Most Orange County homes built before the 1990s were given a 100 amp electrical service, and at the time that was generous. The house had a stove, a water heater, a furnace, and lighting. It did not have central air conditioning, an induction range, a heat pump, a pool pump, and a car that plugs in overnight.
A 100 to 200 amp panel upgrade doubles the electrical capacity coming into your home. It is the most common upgrade we do, and for a lot of Orange County houses it is the difference between an electrical system that is merely adequate and one that actually fits how the house is used.
Here is what the upgrade costs, how to tell whether you need it, and what the process looks like from the first call to the final inspection. Our step by step guide to electrical panel replacement covers the underlying process.
What a Service Upgrade Actually Changes
There is a distinction worth getting straight, because the two jobs sound similar and cost differently.
A panel replacement swaps the panel while keeping the same service capacity. A 100 amp panel comes out, a new 100 amp panel goes in. This is what you do when the panel is unsafe or obsolete but the capacity still suits the home, which is common with Federal Pacific and Zinsco panels.
A service upgrade increases the amperage coming into the house. It replaces the panel, and also the service entrance conductors, the meter socket, and often the riser and weather head. This is what you do when the house needs more power than the service can deliver.
The second job involves more equipment and more utility coordination, which is why it takes longer to schedule and costs more. Most homeowners asking about a 100 to 200 amp upgrade need the second one.
Signs Your Home Has Outgrown 100 Amps
Some of these are obvious. Some are easy to live with for years without connecting them to the panel.
- Breakers trip when several large appliances run together. The dryer and the air conditioning at the same time, for example.
- Lights dim briefly when the AC compressor or a well pump starts.
- Your panel is full. Every slot occupied, with no space for another circuit.
- Tandem or double-stuffed breakers have been used to squeeze extra circuits into a full panel.
- You are adding a major load. An EV charger, a heat pump, a pool, a workshop, a kitchen remodel with an induction range, or an ADU.
- Extension cords have become permanent fixtures because there are not enough circuits where you need them.
The last one is worth taking seriously. Running a space heater or a window unit off an extension cord long term is a workaround for a capacity problem, and it is a worse solution than it looks.
If you are adding an EV charger specifically, capacity is usually the deciding factor. A Level 2 charger draws a substantial continuous load, and on a 100 amp service with a full panel there is frequently nowhere to put it. A load calculation will tell you whether your existing electrical service can take it or whether the upgrade has to come first.
What a 100 to 200 Amp Upgrade Costs in Orange County
A 100 amp to 200 amp main meter panel upgrade generally runs $3,000 to $5,500. A typical 200 amp panel job lands around $4,000 to $4,500 or more. City permits add roughly $50 to $250 depending on where you live.
Actual pricing depends on multiple factors including panel age, circuit count, stucco or siding repair needs, permit requirements, overhead versus underground service, and site-specific conditions. A free inspection is the only way to get an accurate figure for your home.
The factors that actually move the number:
Number of circuits. More circuits means more time transferring and terminating them.
Stucco or wood siding repair. Removing a panel that has been in a stucco wall for forty years leaves a hole. Repairing and matching stucco is real work, and it is a common reason two quotes on the same street differ.
Permit complexity. Orange County cities do not run identical processes. Some are quick, others require more documentation and longer review.
Panel location and accessibility. A panel in an open garage wall is a different job from one behind shelving in a tight side yard.
Overhead versus underground feed. Overhead service costs more, because it involves replacing the riser, the weather head, and the service wires in addition to the panel and meter.
Grounding requirements. Homes from the era that still have 100 amp service often predate current grounding standards, so bringing the grounding electrode system up to code is frequently part of the job.
Our full cost guide covers the wider picture. If a quote comes in noticeably below this range, it is worth asking specifically what it includes. Permits, stucco repair, and grounding are the three things most often left out of a low number.
How the Process Works
1. Load calculation and assessment. An electrician looks at the existing electrical panel, the service, and what you are running now or planning to add. The load calculation is what establishes whether 200 amps is the right target. Occasionally the answer is that 100 amps is genuinely sufficient and the panel simply needs replacing, which is a cheaper job.
2. Permit. Pulled with your city, and requirements vary across Orange County.
3. SCE coordination. This is the part that governs the calendar. Southern California Edison has to approve and perform the service change, and their typical timeline runs around 90 days. Homes in SDG&E territory should expect longer, commonly three to six months for approval.
That timeline surprises people, so plan around it. If you are upgrading because an EV is arriving or a remodel is scheduled, start the process well before the deadline.
4. Installation. The panel, meter socket, service conductors, and grounding are replaced. Circuits are transferred to the new panel and labeled properly. On most single-family homes this is a one-day job with the power off during the work.
5. Inspection. The city inspects before the permit closes, and the utility completes the reconnect.
Is 200 Amps the Right Number?
For most Orange County single-family homes, yes. It comfortably supports central air conditioning, electric cooking, a heat pump, and vehicle charging with room left over, and it is the standard for new construction.
Larger homes, properties with substantial workshop loads, or houses planning both an ADU and vehicle charging sometimes justify more. That is what the load calculation determines. Going larger than the calculation supports adds cost without adding usable benefit, so it is worth sizing on the numbers rather than on instinct.
There is also a practical argument for doing the upgrade once. If your panel needs replacing anyway on safety or age grounds, and you expect to add an EV charger or electrify heating within a few years, doing the service upgrade at the same time avoids paying for the panel work twice.
What Happens to the Meter Base
The meter base, sometimes called the meter socket, is the enclosure the utility meter plugs into. It is rated for a specific service size, and this is the piece homeowners most often do not realise is part of the job.
A 100 amp meter base cannot carry a 200 amp service. On a 100 to 200 amp panel upgrade the meter base is replaced along with the electrical panel, the service entrance conductors, and on overhead services the riser and weather head as well.
This is the main reason a service upgrade costs more than a straight electrical panel replacement. A panel replacement touches the panel. A service upgrade touches everything from the utility connection inward.
It is also why Southern California Edison has to be involved. The meter is their equipment, so the work is scheduled around their disconnect and reconnect rather than purely around your calendar.
In many Orange County homes the panel and meter base are combined into a single enclosure, usually called a main meter panel. Where that is the case the whole assembly comes off the wall together, which is a cleaner job than it sounds and is the configuration most single-family homes here have.
Circuit Breakers in a New 200 Amp Panel
A new 200 amp panel is not just a bigger box. The circuit breakers themselves are different in ways that matter.
More spaces. A typical 200 amp panel offers considerably more breaker positions than the 100 amp panel it replaces, which is what ends the tandem breaker workarounds and leaves room for future circuits.
Modern breaker types. Current code requires arc fault and ground fault protection on many residential circuits. AFCI breakers detect the kind of arcing that starts fires in walls, and GFCI protection covers wet locations. Panels from the era being replaced usually have neither, so the upgrade adds a layer of protection that did not previously exist anywhere in the house.
Properly sized breakers. During the transfer every circuit gets a breaker matched to the wire it protects. In older panels it is common to find a circuit that has been given an oversized breaker at some point, which defeats the protection entirely. Those get corrected as part of the work.
Accurate labeling. Minor, but genuinely useful. Most homeowners have never had a correctly labeled panel.
The result is that a 100 to 200 amp panel upgrade delivers more than capacity. The electrical panel you end up with protects the home in ways the old one could not, regardless of how much power you actually draw.
Common Questions
How long does a 100 to 200 amp upgrade take?
The installation is typically a single day. The scheduling is the longer part, because SCE approval commonly takes around 90 days.
Will my power be off?
Yes, for the working day. Most homeowners arrange to be out of the house and have power restored the same afternoon.
Do I need a permit?
Yes. Service upgrades require a permit and a city inspection. Anyone offering to do this without one is not doing you a favor.
Can I upgrade to 200 amps without replacing the meter?
No. The meter socket and service entrance conductors are rated for the service size, so they are replaced as part of the upgrade.
Do I need 200 amps just to install an EV charger?
Not always. It depends on your current load and what is already on the panel. A load calculation answers it properly, and sometimes the existing electrical service has the headroom.
Is a subpanel an alternative?
Sometimes. If the main service has capacity but the panel is out of physical space, a subpanel can be the right answer and costs less, generally $1,300 to $2,700. If the service itself is maxed out, a subpanel does not help, because it does not add capacity.
Find Out What Your Home Needs
The only way to know whether you need a service upgrade, a panel replacement, or a subpanel is a load calculation based on your actual electrical system and how you use it. All three are different jobs at different prices, and guessing tends to cost more than asking.
The Tradesman Electric is a C-10 licensed electrical contractor specializing in panel replacement and service upgrades across Orange County. If your existing panel has the capacity you need, we will tell you that.
Get your free estimate. Call 949-528-4776. Honest assessment, no obligation, and a clear answer about what your home actually requires.