ADU Electrical Requirements in Los Angeles County: What You Need Before You Build
Accessory Dwelling Units are booming across Los Angeles County. Whether you're adding a detached backyard unit, converting a garage, or building a junior ADU inside your existing home, it represents a serious investment. But before you focus on square footage and finishes, the electrical needs to be done right — from the start.
At B&M Electrical Services, we handle complete ADU electrical installations for homeowners across the Antelope Valley, Santa Clarita Valley, San Fernando Valley, and greater Los Angeles — fully permitted and code-compliant.
Does Your ADU Need Its Own Electrical Service?
It depends on size and your existing panel's capacity. A small attached ADU may run from a new sub-panel and dedicated circuits tied to your main service. A larger detached ADU — or one intended as a rental — typically requires its own meter and service entrance. We assess your existing system and advise on the most cost-effective approach before any work begins.
What Electrical Work Does an ADU Require?
- Sub-panel or separate service: Sized for the ADU's full load — HVAC, appliances, water heater, and EV charger if planned.
- Dedicated circuits: Kitchen, HVAC, laundry, and bathroom all require dedicated circuits per code.
- GFCI and AFCI protection: Required in kitchens, bathrooms, garages, and outdoor areas under current NEC standards.
- Hardwired smoke and CO detectors: Interconnected per California residential code.
- Interior and exterior lighting: Including recessed lighting and pathway lighting as needed.
Permits Are Required — No Exceptions
All ADU electrical work in Los Angeles County requires permits through LA County Building & Safety or the relevant city department. LA County's ADU program has streamlined approvals — but only when your contractor is licensed and submits compliant plans. We manage the permit process and coordinate with inspectors so you don't have to.
Get the Electrician Involved Early
Retrofitting electrical after walls are closed is expensive and disruptive. Involving a licensed electrician at the planning stage saves time and money on every ADU project — and ensures you pass inspection the first time.
Owner and Master Electrician Barrett brings 29 years of experience and a 4.8-star rating from 113+ Google reviewers across Palmdale, Santa Clarita, Van Nuys, and all of Los Angeles County. Request a free quote or call (661) 676-0615. Licensed · Bonded · Insured.