A sub-panel extends your main electrical service to a detached structure (garage, ADU, workshop, casita) or adds capacity to a room that needs many circuits (home theater, kitchen, server room). Aerosphere installs 60A to 200A sub-panels across Orange County with full permits, grounding, and city inspection.
Services We Provide
Garage Sub-Panel
Dedicated sub-panel for detached garages. Powers EV chargers, workshop tools, lighting, and 240V circuits without overloading the main panel.
ADU / Casita Sub-Panel
Code-compliant sub-panel for accessory dwelling units. Separate metering option available for rental ADUs.
Workshop / Shop Sub-Panel
Heavy-duty sub-panels (125A-200A) for woodworking, metalworking, or commercial workshops. Includes 240V circuits for tools.
Outdoor Equipment Sub-Panel
Pool equipment sub-panels (pumps, heaters, lights, spa), landscape lighting sub-panels, outdoor kitchen sub-panels.
Server Room / Home Office Sub-Panel
Dedicated sub-panel for home offices or server rooms requiring isolated grounding and UPS backup integration.
Solar + Battery Sub-Panel
Critical-loads sub-panel for solar + battery (Tesla Powerwall, Enphase) installations. Powers essential circuits during outages.
2026 Pricing in Orange County
| Service | Typical Cost | Notes |
|---|---|---|
| 60A sub-panel (small workshop or garage) | $1,200 – $2,200 | Single 240V appliance support |
| 100A sub-panel (typical ADU or full garage) | $1,800 – $3,200 | Most common install |
| 125A sub-panel (workshop or large ADU) | $2,400 – $4,000 | Heavier load capacity |
| 200A sub-panel (commercial workshop or large home addition) | $3,200 – $5,500 | Maximum residential |
| Outdoor weather-rated sub-panel (NEMA 3R) | +$200 – $500 | Weatherproof enclosure |
| Buried conduit run (per 50 ft) | $650 – $1,500 | Concrete cut + trench |
| Permit + city inspection | Included | Title 24 compliance |
Why Orange County Homeowners Choose Aerosphere
- C10 + C20 licensed — Both electrical and HVAC contractor licenses (CSLB #1108650).
- Same-day response — Most calls dispatched same-day across Orange County.
- Free written estimates — No hidden fees, no high-pressure sales.
- Permits handled — We pull all required permits and coordinate city inspections.
- Full warranty — Parts and labor warranty on every job.
- Licensed and insured — General liability and workers comp.
Get a Free On-Site Estimate
Aerosphere Electric provides free written estimates across Orange County. Same-day response on emergency calls.
Call 714-499-6656Frequently Asked Questions
How much does a sub-panel cost in Orange County?
A typical 100A sub-panel installation runs $1,800-$3,200 including permit, conduit, breakers, and inspection. 60A sub-panels (small workshops) run $1,200-$2,200. 200A sub-panels for larger ADUs or workshops run $3,200-$5,500. Buried conduit runs add $650-$1,500 per 50 feet.
Do I need a sub-panel for my ADU?
Yes — California building code requires every ADU to have its own electrical sub-panel separate from the main house panel. The sub-panel can either share the main service (sub-panel feed from main) or have a separate utility service drop with separate metering.
What size sub-panel do I need?
It depends on the load. Small workshops with hand tools: 60A sufficient. Garages with EV charger + workshop tools: 100A minimum. ADUs with kitchen, AC, EV charger: 100-125A. Commercial workshops or large home additions: 200A. Aerosphere does a free load calculation to size correctly.
Do I need a permit for a sub-panel?
Yes. Every Orange County city requires a building permit and electrical inspection for sub-panel installation. Aerosphere pulls the permit, schedules inspection, and coordinates with SCE if the main service needs upsizing to support the sub-panel load.
Service Areas
Aerosphere Electric serves all of Orange County including: Anaheim · Irvine · Santa Ana · Huntington Beach · Garden Grove · Fullerton · Costa Mesa · Mission Viejo · Fountain Valley · Yorba Linda · Lake Forest · Newport Beach · Tustin · Orange · Buena Park · Brea. C10 + C20 California contractor license 1108650.