Electrical Panel Upgrade in San Mateo, CA
100 to 200 amp service upgrades, breaker box replacement and subpanels for modern loads. Serving San Mateo and San Mateo County.
Open 24 hours, 7 days a week — flat price quoted before work starts
Service directory — San Mateo
MAIN 200AElectrical Panel Upgrade in San Mateo, CA
A lot of San Mateo houses are still running the panel they were built with, on a service sized for one window AC and a black-and-white television. Add an EV, a heat pump and an induction range and that panel is out of room and out of capacity.
Call (833) 652-8933 and describe what is happening. If it is a same-day job we will book it today, and if it needs a site visit to quote properly we will tell you that too.
| Typical service size | 200A residential, 400A for large homes and small commercial |
|---|---|
| Panel spaces gained | Commonly 20 to 42 breaker spaces after upgrade |
| Time on site | Most residential upgrades finish in one day |
| Included | Permit, utility disconnect coordination, inspection, grounding upgrade |
| Service area | San Mateo and San Mateo County, California |
What we cover
Electrical Panel Upgrade work we handle for San Mateo homes and businesses.
- Meter main combo and service entrance replacement
- AFCI and GFCI breaker upgrades
- Zinsco, Federal Pacific and Challenger panel replacement
- Fuse box to modern breaker panel conversion
- Main breaker and main lug panel replacement
- 100 amp to 200 amp service upgrades
- Subpanel installation for garages, shops and ADUs
- Grounding and bonding brought up to current code
Not sure which you need?
Describe the symptom and we will tell you what it usually means. Most callers get a straight answer in a couple of minutes, and about a third of the time it turns out to be smaller than they expected.
Situations we see in San Mateo
Adding an EV, heat pump or ADU
All of these need a load calculation. If existing demand plus the new load exceeds your service, the upgrade comes first.
Panel is rusted or wet
Water in an enclosure corrodes bus stabs and creates high-resistance connections. Once rust reaches the bus, the panel is done.
No space left in the panel
Double-tapped breakers and tandem cheaters are a sign the panel is full. A 200 amp replacement gives you 40 or more spaces and room for the next ten years.
Zinsco or Federal Pacific panel
These breakers have a documented history of failing to trip under fault. Replacement is the only real remedy, and it is one of our most common San Mateo jobs.
San Mateo coverage
Electrical Panel Upgrade across San Mateo and the towns around it.
Reviews from San Mateo County
Tesla Wall Connector in the garage, clean conduit run, done in an afternoon. They talked me out of a panel upgrade I didn't actually need.
Devon W.EV charger · San MateoOur restaurant lost the walk-in circuit on a Friday. They came out after close, traced it to a failed feeder lug, and we opened Saturday on time.
Ken A.Commercial repair · San MateoFlickering through the whole house turned out to be a loose neutral at the service. They found it in under an hour when two other companies had shrugged.
Bill T.Troubleshooting · San MateoElectrical Panel Upgrade in San Mateo — questions
How long will my power be off during the upgrade?
Plan on most of a working day. We coordinate the utility disconnect and reconnect so the outage lands in one block rather than spread over days.
Do I really need 200 amps?
If you are adding EV charging, electric heat, a hot tub or an ADU, almost certainly. We run an actual load calculation rather than guessing, and if 100 amps genuinely still works we will tell you.
How much does an electrical panel upgrade cost in San Mateo?
Cost tracks the service size, the condition of the service entrance and whether the meter has to move. A straight 100 to 200 amp swap sits well below a job that needs a new mast and underground feed. Call (833) 652-8933 and we will walk your panel and quote a flat number.
Do I need a permit for a panel upgrade in San Mateo?
Yes, service work is permitted and inspected. We pull the permit, schedule the inspection and meet the inspector so you don't have to.
Can you replace just the breakers instead of the whole panel?
Sometimes. On a sound modern panel, breaker replacement is fine. On a Zinsco, Federal Pacific or corroded enclosure, new breakers don't fix the bus, so the panel gets replaced.
Book panel upgrade in San Mateo
Call and speak to a dispatcher now, or send the details and we will come back with a time and a price.