Residential
As homes rely more on technology and power, having a safe and reliable electrical system is essential. Our licensed electricians provide expert residential electrical services to keep your home running efficiently while preventing costly issues and electrical hazards. From repairs and upgrades to inspections, we help homeowners protect their property and peace of mind.
Commercial
As a trusted commercial electrician, Mario Castillo Electric helps businesses, property managers, and facility owners maintain safe, efficient, and code-compliant electrical systems. From installations and upgrades to troubleshooting and repairs, we reduce downtime and keep your operations running smoothly so you can focus on your business.
Solar
As a leading solar company, Mario Castillo Electric designs and installs high-performance solar systems for homes and businesses. We help you reduce energy costs, increase efficiency, and gain long-term energy independence with reliable solar solutions backed by expert electrical integration.
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We strive to be in contact communication with our customers until the job is done. We look forward to helping you!
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Prevent Downtime with Proactive Electrical Maintenance Programs
Unexpected electrical failures can disrupt operations, create safety risks, and lead to costly repairs. Mario Castillo Electric offers customized electrical maintenance programs designed for businesses, property managers, and commercial facilities that need reliable, long-term performance.
Our maintenance plans include routine inspections, preventive maintenance, and priority service to help you stay code compliant, reduce emergency repairs, and extend the life of your electrical systems. With a proactive approach, we help you avoid downtime and keep your property running efficiently.
High-Quality Commercial Electrical & Solar Services You Can Rely On
At Mario Castillo Electric, we deliver professional electrical and solar services for homes and commercial properties, focusing on safety, performance, and long-term reliability. Our licensed electricians work with homeowners, businesses, and property managers to handle everything from repairs and upgrades to complex electrical systems and energy-efficient solar installations.
We prioritize clear communication, code-compliant work, and dependable results on every project. As a fully licensed and insured electrical contractor, we help our clients reduce risk, improve efficiency, and ensure their electrical systems are built to last. When you work with our team, you gain a trusted partner committed to getting the job done right the first time.
Electrical, Solar & Commercial Services You Can Rely On
Our team is equipped to handle everything from minor residential repairs to large-scale commercial electrical projects and solar installations. We work with homeowners, businesses, and property managers to deliver safe, efficient, and code-compliant solutions tailored to each property.
From ongoing electrical maintenance programs to complex system upgrades, we are committed to exceeding expectations while maintaining the highest level of safety, reliability, and professionalism. Trust our experienced electricians to deliver results you can depend on.
Check out our Blog
Why Every Business Needs a Commercial Electrical Maintenance Program (Before It's Too Late)
Mar 23, 2026 | Commercial, Troubleshooting
Why Proactive Maintenance with Mario Castillo Electric Always Wins Power outages, electrical failures, and unexpected repairs aren’t just inconveniences for...
Read MoreThe Benefits of Upgrading Your Electrical Panel
Mar 10, 2026 | Panel Upgrade
When was the last time you thought about your home’s electrical panel? For many, it’s an overlooked yet crucial part...
Read MoreGrid-Tied Versus Off-Grid Solar for Commercial Buildings
Feb 16, 2026 | Commercial, Solar Energy
Rising energy costs, grid instability, and sustainability goals are pushing more businesses to explore solar power systems. For commercial properties,...
Read More
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Mario Castillo Electric Specials
Take advantage of our expertise to keep your home's electrical system running smoothly and safely with our money-saving offers. Contact us now to schedule your appointment.
10% Off
Any Job
Trust the experts at Mario Castillo Electric with your next electrical service. Note: offer does not apply to Panel Upgrade or electrical rewire jobs.
*Valid on services $250 or more. Must mention offer during estimate or time of service. Valid for new customers only. Cannot be combined with other offers.
$25 Off
Any Job
Enjoy quality services at affordable prices.
*Valid on services $250 or more. Must mention offer during estimate or time of service. Valid for new customers only. Cannot be combined with other offers.
$200 Off
Panel Upgrade
Keep your home safe from fire hazards with the most up-to-date panel for your home.
*Valid on services $250 or more. Must mention offer during estimate or time of service. Valid for new customers only. Cannot be combined with other offers.
Frequently Asked Questions About Our Electrical & Solar Services
Mario Castillo Electric is a trusted electrician, commercial electrician, and solar company serving homeowners and businesses throughout Long Beach, South Bay, and Orange County. We understand that electrical, solar, and maintenance services can raise a lot of questions, which is why we’ve compiled answers to some of the most common topics our clients ask about.
We accept a variety of payment options including e-checks/ACH payment, Venmo, Zelle, credit cards and checks.
Yes. We offer a great financing option through Wisetack that will allow you to pay month-to-month. Many of our customers have already been approved and used this service successfully.
If your home is 50 years old or older, you probably need to rewire your home. You might be noticing flickering or dimming lights that need to be changed regularly, breakers that trip frequently, and broken or cracked sockets. Also, if your outlets are not grounded, you don't have enough sockets and the fuse electrical panel is old, rewiring your home, is the solution.
There are many reasons. When many of these old houses were built, there was no such thing as a building code. Over the years, you may have worked hard to get your home up to code, but you never know what you may have missed. An electric inspection can help you determine if your home's electrical system is up to code and provide code corrections where needed.
A commercial electrician handles electrical systems for businesses, offices, retail spaces, and multifamily properties. This includes installations, upgrades, troubleshooting, and ensuring systems are safe, efficient, and up to code.
Yes. We offer customized electrical maintenance programs designed to help businesses prevent unexpected failures, reduce downtime, and stay code compliant. Our plans include routine inspections, preventive maintenance, and priority service.
Regular electrical maintenance helps identify potential issues before they become major problems. By addressing wear, outdated components, and code issues early, businesses can avoid costly disruptions and emergency repairs.
Yes. We work with property managers and multifamily property owners to provide reliable electrical services, maintenance, and upgrades that keep properties safe, compliant, and operating efficiently.
Yes. As both an experienced electrician and solar company, we provide complete electrical and solar solutions. This allows us to ensure proper system integration, long-term performance, and ongoing support.
South Bay and Orange County Communities We Serve
LA County / Southbay Cities:
Carson, Cerritos, Compton, Downey, Gardena, Harbor City, Hawaiian Gardens, Lakewood, Lomita, Long Beach, Norwalk, San Pedro, Signal Hill, Palos Verdes Peninsula, Torrance, Wilmington, Lynwood, Lawndale, La Mirada, Paramount, Artesia, Hawthorne, Willowbrook
Orange County Communities:
Rossmoor, Alamitos, Cypress, Seal Beach, Irvine, Buena Park, La Palma, Fullerton, Anaheim, Westminister, Stanton, Midway City, Orange, Garden Grove, Fountain Valley, Costa Mesa, Santa Ana, Newport Beach, Tustin/North Tustin, Huntington Beach, Villa Park, Placentia, Yorba Linda