part

Subpanel Installation

Spaces without a new main panel

Whole House Rewire

When the branch wiring is the problem

Electrical Inspection

Get the panel assessed independently

All electrical services →

FAQ

Panel Upgrade — questions people ask

Still have a question? Talk to our team →

How do I know whether 100 amps is actually enough for my house?

By having a load calculation done. It adds your lighting and general receptacle load, then your large appliances — range, dryer, water heater, HVAC, EV charger — with the demand factors code allows, and produces a number in amps. If that number sits comfortably under 100, your service is adequate and adding a bigger panel changes nothing about how your house behaves. Gas heat, a gas range and no EV is the classic profile that passes.

What is the difference between a panel upgrade and a service upgrade?

A panel upgrade replaces the breaker box. A service upgrade replaces the incoming electrical service — the utility conductors, the meter and the service entrance — and requires the utility to be involved and scheduled. The second is a much bigger job with an outage, a utility appointment and an inspection before reconnection. Many quotes use "200 amp upgrade" for both, so ask which one you are being sold.

How long does a panel upgrade take?

A panel-only swap is usually a single working day, with the power off for most of it. If the service, meter or mast has to be replaced as well, it becomes a multi-party job scheduled around the utility, and the calendar time is often measured in weeks even though the on-site work is a day or two. Utility coordination, not electrical work, is what makes these jobs slow.

Do I need a permit for a panel upgrade?

In almost every jurisdiction, yes, and an inspection follows it. The electrician normally pulls the permit. In many places the utility will not re-energise the service until the inspection has passed. Fees and exact requirements vary considerably between cities and counties, so confirm the specifics where you live rather than relying on a national answer.

Will a panel upgrade fix my flickering lights or my tripping breakers?

Sometimes, but not usually. A breaker that trips repeatedly is most often telling you that one circuit is overloaded or faulty — which a dedicated circuit or a repair fixes far more cheaply. Flickering can come from a loose connection, a failing main breaker, or a utility-side problem. A new panel only solves these when the panel or the service is genuinely the fault. Diagnose first.

Are there tax credits or rebates for a panel upgrade?

There have been, particularly where the panel upgrade is done alongside qualifying efficiency work such as a heat pump or a heat-pump water heater, and some states and utilities run additional programmes. Eligibility rules, caps and deadlines change, and some require pre-approval or specific equipment. Confirm the current position with the programme administrator before you count on it, not with the contractor bidding the job.