⚡ Licensed & Insured
🛡 6-Month Warranty
💰 Upfront Flat Pricing
📅 Same-Week Service
⭐ 5-Star Google Rated
⚡ Licensed & Insured 🛡 6-Month Warranty
💰 Upfront Flat Pricing. 📅 Same-Week Service
⭐ 5-Star Google Rated
ADU Electrical Services · Temecula, CA
ADU Electrical
Services in
Temecula, CA
Building an ADU in Temecula or the surrounding area? Thompson Electric handles complete ADU electrical — from the sub-panel and rough-in wiring to every outlet, switch, and fixture inside. Permitted, inspected, and done right.
ADU Electrical Services · Temecula, CA
ADU Electrical
Services in
Temecula, CA
Building an ADU in Temecula or the surrounding area? Thompson Electric handles complete ADU electrical — from the sub-panel and rough-in wiring to every outlet, switch, and fixture inside. Permitted, inspected, and done right.
ADU Electrical in Temecula
Every ADU Needs Its Own Electrical Service
An Accessory Dwelling Unit — whether it's a detached backyard cottage, a garage conversion, or an attached in-law suite — is treated as a separate dwelling by California electrical code. That means it needs its own dedicated sub-panel or separate electrical service, not just an extension cord run from the main house.
This is where a lot of ADU projects get complicated. The electrical isn't something you can add at the end — it needs to be planned from the start, coordinated with your general contractor, and permitted correctly with the city. Thompson Electric specializes in exactly this.
ADU Electrical Is a Specialty — Not an Afterthought
Richard has hands-on experience wiring ADUs across Temecula and Southwest Riverside County — from the initial load calculation and sub-panel sizing through rough-in wiring, trim-out, and final city inspection. We work directly with homeowners and general contractors and keep the electrical moving on schedule so your project doesn't stall.
Get Your Free ADU Electrical Quote
Upfront pricing · GC coordination · Full permits
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Full Scope Electrical
What Thompson Electric Handles on ADU Projects
We cover the complete electrical scope for ADU builds — from the first planning conversation to the final inspection sign-off.
Sub-Panel Installation
Every ADU requires a dedicated sub-panel fed from the main house panel or a separate utility service. We size it correctly for the unit's load and future needs.
Rough-In Wiring
All wiring run in walls, ceilings, and floors before drywall — circuits, outlet boxes, switch boxes, fixture boxes, and panel feeds. Coordinated with your GC's framing schedule.
Lighting & Fixtures
Recessed lighting, ceiling fan rough-in, bathroom exhaust fans, under-cabinet lighting, and all interior and exterior fixture installations.
Outlets & Switches
All outlets and switches installed and trimmed — including GFCI protection in kitchens and bathrooms, AFCI where required, and USB/smart outlets if specified.
Appliance Circuits
Dedicated circuits for kitchen appliances, washer/dryer, dishwasher, microwave, and any other high-draw equipment specified in the ADU plans.
Permits & Inspections
We pull all electrical permits, coordinate rough-in and final inspections with the city, and deliver a fully signed-off job ready for occupancy.
Full Scope Electrical
What Thompson Electric Handles on ADU Projects
We cover the complete electrical scope for ADU builds — from the first planning conversation to the final inspection sign-off.
Sub-Panel Installation
Every ADU requires a dedicated sub-panel fed from the main house panel or a separate utility service. We size it correctly for the unit's load and future needs.
Rough-In Wiring
All wiring run in walls, ceilings, and floors before drywall — circuits, outlet boxes, switch boxes, fixture boxes, and panel feeds. Coordinated with your GC's framing schedule.
Lighting & Fixtures
Recessed lighting, ceiling fan rough-in, bathroom exhaust fans, under-cabinet lighting, and all interior and exterior fixture installations.
Outlets & Switches
All outlets and switches installed and trimmed — including GFCI protection in kitchens and bathrooms, AFCI where required, and USB/smart outlets if specified.
Appliance Circuits
Dedicated circuits for kitchen appliances, washer/dryer, dishwasher, microwave, and any other high-draw equipment specified in the ADU plans.
Permits & Inspections
We pull all electrical permits, coordinate rough-in and final inspections with the city, and deliver a fully signed-off job ready for occupancy.
ADU Types We Work On
Detached, Attached, and Garage Conversions
The electrical scope and requirements vary by ADU type. Thompson Electric is experienced with all of them.
Detached backyard ADUs — full sub-panel, underground feed from main house, complete interior wiring
Attached ADUs and in-law suites — sub-panel off main panel, separate metering if required
Garage conversions — panel upgrade or sub-panel, rewire from scratch or adapt existing garage circuits
Junior ADUs (JADUs) — smaller scope, often sharing the main panel with added circuits for the unit
Two-story ADUs — multi-level wiring, stairwell lighting, proper circuit distribution across floors
ADU Types We Work On
Detached, Attached, and Garage Conversions
The electrical scope and requirements vary by ADU type. Thompson Electric is experienced with all of them.
Detached backyard ADUs — full sub-panel, underground feed from main house, complete interior wiring
Attached ADUs and in-law suites — sub-panel off main panel, separate metering if required
Garage conversions — panel upgrade or sub-panel, rewire from scratch or adapt existing garage circuits
Junior ADUs (JADUs) — smaller scope, often sharing the main panel with added circuits for the unit
Two-story ADUs — multi-level wiring, stairwell lighting, proper circuit distribution across floors
How It Works
ADU Electrical From Start to Final Inspection
Pre-Construction Planning
We review your ADU plans, calculate the electrical load, determine sub-panel size and location, and coordinate with your GC on the electrical scope and schedule.
Permit Application
We submit the electrical permit application to the city — coordinated with the overall ADU permit package. We handle all back-and-forth with the building department.
Rough-In Phase
All wiring, conduit, boxes, and the sub-panel are installed before drywall. We coordinate timing with your GC so rough-in is done before the walls close. Rough inspection is scheduled and passed.
Trim-Out & Finish
After drywall and paint, we return to install all devices — outlets, switches, fixtures, fans, appliance connections, and panel trim-out. Everything is tested and verified.
Final Inspection & Sign-Off
We schedule and attend the final electrical inspection with the city. Once passed, the permit is closed out and your ADU is electrically ready for occupancy.
How It Works
ADU Electrical From Start to Final Inspection
Pre-Construction Planning
We review your ADU plans, calculate the electrical load, determine sub-panel size and location, and coordinate with your GC on the electrical scope and schedule.
Permit Application
We submit the electrical permit application to the city — coordinated with the overall ADU permit package. We handle all back-and-forth with the building department.
Rough-In Phase
All wiring, conduit, boxes, and the sub-panel are installed before drywall. We coordinate timing with your GC so rough-in is done before the walls close. Rough inspection is scheduled and passed.
Trim-Out & Finish
After drywall and paint, we return to install all devices — outlets, switches, fixtures, fans, appliance connections, and panel trim-out. Everything is tested and verified.
Final Inspection & Sign-Off
We schedule and attend the final electrical inspection with the city. Once passed, the permit is closed out and your ADU is electrically ready for occupancy.
Common Questions
ADU Electrical FAQs
Does my ADU need its own electrical panel?
Every project is different. Thompson Electric provides a clear on-site diagnosis and upfront pricing before any work begins — so you know exactly what to expect with no hidden fees or surprise invoices.
Will I need to upgrade my main panel to add an ADU?
Many older homes were built for much lower electrical demand. If you're experiencing tripped breakers, dimming lights, or planning to add an EV charger, a panel upgrade may be necessary. Our electricians will inspect your system and give you an honest recommendation.
How much does ADU electrical cost in Temecula?
Most appointments are scheduled within the same week — often within 2–3 business days. For urgent situations, let us know and we'll do our best to prioritize. You can also call us directly at (760) 470-3296.
Can you work directly with my general contractor?
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Do you handle the electrical permit for the ADU?
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What Customers Say
Real Reviews from Real Customers
Verified Google reviews from homeowners served by Thompson Electric across Temecula and Southwest Riverside County.
"Richard and Julian did a great job with excellent workmanship and prompt service. After the garage job, Richard also performed several repairs inside. These guys Rock!"
"We are happy to have used Thompson Electric again. They communicate well and take care of our issues. We will continue to use them in the future."
"High quality work for a reasonable price. Prompt, professional, and friendly. I would definitely recommend Thompson Electric to anyone."
Building an ADU?
Get the Electrical Done Right
From Day One
Electrical planned wrong from the start causes delays, failed inspections, and expensive rework. Get Thompson Electric involved early and keep your ADU project on track.
Building an ADU?
Get the Electrical Done Right
From Day One
Electrical planned wrong from the start causes delays, failed inspections, and expensive rework. Get Thompson Electric involved early and keep your ADU project on track.
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Copyright 2026. Thompson Electric. All Rights Reserved.