Thornton Electric
Company Overview
Our team offers high-quality electrical services in San Mateo, CA. With more than 40 years of expertise, we serve both home and business clients with reliable options.
Here’s what we offer:
* 24-Hour Emergency Electrical Services: Quick, radio-dispatched help for critical issues.
* Upgrades and Repairs for Electrical Panels: Professional service for circuit breakers, fuses, and complete replacements.
* Troubleshooting and Installation of Computer Circuits: Installation and maintenance to ensure smooth tech functionality.
* Tenant Improvements for Businesses: Electrical upgrades for commercial spaces and new buildings.
* Inspections and Preventive Maintenance: Identify and address issues before they grow.
This year, we celebrate 34 years in business. As a local business, we employ long-term staff committed to our goals.
Thornton Electric has proudly served the Peninsula for three decades. Feel free to visit our office if you’re nearby.
Business Services
- Circuit breaker installation
- Circuit breaker repair
- Doorbell installation
- Doorbell repair
- Electric inspection
- Electric installation or replacement
- Electric panel installation
- Electric panel repair
- Electric repair
- Wire installation
- Wire repair
- Electric vehicle charging station installation
- Generator installation
- Light fixture installation
- Light fixture repair
- Outlet installation
- Outlet repair
Business Location & Hours
Mon: | 7:00 AM - 5:00 PM |
Tue: | 7:00 AM - 5:00 PM |
Wed: | 7:00 AM - 5:00 PM |
Thu: | 7:00 AM - 5:00 PM |
Fri: | 7:00 AM - 5:00 PM |
Sat: | 7:00 AM - 5:00 PM |
Sun: | Closed |
Recommended Customer Reviews

I had spent $200 on another electrician found on CL (he was licensed). My circuit breaker kept going off,for which he just switched a fuse from an unused circuit to the one powering my kitchen/dining room. This took him about 15mins.and he didn't even bother using a new fuse! The same issue recurred after a couple of weeks when I found Thornton Electric and spent the same amount of money for Dave to do a thorough assessment of my home.He said that possibly my old outdoor porchlight (which was getting loose) might be causing the short circuiting due to rain etc . I changed the porchlight and did not have another short circuit occur. Dave is very professional and really knows what he is doing. When I had to reschedule, their office staff was very prompt in replying .I've also spoken to Randy, the owner, who is very attentive and wants his customers satisified. I highly recommend this company to those needing expert, professional electrical work.

I have had work done with Thornton in the past, and was happy with the quality of the work, but was very disappointed to have them give me a bid for a small project that came in $5500 over what I ended up paying someone else to do. I wasn't given adequate itemization about labor and parts when requested, and as a result feel as if the company was trying to take advantage. Happy to have found a better option, but be sure you get multiple bids before you use them!

These guys are amazing. The best attitude and the best service. We use Randy and his crew for our corporate events and I use him for my personal use. Clean, efficient, priced fairly, etc. Can't say enough good things.
Gig X

Great experience, start to finish. I had a badly wired overhead fixture that failed over the weekend in strange ways. Randy gave me excellent phone advice Saturday at no cost about what my options were, and what stuff to buy so that a repair Monday morning could be done quickly and at a reasonable cost. Dave arrived on time and took care of everything on site. Both of them were knowledgeable, friendly and very attuned to figuring out what would work best for us.
I called a half-dozen electrical firms on that Saturday, looking for guidance. Thornton was the one place that actually wanted to solve customers' problems, instead of just capturing email and phone data for later marketing use. Good guys!

Very happy with the project Randy and his team did for us. Quick turnaround on the quote, followed by quickly getting permits and PG&E stuff sorted out. They completed the installation of our new electric car charger quickly (with very short power down time) and with great quality. Very attentive and courteous, we felt well taken care off.

The workers arrived at the job on time. I was impressed and they took time out to discuss the job before they started working. On the first day they replaced my electrical service panel, and restored my power. Next day thay came back to do the detail work, and also talk to the electrical inspector, everything passed inspection. I'm very happy with the job, I recommend them for your job, big or small.

I hired Thornton to install a new service panel 6 years ago when I bought my house in San Mateo. I hired them again last week to wire my garage and install overhead shop lighting. They did an excellent job on both projects. Super clean & high quality finished product. The electrician showed up on time, gave me good design advice and finished the project on time. I highly recommend them.
Frank
San Mateo

My family has been doing business with Randy of Thornton Electric for over 30 years on all of our rental properties. Day or night, rain or shine, we have counted on them for our electrical problems. We trust Thornton Electric so much, they have the keys to all of our properties. Recently they replaced the main panel at one of our apartments and even the tenants told us the electricians were very nice and helpful. We hope to use Thornton Electric for the next 30 years as well.

My advice to all...Before doing business with Thornton, make sure you have ALL estimates in writing. When you agree to have additional work done, have a contract in writing. Check all work to make sure you get what you paid for. You'll thank yourself and protect your wallet!!!!

I rate these guys well after they helped us in a pinch. So I called them again when our bathroom fan started sparking. The guy can out and disconnected the light in the fan and said he would order the replacement part and get back to us. This cost $275. Then he never called back. So instead of paying their mark up for the part and another expensive service charge, I just ordered the part myself and fixed the problem. If you are going to charge so much, it would be good to make sure the job is done.