What does the inspector check on an electrical panel upgrade?

What happens at a service panel upgrade inspection?

An inspector from your building department looks at the new panel, its grounding, and the wiring connected to it before the service is put back into permanent use.

The inspector works for your city or county, not for your contractor, and that is the whole value of the permit. Depending on your jurisdiction and the job, there may be more than one visit. On a service change, ask your electrician how the utility reconnect gets coordinated with the inspection, so your power is not off longer than it has to be.

The rules the inspector enforces come from the 2025 California Electrical Code, which took effect January 1, 2026 and is based on the 2023 National Electrical Code. Newer editions add requirements that older panels were never built to, so a panel that was fine in 1985 is not the standard your new one gets held to.

What does the inspector actually look at on a new panel?

Grounding and bonding, wire and breaker sizing, clear working space, labeling, and basic workmanship.

Here is the plain-English version of what gets checked. Your electrician knows the code sections behind each one, and a good one will walk you through them if you ask.

• Grounding. The ground rods, the connection to a metal water pipe or the foundation steel where there is one, and the clamps holding it all together.
• Bonding. The connection that ties the neutral and ground together at the main panel, and only there. In any subpanel down the line, they have to stay separate.
• Wire and breaker sizing. The service wires have to match the panel rating, and every breaker has to match the wire it protects. The wire decides the breaker, never the other way around.
• Working space. Clear floor space in front of the panel, with enough width and headroom to work safely, and nothing stored in it.
• The circuit directory. Every breaker labeled with what it actually feeds, in words a stranger could use in the dark. "Kitchen" is weak. "Kitchen counter outlets, left of sink" is what you want.
• Workmanship. Unused openings closed, the cover fitting properly, one wire per breaker unless the breaker is made for two, and connections tightened the way the manufacturer specifies.

Why does my panel permit mean new smoke alarms?

Because in California any permitted alteration or repair requires the whole home to have smoke alarms that meet the new-construction standard.

This one catches people off guard, and it is not the inspector being difficult. Section R310.2.2 of the California Residential Code reads: "Where alterations, repairs or additions requiring a permit occur, the individual dwelling unit shall be equipped with smoke alarms located as required for new dwellings." Your panel permit is a permit, so it applies.

The good news is in Section R310.6. When the work is limited to plumbing, mechanical, or electrical and does not remove interior wall or ceiling finishes to expose the structure, battery-operated alarms are allowed instead of hardwired ones. On a straight panel swap, that usually means a trip to the hardware store, not an electrician's day rate. Put the alarms up before the final so they are not the reason you fail.

Carbon monoxide alarms work differently. Section R311.2.2 triggers new CO alarms when an addition is built or a fuel-burning appliance or fireplace is added, so a panel swap by itself is not one of the triggers. Separately, R311.2.1 already requires CO alarms in a home with a fuel-fired appliance, a fireplace, or an attached garage that opens into the house, permit or not.

How do I get ready for the panel inspection?

Clear the space in front of the panel, make sure someone can let the inspector in, check the circuit labels yourself, and have the smoke alarms up.

Most of what you control is access and housekeeping, and it matters more than people think. An inspector who cannot get to the panel cannot pass it.

• Move everything away from the panel: shelving, bikes, storage bins, the freezer.
• Confirm who will be home, and that dogs are put away and gates are unlocked.
• Walk the circuit directory yourself. If a label does not tell you what that breaker feeds, it will not tell the next person either.
• Have the smoke alarms installed where the new-construction standard puts them: each bedroom, outside each sleeping area, and on each story.
• Ask your electrician whether they will be there or on the phone, and who handles any corrections.

How does a panel permit work in Vacaville?

Vacaville issues like-for-like service and subpanel change-outs under 200 amps as an express permit online, while 200 amps and up goes through regular review.

The City of Vacaville Building Division runs permits through its online portal, eTRAKiT, and lists electrical service and subpanel change-outs under 200 amps as a basic residential replacement. When nothing new is being added, the city says those permits can be issued instantly. A service upgrade of 200 amps or more is not eligible for that express route.

Contractors need their own contractor login to apply, and the city does not let them apply under a public user account. If your electrician asks you to pull the permit yourself as the homeowner, ask why. The permit holder is the one on the hook for the work.

The Building Division is at 650 Merchant Street, Vacaville, and the number is (707) 449-5152. The city lists (707) 317-1070 as its inspection line. If your address is outside Vacaville city limits in unincorporated Solano County, your permit comes from the county instead.

This is general information, not legal advice. Local rules can be stricter than the state code, and your building department has the final say. Verified against the 2025 California Residential Code Sections R310 and R311, the 2025 California Electrical Code edition information, and the City of Vacaville Building Division's permit pages as of September 29, 2026.