What Novato and San Rafael Property Owners Should Know About Upgrading Electrical Service in an Older Commercial Building
If you own or lease commercial space in Novato or San Rafael — or anywhere across Marin County and southern Sonoma County — and your building was constructed before the 1990s, there is a reasonable chance the electrical service was sized for a business that looked nothing like yours. A flooring showroom that’s now a café kitchen. A single-tenant office building now carved into five suites. A light industrial space adding EV fleet charging. When the electrical service can’t keep up, tenants lose power, breakers trip during busy hours, and expansions stall out waiting on capacity that was never there. Here’s what the upgrade process actually looks like — in plain terms — and why this is one of the most important things to understand before signing a lease or kicking off a tenant improvement.
Why Older Commercial Buildings Run Out of Electrical Capacity
Most commercial buildings constructed in the 1960s, 70s, and 80s were designed around the electrical loads of that era: fluorescent lights, a few plug-in appliances, basic HVAC, and maybe one or two pieces of dedicated equipment. A 100-amp or 200-amp single-phase service was considered adequate for a wide range of light commercial uses.
Today, that same building might house a restaurant with commercial refrigeration and a convection oven, a medical tenant with imaging equipment, or a contractor’s office with EV chargers in the parking lot. None of those uses were factored into the original service calculation. The panel didn’t get any bigger when the tenant changed — and in many cases, nobody flagged it until breakers started tripping or a new tenant’s equipment permit got flagged during plan check.
In Marin County and along the US-101 corridor up through Petaluma and Rohnert Park, this situation is common. The building stock is older, the uses have evolved, and the gap between original service capacity and actual load has quietly widened over decades.
What a Commercial Service Upgrade Actually Involves
A commercial electrical service upgrade is more complex than a residential panel swap. Here’s a realistic breakdown of the moving parts:
- Load calculation first. Before any equipment is specified or permits are pulled, a licensed electrician needs to calculate the actual load your building is running — and what the new use or tenant build-out will add. This isn’t guesswork. It’s a code-required calculation based on your square footage, equipment, lighting, HVAC, and any dedicated circuits. If someone quotes you a panel size without doing this first, that’s a red flag.
- Service size decision: 200A, 400A, or larger. For smaller commercial suites, a 200-amp three-phase or single-phase service may be adequate. Larger buildings, multi-tenant properties, or spaces with heavy equipment often need 400-amp service or a combination of a main service and sub-metered subpanels. The right answer depends on your load calculation — not on a ballpark guess.
- PG&E coordination. Unlike a simple outlet repair, a service upgrade requires PG&E to physically disconnect and reconnect the utility feed at the meter. In practice, this means scheduling with PG&E — which can take weeks depending on their current workload — and planning the work so your tenants aren’t dark any longer than necessary. We coordinate that scheduling directly so you’re not chasing PG&E on your own, and the power is off for hours, not days.
- Permit and inspection. Every commercial service upgrade requires a permit pulled with the local building department and a final inspection before PG&E will reconnect. This is not optional and not a formality — it’s the mechanism that protects you as a property owner. Any contractor offering to skip the permit process is exposing you to liability and insurance issues you don’t want.
The Question Competitors Aren’t Answering: What Happens to Existing Tenants During an Upgrade?
This is the practical question that most electrical contractor websites — including several serving the Novato and San Rafael market — don’t bother to address. If you have tenants in the building, a service upgrade requires a power outage. That outage needs to be managed carefully.
Here’s how we handle it: before work starts, you get a written scope that spells out exactly what will happen, in what order, and what the expected outage window looks like. We schedule PG&E disconnects to minimize downtime — typically targeting early morning start times so that even in a worst-case scenario, power is restored the same day. For multi-tenant buildings, we’ve sequenced work around critical tenants — a medical office, a restaurant with a walk-in cooler — to isolate circuits and minimize impact where the panel configuration allows it.
If it can be done in a way that protects your tenants’ operations, we’ll tell you how. If there’s no way around a full-day outage, we’ll tell you that too — honestly, in writing, before you commit to anything.
Tenant Improvements and Service Upgrades: When They Happen Together
A lot of commercial service upgrades happen in conjunction with a tenant build-out. A new restaurant tenant needs a 200-amp subpanel fed from a 400-amp main. A salon is moving into a 1970s retail space and needs dedicated circuits for dryers and color-processing stations. A Petaluma or Santa Rosa business expanding into a second suite needs a new subpanel on the existing service.
In these situations, the service upgrade and the tenant improvement are really one project — and they need to be permitted and inspected together. Using a single contractor for both avoids the situation where the electrician doing the tenant improvement discovers mid-project that the main service can’t support the load, and now you have a scheduling conflict between two separate contractors and a PG&E disconnect that nobody owns. We handle the full scope under one license and one permit process, which keeps the project moving.
Commercial EV Charging Is Driving More Upgrade Requests Than Anything Else Right Now
If you own a commercial property in Novato, San Rafael, or anywhere along the 101 corridor, you’ve probably fielded a request from a tenant or your own fleet manager about adding EV charging. Even a modest installation — say, four Level 2 chargers in a parking lot — can add 60 to 80 amps of continuous load. That kind of addition will push most older 200-amp commercial services past their practical limit.
This is exactly the kind of project where a load calculation matters before anyone purchases equipment or designs the charging layout. The answer might be that your existing service can support two chargers now and two more after a panel upgrade. Or it might be that the upgrade needs to happen first. Either way, you need that answer before chargers are ordered and conduit is trenched. Our EV charger installation process starts with that calculation — not with a sales pitch for the most expensive hardware on the market.
What to Look for in a Contractor for This Kind of Work
Commercial service upgrades are not a category where you want the lowest bidder. Here’s what actually matters:
- CSLB license verification. Check it. Our license is CSLB #1156335 — licensed, bonded, and insured. You can verify that in about 30 seconds on the CSLB website.
- Written scope before work starts. Not a verbal estimate. A written scope that describes the panel size, the circuits being added or modified, the permit process, and the PG&E coordination plan.
- Experience with commercial permits in your jurisdiction. San Rafael, Novato, and Rohnert Park all have their own building departments with their own processes. A contractor who pulls permits regularly in these jurisdictions knows how to move projects through plan check without delays.
- Honest load calculations. If a contractor recommends a panel size without asking about your tenants, your equipment, or your future plans — walk away. A load calculation isn’t optional for commercial work.
We’ve been doing this work for over 20 years, based in Rohnert Park, serving property owners from Cloverdale down through Marin County. No trip charge. 5.0-star Google rating. Every job permitted and inspected.
Frequently Asked Questions
How long does a commercial service upgrade take?
The physical work at the building usually takes one to two days. The longer timeline is permit approval and PG&E scheduling, which can add two to six weeks depending on jurisdiction and PG&E’s current backlog. We start that coordination early so it doesn’t hold up your project unnecessarily.
Do I need a service upgrade if I’m just adding one new circuit?
Not always. A load calculation will show whether your existing service has enough headroom for the new circuit. If it does, we add the circuit. If it doesn’t, we’ll tell you what the upgrade would cost and let you decide — we’re not going to recommend work you don’t need.
Who is responsible for the electrical permit — the landlord or the tenant?
It depends on your lease and what the work involves. Main service upgrades are generally the landlord’s responsibility; tenant improvement work inside the suite is typically the tenant’s. We’ve worked on both sides of that equation and can advise on how to structure the permit correctly so there’s no ambiguity at inspection.
Can my building handle EV charging without a service upgrade?
Sometimes yes, sometimes no. It depends entirely on your existing service size and what else is running. We do a load calculation before recommending anything. Adding chargers without checking first is how you end up with nuisance tripping or a failed inspection.
Do you work in Marin County, or just Sonoma County?
We serve the full North Bay area, including Novato and San Rafael. No trip charge, same licensing and permitting process. See our full service area for details.
Get a Written Estimate Before You Commit to Anything
If you’re managing a commercial property in Novato, San Rafael, Petaluma, or anywhere across Sonoma and Marin County, and you have questions about whether your electrical service is adequate for your current use or a planned build-out, the right first step is a site visit and a written estimate — not a phone guess. We’ll do the load calculation, walk through the permit and PG&E process, and give you a clear scope in writing before any work begins.
Contact Bright Right Electric to schedule a free estimate. CSLB #1156335. Based in Rohnert Park, serving the North Bay.