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Top-Rated Plumbing installers for a remodel or addition in Frederick - Updated Nov 2026

Avatar for Mahon Plumbing
Mahon Plumbing
4.6(
199
)
Plumbing for a Remodel or Addition - Install

Serving Frederick, MD and surrounding areas

Approved

In business since 1994

Emergency services offered

Warranties offered

"Recently used Mahon Plumbing for various plumbing needs around my house. As a new homeowner you can be skeptical on what’s behind your walls or in this case pipes. Mahon did an initial sewer line inspection and called them back to swap out toilets and install natural gas in my backyard for a grill and fire table. They were professional, honest, and extremely knowledgeable about all phases of my projects. I would recommend Mahon Plumbing for all of your plumbing needs!"
Tankless water heater installation
Tankless Water Heater Installation
Commercial drain cleaning
Sewer Line Video Inspection
Water heater replacement

+30

Response time7 hrs
Response rate100%
Recommended by92%of homeowners
Avatar for Douglas & Son Services
Douglas & Son Services
4.6(
24
)
Plumbing for a Remodel or Addition - Install

Serving Frederick, MD and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

"This company is very professional and extremely personable. Patrick went above and beyond to ***** my issues and I was extremely satisfied I will definitely be using this company again for all my heating/cooling and plumbing services. Thanks again for doing a great job."
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+6

Response time11 hrs
Response rate100%
1 neighbors recently requested a quote
F.H. Furr Plumbing Heating & Air Conditioning Inc
4.0(
25
)
Plumbing for a Remodel or Addition - Install

Serving Frederick, MD and surrounding areas

Approved (Corporate)

In business since 1981

Free estimates

Emergency services offered

"Wonderful. Joe, Nelson, and the entire team did a great job. Polite, friendly, and efficient. Cost-effective too. We will definitely consider using them again for the inevitable kitchen and bathroom remodeling."
15 neighbors recently requested a quote
Recommended by54%of homeowners
MGD Contracting LLC
4.9(
39
)
Plumbing for a Remodel or Addition - Install

Serving Frederick, MD and surrounding areas

In business since 2007

Emergency services offered

"George was very prompt and provided great service. Came out quickly, gave accurate estimate, and completed work in the agreed upon time frame. I would use him and recommend his services as well. He was able to do a custom tile shower, tile floor, install toilet and double vanity to complete my bathroom in the basement. Very satisfied with the work that he did, he actually had to come in after the previous contractor I had decided he did not want to finish the job after starting it."
Recommended by100%of homeowners
Avatar for Excellent Plumbing
Excellent Plumbing
4.7(
179
)
Plumbing for a Remodel or Addition - Install

Serving Frederick, MD and surrounding areas

In business since 2000

Free estimates

Emergency services offered

"I was looking to replace my 13 year old water heater and called Excellent Plumbing to get a quote. I provided all the information to Mike and he gave me a quote over the phone. I really appreciated this because most of times contractors need to conduct a home visit. Mike was professional and answered all my questions before I agreed to the job. Afterwards, I sent pictures of the old heater and its location. Mike was right on time and got to work. It took about 4 hours. I am very pleased with my new water heater. I will be calling Excellent Plumbing for my any future plumbing jobs. I definitely recommend Excellent Plumbing for their professionalism, friendly customer service and superb work."
Recommended by92%of homeowners
CHEROKEE PLUMBING INC
5.0(
27
)
Plumbing for a Remodel or Addition - Install

Serving Frederick, MD and surrounding areas

In business since 1992

Free estimates

"Greg arrived within the time window originally communicated. Upon arrival he introduced himself. He was able to quickly identify the problem and then fix it. He had all required tools, ladder and pipe on his truck. He was very kind, friendly and professional. He showed us the faulty pipe, cleaned the area up and the cost was inline with our expectations. A very positive experience."
Recommended by100%of homeowners
Avatar for Professional lawns
Professional lawns
5.0(
20
)
Plumbing for a Remodel or Addition - Install

Serving Frederick, MD and surrounding areas

In business since 2009

Free estimates

Emergency services offered

"For seven years, Redline Plumbing has been my go-to for plumbing needs and their technicians have handled everything from minor repairs to major installations in my home. Their unwavering reliability, punctuality, and top-notch workmanship set them apart. Their skilled technicians, armed with cutting-edge tools, consistently exceed expectations. Their excellent communication keeps me informed, and their honesty ensures fair pricing without unnecessary repairs. They leave my home spotless, reflecting respect. Redline Plumbing isn't just a service; they're trusted partners in maintaining my home's integrity. If you seek dependability, expertise, and unwavering integrity in plumbing, choose Redline Plumbing. Believe me when I say that Redline has proven to be a humble lifesaver time and time again. Thank you for seven years of outstanding service!"
Fusion Car Wash
back of the hotel shows the qty of rooms
Main Street view of the hotel.
George Washington University Hospital
Fusion Car Wash

+26

Recommended by100%of homeowners
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FAQs for plumbing installation for a remodel or addition projects in Frederick, MD

Adding bathroom plumbing to a detached garage starts with the basic line installation cost of $900 to $1,300. On top of this base expense, you'll need to budget for each fixture. A toilet costs  $250 to $550, sinks cost $150 to $800, and a shower or bathtub costs $400 to $1,900. The project will also require ventilation, moisture-resistant materials, and possibly electrical work. Remember that these costs reflect only the plumbing aspects—additional construction, finishing, and permitting expenses will apply to complete a functional bathroom space.

While certain aspects of garage renovation might be suitable for DIY enthusiasts, plumbing installation requires professional expertise. Connecting to water and sewer systems demands specialized knowledge and equipment, and improper installation can result in severe water damage, code violations, and potential health hazards. Most municipalities require permits for plumbing modifications, and these often stipulate that licensed professionals must perform work. Consider limiting your involvement to simpler tasks like painting or basic finishing work.

The timeframe for adding plumbing to a detached garage spans one to three days for the actual plumbing work. However, this represents only the active installation period. The complete project timeline must account for planning, obtaining permits (which can take weeks depending on your locality), coordinating multiple contractors if needed, and addressing any unexpected challenges that arise during installation. Weather conditions can also impact excavation and outdoor connection work.

Adding plumbing to a detached garage will likely increase your property taxes. Tax assessors consider plumbing an improvement that enhances property value and functionality. The specific tax impact varies by location and project scope. Converting a garage into living space with plumbing facilities can trigger significant reassessment in many jurisdictions. Before proceeding with your project, consult your local tax assessor's office to understand the potential tax implications and factor this ongoing expense into your decision-making process.

The Frederick, MD homeowners’ guide to plumbing installations for a remodel or addition

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