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Find Electrical wiring or panel upgrade pros in Rockville

Avatar for Mark H. Anderson Electrical Services, Inc.

Mark H. Anderson Electrical Services, Inc.

4.84(
372
)
Approved Pro

Mark H. Anderson Electrical Services, Inc.

4.84(
372
)
Approved Pro
Customers say: True professional
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
36 years of experience

Established in 1990, Mark H. Anderson continues to lead the competition within the Baltimore and surrounding areas. Your home is your castle and you don't take that investment lightly, neither do I. For over sixteen years, discriminating homeowners have looked to Mark H. Anderson for their electrical needs. Our one on one service is our dedication to your vision. Mark H. Anderson Electric prides themselves on an outstanding record of quality service and attention to detail. The foundation of our company has been built by satisfied clients giving us the name of their business associate, neighbor, or friends. Our philosophy is to treat your home as we would our own, and this is complimented by our unprecedented standing within the industry. Our reputation is a testament to the level of service and quality of result you'll get and can expect when you choose Mark H. Anderson for your electrical needs: Experienced: We are experienced in the residential electrical sector. Our company has satisfied customers throughout the metro area. Ask our customers, and they will tell you that there is nothing we can not do when it comes to electrical service. Qualified: Our high quality of experience allows us to quickly determine what the problem is and fix it quickly and safely. Dependable: We are prompt and on time. You will not be left waiting! Honest: We will find the problem and fix it fast! And we will always provide you with the lowest price possible. Neat: We never leave a mess. After our work is done, we do the cleaning. References: We provide customer references upon request, so just ask us. In fact, we will be glad to provide you with proof of our own Maryland Electrical Licenses.

"Response to request was almost immediate and followed up with a phone. He was on time and completed the project in a timely manner. He was knowledgeable and vey polite."

Philomina C on January 2025

Established in 1990, Mark H. Anderson continues to lead the competition within the Baltimore and surrounding areas. Your home is your castle and you don't take that investment lightly, neither do I. For over sixteen years, discriminating homeowners have looked to Mark H. Anderson for their electrical needs. Our one on one service is our dedication to your vision. Mark H. Anderson Electric prides themselves on an outstanding record of quality service and attention to detail. The foundation of our company has been built by satisfied clients giving us the name of their business associate, neighbor, or friends. Our philosophy is to treat your home as we would our own, and this is complimented by our unprecedented standing within the industry. Our reputation is a testament to the level of service and quality of result you'll get and can expect when you choose Mark H. Anderson for your electrical needs: Experienced: We are experienced in the residential electrical sector. Our company has satisfied customers throughout the metro area. Ask our customers, and they will tell you that there is nothing we can not do when it comes to electrical service. Qualified: Our high quality of experience allows us to quickly determine what the problem is and fix it quickly and safely. Dependable: We are prompt and on time. You will not be left waiting! Honest: We will find the problem and fix it fast! And we will always provide you with the lowest price possible. Neat: We never leave a mess. After our work is done, we do the cleaning. References: We provide customer references upon request, so just ask us. In fact, we will be glad to provide you with proof of our own Maryland Electrical Licenses.

"Response to request was almost immediate and followed up with a phone. He was on time and completed the project in a timely manner. He was knowledgeable and vey polite."

Philomina C on January 2025


Avatar for One Source, LLC

One Source, LLC

5.00(
5
)
Approved Pro

One Source, LLC

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

One Source Systems is one of the premier custom integrators in the greater Washington D.C. area. We are focused on an elevated client experience and meeting your needs for Smart Home design, including experiential elements such as lighting, shades and incredible dedicated theater and Audio/Video solutions. With over 10 years of experience in the audio industry, we are the experts you need to take care of your home or business. We will treat your home as we would treat our own. Give One Source a call today - we look forward to working with you!

"They stayed all day arriving at like 10:00am to get the job done and didn’t leave until like 11:30pm"

Steve B on July 2021

One Source Systems is one of the premier custom integrators in the greater Washington D.C. area. We are focused on an elevated client experience and meeting your needs for Smart Home design, including experiential elements such as lighting, shades and incredible dedicated theater and Audio/Video solutions. With over 10 years of experience in the audio industry, we are the experts you need to take care of your home or business. We will treat your home as we would treat our own. Give One Source a call today - we look forward to working with you!

"They stayed all day arriving at like 10:00am to get the job done and didn’t leave until like 11:30pm"

Steve B on July 2021


Avatar for DELTA Electric, LLC

DELTA Electric, LLC

5.00(
2
)
Approved Pro

DELTA Electric, LLC

5.00(
2
)
Approved Pro
5 years of experience
Free onsite estimate

We take great pride our experience, expertise, quality, and customer service that we provide to meet the consumer need. 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.

We take great pride our experience, expertise, quality, and customer service that we provide to meet the consumer need. 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.


"Jah came and did an amazing job on the lights in our family room. He?s very well mannered and really works with you on anything you need done!m. Definitely would hire again! "

Allyson D on January 2026

369 Electric

"Jah came and did an amazing job on the lights in our family room. He?s very well mannered and really works with you on anything you need done!m. Definitely would hire again! "

Allyson D on January 2026


Avatar for Green Light Electrical Contractors

Green Light Electrical Contractors

5.00(
4
)
Approved Pro

Green Light Electrical Contractors

5.00(
4
)
Approved Pro
Super Service Award
9 years of experience

When you call GLEC, you get a master electrician providing you the highest quality work at a fraction of the cost. You are losing out big time when calling a large electrical company! They will send an unqualified employee, and you will pay the overhead for them to learn on your property. We at Green Light Electrical Contractors strive to maintain our reputation as a high quality, very service oriented company with our main focus being customer satisfaction.

"We had a great experience with Ryan. He called us right away after our inquiry and was able to come out the very next day to install wiring for our sauna and a new light switch. He was efficient, professional, and did an excellent job — everything works perfectly and looks great. Highly recommend!"

ashley a on November 2025

When you call GLEC, you get a master electrician providing you the highest quality work at a fraction of the cost. You are losing out big time when calling a large electrical company! They will send an unqualified employee, and you will pay the overhead for them to learn on your property. We at Green Light Electrical Contractors strive to maintain our reputation as a high quality, very service oriented company with our main focus being customer satisfaction.

"We had a great experience with Ryan. He called us right away after our inquiry and was able to come out the very next day to install wiring for our sauna and a new light switch. He was efficient, professional, and did an excellent job — everything works perfectly and looks great. Highly recommend!"

ashley a on November 2025


"They were on time and the job was done fast with highest quality and at a very reasonable price. They were friendly and professional. They installed a panel and generator for me and replaced some old wiring around the house. Recommend them to all."

Amin M on August 2020

detail service

"They were on time and the job was done fast with highest quality and at a very reasonable price. They were friendly and professional. They installed a panel and generator for me and replaced some old wiring around the house. Recommend them to all."

Amin M on August 2020


Avatar for Three Brothers Services, LLC

Three Brothers Services, LLC

4.97(
57
)
Approved Pro

Three Brothers Services, LLC

4.97(
57
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
17 years of experience

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We have many years of experience to give you confidence that we are your number one choice for your next home project. You will find us to be competitively priced with close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction! Licensed & Bonded Maryland Home Improvement #141947 Maryland Master Electrician #14130 Virginia Master Electrician #2710073038

"Three Brothers is the best. We have hired Saul and team for several electrical projects both big and small over the past few years. They have never disappointed. Highly recommend for any electrical needs."

David G on July 2023

We are a locally owned and operated company that values honesty and integrity and treats your home as if it were our own. We have many years of experience to give you confidence that we are your number one choice for your next home project. You will find us to be competitively priced with close attention to the details of each and every project that we are involved with. We look forward to building lasting relationships and guarantee your satisfaction! Licensed & Bonded Maryland Home Improvement #141947 Maryland Master Electrician #14130 Virginia Master Electrician #2710073038

"Three Brothers is the best. We have hired Saul and team for several electrical projects both big and small over the past few years. They have never disappointed. Highly recommend for any electrical needs."

David G on July 2023


Avatar for Lemus Electrical Services LLC

Lemus Electrical Services LLC

5.00(
19
)
Approved Pro

Lemus Electrical Services LLC

5.00(
19
)
Approved Pro
Super Service Award
Customers say: Quick response
Recommended by 94% of Angi customers
Recommended by 94% of HomeAdvisor customers
Free onsite estimate

Lemus Electrical Services LLC. We are a family company with 10 years of experience in the electrical market, which gives us the experience to be able to carry out all residential and commercial electrical work. For us there is no such thing as a small job, we put the same passion and professionalism into each job we do because we are sure that it is the basis for maintaining an excellent relationship with our clients. Best regards, Julio L. (Owner)

"Great communication before and during the project. Ceiling fan and motion light look great. Definitely recommend them"

marilyn b on November 2025

Lemus Electrical Services LLC. We are a family company with 10 years of experience in the electrical market, which gives us the experience to be able to carry out all residential and commercial electrical work. For us there is no such thing as a small job, we put the same passion and professionalism into each job we do because we are sure that it is the basis for maintaining an excellent relationship with our clients. Best regards, Julio L. (Owner)

"Great communication before and during the project. Ceiling fan and motion light look great. Definitely recommend them"

marilyn b on November 2025


Avatar for Hands on Electric

Hands on Electric

5.00(
11
)
Approved Pro

Hands on Electric

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

Experienced, quality and affordable Electricians servicing the Washington, DC. Metro Area. We offer same day service, 24 hour emergency service, and free estimates. No job is too small, we are troubleshooting experts, our services include but not limited to, generators, panel upgrades, ceiling fan installation, outlet replacement, track lighting, security lighting, recess lighting, appliance wiring, exterior lighting, pool & hot tub wiring, exhaust fans and much more.

"Kevin Williams was sent to repair problems created by another electrician hired by Kitchen Saver during an expansive kitchen re-face and cabinet installation. Among other things, he re-located an unsightly transformer that had been previously secured to the inside of the first shelf of a main kitchen cabinet to a lower cabinet out of sight. Voila! Then, he re-routed unsightly wiring previously clamped to the far corner of a glass display cabinet so that it was out of sight. These were difficult puzzles to solve, as the new cabinets had already been installed and there was no longer easy access. Kevin was friendly, professional, and experienced! Great job!"

NINA A on August 2022

Experienced, quality and affordable Electricians servicing the Washington, DC. Metro Area. We offer same day service, 24 hour emergency service, and free estimates. No job is too small, we are troubleshooting experts, our services include but not limited to, generators, panel upgrades, ceiling fan installation, outlet replacement, track lighting, security lighting, recess lighting, appliance wiring, exterior lighting, pool & hot tub wiring, exhaust fans and much more.

"Kevin Williams was sent to repair problems created by another electrician hired by Kitchen Saver during an expansive kitchen re-face and cabinet installation. Among other things, he re-located an unsightly transformer that had been previously secured to the inside of the first shelf of a main kitchen cabinet to a lower cabinet out of sight. Voila! Then, he re-routed unsightly wiring previously clamped to the far corner of a glass display cabinet so that it was out of sight. These were difficult puzzles to solve, as the new cabinets had already been installed and there was no longer easy access. Kevin was friendly, professional, and experienced! Great job!"

NINA A on August 2022


Avatar for TriState Home Services

TriState Home Services

4.73(
181
)
Approved Pro

TriState Home Services

4.73(
181
)
Approved Pro
Customers say: Super punctual
Recommended by 91% of Angi customers
Recommended by 91% of HomeAdvisor customers
66 local quotes requested

If you are looking for a HVAC Contractor, a Plumbing Contractor, or an Electrical Contractor to provide you with great service, you've come to the right place. We provide heating services, air conditioning services, plumbing services, and electrical services to our customers in Frederick and the surrounding Counties, the Pan Handle of West Virginia, and Northern Virginia, from our offices located in Frederick MD. With 3 generations of experience in providing heating, air conditioning, plumbing, and electrical services, we are dedicated to providing the best possible products and services for you, and your family.

"Great service very prompt and easy to work with."

Randy W on May 2025

If you are looking for a HVAC Contractor, a Plumbing Contractor, or an Electrical Contractor to provide you with great service, you've come to the right place. We provide heating services, air conditioning services, plumbing services, and electrical services to our customers in Frederick and the surrounding Counties, the Pan Handle of West Virginia, and Northern Virginia, from our offices located in Frederick MD. With 3 generations of experience in providing heating, air conditioning, plumbing, and electrical services, we are dedicated to providing the best possible products and services for you, and your family.

"Great service very prompt and easy to work with."

Randy W on May 2025

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FAQs for electrical wiring or panel upgrade projects in Rockville, MD

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 Rockville, MD 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.