Peter, Master Electrician at PRO Electric plus HVAC
Whether your panel needs to go, what the 2021 Virginia code adds to the job, what a 100 to 200 amp heavy-up actually includes, and why Fairfax, Loudoun, Arlington, and Prince William houses fail in different ways. This is the page I send people before we talk about a quote.
Call 703.225.8222 Get a panel quote- Licensed Master Electrician
- Virginia license 2705181607
- Fairfax, Loudoun, Arlington, Prince William
Quick answer
When does a Northern Virginia panel need to be replaced?
When it is a Federal Pacific, Zinsco, or Sylvania-Zinsco panel, a fuse box, or a split-bus panel with no single main; when the bus shows heat damage; when it is out of spaces and running tandem breakers; or when a 60 or 100 amp service cannot carry the house you live in now, which is most houses adding a heat pump, an induction range, or an EV charger. Condition and capacity decide it, and age by itself does not. And under the code Virginia has enforced since January 18, 2025, any service replacement brings an outdoor emergency disconnect and a surge protective device with it.
Stop and call now if your panel is doing any of these
These mean a connection is already hot. Turn off the main if you can reach it safely, leave the cover on, and call 703.225.8222 for 24/7 emergency electrical service.
Why panels that were fine for 40 years are failing now
Hi, I'm Peter, the Master Electrician at PRO Electric plus HVAC. A panel installed in 1968 in Annandale or Sterling Park was sized for the house it went into: gas heat, a window unit or two, a range, a dryer, and lights. The code minimum then was a 60 amp service for a small house with gas appliances, or 100 amps with electric heat. Most of those panels have never been replaced.
What's changed is the load. Central air or a heat pump pulling 20 to 30 amps at start, a second refrigerator, a microwave and a toaster oven on the same kitchen circuit, an induction range, a home office, a heated bathroom floor, and now a Level 2 EV charger on a dedicated 40 to 60 amp circuit. A single charger can be half of a 100 amp service on its own. The breakers trip because the panel is doing its job on a house it was never sized for, and the connections inside it have been heating and cooling through 50 summers.
The second thing that changed is the code. The 2020 National Electrical Code, which Virginia adopted through the 2021 Uniform Statewide Building Code, added two items to every service replacement: an outdoor emergency disconnect and a surge protective device at the service. So a heavy-up today is a different job from a heavy-up in 2020, and the quote should show it.
How to tell whether your panel needs replacing
Two lists, and they're different. The first is about condition, and any one item is a replacement. The second is about capacity, and it is decided by a load calculation, not by a feeling.
Replace on condition
- Federal Pacific Stab-Lok, Zinsco, or Sylvania-Zinsco. Documented breaker and bus failures. We replace them on sight, and the reasons are on our page about recognizing a failing panel before it fails.
- A fuse box. Not dangerous by design, but a 60 amp fuse box in 2026 is undersized, usually ungrounded in places, and often carrying oversized fuses someone installed to stop them blowing.
- A split-bus panel. No single main; up to 6 large breakers at the top act as the disconnect. Common before about 1980, and past its service life.
- Heat damage. Pitted or discolored bus stabs, melted breaker bases, scorching on the cover, or rust from a damp basement or a leaking meter base above it.
- Breakers you cannot buy. Pushmatic, General Switch, and some Challenger units have no current manufacturer and no listed replacements, which is the problem behind mismatched breakers in older panels.
Replace on capacity
- The service is 60 or 100 amps and the house has, or is getting, a heat pump, an electric range, an electric dryer, a tankless electric water heater, a hot tub, or an EV charger. A load calculation under the code decides it, and the county asks for that calculation on the permit.
- The panel is out of spaces and already full of tandem breakers, or a subpanel has been added to a service that was never big enough for the main panel alone.
- Breakers trip when 2 or 3 normal appliances run at once, and adding dedicated circuits would exceed what the service can carry. Our guide to breakers that keep tripping covers the difference between an overloaded circuit and an overloaded service.
- Lights dim across the house when the AC or dryer starts. That can be a loose service connection rather than capacity, and it is worth reading why lights flicker before assuming a bigger panel is the fix.
For the wider list of symptoms that point at wiring rather than the panel, see the signs your electrical system is failing. For a panel that is buzzing or hot today, skip the reading and call.
Panel types and brands: what is in a Northern Virginia basement
| What you have | Where it turns up | What I do with it |
|---|---|---|
| Main breaker panel, 100 to 200 amps | Everything built or upgraded since the 1980s | Keep it if the bus is sound and the capacity fits. Add circuits, a subpanel, or a surge device as needed |
| Main lug panel | Subpanels, and some older services fed from a separate disconnect | Fine as a subpanel. As service equipment, the 2021 code's outdoor disconnect rules apply on replacement |
| Subpanel | Garages, additions, finished basements, EV circuits | Common and useful. The question is whether the main service can feed it, which is a load calculation |
| Transfer switch or generator panel | Well and septic lots in Fairfax Station, Clifton, western Loudoun, southern Prince William | Tested with the generator or battery. See our page on standby and battery backup power |
| Fuse box | Pre-1965 houses in Arlington, Falls Church, Annandale, Leesburg, Manassas | Replace. Usually a full service change |
| Split-bus panel | 1960s and 1970s subdivisions across all 4 counties | Replace when anything triggers work at the service |
| Federal Pacific Stab-Lok | 1960s to 1980s tract housing everywhere in the region | Replace on sight |
| Zinsco and Sylvania-Zinsco | 1970s, often garden apartments and townhouses | Replace on sight |
| Challenger | 1980s and early 1990s Loudoun and Prince William subdivisions | Inspect the bus. Some units are sound; damaged ones get replaced |
| Pushmatic, General Switch | 1950s houses inside the Beltway | Replace when work is needed; no listed replacement parts |
On a new 200 amp panel, the lines I install are Square D QO, Eaton CH, and Siemens. Plug-on neutral construction matters more than the brand on the door, because it makes the AFCI and GFCI breakers the code now requires clean to install and easy to replace. Forty to 42 spaces is the practical minimum for a house that will keep adding loads. And whatever the brand, only breakers listed for that panel go in it; the reasons are on the mismatched breakers page.
What a 100 to 200 amp heavy-up includes now
A heavy-up is a service replacement, not a panel swap, and under the code Virginia enforces today it has 7 parts. If a quote you're comparing lists 3 of them, it's a quote for a job that fails inspection.
- New service entrance conductors and meter base. The old cable and socket were sized for the old service.
- The outdoor emergency disconnect. Virginia Residential Code Section E3601.8, from NEC 230.85, required on new service equipment. It sits between the meter and your panel, and the indoor panel stays where it is. Full explanation on our outdoor disconnect page, and the service itself is here.
- A whole home surge protective device. Section E3606.5, from NEC 230.67, required at the service on new and replaced equipment. What it does and does not do is on our surge protection page.
- The new panel and breakers. Sized for the service with room to grow, with AFCI and GFCI protection where the code requires it.
- Grounding and bonding brought to current code. Ground rods, the grounding electrode conductor, water pipe and gas bonding.
- Permit, inspection, and utility coordination. Dominion Energy or NOVEC pulls the meter and sets it again. In Prince William County the inspection is scheduled for the same day as the outage, which I cover in the Prince William permit guide; Fairfax County's process is in the Fairfax permit guide.
- A load calculation on the way in. It decides whether 200 amps is enough, or whether a large house with 2 AC units and 2 chargers needs a larger service. The county asks for it.
That is the scope of our panel repair and upgrade work. When only the breakers are the problem and the bus is sound, it is a smaller job, covered under circuit breaker replacement.
The code, stated precisely
Virginia is a statewide code state. The counties do not write their own electrical rules; they enforce the Virginia Uniform Statewide Building Code, and the current edition is the 2021 USBC, which incorporates the 2020 National Electrical Code. It took effect on January 18, 2024, with a one year transition, and every permit filed since January 18, 2025 is under it (Virginia DHCD, n.d.; Prince William County, n.d.). Fairfax County's summary of the 2021 changes lists both the emergency disconnect, Section E3601.8, and the service surge protective device, Section E3606.5 (Fairfax County Land Development Services, 2024).
Two things you may read elsewhere that do not apply in Virginia yet
The 2023 NEC added language putting the disconnect on or within sight of the dwelling and a separate clause about service equipment replacement. The 2026 NEC deletes 230.85 entirely and moves the requirement into 230.70. Neither edition is adopted in Virginia. Your inspector is holding the 2020 NEC as carried in the 2021 Virginia Residential Code, and that is what this page describes.
County by county: what fails, and where
The 4 counties were built in different decades by different builders, and the panels fail in patterns you can predict from the address. Each county block below links to the neighborhood pages where we describe the local housing in more detail.
Fairfax County
The widest range in the region. Inside the Beltway and along the first ring, Annandale, Springfield, Burke, Bailey's Crossroads, and the City of Fairfax went up in the 1950s through the 1970s with 60 and 100 amp services, and a lot of them still have the original panel. Federal Pacific was a common builder choice in the 1960s, Zinsco in the 1970s, and split-bus panels in both. Circuits were run thin: one 15 amp circuit for 2 bedrooms and a hall was normal. Homes from 1965 to 1973 can have aluminum branch wiring on top of that.
Farther out, Reston, Oakton, Chantilly, and Centreville from the 1980s and 1990s came with 150 or 200 amp panels that are sound but full, and the trigger there is usually a charger or a heat pump. Fairfax Station, Clifton, and Great Falls sit on wells, which puts a 240 volt pump on the service. The county asks for a load calculation with any permit that adds a large load, and a service upgrade includes the disconnect and the surge device. The specific failures we see are in common panel problems in Fairfax County homes.
Loudoun County
Newer on average, with two exceptions. Sterling Park was one of the county's first suburbs, built in the 1960s with 100 amp Federal Pacific panels, some fuse boxes, and aluminum branch wiring in the 1965 to 1975 homes. Leesburg's older streets, Waterford, Middleburg, and the farmhouses around Purcellville and Lovettsville can carry 60 amp services and, in a few cases, knob-and-tube feeding them.
The bulk of the county, Ashburn Farm, Broadlands, Brambleton, South Riding, and the Dulles corridor from the 1990s to the 2010s, came with 200 amp panels that are now full. A finished basement with a media room and a second refrigerator, an induction cooktop, a tankless water heater, and 2 EV chargers will use a 200 amp service, and a large house with 2 AC systems can need a larger one, with a subpanel for the chargers. Builder-grade breakers from around 2000 also fail more than they should, and a flaky circuit in a 2005 house is often a bad breaker rather than a bad panel. Western Loudoun adds well pumps, generators, and solar, each with its own disconnect and interlock requirements.
Arlington County
The oldest housing in the region. Lyon Village, Cherrydale, Westover, Waverly Hills, Arlington Forest, and the streets around Columbia Pike are 1930s to 1950s brick colonials and Cape Cods, and a share of them still run 60 amp services, cloth insulated wiring, and fuse boxes. Knob-and-tube turns up in the pre-1940 houses. Garden apartments from the 1940s and the 1965 to 1973 condo conversions can have aluminum branch wiring.
Along the Rosslyn to Ballston corridor and in Crystal City and Pentagon City, the panel is in a closet, the meter is in a stack in the basement, and the building owns the feeder. Capacity there is a building question as much as a unit question. The county's own housing stock is why most older Arlington homes are overloaded, and the panel is the reason.
Prince William County
Everything from historic Occoquan and Old Town Manassas to the 2010s subdivisions around Bristow and Gainesville. Dale City and the older parts of Woodbridge went up in the 1960s and 1970s with 100 amp panels, Federal Pacific among them, and a lot of townhouses there have since added a charger to a panel that was full before the car arrived; that story is in Woodbridge townhouses needing panel upgrades after EV chargers overload the service. Nokesville, Catharpin, and the southern county are large lots on wells and generators.
Two things are specific to this county. Manassas and Manassas Park are independent cities with their own permit offices, so a Manassas address can be a county permit or a city permit depending on the parcel. And the county runs its heavy-up inspection on the same day as the utility outage, with a morning call to the inspection branch; miss the call and the house stays dark overnight. Both are in the Prince William County permit guide. The county is split between Dominion Energy in the east and NOVEC across much of the west.
EV chargers and the panel: the question that starts most heavy-ups
A Level 2 charger takes a dedicated 240 volt circuit, commonly 40 to 60 amps. Whether your panel can take it is a load calculation, and I'll give you the honest shape of the answer before anyone runs the numbers. A 100 amp service with gas heat and gas cooking may have room. A 100 amp service with a heat pump, an electric range, and an electric dryer doesn't, and the choices are a 200 amp heavy-up or a charger with load management that slows charging when the house is busy. A 200 amp service in a large house with 2 AC systems and 2 chargers can need a larger service or a dedicated subpanel for the chargers.
Because the charger permit is what triggers the county's request for a load calculation, it is also what most often reveals that the service is undersized. The full walk through is in our EV charger installation guide, the shorter version is in home EV charging in Northern Virginia, and the service itself is EV charger installation.
What drives the cost, and what does not
I don't publish prices on this page, because the same 200 amp panel costs a different amount in a 1955 Arlington basement with a rusted meter base than in a 2005 Ashburn garage, and a number on a web page would be wrong for one of them. What I can tell you is what moves the price:
- Panel swap or service replacement. A new panel on a sound service is the smaller job. A heavy-up replaces the conductors, meter base, disconnect, and surge device too.
- Amperage. 200 amps is the standard. Larger services cost more in conductors, equipment, and utility work.
- Condition of what is there. A burned bus, a corroded meter base, aluminum feeders, or a grounding system that has to be rebuilt adds work.
- The 2021 code items. The outdoor disconnect and the surge protective device are part of every service replacement now, and they should be on the quote by name.
- Jurisdiction. Permit fees and inspection procedures differ across the 4 counties and the independent cities.
- Access and utility. A meter on the far side of a finished basement, or a utility that needs 2 weeks to schedule a disconnect, changes the day.
Two things that don't move it: the brand on the panel door, within the lines I install, and the idea that a bigger panel lowers your electric bill. It doesn't. A panel doesn't consume energy, and a bigger one doesn't consume less. What you buy is capacity and protection.
How a panel visit runs with us
- Read the label, every breaker face, and the wire gauges on the way in. Photograph it all for your records.
- Thermal scan of the panel, main lugs, and meter base under load. This is what finds the connection that is about to fail.
- Load calculation for the house you have and the loads you are planning, which is what the county wants on the permit anyway.
- A written quote that names the panel, the amperage, the disconnect, the surge device, the grounding work, and the permit, so you can compare it line by line.
- Permit filed with the right office, utility scheduled, inspection met. The house is without power for hours, not days.
- The closed permit and the passed inspection record handed to you at the end. That is what a buyer's inspector asks for.
That is panel repair and upgrade, with electrical inspections and safety assessments for the rest of the system, code correction when an inspector has already written it up, and home wiring when the panel is not the only thing from 1965. Veteran and military discounts apply, and financing is available on request.
Call 703.225.8222 Request a panel quoteQuestions I get about electrical panels in Northern Virginia
When should an electrical panel be replaced?
Replace it when any one of these is true: it is a Federal Pacific Stab-Lok, Zinsco, or Sylvania-Zinsco panel; it is a fuse box or a split-bus panel with no single main; the bus bar shows heat damage, rust, or pitting; it is out of spaces and already carrying tandem breakers; it is a 60 or 100 amp service that cannot pass a load calculation for the house you actually live in; or you are adding an EV charger, a heat pump, or a hot tub that the service cannot carry. Condition and capacity decide it, and age by itself does not.
How do you know if your electrical panel is bad?
Breakers that trip under normal use, breakers that will not reset or feel warm, a burning smell or buzzing at the panel, scorching on the cover or on breaker faces, lights that dim when the AC or dryer starts, and a panel that is warm to the touch with the cover on. Any of those with a Federal Pacific, Zinsco, or fuse box behind them is a replacement, not a repair. A thermal scan under load settles the rest.
How much does it cost to replace an electrical panel in Northern Virginia?
It depends on 5 things: the amperage you are moving to, whether the service entrance and meter base have to be replaced along with the panel, whether the job needs the outdoor emergency disconnect and the surge protective device the 2021 code now requires on new service equipment, the condition of the grounding and bonding, and which jurisdiction is issuing the permit. A like-for-like panel swap on a sound service is the low end. A 100 to 200 amp heavy-up with new conductors, meter base, disconnect, and surge device is the high end. We quote on the service we can see, in writing, before the work starts.
How much does it cost to upgrade from 100 amps to 200?
More than a panel swap, because a heavy-up is a service replacement, not a panel replacement. The utility conductors, the meter base, the service entrance cable, the panel, the grounding electrode system, and under the 2021 Virginia code the outdoor emergency disconnect and the surge protective device all change. The permit, the utility disconnect and reconnect, and a same day inspection are part of it. The price is driven by those items, and an in-person look at the service is the only honest way to set it.
Does upgrading the electrical panel save money on electricity?
No. A panel does not use energy and a bigger one does not use less. What an upgrade buys is capacity and safety: circuits that stop tripping, room for the loads you are adding, and protection that actually opens on a fault. If a company promises lower bills from a new panel, ask them to explain the physics. The exceptions are indirect: a heat pump or an induction range that an upgrade lets you install can lower your total energy cost compared with what it replaces.
What are the 4 types of electrical panels?
Main breaker panels, which have a single large breaker that shuts off everything and are the standard in a modern house; main lug panels, which have no main breaker and are fed from a disconnect or another panel, common as subpanels; subpanels, a second panel fed from the main to add circuits in a garage, addition, or basement; and transfer switches or generator panels, which move selected circuits between the utility and a generator or battery. Older homes add a fifth: the fuse box.
What is the best 200 amp electrical panel?
Square D QO, Eaton CH, and Siemens are the lines I install most, and all three are sound. What matters more than the name is plug-on neutral construction, which makes AFCI and GFCI breakers cleaner to install; enough spaces, with 40 or 42 being the practical minimum for a house that will add loads; copper bus if the budget allows; and a brand whose breakers are stocked locally so a replacement is a same day part. Federal Pacific, Zinsco, and anything with no current manufacturer are not candidates.
Is a Federal Pacific panel safe?
No. Federal Pacific Stab-Lok panels have a documented history of breakers that fail to trip on an overload and of breakers that appear off while still passing current. The Consumer Product Safety Commission investigated the breakers and closed the inquiry in 1983 without a recall and, by its own later statement, without a determination on their safety; independent testing since has found high failure-to-trip rates. They were installed across Northern Virginia from the 1960s into the 1980s, and we replace them on sight. The same applies to Zinsco and Sylvania-Zinsco panels.
What is a split-bus panel and why does it matter?
A panel with no single main breaker. Instead, a group of up to 6 large breakers at the top acts as the disconnect, and one of them feeds the lower section. They were common before about 1980. The code has required a single main disconnect for decades, and a split-bus panel of that age has usually reached the end of its bus and breaker life. It is a replacement when anything else triggers work at the service.
What does the new Virginia code add to a panel job?
Two items on new service equipment, including a heavy-up: an outdoor emergency disconnect in a readily accessible outdoor location, Virginia Residential Code Section E3601.8, and a surge protective device at the service, Section E3606.5. Both come from the 2020 National Electrical Code, which Virginia adopted through the 2021 Uniform Statewide Building Code, effective January 18, 2024 and mandatory on all permits since January 18, 2025. A quote that leaves them out is a job that fails inspection.
Can I put an EV charger on a 100 amp panel?
Sometimes, and it depends on a load calculation rather than a guess. A Level 2 charger takes a dedicated 240 volt circuit, commonly 40 to 60 amps. On a 100 amp service with gas heat and gas cooking there may be room. On a 100 amp service with a heat pump, an electric range, and an electric dryer there almost never is, and the answer is a 200 amp heavy-up or a charger with load management that throttles when the house is busy. The county will ask for the calculation on the permit.
How long does a panel replacement take?
A panel swap on a sound service is usually a day, with power off for part of it. A heavy-up is a day of work plus the utility's schedule for the disconnect and reconnect, which is the longest lead time on the job. In Prince William County the inspection is coordinated for the same day as the outage; Fairfax, Loudoun, and Arlington each have their own process, and we run all four.
Do I need a permit to replace an electrical panel?
Yes, in every Northern Virginia jurisdiction. A panel or service replacement is permitted and inspected work. We pull the permit, schedule the inspection, and meet the inspector. Unpermitted panel work is the item a buyer's home inspector finds first, and correcting it later costs more than permitting it now.
Are mismatched breakers in the panel a reason to replace it?
Not by themselves. Breakers that are not listed for the panel are a reason to replace the breakers with the right ones. The panel gets replaced when the bus stab behind a wrong breaker has been damaged by the loose connection, which is common once it has been in there a few years, or when the panel is a brand with no listed breakers available. We inspect the stab before deciding which job you have.
Which counties do you replace panels in?
Fairfax, Loudoun, Arlington, and Prince William Counties, plus the independent cities inside them: Falls Church, Fairfax City, Manassas, and Manassas Park. Each has its own permit office and we file with the right one. We dispatch from Falls Church and from Random Hills Road in Fairfax.
Does a panel upgrade require an outdoor disconnect even if the panel stays inside?
Yes, when the service equipment is replaced. The panel can stay in the basement or the garage. What the 2020 NEC as adopted in Virginia requires is a disconnecting means in a readily accessible outdoor location, so a heavy-up adds an outdoor disconnect between the meter and the indoor panel, and the indoor main stays where it is. Existing services that are not being replaced are not required to add one.
The rest of the panel series
This page is the overview. Each of these goes deeper on one question.
Fairfax, Arlington, Loudoun, and Prince William Counties
Get a written panel quote
Send a photo of the panel with the cover on and tell us what you are adding. A Master Electrician will tell you whether it is a breaker, a panel, or a service, and what the 2021 code adds. Or call 703.225.8222.
Hot panel, burning smell, or lights brightening? Tonight, not next week.
A loose service connection gets hotter every time the AC starts. Our emergency line answers 24 hours a day.
24/7 emergency electrical serviceSources
Code adoption and effective dates were checked against state and county pages in September 2026. Housing and panel patterns come from service work across the 4 counties.
- Virginia Department of Housing and Community Development. (n.d.). Codes. https://www.dhcd.virginia.gov/codes
- Fairfax County Land Development Services. (2024). Summary of code changes, 2021 Virginia USBC. https://www.fairfaxcounty.gov/landdevelopment/sites/landdevelopment/files/Assets/documents/24-02-summary-code-changes-2021-virginia-usbc.pdf
- Prince William County Building Development Division. (n.d.). Virginia Uniform Statewide Building Code. https://www.pwcva.gov/department/building-development-division/vusbc
- U.S. Consumer Product Safety Commission. (1983). Commission closes investigation of FPE circuit breakers and provides safety information for consumers. https://www.cpsc.gov/Newsroom/News-Releases/1983/Commission-Closes-Investigation-Of-FPE-Circuit-Breakers-And-Provides-Safety-Information-For-Consumers/
Condition and capacity decide it. We check both before we quote.
Licensed Master Electricians serving Fairfax, Loudoun, Arlington, and Prince William Counties. Load calculation first, written quote second, permit and inspection on every job. Veteran and military discounts available.
Call 703.225.8222 Contact usPRO Electric plus HVAC. Virginia Electrical and HVAC Contractor License 2705181607. 800 West Broad Street, Falls Church, VA 22040. 11325 Random Hills Road, Suite 360, Fairfax, VA 22030.