Panel & Breaker Issues

Federal Pacific Stab-Lok. Widely reported to fail to trip under fault conditions. Insurers and inspectors treat these as a defect on sight, regardless of age or condition.

Zinsco / Sylvania-Zinsco. Bus bars that overheat where the breaker clips on. The classic symptom is a breaker that will not reset because the bus behind it has melted enough to lose contact.

Fuse boxes still in service. Common in the older parts of Willow Glen, Naglee Park and the Rose Garden. A 60-amp fused service is not a hazard by itself, but it caps everything you might want to add, and the branch circuits behind it usually have no equipment ground.

If your panel is one of these, that is a finding a photograph can deliver in a minute — the label inside the door is enough.

An EV charger, a heat pump, an induction range, a hot tub or an ADU all ask the same question: what is left. A 100-amp service with a full panel means the answer is a service upgrade, a subpanel, a load calculation or a load-management device — four different prices for the same sentence "I want to charge a car at home". A load calculation is the piece homeowners skip and shouldn't: the number of empty spaces in the panel is not the same as the capacity of the service feeding it.

An electrical permit and an inspection are required to upgrade a home's main service panel — and the city states plainly that no plans are required for a residential panel upgrade, which keeps it a permit rather than a project on paper. A Level 2 EV charger installation is permitted work as well; a Level 1 charger plugged into an existing outlet is not, unless you are adding the outlet. Permits and inspections are handled through the city's online permit service, and the Permit Center answers on 408-535-3555. Addresses in the unincorporated county islands go to the County of Santa Clara instead — see the service-area page.

This is the item where local quotes diverge most, and it is worth understanding why before reading any single number. Published figures for San Jose and the surrounding county run from roughly $2,500–$4,000 for a straightforward panel replacement in a Bay Area home, through $7,000–$9,000 for a 100-to-200-amp service upgrade quoted by Santa Clara County shops, up to $8,000–$15,000 when the meter moves or the service comes in underground and trenching enters the picture. National breakdowns of the same job — panel, breakers, eight to ten hours of labor, permit and inspection — land at $1,800–$4,500, which is a good illustration of how much of the local number is the region rather than the work.

What moves you along that scale: whether the meter stays where it is, overhead versus underground service, whether the utility has to be involved in a disconnect and reconnect, whether the panel is on a wall that is still where the code wants it, and whether the branch circuits landing in the new panel need work before they can land in it.

If the panel finding is really a wiring finding — knob-and-tube, aluminum branch circuits, no ground anywhere — the numbers change shape. California whole-house rewiring is commonly quoted at $4–$8 per square foot; San Jose shops publish $18,000–$26,000 for 1,500–2,000 square feet and more above that, and knob-and-tube replacement is quoted nationally at $12,000–$36,600. Drywall repair and paint afterwards are somebody else's invoice, and they are not small.

The panel with the door open; the label inside the door, close enough to read the make and the amperage; the meter outside; and, if you are asking a capacity question, a note of what you want to add and the amperage on its nameplate.