Sub Panel Installation services
- Garage and detached workshop sub panels
- ADU and guest house electrical panels
- Pool, spa and outdoor equipment panels
- Sub panels for home additions and remodels
- Underground and overhead feeder installation
- Trenching coordination for detached buildings
- Circuit relocation from a full main panel
- Load calculations and permit handling
Each sub panel project in California starts with a load calculation to confirm the main service can support the new panel. We then run a properly sized feeder, install the sub panel with its own breakers, bond and ground it correctly, and label everything. The result is a clean, expandable panel that passes inspection the first time.
We have installed sub panels for garages, ADUs and shops in California and neighboring Los Angeles, San Diego and San Jose. If your main panel is already full, we can also discuss whether a panel upgrade should be paired with the sub panel so you are not back at capacity next year.
A sub panel makes sense in California when
- You are building or converting an ADU or garage
- The main panel has no open breaker spaces
- You need several new circuits in one area
- You are adding a shop with 240-volt tools
- Pool or spa equipment needs its own feed
Frequently asked questions
How much does sub panel installation cost in California?
Cost depends on panel size, feeder length and whether trenching is needed. California customers receive a written flat quote after a site visit.
Do I need a permit for a sub panel in California?
Yes. Sub panels in California require a permit and inspection, which we include in the job.
Can a sub panel go in a detached garage?
Yes. Detached garage sub panels in California are common. We run an underground or overhead feeder and install a separate grounding electrode as code requires.