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

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

Serving Maple Valley, WA and surrounding areas

Approved

In business since 2016

Free estimates

Emergency services offered

"Schmitty's Plumbing responded to my Angi's service request almost as soon as I submitted it, and they beat out three other Angi plumbing companies in terms of pricing and transparency. I hired Schmitty's to remove an old double bowl kitchen sink and faucet with a new single bowl sink and upgraded faucet. There was no upselling or attempts to convince us to replace our garbage disposal which two of the other plumbers recommended we do. We saw no reason to replace our disposal which functions well and is not that old. Partners Drake and Gage came out to our home as scheduled, and they got to work immediately working efficiently and thoroughly. We appreciated their no-nonsense, honest, prompt service, and very fair pricing. I chose Schmitty's based on the positive customer reviews, and would hire them again. I told them I would recommend them to all my friends who have plumbing needs!"
Response time2 days
Response rate100%
Recommended by93%of homeowners
Avatar for SeaTown Electric Heating and Air
SeaTown Electric Heating and Air
4.7(
1,638
)
Plumbing for a Remodel or Addition - Install

Serving Maple Valley, 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
3 neighbors recently requested a quote
Recommended by93%of homeowners
Avatar for Cahill's Plumbing & Heating
Cahill's Plumbing & Heating
4.1(
38
)
Plumbing for a Remodel or Addition - Install

Serving Maple Valley, WA and surrounding areas

Approved

Credit card accepted

Customers say: Super punctual

"Work was done quickly and professionally. Were very careful to collect and/or cleanup any water drips. Had to cut wall board in laundry room to repair hose bib. Removed as small a piece as possible and replaced when finished."
1 neighbors recently requested a quote
Recommended by82%of homeowners
2 Sons Plumbing
5.0(
5
)
Plumbing for a Remodel or Addition - Install

Serving Maple Valley, 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 Maple Valley, 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
32 neighbors recently requested a quote
Recommended by10%of homeowners
Avatar for National Restoration Construction, LLC
National Restoration Construction, LLC
5.0(
2
)
Plumbing for a Remodel or Addition - Install

Serving Maple Valley, WA and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

We're dedicated to providing our clients with the very best in service, installation, and repair for all phases of your plumbing needs. We specialize in a variety of residential and commercial services and take pride in the attention to detail put into each of the projects we're involved with. We're known for our quality work and the integrity of our business. We look forward to building long-term relationships with our clients, and guarantee your satisfaction.

Recommended by100%of homeowners
Avatar for Iron Earth Construction LLC
Iron Earth Construction LLC
5.0(
4
)
Plumbing for a Remodel or Addition - Install

Serving Maple Valley, WA and surrounding areas

Approved

In business since 2021

Free estimates

Credit card accepted

"They quickly assessed the situation, gave a reasonable quote, and were very proficient and professional. My condo unit was under contract and a water leak caused by another unit needed to be repaired asap and they did it. Also kept me well informed."
Before
During rooftop build
Rooftop Deck during
AFter
Installation of Euro Fencing

+43

Response time3 days
24 neighbors recently requested a quote
Recommended by75%of homeowners
Avatar for DRAIN MARSHAL PLUMBING CO
DRAIN MARSHAL PLUMBING CO
New to Angi
Plumbing for a Remodel or Addition - Install

Serving Maple Valley, WA and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

Drain Marshal Plumbing Company is a licensed, bonded and insured plumbing contractor (WA Lic. DRAINMP743PK) serving Pierce, King, Snohomish, Thurston and Kitsap counties, open 24 hours a day, 7 days a week. We handle every aspect of residential plumbing: drain cleaning and hydro-jetting, sewer line inspection and repair, water heater repair and replacement (tank and tankless), gas line installation, garbage disposals, faucets, toilets, leak detection, repiping, water pressure problems and emergency plumbing. Every job starts with a free in-home camera inspection so you can see exactly what we see, followed by upfront flat-rate pricing before any work begins. We install quality products from Rheem, Navien, TOTO and InSinkErator supplied through Pacific Plumbing Supply, and we leave your home cleaner than we found it. Call or text anytime.

Basement tankless
Closet tankless unit
Freestanding tub set
Rough-in, demo stage
Dual-sink vanity

+6

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FAQs for plumbing installation for a remodel or addition projects in Maple Valley, 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 Maple Valley, 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.