Every panel replacement we do covers the full scope: removal, new equipment, permits, and inspection. What varies is the size of the panel and how much old wiring needs correcting along the way. Here is what comes standard on a San Mateo panel job.
A UL listed enclosure from Square D, Eaton, or Siemens with a main breaker sized to your load calculation. We install new circuit breakers throughout, land the grounding wire and neutral bar correctly, and torque every lug to the manufacturer spec.
We file the electrical permit with the city, meet the inspector on site, and hand you the signed card. You do not chase paperwork or schedule the inspection yourself. That is part of the job, not an add-on.
Every breaker gets labeled by room and load, not by a number nobody can trace. We use a circuit breaker finder to map each run so the label matches reality. The next electrician who opens that door will thank you.
We verify the grounding electrode conductor, bond the water and gas lines where required, and bring the grounding up to NEC code compliance. Poor grounding is behind a lot of surge damage we see on the Peninsula.
Before we leave, we test each circuit with a multimeter and check voltage under load with a clamp meter. You see the panel powered up and working, not just closed and promised. Any issue gets fixed before we pack up.
Electrical panel replacement San Mateo CA is the removal of your old service panel, fuse box, or breaker enclosure and the installation of a new, code-compliant panel sized for your home's actual load. We kill power at the meter, pull the old enclosure and bus bar, mount the new panel, land the grounding wire and neutral bar, torque every lug to spec, and label each circuit. Most homes finish in one day with a short utility disconnect window.
San Mateo homes built between the 1920s and 1960s were wired for a fraction of what a modern household pulls. Add an EV charger, a tankless water heater, or a mini-split and a 100 amp panel starts tripping. We see corroded panel connections from coastal fog in the 94402 and 94403 ZIP codes, warm panel covers from loose lugs, and fuse boxes that no longer meet NEC code compliance. If you have been searching for affordable electrical panel replacement San Mateo CA, we quote the job before we start.
Five steps, one day of work, and a clear answer on cost before we touch a screwdriver. Here is exactly what happens from your first call to the final inspection.
Schedule
Call or book online — a real human picks up and confirms a 2-hour arrival window.
Diagnose
Licensed tech inspects on-site, then walks you through the cause and your options.
Fix
The job is completed to code and done right the first time — no shortcuts, no surprises.
Project Completion
Every job backed by a written workmanship warranty — and we stand behind it.
Multimeter
Verifies voltage on each circuit before and after the swap so we know every run is live and correct before we close the panel.
Clamp Meter
Measures actual current draw under load to confirm the new panel is sized right and no circuit is pulling more than its breaker allows.
Torque Screwdriver
Torques every lug and breaker terminal to the manufacturer spec. Loose lugs are the number one cause of warm panels and nuisance trips.
Voltage Tester
Confirms the panel is dead before we touch a conductor. Non-negotiable step after the utility pulls the meter.
Circuit Breaker Finder
Maps each circuit to its breaker so the panel label matches reality instead of a guess from the last homeowner.
Panel Knockout Punch
Cuts clean, round holes in the new enclosure for conduit and cable entries so the install looks factory, not hacked.
Fish Tape
Pulls new conductors through finished walls when a circuit needs to move to a different breaker position during the swap.
NEC Load Calculation
We size the panel to your square footage and major appliances, not to a rule of thumb. That is how we know whether 125 amps covers you or whether a 200 amp service is the right call for an EV charger and a heat pump.
NEC Code Compliance
Grounding, bonding, conductor sizing, and working clearances all follow the current NEC. We install to code because the inspector will check, and because code exists for reasons that show up in real fires.
UL Listed Equipment Only
Every panel, breaker, and surge device we install carries a UL listing. Off-brand gear saves money up front and costs more when a breaker fails and the replacement part is discontinued.
OSHA Safety Standards
Lockout, meter pull coordination with the utility, and PPE on every job. Panel work is high-voltage work, and we treat it that way from the first disconnect to the final test.
01
What we do: We replace the fuse box with a 200 amp breaker panel, re-land the existing circuits, and correct the grounding to NEC code compliance. Where knob-and-tube feeds a bedroom or kitchen, we quote that correction separately so you see the full picture before we start.
→ The home passes inspection, the insurer signs off, and there is capacity for a future kitchen remodel without another service change.
02
What we do: We upgrade to a 200 amp panel, install a dedicated 60 amp breaker for the charger, and run the circuit in conduit to the garage. Permit and inspection are handled in the same visit as the panel swap.
→ The charger runs at full rate without tripping the main, and the panel has spare spaces for a heat pump later.
03
What we do: We diagnose with a clamp meter and find corroded lugs and a failing main breaker. The panel gets replaced with a Square D enclosure, all lugs torqued to spec, and a whole-home surge device added.
→ Flickering stops, the panel runs cool, and the surge device protects the appliances from the next storm-related power surge.
San Mateo has a housing mix that shapes every panel job we do. Pre-war bungalows in the 94401 and 94402 ZIP codes often still have 60 or 100 amp services with original feeders, while mid-century tracts in the 94403 flats were built for a fraction of today's load. Coastal fog off the Bay corrodes aluminum lugs and bus bars faster here than inland, which is why we see so many warm panel covers and intermittent trips on the west side. The city requires an electrical permit and inspection on every panel replacement, and we handle both. If you are weighing electrical panel replacement cost San Mateo against patching the old panel again, remember that a new panel is a one-time cost and a failing panel is an ongoing risk. We quote the full scope in writing, including any feeder or grounding corrections we find once the old enclosure is out.
Beresford Park
Mostly 1940s and 1950s homes with original 60 amp services. Panel replacement here usually includes bringing the grounding up to code and correcting a few knob-and-tube branches.
Hayward Park
Mix of mid-century homes and newer infill. We see a lot of 100 amp panels that are full, with homeowners adding EV chargers and needing a 200 amp upgrade.
Bay Meadows
Newer townhomes where the original panel is fine but has no open slots. A subpanel or a main upgrade is usually the right answer for an EV charger here.
Downtown San Mateo
Older commercial-adjacent residential stock with tight meter rooms. Panel swaps here need careful coordination with the utility disconnect window.
Shoreview
Closer to the Bay, so corrosion on lugs and bus bars shows up earlier. We inspect and torque every connection on these jobs and often add a surge device.
Coastal fog and salt air near the Bay
Accelerates corrosion on aluminum lugs and bus bars, which causes resistance, heat, and nuisance trips. We see it most in Shoreview and the low-lying flats.
Pre-war housing stock with original feeders
Many 1920s to 1950s homes still have undersized service entrance conductors. A panel swap often means upgrading the feeder too, which we quote before we start.
City permit and inspection requirement
Every panel replacement in San Mateo needs an electrical permit and a passed inspection. We file it, meet the inspector, and hand you the signed card.
Winter storm surges off the Peninsula
Storm-related power surges stress older panels. We recommend a whole-home surge device on every replacement so the next storm has somewhere safe to dump its energy.
Most panel calls start with a symptom, not a diagnosis. Here are the ones we hear most from San Mateo homeowners and what is usually behind them.
Problem
You cannot run the dryer and the microwave at the same time, and the nuisance trips get worse every year as the panel ages.
Our Fix
We run a load calculation, confirm whether the panel is undersized or the connections are loose, and either repair the failing breaker or replace the panel with one sized for your actual load. Most homes land on a 200 amp service.
Problem
Warmth at the panel means resistance, and resistance means heat. Left alone, loose lugs and corroded connections are a fire risk, not a nuisance.
Our Fix
We shut the panel down, inspect every lug and bus bar connection, and torque to spec with a torque screwdriver. If corrosion from coastal moisture has reached the bus bar, replacement is the safe call and we tell you that straight.
Problem
Carriers increasingly refuse to insure homes with screw-in fuse panels, and a failed inspection can stall a sale or refinance.
Our Fix
We replace the fuse box with a modern breaker panel, re-land the existing circuits, and bring grounding up to code. You get the signed inspection card that satisfies the insurer and the buyer's inspector.
Problem
Every slot in the panel is full, and adding a Level 2 charger on a 100 amp service would trip the main breaker under normal household load.
Our Fix
We upgrade to a 200 amp panel with dedicated spaces for the charger circuit, run the new run in conduit, and pull the permit so the charger install is covered under the same inspection.
A new panel is not cosmetic. It is the difference between a house that trips every time the oven and microwave run together and one that carries the load without complaint.
Capacity for EV Chargers
A Level 2 EV charger pulls 40 to 48 amps continuous. On an outdated 100 amp service that is a recipe for nuisance trips. We size the new panel and main breaker so your charger, dryer, and range can run at once without tripping circuit breakers.
Ends Nuisance Tripping
If your breakers trip when the AC starts, the panel is either undersized or the connections are loose. A breaker panel replacement San Mateo gives you fresh lugs, a clean bus bar, and breakers rated for the actual load on each circuit.
Passes Inspection Cleanly
We pull local building permits and install UL listed equipment that meets NEC code compliance. When the inspector signs off, you have documentation that matters at resale and a panel that will not flag during a home inspection.
Protects Against Surges
Storm-related power surges and coastal moisture corrode old aluminum lugs and bus bars. A modern panel with proper grounding and a whole-home surge device gives surges somewhere safe to go instead of through your appliances.
Google ★★★★★4.9
Replaced our 1950s fuse box with a 200 amp panel and handled the permit and inspection. Clean work, labeled every breaker, and the price matched the quote. Highly recommend for anyone in San Mateo needing a panel swap.
Yelp ★★★★★4.8
Called on a Sunday with a warm panel and a main breaker that would not reset. They had someone out in under two hours, made it safe, and came back Monday for the replacement. Straight answers, no upselling.
BBB ★★★★★5.0
Upgraded our panel for an EV charger and ran the circuit in conduit to the garage. Passed inspection first try. They explained the load calculation and why 200 amps was the right call instead of just quoting the biggest number.
Google ★★★★★4.9
Coastal fog had corroded the lugs in our old panel and we were getting flickering lights. They replaced the panel, torqued everything to spec, and added a surge device. Six months later, zero issues.
Real answers to the questions we hear most often from local homeowners and property managers.
Not every panel needs to come out. If you have a single tripping breaker, a warm cover, or a loose lug, we diagnose it with a clamp meter and repair what is actually failing. If the panel is past saving, we credit the diagnostic toward replacement.
View Electrical Panel RepairThe most common size we install for San Mateo homes adding an EV charger or a heat pump. A 200 amp service gives you room for a 48 amp charger, an electric range, and a dryer running at once, with spare spaces for future circuits.
View 200 Amp Panel UpgradeOlder San Mateo homes still running screw-in fuses cannot support modern loads and often fail insurance inspections. We replace the fuse box with a breaker panel, re-land the existing circuits, and bring the grounding up to NEC code compliance.
View Fuse Box ReplacementDetached garages, ADUs, and workshop additions often need their own panel. We run the feeder, set the subpanel, and separate the neutral and ground bars correctly so the subpanel passes inspection alongside your main service work.
View Subpanel Installation & UpgradesCall (650) 372-5030 or email [email protected] and we will get you on the schedule. We answer the phone Monday through Friday, 8am to 6pm, and we run emergency panel calls 24/7. Same-day estimates are standard. If your panel is warm or a breaker will not reset, call now rather than waiting.
Phone
+16503725030Address
7 37th Ave, San Mateo, CA 94403, USA
Hours
Mon–Fri: 7AM – 7PM
Sat: 8AM – 4PM
Sun: Emergency Only
24/7 Emergency Available
