Walnut Creek · Lafayette · Danville · Orinda
Electrical Panel Upgrades in Walnut Creek, CA
Most panel upgrades here move a 1960s or 1970s home from 100 amps to 200 amps. In the Bay Area that usually runs $3,000–$8,000+ with overhead service and $20,000+ when the service is underground (East Bay Electric, citing PG&E).
- Start with a load calculation: you may not need a bigger service
- PG&E steps and Walnut Creek permits explained
- Costs from named sources, not guesses
Start with the load
What are you adding?
Upgrades usually start with something new on the circuit. Pick the closest match.
- EV chargerA Level 2 chargerA 40 to 60 amp, 240-volt circuit, sized at 125% of the charger. Many 200A homes just need the circuit.EV charger installation
- Heat pump + inductionGoing all-electricReplacing a gas furnace, water heater and range adds the biggest loads. The load calculation is the first step.Check your load
- ADU or additionA second living spaceA new kitchen and heating system often means a subpanel and sometimes a larger service from PG&E.PG&E service steps
- Backup powerA generator or batteryA standby generator with an automatic transfer switch, or a battery for essential circuits.Generators & backup
- Old panelFederal Pacific or ZinscoPanels inspectors flag in 1960s and 1970s homes. Most owners replace and upgrade in one job.Old panel replacement
- Not sure yetJust planning aheadStart with what your panel and meter say today, then what you want to add over the next few years.Start here
Services
Every upgrade, slot by slot
Like the directory inside a panel door: each slot is one job, with the page that explains it.
Panel and service upgrades lead the list because most of the rest depend on them. An EV charger, heat pump or ADU only fits if the service can carry it, and a Federal Pacific or Zinsco replacement is the natural time to add capacity.
- 01Panel upgradeBigger main panel and service, usually 100A to 200A.200A
- 02PG&E service upgradeLoad assessment, design, advance, reconnection.Utility
- 03Load calculationWhether you need an upgrade at all.NEC 220
- 04EV chargerHardwired or 14-50 outlet, circuit sizing, permits.240V
- 05Generator & batteryStandby generators, transfer switches, batteries.Backup
- 06Federal Pacific & ZinscoReplacing panels inspectors flag.Replace
- 07Home rewiringAluminum branch wiring, two-prong outlets.1965–75
- 08Hiring an electricianC-10 license, permits, what a quote should list.C-10
Know the job
Panel upgrade, replacement or service upgrade?
Three different jobs that often get the same name. Which one you need decides who's involved and how long it takes.
| Job | What changes | Usually needed when | Who is involved |
|---|---|---|---|
| Panel replacement (same amps) | New panel and breakers; service size stays the same | The panel is obsolete (Federal Pacific, Zinsco), damaged, or out of breaker spaces | Electrician, city or County permit; PG&E disconnect and reconnect |
| Panel upgrade (more amps) | Larger panel and main breaker, e.g. 100A to 200A, with new service conductors | The load calculation exceeds your current service | Electrician, permit, PG&E load assessment |
| Service upgrade (utility side) | PG&E's drop, underground lateral or transformer | PG&E's equipment can't deliver the new service size | PG&E design and estimate; advance up to $5,000 (single-family) |
| Subpanel | Adds breaker spaces, not capacity | An ADU, detached garage or a full panel | Electrician and permit |
Most panel upgrades in Walnut Creek's 1970s neighborhoods (the city's median home was built in 1974, per Census data) are the second row, and many also involve the third.
Before you upgrade
Do you really need it?
Maybe not. A load calculation adds up what your home actually uses and what you plan to add, using the method in the electrical code. PG&E's own guide says you may be able to electrify without a panel upgrade, and that avoiding one could save thousands of dollars.
In the example below, a gas-heated 1,800 sq ft home calculates at about 40 amps today. Add an induction range, a Level 2 charger, a heat pump water heater and a heat pump and it lands near 105 amps, just over a 100A service. A smaller charger or a circuit-sharing device might keep it under. A second EV would not.
- Existing house loads
- Everything above the first 8 kVA, counted at 40% (includes the new range, EV charger and water heater)
- New heat pump, counted at 100%
Cost
What panel upgrades cost here
Bay Area figures from named sources. Your quote depends on the meter location, overhead or underground service, wall repair and PG&E's side.
The utility side
How PG&E fits in
When a bigger panel needs more power than PG&E delivers today, PG&E runs its own process alongside your electrician's.
The step that surprises people is the load assessment: PG&E says it can take up to 30 days. Ask any electrician you're considering who files the PG&E request and who tracks it.
- PG&E
Load assessment
PG&E checks whether its transformer, service drop or underground lateral can carry the new load.
- PG&E
Design and estimate
If PG&E equipment has to change, it designs the work and sends an estimate.
- You
Contract and advance
You sign PG&E's scope of work.
- PG&E
Utility-side work
PG&E does the work outside your home and handles permits for its own infrastructure.
- City or County
Panel install and inspection
Your electrician installs the new panel under your permit; the city or County inspects it.
- PG&E
Reconnect
PG&E disconnects and reconnects power, typically within one day.
Service area
Walnut Creek and nearby
Walnut Creek takes permit applications only through its online portal and reviews simple electrical permits in about 3–5 business days. Neighbors work with different permit offices and energy providers.
Hiring
Check any electrician before you sign
Panel, service, EV charger and generator work needs a permit, and that means a contractor with an active C-10 (Electrical) license from the Contractors State License Board. Look the license up at cslb.ca.gov, and ask who pulls the permit and who handles PG&E.
Panel upgrade questions
What is the average cost to upgrade an electrical panel here?
For a typical 100-amp to 200-amp upgrade with overhead service, Bay Area guidance is $3,000–$8,000+; when the service is underground it can reach $20,000+ (East Bay Electric, citing PG&E). Real quotes can come in below or above that. The cost guide breaks down what moves the number.
How much does it cost to go from 100 to 200 amps?
The same $3,000–$8,000+ overhead range applies to most 100A to 200A jobs. Underground service, a meter that has to move, stucco repair and any PG&E work on its side push it higher. PG&E may also ask for an advance of up to $5,000 for a single-family home, which it refunds or credits.
Is there a tax credit for a panel upgrade?
Not a federal one for new work. The IRS says the 25C home improvement credit is not allowed for property placed in service after December 31, 2025. See the rebates guide for what is still open as of October 2026.
How long does a panel upgrade take in Walnut Creek?
The paperwork usually takes longer than the install. Walnut Creek reviews simple permits like electrical work in about 3–5 business days, but only through its online portal. If PG&E has to assess its side, that alone can take up to 30 days. Once the work passes inspection, PG&E typically reconnects within a day.
Do I need a panel upgrade to add an EV charger or heat pump?
Often not. A load calculation decides it, and PG&E itself promotes ways to electrify without a panel upgrade, like circuit-sharing devices and smart panels. Start with Do I need a panel upgrade?
Sources
- East Bay Electric: Bay Area electrical panel upgrade cost (Sept. 2026)
- PG&E: Electrical panel upgrade process (PDF)
- PG&E: How to switch to electric appliances without a panel upgrade
- IRS: FAQs on 25C, 25D, 30C and other credits after Public Law 119-21
- City of Walnut Creek: Building permit FAQs
- Contra Costa County: Accela permit records
- CSLB: Check a license
- U.S. Census Bureau QuickFacts (ACS 2020–2024)
Next step
Get a quote for your panel upgrade
Call to talk it through, or send the short form. A local electrician can follow up to look at your panel and service and give you a written quote.
Call (925) 722-6103Prefer to type? Use the form.