Quick Answer: An electrical panel upgrade in San Jose, California costs $2,500-$5,000 to upgrade from a 100-amp to 200-amp service (the most common upgrade), including a new main breaker panel, permit, and all work by a licensed electrician. Upgrading from 100A to 400A for a large home or EV charging infrastructure costs $4,500-$8,000+. An electrical permit is required in San Jose for any panel replacement or service upgrade — PG&E must also approve and coordinate the service upgrade on the utility side. A 200A service is now the minimum required by California code for new construction and major remodels, and is recommended for homes with EV chargers, large HVAC systems, or home additions.
Electrical Panel Upgrade Cost — San Jose 2025
| Upgrade Type | Cost Range | Notes |
|---|---|---|
| 100A to 200A panel replacement | $2,500 – $5,000 | Most common; required for EV charger, large addition |
| 100A to 400A panel replacement | $4,500 – $8,000 | For large homes or solar+battery+EV |
| 200A to 400A upgrade | $3,000 – $6,000 | Usually for home additions or new ADUs |
| Sub-panel installation (100A, for addition/ADU) | $1,200 – $2,800 | Separate panel for new addition or detached ADU |
| FPE Stab-Lok / Zinsco panel replacement | $2,500 – $5,500 | Safety recall panels — should be replaced immediately |
| Permit fee (San Jose) | $300 – $800 | Always required; included in costs above |
Quartz Construction installs electrical panel upgrades and sub-panels as part of kitchen, bathroom, room addition, and ADU projects in San Jose. All work is permitted. CSLB #1003436 | Call (650) 749-7436.
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