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

Avatar for MH Contracting, LLC
MH Contracting, LLC
4.8(
70
)
Plumbing for a Remodel or Addition - Install

Serving Saint Peters, MO and surrounding areas

Approved

In business since 2012

Free estimates

Warranties offered

"Mike and his team are absolutely wonderful to work with. We moved into our new home in October of 2020 and our basement was completely unfinished at the time. We worked with Mike to create plans to add a bedroom, office, laundry room, family room, and an additional bathroom. During the project, we were so happy with Mike and his team that we asked if he would be able to help us with the upstairs as well. For the upstairs, MH contracting removed a wall that separated the kitchen and living room, removed carpet in the bedrooms, updated two bathrooms with new tile and vanities, along with installing new vinyl plank flooring throughout the upstairs. The wall was removed flawlessly and you would never know that there was a wall there. For the basement, they stabilized the stairs, installed completely new framing, fixed plumbing components that were not up to code from the previous owner, fully insulated and dry walled, painted, all new electrical and panel upgrades, added an egress window, and laid new vinyl plank flooring. The basement is now completely finished with proper permits and fully passed inspections. Mikeâ s communication was great throughout the entire project and all of his team members were very polite, clean, and helpful. He kept us up to date on any material delays throughout the pandemic and set proper expectations. There were material delays that were out of Mikeâ s control so the projects took about four and a half months to complete but they were a pleasure to work with the entire time. We would absolutely recommend Mike and his team to any of our friends and family for any work youâ re looking to have done to your home or business."
siding job
siding job
siding job
Siding job
Bathroom remodel

+196

Response time1 day
4 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for Dunn Heating Air Conditioning and Plumbing
Dunn Heating Air Conditioning and Plumbing
4.7(
274
)
Plumbing for a Remodel or Addition - Install

Serving Saint Peters, MO and surrounding areas

Approved

In business since 2003

Free estimates

Emergency services offered

"I needed to replace my parents' 40 year old AC Condenser and coil, and replace it with something that worked with the new furnace my father got installed four years prior. They were able to do the work requested, and also offered to redo the furance installation as the previous company installed it right on the basement floor where any backup/water could possibly get into the system. They were very prompt and showed up on time/on schedule. They were very upfront about costs and pricing and there were no last-minute price changes or hidden fees, which I appreciate. Work was done well and they ensured that everything worked before leaving the job site. The gentlemen working were very professional and understanding. I highly recommend them for anyone looking to replace their HVAC or to correct work that was previously poorly done."
Additional Photos
Response time2 days
Recommended by89%of homeowners
Avatar for Mr. Rooter Plumbing of St. Charles
Mr. Rooter Plumbing of St. Charles
4.2(
340
)
Plumbing for a Remodel or Addition - Install

Serving Saint Peters, MO and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

"The plumber was excellent. Good experience! They were the second company that I contacted. I did schedule the first just to get an estimate. Mr. Rooter came right out. They gave me what I thought was a reasonable estimate with two options. I decided on the lower cost, hopeful option and said I would wait for another quote if it was determined that I needed the much higher cost second option. Fortunately the low cost option did the trick. I was so happy and satisfied with the relatively quick work, I asked the plumber to give me a quote on something else I needed. I had that work done too. Both repairs were done to my satisfaction. I will be using them again for anymore of my plumbing needs."
Mr. Rooter of St. Louis
Mr. Rooter of St. Louis
Mr. Rooter of St. Louis
Mr. Rooter of St. Louis
Mr. Rooter of St. Louis

+7

Response time6 hrs
42 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for MetaMorph LLC
MetaMorph LLC
5.0(
6
)
Plumbing for a Remodel or Addition - Install

Serving Saint Peters, MO and surrounding areas

Approved

In business since 2015

Free estimates

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.

After
Before
1 neighbors recently requested a quote
Avatar for Bieg Plumbing & Mechanical
Bieg Plumbing & Mechanical
4.6(
120
)
Plumbing for a Remodel or Addition - Install

Serving Saint Peters, MO and surrounding areas

In business since 1960

Free estimates

Emergency services offered

"I would highly recommend Dave to anyone! He did an amazing job, first analyzing the problem then taking corrective action to make the necessary repairs. Dave showed us what was wrong and even the old gasket and PVC drain. Dave was very professional and friendly. Dave is a real asset to Bieg Plumbing!!"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Commercial Rooftop Unit Replacement

+5

Recommended by90%of homeowners
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FAQs for plumbing installation for a remodel or addition projects in Saint Peters, MO

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 Saint Peters, MO 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.