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Electrical Case Study: Subpanel Installation for Increased Capacity in San Rafael, CA

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Robert Jason
Electrical subpanel installation
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Project Summary

Project Type

Subpanel Installation

Location

San Rafael, CA

Duration

1 Day

Services Provided

125A Subpanel, Breaker Upgrade, Circuit Re-routing

When a San Rafael homeowner needed to expand their electrical system to support future upgrades, they turned to Bellows Plumbing, Heating, Cooling & Electrical for a professional subpanel installation. This critical electrical upgrade increased the home’s power capacity, making room for high-demand appliances, EV chargers, and future circuit expansions. With code compliance, safety, and long-term reliability as top priorities, our licensed electricians completed a seamless subpanel installation that future-proofs the home’s electrical infrastructure.

Project Scope & Key Components

The project involved the installation of a 125 amp subpanel to accommodate new and future circuits. Key tasks included:

  • Mounting and securing the subpanel to the left exterior wall of the home
  • Installing a new wire from the main panel to the subpanel
  • Adding a 125 amp breaker at the main panel
  • Routing existing circuits from the main panel to the new subpanel
  • Installing and labeling new breakers
  • Cleaning up and hauling away job debris

Installation Phases & Timeline

With the scope clearly defined, our licensed electricians at Bellows Plumbing, Heating, Cooling & Electrical began the subpanel installation with precision and attention to detail. The two-person crew completed the project in just one day, minimizing disruption to the homeowner’s routine. From selecting the optimal mounting location to integrating new circuits seamlessly, every step was carefully planned to meet code requirements and exceed expectations. Below is a breakdown of how we delivered long-term safety, improved organization, and expanded electrical capacity for the home.

Subpanel Setup and Circuit Re-routing

  • Chose optimal subpanel location despite a stud behind the wall
  • Adjusted positioning to maintain crawlspace access and code compliance
  • Installed a 125 amp breaker in the main panel to power the subpanel
  • Ran new wire from main panel to subpanel
  • Rerouted and relocated multiple circuits into the subpanel
  • Achieved a cleaner and more organized electrical layout

Testing and Finishing Touches

  • Tested and traced each circuit for proper functionality
  • Clearly labeled all breakers for homeowner convenience
  • Made wood notching and drywall adjustments for precise fit
  • Cleaned up entire work area after installation
  • Performed final walkthrough and inspection
  • Delivered a modernized, future-ready electrical system

Final Results & Homeowner Feedback

This subpanel installation was completed efficiently and with meticulous attention to detail by our licensed electricians. The homeowner now benefits from a safer, more organized, and future-ready electrical system. By upgrading to a 125 amp subpanel, they gained the capacity to support high-demand appliances, EV chargers, and other modern technology—without the risk of overloading circuits.

Every breaker was tested, traced, and clearly labeled to simplify future maintenance, and the system passed inspection without issue. The homeowner expressed appreciation for the clean finish and seamless integration, noting how professional and communicative the team was throughout the process. They now have peace of mind knowing their electrical system is built to meet modern demands and future upgrades.

Photo Highlights

At Bellows Plumbing, Heating, Cooling & Electrical, we believe that quality craftsmanship speaks for itself—and our electrical installations are no exception. From precise panel placement to careful circuit tracing and labeling, every step of this subpanel installation was handled with care and expertise.

Browse the photos below to see the attention to detail, clean execution, and code-compliant finish that our team consistently delivers. Whether it’s routing wiring through tight spaces or ensuring safe, accessible panel layouts, we go the extra mile to get it right the first time.

System Benefits & Long-Term Value

Upgrading with a properly installed subpanel provides homeowners with significant electrical advantages:

  • Increased capacity: The new 125 amp subpanel creates substantial additional power capacity, allowing the home to support more circuits and higher electrical demands.
  • Future-proofing: With modern homes requiring more power for appliances, EV chargers, and smart home systems, this installation prepares the property for technological advances and upgrades.
  • Improved organization: By rerouting circuits from the main panel to the subpanel, the electrical system becomes more organized and easier to manage for future maintenance or modifications.
  • Code compliance: The installation brings the home’s electrical system up to current safety standards, which is particularly important for insurance coverage and home resale value.
  • Safety improvements: Preventing circuit overloads by distributing the electrical load across two panels reduces fire hazards and protects sensitive electronics.
  • Home value: Updated electrical systems that meet modern needs are increasingly important selling points in today’s real estate market.

This subpanel installation demonstrates how thoughtful electrical upgrades can protect your home while providing the flexibility needed for modern living. By investing in proper electrical infrastructure now, the homeowner has avoided potential limitations and safety concerns down the road.

Why Homeowners Trust Bellows for Electrical Upgrades

From panel upgrades to subpanel installations and EV-ready solutions, Bellows electricians are licensed, code-compliant, and highly experienced. We take safety seriously — labeling circuits, routing clean wiring, and ensuring every job is inspection-ready. Whether you’re preparing for a remodel, upgrading to a high-efficiency furnace and AC system, future-proofing your power capacity, or switching to a tankless water heater, Bellows brings precision, expertise, and professionalism to every electrical project.

Need a Subpanel installation in San Rafael or the Bay Area?

Upgrade your electrical system with a safe, code-compliant subpanel installed by Bellows’ licensed electricians. Get more power and peace of mind fast.
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Staffan Lofgren
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Cody was very professional and friendly. Bellows is the best HVAC installer we have encountered.
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Cas Ellena
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Bellows was great, thank you for coming so fast and fixing the problem!
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Zach did a fantastic and determined job of conquering our leak from under our crawlspace. Bellows sent someone an hour after I called with a leak report, although it was the end of the day. He diagnosed the issue, got cold water working, and was back the next day with the parts for the hot. Great attitude and fabulous service. Thanks, team bellows!
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I received great service for my water heater. Nate was very professional and thorough.
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Bellows is outstanding. Best communication and the techs are amazing. Polite and always stay until the Job is done. Scottie is our hero. He is so helpful, polite and fixes every thing we need. We have used Bellows for out home for the last 14 years and never had anything other than 6 star service.
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Mark Scofield
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I give high praise to Bellows for performing three different jobs in succession. First, after being called to have a look, a Bellows troubleshooter recommended we replace our 40-year-old central furnace. We opted to respect his professional judgement. A two-man crew came and got the job done efficiently and with little disturbance. We asked for someone to have a look at our equally old shower valve. A man came to estimate the job then returned to replace it another day. Perfect! We love that we no longer wrestle with the old valve. Last, we asked that someone come to look at our home lighting. A man came to help us formulate a plan. Another two-man crew came and began work. We discussed our needs and minor changes were made to improve our environment further. In every case, we were treated courteously. When they requested permission to make changes, they were forthright and benefitted our environment. A sticking point to me, a retired craftsman, is cleanliness. Every person entering our home was professionally neat and left not the slightest dust for us after they left. I am impressed. Overall, my wife and I spoke with many people from Bellows both in person and on the phone. We would like to stress our perception that in every case, we felt we were working with a family business. That is, we were addressed courteously, and as friends, not simply clients. A few weeks on and we still marvel that we waited so long to do this work. As you see, we're glad we chose Bellows. Thanks!
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Christa from Bellows did a great job performing maintenance on our Generac. On time, proficient and explained everything prior to departure.
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Zach LaBare was awesome and fixed the hot water issue for my mother's ADU!
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Bellows came out the next day and found and fixed the problem with the fan motor. The tech was courteous, efficient and knowledgeable.
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