100–200 amp panel upgrades & breaker box replacement in Mill Valley, Marin County. Local electricians, upfront pricing and fast scheduling.
(833) 652-8933 Request a quoteOlder homes in Mill Valley were wired for a different era. Add an EV charger, a heat pump, an induction range or an ADU and a 100 amp panel runs out of room fast. Phasethree Electric handles electrical panel upgrades in Mill Valley from permit to final inspection, including 100 amp to 200 amp service upgrades, breaker box replacement, fuse box replacement and sub panel installation.
Breakers that trip when two appliances run, warm or buzzing panel covers, a fuse box instead of breakers, no open slots, rust or scorch marks, or a brand with a known failure history such as Federal Pacific, Zinsco or Sylvania. Insurance carriers and buyers in Marin County often flag these panels during a sale.
New main breaker panel, new grounding and bonding to current code, labeled circuits, meter socket and service entrance work coordinated with the utility, permit and city inspection. Where you want to keep the existing panel we can add a sub panel for a garage, workshop, ADU or EV charger.
Cost depends on amperage, whether the meter and service entrance need replacing, and how the utility feeds the property. We give a fixed written price after a short on-site evaluation. Call (833) 652-8933 to schedule one in Mill Valley or nearby Corte Madera, Larkspur, Sausalito, Belvedere Tiburon.
We provide electrical panel upgrade throughout Mill Valley and the surrounding communities of Marin County.
Most residential panel replacements are completed in a single day, with power off for roughly four to eight hours.
Yes. Panel replacements in Mill Valley require an electrical permit and inspection. We pull the permit and meet the inspector.
For nearly every home in Mill Valley, yes. 200 amp service comfortably supports a Level 2 EV charger, solar back-feed, heat pump and a modern kitchen.
“Our restaurant lost power on a Friday night. They had the failed contactor replaced and the walk-in back up before we lost any product.”
Angela M.“Our breaker kept tripping every evening. The electrician found a bad neutral in about twenty minutes and had it fixed before dinner. Fair price, no upsell.”
Maria G.“Tesla Wall Connector installed in the garage in a couple hours. Clean conduit run, app set up, and they showed me how to schedule off-peak charging.”
Samantha L.Upfront pricing · Same-day service · 24/7 emergency response