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Find Electrical wiring or panel upgrade pros in Diamond Bar

Avatar for M J Prime Electric Incorporated

M J Prime Electric Incorporated

5.00(
4
)
Approved Pro

M J Prime Electric Incorporated

5.00(
4
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
11 years of experience

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

"Excellent workmanship and always on time."

Rosemary L on June 2022

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

"Excellent workmanship and always on time."

Rosemary L on June 2022


Avatar for Quacom Electric LLC

Quacom Electric LLC

4.95(
11
)
Approved Pro

Quacom Electric LLC

4.95(
11
)
Approved Pro
Customers say: Quality work
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
3 years of experience

Quacom Electric LLC is a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have over 12 years of hands-on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with.

"Ben was always on time and extremely efficient. He handled all permits with the city and made sure his work was signed off by the city. My Homeowners Insurance was pleased with the result and agreed to continue my Homeowner Insurance coverage. What a relief. Many thanks for such excellently work. "

Linda S on September 2025

Quacom Electric LLC is a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have over 12 years of hands-on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with.

"Ben was always on time and extremely efficient. He handled all permits with the city and made sure his work was signed off by the city. My Homeowners Insurance was pleased with the result and agreed to continue my Homeowner Insurance coverage. What a relief. Many thanks for such excellently work. "

Linda S on September 2025


Avatar for Accurate Electric, Plumbing, Heating and Air

Accurate Electric, Plumbing, Heating and Air

4.78(
11
)
Approved Pro

Accurate Electric, Plumbing, Heating and Air

4.78(
11
)
Approved Pro
Customers say: Quick response
26 local quotes requested
26 years of experience

Please see our Special Offers and Promotions, for a limited time only! We service the San Gabriel valley. Owner Jeff Seale has been in the electrical field since 1989. When he was starting out, he witnessed other electricians who were not focused on customer service. They either didn’t complete the work correctly or they charged customers for work that was unnecessary. Jeff believed that customers deserved electrical service that was both dependable and professional. Accurate, born out of the need for committed excellence and communication. We pride ourselves on an outstanding record of quality service. Our experience is testament to the level of service and quality you'll get when you choose Accurate for your electrical needs. We have a staff of highly talented and motivated individuals that are eager to help you with all of your electrical needs. We are excited you have expressed an interest in our services! We look forward to working with you.

"I needed to upgrade the electrical panel in my home and I didn't know who to trust. I did lots of research and found Accurate, and I am glad I did! They made the process super easy and put my mind at ease. In fact, I even had them install a Whole Home Fan at the same time. They sent me text messages when the tech was on his way with his photo and bio, so I knew who was coming to my home. Kenny was the lead with Q and Gabe helping. They were very patient and informative, answering my hundreds of questions. They kept me in the loop with all their findings and did a great job on both installs. Even the process of applying for financing was super easy! I am so happy with Accurate and plan on using them for all my home issues in the future!"

Katie _ on October 2025

Please see our Special Offers and Promotions, for a limited time only! We service the San Gabriel valley. Owner Jeff Seale has been in the electrical field since 1989. When he was starting out, he witnessed other electricians who were not focused on customer service. They either didn’t complete the work correctly or they charged customers for work that was unnecessary. Jeff believed that customers deserved electrical service that was both dependable and professional. Accurate, born out of the need for committed excellence and communication. We pride ourselves on an outstanding record of quality service. Our experience is testament to the level of service and quality you'll get when you choose Accurate for your electrical needs. We have a staff of highly talented and motivated individuals that are eager to help you with all of your electrical needs. We are excited you have expressed an interest in our services! We look forward to working with you.

"I needed to upgrade the electrical panel in my home and I didn't know who to trust. I did lots of research and found Accurate, and I am glad I did! They made the process super easy and put my mind at ease. In fact, I even had them install a Whole Home Fan at the same time. They sent me text messages when the tech was on his way with his photo and bio, so I knew who was coming to my home. Kenny was the lead with Q and Gabe helping. They were very patient and informative, answering my hundreds of questions. They kept me in the loop with all their findings and did a great job on both installs. Even the process of applying for financing was super easy! I am so happy with Accurate and plan on using them for all my home issues in the future!"

Katie _ on October 2025


Avatar for Granny Electric

Granny Electric

4.55(
10
)
Approved Pro

Granny Electric

4.55(
10
)
Approved Pro
Customers say: True professional
Recommended by 90% of Angi customers
Recommended by 90% of HomeAdvisor customers
14 years of experience

Granny Electric is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests, and make their concerns the basis of our business.

"Keeping this guys card!"

Wendy K on May 2024

Granny Electric is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests, and make their concerns the basis of our business.

"Keeping this guys card!"

Wendy K on May 2024


JMX ELECTRICAL INC

5.00(
1
)
Approved Pro

JMX ELECTRICAL INC

5.00(
1
)
Approved Pro
17 years of experience
Free onsite estimate

At JMX ELECTRICAL INC we pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

"Jose was very professional and is knowledgeable about what needs to be done. He was able to install a ceiling light fan in my bedroom. After installation, he cleaned up as well which was much appreciated. I had a recent incident in my kitchen with an air fryer that caught on fire and I was concerned about the power from that receptacle, I called Jose and he came over that same day to check if there was any work that needed to be done, luckily everything was fine and he told me no work needs to be done. Jose is honest and I will definitely be calling JMX Inc. for electrical needs. I highly recommend them."

Roma P on January 2026

At JMX ELECTRICAL INC we pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

"Jose was very professional and is knowledgeable about what needs to be done. He was able to install a ceiling light fan in my bedroom. After installation, he cleaned up as well which was much appreciated. I had a recent incident in my kitchen with an air fryer that caught on fire and I was concerned about the power from that receptacle, I called Jose and he came over that same day to check if there was any work that needed to be done, luckily everything was fine and he told me no work needs to be done. Jose is honest and I will definitely be calling JMX Inc. for electrical needs. I highly recommend them."

Roma P on January 2026


S&W Electric Company

New on HomeAdvisorNew on HomeAdvisor
Approved Pro

S&W Electric Company

New on HomeAdvisorNew on HomeAdvisor
Approved Pro
6 years of experience
Free onsite estimate

We work extremely hard for the owner and our company strives to take care of all our client's unique needs and always have the owner's best interest at heart. We are very detailed and meticulous in our work.  Our long-term vision is for us to become your go to Contractor with capabilities to do multiple types of projects.  Call us today you'll be relieved you did. Thank you

We work extremely hard for the owner and our company strives to take care of all our client's unique needs and always have the owner's best interest at heart. We are very detailed and meticulous in our work.  Our long-term vision is for us to become your go to Contractor with capabilities to do multiple types of projects.  Call us today you'll be relieved you did. Thank you


Avatar for K H Gillette Electrical & Lighting

K H Gillette Electrical & Lighting

5.00(
5
)
Approved Pro

K H Gillette Electrical & Lighting

5.00(
5
)
Approved Pro
Customers say: Quick response
28 years of experience
Free onsite estimate

we take great pride in our experience, expertise, quality and customer service that we provide to meet the consumers needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety and quality, regardless of how large or small the job.

"Kevin responded quickly to my call, came on time, was friendly, neat, explained the job, provided pricing upfront and completed project. I will definitely use KH Gillette Electrical again and would highly recommend."

Gail D on March 2025

we take great pride in our experience, expertise, quality and customer service that we provide to meet the consumers needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety and quality, regardless of how large or small the job.

"Kevin responded quickly to my call, came on time, was friendly, neat, explained the job, provided pricing upfront and completed project. I will definitely use KH Gillette Electrical again and would highly recommend."

Gail D on March 2025


Avatar for Mr. Electric of Ontario

Mr. Electric of Ontario

5.00(
10
)
Approved Pro

Mr. Electric of Ontario

5.00(
10
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
14 local quotes requested

Whether you need electrical services for your Riverside County business or home, Mr. Electric of Ontario has the perfect solution. From installation to upgrades, we do it all. Contact Mr. Electric to make your life easier and your pockets fuller. We take pride in serving local businesses and neighbors. Workmanship guaranteed. Prompt reply to your request. Residential and commercial projects welcome. Call us today @ 951-446-0064.

"The person who installed my ev charger really know what he’s doing and did good job. Great customer service."

Jhunne C on March 2024

Whether you need electrical services for your Riverside County business or home, Mr. Electric of Ontario has the perfect solution. From installation to upgrades, we do it all. Contact Mr. Electric to make your life easier and your pockets fuller. We take pride in serving local businesses and neighbors. Workmanship guaranteed. Prompt reply to your request. Residential and commercial projects welcome. Call us today @ 951-446-0064.

"The person who installed my ev charger really know what he’s doing and did good job. Great customer service."

Jhunne C on March 2024


Avatar for Trinity Electric

Trinity Electric

5.00(
2
)
Approved Pro

Trinity Electric

5.00(
2
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
12 years of experience

TRINITY ELECTRIC is committed to excellence every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business

"Highly recommend, honest, great quality, very good at what he does, and great with people."

Steve X on April 2020

TRINITY ELECTRIC is committed to excellence every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business

"Highly recommend, honest, great quality, very good at what he does, and great with people."

Steve X on April 2020


D & J Lighting Maintenance

4.64(
55
)
Approved Pro

D & J Lighting Maintenance

4.64(
55
)
Approved Pro
Customers say: Quality work
42 years of experience

D & J Lighting Maintenance is a locally owned and operated business! We are servicing the Riverside Orange county area! We will travel for bigger projects! Call us for your free estimates! We will also perform commercial work as well! Ask us as we know the answers and our projects are perfected! Call me for free estimates!

"On time. Fair pricing and was able to do some extra work as well as the preplanned stuff."

Larry L on May 2025

D & J Lighting Maintenance is a locally owned and operated business! We are servicing the Riverside Orange county area! We will travel for bigger projects! Call us for your free estimates! We will also perform commercial work as well! Ask us as we know the answers and our projects are perfected! Call me for free estimates!

"On time. Fair pricing and was able to do some extra work as well as the preplanned stuff."

Larry L on May 2025

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FAQs for electrical wiring or panel upgrade projects in Diamond Bar, CA

While homeowners with substantial electrical knowledge might technically attempt a subpanel installation, most local building departments require permits and inspections for this type of work. Professional electricians understand local code requirements, can obtain necessary permits, and ensure the installation meets safety standards. Given the significant safety risks associated with incorrect electrical work, most homeowners benefit from hiring a licensed professional.

A standard subpanel installation takes an average of four to eight hours. This timeframe may extend if you're installing multiple subpanels or adding specialized circuits like those for spa equipment. Factors such as difficult access points, complex wiring paths, or permit processing times can also affect the overall project duration.

Adding a subpanel doesn't directly reduce electricity consumption or lower your utility bills. A subpanel simply redistributes power from your main panel to additional circuits. However, organizing your electrical system more efficiently may help prevent overloaded circuits and the associated problems. For actual cost savings, consider energy-efficient appliances and lighting instead.

The appropriate subpanel size depends on your specific electrical requirements. Consider the number and type of devices you'll be powering, potential future needs, and the capacity of your main electrical panel. An electrician can perform a load calculation to determine the most suitable amperage rating for your situation, ensuring you have adequate power without overpaying for unnecessary capacity.

A main electrical panel connects directly to your utility's power supply and contains your home's primary service disconnect. It distributes electricity throughout your entire house. A subpanel, by contrast, receives power from the main panel and redistributes it to a specific area of your home. Think of the main panel as the primary distribution point and the subpanel as a secondary branch that extends your electrical system's reach.

While electrical upgrades aren't as immediately visible as kitchen or bathroom renovations, they can contribute to your home's functionality and safety. Prospective buyers often appreciate updated electrical systems that can accommodate modern power demands. A properly installed subpanel that provides additional capacity for workshops, home offices, or future expansions could be an attractive feature for certain buyers, though the direct impact on home value varies by market.

The Diamond Bar, CA homeowners’ guide to electrical wiring or panel upgrades

From average costs to expert advice, get all the answers you need to get your job done.