Does Your Sonoma Remodel Need an Electrician From Day One?

Most remodels in Sonoma involve more wiring than homeowners expect. Moving a sink, adding an induction range or opening a dark 1950s den into a kitchen all change circuit layouts, electrical load and lighting. Every one of those changes is now checked against the 2025 California Electrical Code, which took effect on January 1, 2026 and adopts the 2023 National Electrical Code with state amendments. The electrical scope is usually settled well before cabinets arrive, and the order of that work affects the budget more than any finish choice.

That sequencing is why a dedicated electrical contractor belongs on the job early. Anderholm Electric, based in Rohnert Park and working across Sonoma and Marin counties, joins projects run by a Sonoma remodeling contractor to handle the work that lives behind the walls. That includes replacing Zinsco, Sylvania and Federal Pacific panels, installing SPAN smart panels, service upgrades, knob and tube removal and new lighting. Bringing them in before plans go to the city keeps the electrical design and the construction schedule aligned.

Reading the House Before Anything Is Drawn

Sonoma’s housing stock spans more than a century. Older homes near the Plaza can still have original knob and tube runs in the attic. Postwar ranch houses across the valley often have 60 or 100 amp service and a panel brand that inspectors and insurers now question. The first site visit is therefore an investigation, not a sales call, and it usually follows a set order:

1. The electrician opens the panel and records the brand, bus rating, main breaker size and how many spaces are left. Federal Pacific Stab-Lok and Zinsco equipment get flagged right away because of their widely reported history of breakers that fail to trip under overload.
2. A sample of circuits in the rooms being remodeled is traced to find ungrounded two-wire cable, brittle cloth insulation, and live knob and tube splices hidden in crawlspaces.
3. The meter, service drop and grounding electrode are checked to see whether a service change would need PG&E involvement. Utility scheduling alone can add weeks to a project.
4. The homeowner is asked for twelve months of utility usage data, which drives the next step.

Doing the Load Math Honestly

Older remodels often defaulted to an automatic 200 amp upgrade. The current code allows a more precise approach. For an existing dwelling, NEC section 220.87 lets the electrician use the actual peak demand from a year of metering as the starting point, then add the new loads. Typical additions include an induction range on a 40 or 50 amp circuit, a heat pump water heater, a heat pump replacing a gas furnace, and possibly a Level 2 EV charger.

The result usually leads to one of three outcomes. Some houses have enough capacity and only need a new panel with more spaces. Others need a full service upgrade. A growing number fall in between, where a smart panel or energy management system can shed or schedule loads so the existing service stays within its rating. The 2023 NEC explicitly recognizes these systems in load calculations, which is a major reason SPAN-style panels have moved from novelty to practical design option. This decision has to be made before framing, because it determines where the panel goes and how large the feeders must be.

Turning the Design Into a Permit Set

Once the load question is settled, the electrical plan becomes part of the permit drawings. In the city, that set goes to the Sonoma Building Division at City Hall, which reviews building, electrical and energy compliance together. The electrical portion usually includes:

1. A panel schedule, plus a single-line diagram if the service size or panel location changes.
2. A lighting plan that meets Title 24, Part 6. The California Energy Commission’s 2025 Building Energy Efficiency Standards require high-efficacy light sources in residential alterations. They also require vacancy sensors in spaces such as bathrooms, laundry rooms and garages, and IC-rated, airtight recessed fixtures wherever cans go into an insulated ceiling.
3. Notes on circuits added for future equipment. A dedicated EV circuit or a transfer switch location costs far less to plan now than to retrofit after the drywall is finished.

The coordination with the remodeler is most important at this stage. Moving a wall a few inches can push a receptacle outside required spacing or put a switch behind a door swing. A shared plan review catches those conflicts while they are still lines on paper.

Rough-In While the Walls Are Open

Rough-in begins after demolition and framing and before insulation. This is when the 2023 code changes become physical work. GFCI protection now covers every receptacle in a dwelling kitchen, not just those serving countertops. Branch circuits that are modified or extended generally need AFCI protection. Any knob and tube in an opened wall is removed and replaced with grounded cable rather than spliced into.

Many Sonoma homeowners also use this point to prepare for outages. After repeated public safety power shutoffs and wildfire seasons in the county, adding an inlet, a critical loads subpanel or wiring for a battery system during rough-in costs much less than doing it later. Once rough-in is complete, the inspection is requested through the city’s online permit portal. The insulation crew does not start until that inspection passes.

Finish, Final and the Handoff

After drywall and paint, the electrician returns to set devices, hang fixtures, program dimmers and sensors, and complete a clearly labeled panel directory. A labeled directory is a small detail that saves the next electrician an hour of guesswork. Title 24 compliance forms are collected, any required field verification is completed, and the final inspection closes the electrical permit with the rest of the project.

What the homeowner receives at the end is often overlooked: a current panel schedule, documentation of the new load calculation, and a record of what was replaced. That paperwork is useful when selling the house, adding solar later or answering an insurer’s questions about the old panel. A remodel goes smoothly when the electrical work follows this order, and costs rise mostly when steps are skipped, combined or started after the walls are already closed.