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

Avatar for Schmitty's Plumbing
Schmitty's Plumbing
4.8(
50
)
Plumbing for a Remodel or Addition - Install

Serving Renton, WA and surrounding areas

Approved

In business since 2016

Free estimates

Emergency services offered

"Install was on time and as described. '1st Response' did the job I expected for the water heater install. Good customer service for scheduling. Note that the Angie's list price of $799 only covers the installation of 50 gallon gas AO Smith hot water tank. Assuming you also do installation of new brass fittings, new flex lines and new expansion tank (which you should probably all do with the new water heater) it will cost an ADDITIONAL approx $500-600 (mostly labor costs). That's a competitive price but still, you should be aware that the original quote is just for the water tank install itself, nothing else. All-in-all they did a good job for a competitive price. A few months after the install, so far, I can say I would recommend them for this type of work."
Response time2 days
Response rate100%
Recommended by93%of homeowners
Avatar for Knockout Plumbing & Mechanical, LLC
Knockout Plumbing & Mechanical, LLC
5.0(
14
)
Plumbing for a Remodel or Addition - Install

Serving Renton, WA and surrounding areas

Approved

In business since 2019

Emergency services offered

Warranties offered

"We had a great experience with Knockout. Small plumbing repair job that they were able to fix quickly. Gave us multiple options on how best to address the immediate problem, as well as prospective problems in the future. No complaints and would definitely hire again."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+53

Recommended by100%of homeowners
Avatar for Northwest Hydrojetting, LLC
Northwest Hydrojetting, LLC
5.0(
21
)
Plumbing for a Remodel or Addition - Install

Serving Renton, WA and surrounding areas

Approved

Super Service Award Winner

In business since 2018

Free estimates

Emergency services offered

"I have used this plumber for over 4 years now - they respond immediately to any concern, are the most honest and fair people out there! Anything from simple drain clear, or water heater install, to a side sewer and complete DADU plumbing installation…they do it all, and with great communication! I pass their name and number to anyone who is looking for an honest and reliable plumber!"
Camera inspection
Camera inspection
Repairs
Remodels
Remodels

+11

Response time4 hrs
57 neighbors recently requested a quote
Recommended by5%of homeowners
Avatar for Puget Sound Builders & Renovation
Puget Sound Builders & Renovation
5.0(
1,372
)
Plumbing for a Remodel or Addition - Install

Serving Renton, WA and surrounding areas

Approved

In business since 2006

Credit card accepted

Customers say: True professional

"Puget Sound BNR recently completed this stunning kitchen remodel, bringing new life to the heart of the home. The project included updated cabinetry, stylish countertops, modern lighting, and a more functional layout for better flow. The result is a bright, welcoming kitchen built for cooking, gathering, and making memories."
Bathroom Renovation
Basement Remodel
Bathroom Renovation
Basement Remodel
Kitchen Remodeling

+23

10 neighbors recently requested a quote
Avatar for SeaTown Electric Heating and Air
SeaTown Electric Heating and Air
4.7(
1,638
)
Plumbing for a Remodel or Addition - Install

Serving Renton, WA and surrounding areas

Approved

In business since 2014

Free estimates

Emergency services offered

"Make the repair as requested and went beyond by installing our range which was quite a tight fit. But he persevered and got it done. I will definitely calling him for my next plumbing job."
Seattle's Rewire Specialists
Generator
Tesla Chargers
Knob and Tube Removal
Ductless Install

+26

Response time1 day
10 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for Mega Mushroom LLC
Mega Mushroom LLC
5.0(
9
)
Plumbing for a Remodel or Addition - Install

Serving Renton, WA and surrounding areas

Approved

Super Service Award Winner

In business since 2007

Free estimates

Emergency services offered

"My company has been using Mega Mushroom for years. We specialize in property management for vacation rentals and use Mega for all our plumbing jobs. They are professional, timely, and have helped us with multiple emergency repairs."
Newmark Gas Addition
Newmark Gas Addition
Newmark Gas Addition
Newmark Gas Addition
Cistern Install

+8

Response time8 hrs
Response rate100%
29 neighbors recently requested a quote
Maintenance & Landscaping Pros
3.9(
30
)
Plumbing for a Remodel or Addition - Install

Serving Renton, WA and surrounding areas

Approved

In business since 1992

Free estimates

Small jobs welcome

"Both Daniel And Cirlayin came out to my house, they treated me and my messy house with respect! They got me right in within a week, and they got the JOB done! My house was CLEAN, CLEAN, CLEAN!!!! I LOVE IT,. They will be cleaning my house weekly, and I am so excited to come home to a clean HOME,I didn't have to clean. LOL. The ladies who did the job were quick and efficient. Thank you Service Magic for the recommendation."
Laundry Room Remodel
Laundry Room Remodel
Laundry Room Remodel
Laundry Room Remodel
Laundry Room Remodel

+31

Response time3 hrs
Response rate100%
Recommended by92%of homeowners
Avatar for Cahill's Plumbing & Heating
Cahill's Plumbing & Heating
4.1(
38
)
Plumbing for a Remodel or Addition - Install

Serving Renton, WA and surrounding areas

Approved

Credit card accepted

Customers say: Super punctual

"These guys were amazing! We had the plastic water intake valve behind the toilet burst and spray water everywhere at 4am. after cleaning up the mess we called Cahill's at about 6:45am and they arrived by 8:30am to fix the valve, which took them like 15 minutes. I asked them about doing all of the valves in the house (16 total) and they agreed to come back at noon to do all of them. At exactly noon they were back at my house and had all the valves changed out in less than 2 hours. They were friendly, clean, polite, and provided excellent customer service. Jason and Harry were the team that came to my house and I would highly recommend them. And thanks to Russell, the owner, for giving us a great deal on the work his team did. We will be calling on Cahill's for any future plumbing needs."
1 neighbors recently requested a quote
Recommended by82%of homeowners
2 Sons Plumbing
5.0(
5
)
Plumbing for a Remodel or Addition - Install

Serving Renton, WA and surrounding areas

Approved (Corporate)

In business since 2017

Credit card accepted

Offers commercial services

2 Sons Plumbing is a full-service plumbing and sewer company serving the greater Seattle area. Known for reliable service, honest recommendations, and quality workmanship, our team handles everything from everyday plumbing repairs to complex sewer solutions—helping homeowners keep their systems running smoothly year-round.

Avatar for Raburn Contracting Services, LLC
Raburn Contracting Services, LLC
4.0(
29
)
Plumbing for a Remodel or Addition - Install

Serving Renton, WA and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

"We hired Ryan with RCS to install a new sewer line for us. It was a huge undertaking that involved him drilling into *lots* of concrete and getting it connected to the city street. He was very communicative from the beginning and got the job done in a timely matter. I got 3 bids before going with him and can say that he is more than fair with his pricing. I would definitely recommend him to anyone for their sewer needs."
Response time2 days
27 neighbors recently requested a quote
Recommended by10%of homeowners
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FAQs for plumbing installation for a remodel or addition projects in Renton, WA

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 Renton, WA 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.