Sub-Panel Installation in Santa Rosa, CA — Power Where You Actually Need It
A garage, workshop, ADU, or addition that needs its own circuits shouldn't have to fight an already-full main panel for scraps. J&J Electric installs sub-panels throughout Santa Rosa and Sonoma County — sized to what the space actually needs, permitted and inspected under one C-10 license.
- A real answer on cost, not a form you fill out to find out. We'll tell you what actually drives the price before you ever pick up the phone.
- We'll tell you if a subpanel isn't even what you need. Sometimes a few added circuits solve it — we won't sell you more than the job calls for.
- Detached structures done right. Garage, shop, or barn — proper feeder sizing and grounding for a building that isn't your house.
5.0 ★
16 Google reviews
2019
Serving Sonoma County since
C-10 #1078243
Licensed & insured
Sonoma County
Owned & operated
Why Santa Rosa Chooses J&J Electric for Sub-Panel Installation
- Licensed, Insured & Verifiable — CA C-10 #1078243, checkable yourself at cslb.ca.gov.
- Honest, Itemized Pricing — a written estimate before we touch anything, and the number doesn't move once we start.
- We Handle Permits & Inspections — filed under our own license, start to finish.
- Local, On-Time & Respectful — a Santa Rosa-based crew that shows up on schedule.
What Is Sub-Panel Installation?
A sub-panel is a secondary electrical panel fed from your home's main panel, giving a garage, workshop, ADU, addition, or detached structure its own dedicated set of circuits without overloading the main service. Rather than running every new circuit all the way back to an already-full main panel, a properly sized sub-panel gives that space its own distribution point — cleanly wired, grounded and bonded to code, and labeled so there's no guesswork later. J&J Electric installs sub-panels throughout Santa Rosa and Sonoma County under one C-10 license, #1078243, for everything from a home workshop to a full ADU.
Our Process
Here's what happens after you call (707) 480-8331:
- You call or request a quote. Tell us about the space — a garage, a shop, an ADU, an addition — and what you're planning to run off it.
- We assess what you actually have. This means checking your main panel's existing capacity before we size anything, so we don't recommend more than the job needs.
- You get a written, itemized estimate. Labor, materials, and permit costs broken down clearly — no lump-sum guessing.
- We pull the permit. Filed under our own license, with the City of Santa Rosa or Sonoma County inspection scheduled by us.
- We install the sub-panel. Feeder sized and run, panel mounted and wired, grounding and bonding done to code, everything clearly labeled.
- Final inspection. Your sub-panel passes inspection before we call the job done, and you get a clear explanation of what was installed and how it's protected.
How Much Does Sub-Panel Installation Cost in Santa Rosa?
Sub-panel installation is priced by scope rather than a flat rate, because a short run to an attached garage costs very differently than a long underground feeder to a detached barn or shop. The main factors are the length and type of feeder run, whether the structure is attached or detached, how many circuits the new panel needs to support, and whether your main panel has spare capacity to feed it. We give you a written, itemized estimate after assessing the actual site — so you know the real number before any work starts.
Sub-Panel vs. Panel Upgrade — Which Do You Need?
A panel upgrade replaces your home's main breaker box with one rated for more capacity — the right move when your whole house is outgrowing its service. A sub-panel is different: it adds a second, smaller panel fed from your existing main, giving one specific space — a garage, workshop, ADU, or addition — its own dedicated circuits.
If your main panel already has spare capacity and breaker space, a sub-panel is often the simpler, less expensive path. If your main panel is already full or undersized for the house as a whole, a panel upgrade may need to happen first, or alongside the sub-panel. We'll check your main panel's actual capacity before recommending either one — sometimes the honest answer is that a few added circuits solve the problem without a sub-panel at all.
Sub-Panel Installation
What's Included — Sub-Panel Installation We Handle
Garage & Workshop Sub-Panels
A home workshop with power tools, compressors, or welding equipment needs dedicated circuits sized for real load — not shared outlets fighting for the same breaker.
ADU & Addition Distribution
A new accessory dwelling unit or home addition typically needs its own circuit distribution, and a properly sized sub-panel keeps that space cleanly separated from the rest of the house's electrical system.
Detached Structure Feeders (Barns, Shops, Garages)
Feeding a detached building means running a properly sized feeder — underground or overhead — and grounding the structure correctly on its own, since a detached building's electrical system isn't grounded the same way an attached space is.
EV Charger & Hot Tub Circuit Support
A sub-panel is often the cleanest way to add a dedicated 240V circuit for an EV charger or hot tub without touching your main panel's existing breaker space. See our EV charger installation page →
Future-Ready Expansion
We size sub-panels with room to add circuits later, not just for what you need today — so the next project doesn't mean starting over.
Why Choose J&J Electric for Sub-Panel Installation
We'll tell you if you don't need one
A real assessment of your main panel's capacity comes before any recommendation — we're not interested in selling you a bigger job than your space requires.
We pull the permit every time
Sub-panels require the same permit process as main panel work in Santa Rosa and Sonoma County, and we handle it under our own license.
We handle detached structures correctly
Proper feeder sizing and independent grounding for a garage, shop, or barn — not a shortcut that fails inspection.
We're licensed, and we'd rather you check than trust us blindly
C-10 #1078243 is public record at cslb.ca.gov.
Reviews
What Santa Rosa Clients Say About Us
Google Rating
5.0 ★
Based on 16 reviews
Quotes shown are website testimonials from J&J Electric clients.
Service Area
Serving Santa Rosa & Sonoma County
J&J Electric installs sub-panels throughout Santa Rosa, including Downtown, Montgomery Village, Fountaingrove, Rincon Valley, Bennett Valley, Oakmont, Roseland, and West Santa Rosa — plus the rebuilt neighborhoods of Coffey Park. Beyond city limits, we regularly serve Windsor, Healdsburg, Sebastopol, Rohnert Park, Cotati, Sonoma, and Petaluma. Wherever you're located in that footprint, you get the same licensed, honest, itemized-quote approach.
FAQ
Frequently Asked Questions
How much does sub-panel installation cost?
Pricing depends on the feeder length, whether the structure is attached or detached, and how many circuits the new panel needs to support. You get a written estimate before work begins.
How long does sub-panel installation take?
Most residential sub-panel installs are a single day's work; underground feeders or detached-structure jobs sometimes take longer.
Do I need a sub-panel, or would adding a few circuits to my main panel be enough?
It depends on how many circuits the space needs and how far it is from your main panel. If it's a lot of circuits or a long distance, a sub-panel is usually the cleaner, more expandable option. We'll give you an honest read after seeing the site.
Will a sub-panel overload my main panel?
We check your main panel's existing capacity before sizing the sub-panel's feeder, so the whole system stays safely within its limits.
Do I need a permit for a sub-panel?
Yes — sub-panels require the same permit and inspection process as main panel work in Santa Rosa and Sonoma County, and we handle that under our own license.
Can a sub-panel feed a detached garage, shop, or barn?
Yes — with a properly sized underground or overhead feeder and correct independent grounding for the detached structure.
Do I need a sub-panel for an ADU?
Often, yes. An ADU typically needs its own circuit distribution, and a sub-panel is usually the cleanest way to provide it without overloading the main house panel.
Can I add more circuits to a sub-panel later?
Yes — we size sub-panels with room to expand, so adding a circuit later doesn't mean starting the project over.
Are you licensed and insured?
Yes — California C-10 #1078243, fully insured. You can verify the license yourself at cslb.ca.gov.
Do you serve my Santa Rosa neighborhood?
We work throughout Santa Rosa and greater Sonoma County. Call (707) 480-8331 to confirm your specific address.
Ready to Power That Garage, Shop, or ADU?
Whether it's a workshop, an ADU, or a detached structure that needs its own circuits, call J&J Electric at (707) 480-8331 or fill out the form below for your free, written, itemized quote.
California C-10 License #1078243
Phone
Hours
Monday–Friday, 8:00 AM–5:00 PM
Residential Electrical Services in Santa Rosa
J&J Electric keeps Santa Rosa homes safe and powered with complete residential electrical services — from troubleshooting and repairs to outlet and switch installation, ceiling fans, whole-home rewiring, surge protection, and lighting. Our licensed C-10 electricians work in every neighborhood, including Fountaingrove and Rincon Valley, bringing code-compliant workmanship to older post-Tubbs-Fire rebuilds and new construction alike. Whether you need a quick fix or a full electrical remodel for a kitchen or bath, we deliver clean, reliable results backed by clear communication and honest, itemized pricing. Call (707) 480-8331 to schedule your residential service.
Commercial Electrician Services in Santa Rosa
J&J Electric delivers reliable commercial electrical services for offices, retail spaces, restaurants, businesses, and commercial properties throughout Santa Rosa and Sonoma County. We handle electrical installations, tenant improvements, panel and service upgrades, lighting retrofits, equipment connections, repairs, maintenance, and code corrections while working to minimize disruption to your operations. Our licensed C-10 team provides professional, code-compliant electrical solutions built around safety, reliability, and long-term performance. Request a commercial quote at (707) 480-8331.
24/7 Emergency Electrician in Santa Rosa
When an electrical problem creates an immediate safety concern or disrupts your home or business, J&J Electric provides emergency electrical assistance throughout Santa Rosa and surrounding Sonoma County communities. Our electricians can troubleshoot urgent issues including electrical shorts, sparking outlets, damaged wiring, breaker problems, overheating, panel emergencies, and other dangerous electrical conditions. We focus on identifying the source of the problem, making the situation safe, and providing a clear path toward a reliable repair. Call (707) 480-8331 to upgrade your electrical panel.
Winery & Vineyard Electrician in Santa Rosa
J&J Electric provides specialized electrical services for wineries, vineyards, and wine-production facilities throughout Sonoma County and the North Bay. Our team understands the importance of dependable electrical systems during production and harvest season and can assist with winery installations, equipment connections, pumps and motors, lighting, panels, repairs, maintenance, and code corrections. We work with commercial property owners and winery operators to deliver safe, reliable electrical systems while helping minimize operational downtime. Call (707) 480-8331 to book your EV charger installation.