ADU Electrical Wiring in Santa Rosa, CA
Building an accessory dwelling unit means adding an entire second home's worth of electrical demand to a property that was never designed for it — which is why ADU electrical work is a bigger job than most homeowners expect, and why getting the panel, circuit, and permitting decisions right early saves real money later. J&J Electric handles that side of Santa Rosa ADU projects: load calculations, subpanel and service upgrade decisions, EV- and battery-ready pre-wiring, and the permitting that goes with all of it.
- We'll tell you honestly where the real delay usually is. It's often PG&E's own connection process, not the electrical work itself — and knowing that up front changes how you plan your timeline.
- Subpanel or separate meter? We'll give you a real answer. Not a vague “it depends” — an answer based on your property, your ADU, and current utility policy.
- We plan for where California's code is headed, not just where it's been. EV-ready and battery-ready pre-wiring are already required on most new ADUs — we build to that standard from the start.
5.0 ★
16 Google reviews
2019
Serving Sonoma County since
C-10 #1078243
Licensed & insured
Sonoma County
Owned & operated
Why Santa Rosa Homeowners Choose J&J Electric
- Licensed, insured, and verifiable — CA C-10 #1078243, checkable yourself at cslb.ca.gov
- Honest, itemized pricing — a written estimate before we touch anything
- We explain what's actually in our control and what isn't — including utility timelines
- Local, on-time & respectful — a Santa Rosa-based crew that shows up on schedule
Planning an ADU? Call (707) 480-8331 or request a quote below and we'll walk through what your specific project needs.
What Is ADU Electrical Wiring?
ADU electrical wiring is the complete electrical scope behind an accessory dwelling unit — the load calculation that determines how much power the unit actually needs, the decision between a subpanel and a separate utility meter, all the branch circuits a kitchen, bathroom, and laundry area require, and the permitting and inspections that make it official. Because California treats most ADUs as new construction, this work also has to account for Title 24 energy code requirements, including EV-charger-ready and, as of 2026, battery-ready pre-wiring.
This applies whether you're building a detached backyard unit from the ground up, converting an existing garage, or adding a smaller junior ADU (JADU) within your home's existing footprint — each comes with real differences in what's required and what it costs. And because an ADU adds an entire second unit's worth of demand to your property's electrical system, this is bigger-scope work than a typical remodel, even when the unit itself is small.
Our ADU Electrical Process
ADU electrical work has more moving parts than most remodels — your panel, the utility company, and the city's permit office all have to line up. Here's the sequence that keeps that from turning into delays:
- Load Calculation & Design Walkthrough — We calculate your ADU's actual electrical demand and walk through whether your existing panel can support it, or whether you need a subpanel, a service upgrade, or a separate meter.
- Permitting — We prepare and pull the electrical permit through the City of Santa Rosa for the scope of work, coordinated with your ADU's overall building permit.
- Rough-In — Panel or subpanel installation, feeder and branch circuit wiring, and EV- and battery-ready conduit all get run before walls close up.
- Trim-Out — Outlets, switches, and fixtures go in, and all circuits get connected and tested.
- Inspection & Utility Coordination — The city inspector signs off on our work, and if a separate meter or new service is involved, we coordinate what we can with PG&E — while being upfront that their connection timeline is ultimately theirs to control, not ours.
Here's the honest part: the electrical work itself often isn't the longest step. PG&E's own utility interconnection process has been widely reported to run well beyond its stated averages for ADU projects across California — serious enough that state legislators have introduced bills specifically targeting these delays. We'll tell you plainly when a wait is on our end versus the utility's.
How Much Does ADU Electrical Wiring Cost?
ADU electrical costs vary widely by scope: a subpanel typically runs $500 to $2,200, a full main service upgrade (needed when your existing service can't support the added load) runs roughly $1,800 to $5,500, and a separate utility meter, where required or chosen, can add another $2,000 to $5,000. The only way to get a real number is a load calculation specific to your property.
A few things move that number more than anything else:
- Subpanel vs. separate meter vs. service upgrade. These are genuinely different jobs at genuinely different price points — we'll help you figure out which one your project actually needs.
- Existing panel capacity. A load calculation determines whether your current panel has room, or whether it needs an upgrade first.
- ADU size and appliance plan. A small studio with a mini-split needs far less capacity than a full ADU with a kitchen, laundry, and central air.
- EV-ready and battery-ready pre-wiring. Increasingly required under Title 24, and far cheaper to build in now than to retrofit later.
- Permit and inspection fees. Calculated by the City of Santa Rosa based on the value of the work performed.
Want a real number for your ADU? Call (707) 480-8331 or request a quote below for a load calculation and written estimate.
Subpanel vs. Separate Meter: Which Does Your ADU Need?
A subpanel is a secondary panel fed from your home's existing electrical service, giving the ADU its own dedicated circuits without a separate utility account — it's usually the simpler, less expensive option, and it's the right call whenever your main service has enough spare capacity to cover the ADU's load. A separate electric meter, by contrast, gives the ADU its own utility account and bill entirely, which matters most if you're planning to rent the unit long-term and want utility costs cleanly separated from the main house.
Here's the part that trips people up: California state law generally prevents local agencies from requiring a separate utility connection for most ADUs, but that's a different question from what your specific utility company's own policy is — and homeowners have run into real, documented confusion where a utility asked for something that arguably wasn't legally required at the city level. We'll help you get a straight answer rather than guessing.
ADU Electrical Wiring
What's Included: ADU Electrical Services We Handle
Load Calculations
A licensed electrician's calculation of your ADU's actual electrical demand — the real, code-required starting point for every panel, subpanel, and service decision that follows, instead of a guess.
Subpanel Installation
A dedicated secondary panel for your ADU's circuits, fed from your home's existing service — the most common, cost-effective solution when your main panel has room for the added load.
Electrical Service & Panel Upgrades
When your existing service can't support the ADU's added demand, we upgrade the main panel — typically to 200 amps — to cover both the house and the new unit.
EV- & Battery-Ready Pre-Wiring
Conduit and reserved capacity for a future Level 2 EV charger at the ADU's parking space, plus the dedicated 240-volt circuit and panel space California's 2026 Title 24 update now requires for future battery storage.
Dedicated Circuits (Kitchen, Bath, Laundry)
The same code-required dedicated circuits any new home needs, sized and placed for your ADU's specific kitchen, bathroom, and laundry layout.
Permits & Inspections
We prepare and pull the electrical permit through the City of Santa Rosa and coordinate the required inspections, including for homeowners looking to legalize an existing, previously unpermitted ADU.
Why Choose J&J Electric for Your ADU
We're honest about what's actually in our control
If PG&E's timeline is the real bottleneck, we'll say so — instead of letting you assume it's the electrical work holding things up.
We build to where the code is going, not just where it's been
EV-ready and battery-ready pre-wiring are already part of how we plan new ADU electrical work.
We start with a real load calculation, not a guess
Every panel, subpanel, and service decision follows from an actual number, not a rule of thumb.
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 handles ADU electrical wiring throughout Santa Rosa — including Downtown, Montgomery Village, Fountaingrove, Rincon Valley, Bennett Valley, Oakmont, Roseland, West Santa Rosa, and the rebuilt Coffey Park neighborhood — plus Windsor, Healdsburg, Sebastopol, Rohnert Park, Cotati, Sonoma, and Petaluma beyond city limits. Whether you're building a new backyard unit, converting a garage, or legalizing an ADU that's been there for years without permits, we'll evaluate your property's actual electrical capacity rather than assuming.
FAQ
Frequently Asked Questions
Does an ADU need a separate electrical panel?
In most cases, yes — either a dedicated subpanel fed from your home's existing service, or in some cases a fully separate service, depending on your ADU's size and electrical demand. A load calculation determines which one your specific project needs.
Does an ADU need its own electric meter in California?
It depends on your specific city, utility company, and whether the ADU is attached or detached. California state law generally prevents local agencies from requiring a separate utility connection for most ADUs, but utility companies may have their own separate-meter policies — this is worth confirming directly for your project rather than assuming either way.
How much does it cost to add electrical for an ADU?
Industry data suggests a subpanel typically runs $500–$2,200, a full service upgrade runs $1,800–$5,500, and a separate meter can add $2,000–$5,000. That's general market data, not a fixed J&J quote — call (707) 480-8331 for a number based on a load calculation specific to your property.
Why does PG&E take so long to connect an ADU?
PG&E's own stated average for new-service connections has been cited around eight weeks, but many California homeowners and builders have reported waits well beyond that — serious enough that state legislators have introduced bills specifically targeting ADU utility-connection delays. This is generally outside a contractor's control, but worth planning around.
What amperage panel does an ADU need?
Most ADUs end up needing 60 to 200 amps of dedicated capacity, depending on size and appliances — a small studio with a mini-split might only need 60 amps, while a larger ADU with a full kitchen and central air could need 100 amps or more. A load calculation determines the right number for your specific unit.
Does my ADU need to be solar-ready?
Most newly-built detached ADUs are treated as new construction under California's Title 24 energy code, which generally requires solar readiness, though smaller units may qualify for an exemption based on their calculated system size.
What is battery-ready pre-wiring and does my ADU need it?
As of the 2025 Title 24 update (effective January 1, 2026), most new ADUs need a dedicated 240-volt circuit and reserved panel space for a future battery storage system, even if you don't install a battery right away.
Can I legalize an ADU that was built without permits?
In Santa Rosa, yes — the City allows homeowners to apply to legalize an existing, unpermitted ADU, including an initial inquiry without risk of penalty for that inquiry itself. Since unpermitted electrical work can affect home insurance coverage, it's worth having a licensed electrician evaluate what's actually behind the walls first.
Subpanel vs. separate meter — what's the difference for an ADU?
A subpanel gives your ADU its own dedicated circuits fed from your home's existing electrical service and utility account; a separate meter gives the ADU its own utility account and bill entirely. Subpanels are usually simpler and less expensive; separate meters matter more if you're renting the unit long-term.
Does a junior ADU (JADU) have different electrical requirements than a full ADU?
Generally, yes — JADUs are specifically exempt from separate utility connection requirements under state law, since they're created within an existing home's footprint rather than as a new standalone structure.
Get Your ADU Wired Right — Contact J&J Electric
Whether you're still in the planning stage or your ADU permit is already submitted, it's worth getting a real load calculation before your panel decisions are locked in. (707) 480-8331 or request a quote below and we'll set up a time to walk through your property.
California C-10 License #1078243
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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.