Interior wall framing under construction with exposed studs, electrical boxes, and sunlight on the floor.

ADU Electrical Wiring and Sub-Panel Installation in Huntington Beach, CA

Sun Day Electric wires accessory dwelling units for Huntington Beach homeowners, from the sub-panel that gives an ADU its own dedicated power to the outlets, lighting, and appliance circuits inside it. Whether you're building a new ADU, converting a garage into one, or adding a granny flat, we plan the electrical work around your existing panel's capacity so the unit runs safely and independently. We offer free quotes on every job, and our crew brings 25+ years of hands-on experience and full insurance to every project.

ADU - Additional dwelling unit

At Sun Day Electric we make your ADU project simple, clear and done right the first time. We provide straightforward, transparent pricing so you know exactly what to expect. Our team is highly experienced in reading plans and working closely with homeowners, contractors, inspectors and utility technicians to ensure every detail is counted for during the build. From rough into final we help make sure your ADU has everything it needs efficient code compliant and built to last.

What an ADU Needs Electrically

A dedicated sub-panel.Most ADUs need their own sub-panel so the unit's kitchen, bath, and living circuits run independently of the main house's power.

Full interior wiring.Outlets, switches, and lighting circuits throughout the unit, plus dedicated circuits for major appliances like a range, water heater, or in-unit laundry.

Capacity planning.A load calculation to confirm whether your existing main panel can support the new ADU circuits, or whether a full panel upgrade is needed before the ADU work starts.

Sun Day Electric evaluates the existing panel's available capacity during the free quote visit to confirm whether a sub-panel is sufficient for your ADU or a full panel upgrade is needed instead.

Breaker panel installed on Tyvek-wrapped exterior wall, with ladder beside it.
White interior room under construction with door, windows, a chair, and tools on a covered floor.

How We Approach an ADU Wiring Project

Assess existing capacity.Sun Day Electric checks the main panel's available amperage and runs a load calculation to confirm it can support the new ADU circuits.

Install the sub-panel and wiring.We run the feeder circuit, install the sub-panel inside or near the ADU, and wire outlets, switches, lighting, and appliance circuits throughout the unit.

Permit and inspect.ADU electrical work requires permits and inspections under California code, and Sun Day Electric handles that paperwork and coordinates every inspection as part of the job.

If your main panel is already at capacity, we'll walk you through options like a full panel upgrade before the ADU wiring begins, so there are no surprises once the work is underway.

ADU Wiring Questions From Huntington Beach Homeowners

  • Does my ADU need its own sub-panel?

    In most cases, yes. A dedicated sub-panel lets the ADU's kitchen, bath, and living area circuits run independently while still drawing from the home's existing service where capacity allows.

  • Do I need a permit for ADU electrical wiring in Huntington Beach?

    Yes, ADU electrical work requires permits and inspections under California code. Sun Day Electric pulls the permits and coordinates every inspection as part of the job.

  • Can my existing main panel handle a new ADU?

    It depends on the panel's available capacity and a load calculation. Sun Day Electric checks this during the free quote visit, and if the panel is already at capacity, a full panel upgrade may be recommended before the ADU wiring starts.

  • How long does ADU electrical wiring take?

    Timelines vary with the size of the unit and scope of work, but full ADU wiring typically takes several days to complete, not including permitting and inspection scheduling.

Wire Your ADU the Right Way

Free quotes are available for ADU electrical wiring projects. Sun Day Electric is fully insured with weekday availability Monday through Friday, 7:30 AM to 6:00 PM.