Project Overview

Breeden Electric, Inc. completed the electrical installation for a 480 square foot Accessory Dwelling Unit (ADU) located behind an existing residence. This project required careful planning because the ADU was connected to the same electrical meter and main service as the primary house.

The project included running power from the main house, installing a subpanel in the ADU, completing all interior wiring, and coordinating inspections through project completion.

Power From Existing Main Service

Since the ADU was served by the existing electrical service, our team installed a feeder from the main house to supply power to the new structure. Proper load calculations and panel capacity verification were completed to ensure the existing service could safely support the additional building.

This portion of the project included:

• Load calculations for the existing service
• Installing feeder wiring from the main panel to the ADU
• Installing a subpanel in the ADU
• Proper grounding and bonding
• Underground conduit and feeder installation

This setup allowed the ADU to operate independently while still being connected to the main electrical service.

Full ADU Electrical Installation

After power was run to the structure, Breeden Electric completed the full electrical wiring installation for the ADU.

Electrical work included:

• Rough-in wiring for lighting and receptacles
• Kitchen and appliance circuits
• Bathroom GFCI-protected circuits
• Mini-split HVAC electrical connection
• Interior and exterior lighting
• Smoke/CO detectors
• Final trim-out including devices and fixtures

Because ADUs are compact spaces, proper circuit planning and layout are important to maximize functionality while staying code compliant.

Inspections and Final Approval

The project successfully passed all required electrical inspections, including feeder installation, rough-in, and final inspection.

Our inspection process focused on:

• Proper feeder sizing and installation
• Subpanel labeling and organization
• GFCI and AFCI protection requirements
• Grounding and bonding
• Clean and professional installation

Passing inspections efficiently helped the homeowner move forward with completing and occupying the ADU.

Project Outcome

This ADU project was completed successfully and included:

• Feeder installation from existing main service
• Subpanel installation in ADU
• Complete electrical wiring for the 480 sq. ft. structure
• Rough-in and final inspections passed
• Code-compliant installation tied into existing residence service

Breeden Electric, Inc. performs electrical work for new construction, additions, ADUs, renovations, and remodel projects, helping homeowners and builders expand and improve existing properties with safe, reliable electrical systems.