Top-rated electricians.

Get matched with top electricians in Derwood, MD

Enter your zip and get matched with up to 5 pros

TRUSTED BY DERWOOD, MD HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon1.4k+
    Verified electrical services reviews

Find Electricians in Derwood

Avatar for NEC Electric
NEC Electric
4.9(
13
)

Serving Derwood, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2008

Free estimates

Emergency services offered

"not just professional efficient! Unbelievably fair priced literally less than half of what a major competitor on this site quoted using my own parts and my own wire! Just because there are any energy list doesn’t mean some people won’t try and rip you off and fools will pay it. Mr. NAGY is a professional and very ethical. I’d recommend hiring him again and again!"
Electrical Project
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+9

Response time2 days
Response rate93%
21 neighbors recently requested a quote
Avatar for Vital Electric
Vital Electric
5.0(
42
)

Serving Derwood, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2019

Free estimates

Emergency services offered

"I had a fantastic experience working with Ludwing from Vital Electric. He showed up right on time, which I really appreciated. From start to finish, his communication was clear and professional, keeping me informed at every step. I was also impressed by how neat and organized he kept his tools and truck—it’s a small detail that really reflects the pride he takes in his work. What stood out the most was Ludwing’s persistence in troubleshooting a tricky issue. He didn’t give up until everything was working perfectly. The price was very reasonable for the quality of service provided. I’d absolutely recommend Ludwing and Vital Electric to anyone looking for reliable, honest, and skilled electrical work."
Natural history museum
Island light
Island light
Additional Photos
Additional Photos

+8

Response time6 hrs
Response rate95%
Recommended by61%of homeowners
Green's Electric
5.0(
16
)

Serving Derwood, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2007

Free estimates

Emergency services offered

"I recently had an electrical issue in my bedroom and contacted Green's Electric and Plumbing. I was impressed by their prompt response and professionalism. They quickly diagnosed the problem and efficiently resolved it, ensuring the safety of my home. Their expertise and attention to detail were evident throughout the process. I highly recommend Green's Electric and Plumbing for any electrical needs. Thank you for the outstanding service!"
Response time1 day
25 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for Kolb Electric Inc
Kolb Electric Inc
4.2(
222
)

Serving Derwood, MD and surrounding areas

Approved

In business since 1925

Free estimates

Emergency services offered

"Very responsive, extremely knowledgeable, excellent problem solvers. They kind of really solved the mystery of why the generator didn't work that had to do with the electric."
Response time1 day
Response rate94%
7 neighbors recently requested a quote
Avatar for Bailey & Shipp Electric
Bailey & Shipp Electric
4.1(
82
)

Serving Derwood, MD and surrounding areas

Approved

In business since 2011

Free estimates

Emergency services offered

"Bailey Electric is the best electrical company that I have ever worked with. Everyone there is very respectful , professional , knowledgeable and willingness to help. These are reflections of the owner Personality and how they feel about their clients and staffing . Just good people all around. I own a Small Minority business in Maryland. They have support me more than anyone ever in my life. My business WOULD NOT be Successful without there help. All of my clients love them like I do. NO CALL BACK AFTER 3 YEARS THEY ARE FAMILY TO ME. BEST OF THE BEST I highly recommend them to everyone. UBU BAILEY ELECTRIC"
3 recessed lights
Single Recessed Light
Custom Bathroom Wiring
chandelier
Panel Replacement After

+8

Response time10 hrs
3 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for Hands on Electric
Hands on Electric
5.0(
11
)

Serving Derwood, MD and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"Kevin Williams was prompt and professional. He accommodated a last minute appointment for me when the electrician I normally use was unavailable. He called ahead to let me know when he would arrive, and even offered to arrive earlier if I wanted. He was knowledgeable, professional, and courteous. He was also very reasonably priced. I am glad I found him and plan to use his services again in the future."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+6

3 neighbors recently requested a quote
Recommended by100%of homeowners
Long Electric, LLC
4.9(
167
)

Serving Derwood, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2010

Free estimates

Customers say: Quality work

"From start to finish, Long Electric had our backs. We didn't have to hire sub-contractors or to obtain permits -- Long Electric took care of everything. Our go-to person in the main office, Melissa, answered all of our questions and kept us apprised of everything we needed to know. Everyone we had contact with throughout the installation project treated us with the utmost in professionalism. Not only will I call upon them for future electrical needs, I have referred Long Electric to a friend who is also interested in a whole house generator."
Response time2 days
9 neighbors recently requested a quote
Recommended by91%of homeowners
...
Showing 1-10 of 597
Electrical questions, answered by experts

No, it doesn’t matter which of the two wires goes on each of the two switch terminals. Just be sure to put the ground wire in the correct terminal. The ground wire is either green, bare copper, or green with a yellow stripe. The other wires are hot wires and are typically black. They can be used interchangeably.

Outlets with only two slots have no ground connection. That’s more common on very old outlets, which means it’s more likely the outlet won’t be polarized. You’ll have to closely examine the slots to see if there’s a size difference indicating polarization. Keep in mind outlets this old are usually out of code and should be replaced if you’re doing any electrical work.

With AC wiring, which is the kind most likely you’ll find at home, the black wire is “hot,” and the white is “neutral.” The bare or green wire is considered the safety ground wire. If you encounter DC wiring, it’s relatively easy to tell positive or negative wires apart. red wires are used to indicate positive voltage and black wires indicate negative voltage.

A voltmeter measures the voltage of AC or DC electrical current. Unlike a multimeter, measuring voltage is a voltmeter’s only function. Voltage is the potential difference between two points within a circuit. Measuring voltage with a voltmeter can help identify wiring issues or determine whether a battery is dead.

While the National Electrical Code (NEC) does not set a strict limit, a common guideline is to have a maximum of eight outlets or receptacles on a 15-amp circuit. This rule of thumb, which equates to about one outlet per 1.5 amps, helps keep the total electrical load safely below 80% of the circuit breaker's capacity. It is important to consider the power demands of any devices or appliances that will be plugged in, as overloading a circuit can lead to tripped breakers or create a fire hazard. To ensure the safety and code compliance of your electrical system, consult with a licensed electrician.

The Derwood, MD homeowners’ guide to electrical services

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

What do you need done? We’ll find top pros.
  • 🌱 "Mow a small front yard"
  • 🛠 "Fix a leaking pipe under the sink"
  • 🏠 "Repair shingles on an asphalt roof"