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

Avatar for Valley Plumbing Home Center, Inc
Valley Plumbing Home Center, Inc
4.7(
263
)
Plumbing for a Remodel or Addition - Install

Serving Walnut Creek, CA and surrounding areas

Approved

Super Service Award Winner

In business since 1982

Emergency services offered

Warranties offered

"Mike did an excellent job. He was very attentive to my concerns regarding the fill valve issue I've been having with one of the Toto toilets they installed. I am very satisfied with the resolution. Mike just reenforced my decions to use Valley for all my plumbing needs."
Additional Photos
Recommended by94%of homeowners
Avatar for Oak Plumbing Inc
Oak Plumbing Inc
4.6(
101
)
Plumbing for a Remodel or Addition - Install

Serving Walnut Creek, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2016

Free estimates

Emergency services offered

"The services we received from Oak Plumbing was FANTASTIC from the customer service (the ladies that answered the phones), to the Technicians. The quote/price for the repairs was very reasonable, as will as quick service. One of the things that I really appreciate was that both the technician that can to give the quote, and the technician that can to do the repairs both respected COVID Protocol including fresh booties for their shoes. Oak Plumbing will be my go-to plumbers for all my plumbing needs."
Response time2 days
5 neighbors recently requested a quote
Recommended by85%of homeowners
Avatar for Plumbing 1 Builder's Inc
Plumbing 1 Builder's Inc
5.0(
17
)
Plumbing for a Remodel or Addition - Install

Serving Walnut Creek, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2011

Free estimates

Warranties offered

"These guys were great. Fixed the issue and went above and beyond with a few extra repairs. Professional and cleaned up everything. I will definitely reach out again for any work in the future."
Response time3 hrs
Response rate85%
62 neighbors recently requested a quote
Avatar for Albert Nahman Plumbing, Heating, and Cooling
Albert Nahman Plumbing, Heating, and Cooling
4.4(
722
)
Plumbing for a Remodel or Addition - Install

Serving Walnut Creek, CA and surrounding areas

Approved (Corporate)

In business since 1981

Free estimates

Warranties offered

"The cost to replace three natural gas wall heater was slightly less than Gree mini-splits heater cooler. The installers were courteous and professional. Delayed several days as the equipment haven’t arrived yet. Job cost as agreed, but took half day longer due to the complexity of installation. Results are excellent. The mini-split units works as specified. Will use Albert Nahman heating plumbing again in the future."
Living room Mini-Split
Aquasana home Filtration
Almost no disturbance at EBMUD meter
Navien with filtration to protect the heat exchanger
New house valve and Pressure Reducing Valve

+73

Response time8 hrs
Response rate100%
44 neighbors recently requested a quote
Avatar for H K & S Plumbing Co.
H K & S Plumbing Co.
4.3(
96
)
Plumbing for a Remodel or Addition - Install

Serving Walnut Creek, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2000

Free estimates

Emergency services offered

"I had 5 different plumbing contractors look at my needed repair. They all had basically the same solution and high costs. Harry looked at the problem (repairing and installing 80ft of copper plumbing from the main to my house) and came up with a completely new and better solution at a lower cost. Harry was diligent and responsive and truly cared about a quality outcome and a sound repair. I would highly recommend Harry for all your plumbing needs."
H K & S Plumbing Co.
Response time11 hrs
27 neighbors recently requested a quote
Recommended by73%of homeowners
Avatar for Prime Time Plumbing
Prime Time Plumbing
5.0(
6
)
Plumbing for a Remodel or Addition - Install

Serving Walnut Creek, CA and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

"I had a great experience with them. They did a tankless water heater for a fair price and helped install new water lines for my espresso machine in my cafe. Would recommend to anyone who needs the job done right!"
Response time40 mins
Response rate88%
Recommended by100%of homeowners
Christy Plumbing
4.8(
6
)
Plumbing for a Remodel or Addition - Install

Serving Walnut Creek, CA and surrounding areas

Approved

In business since 2006

Free estimates

Emergency services offered

Christy Plumbing is a locally owned company that prides itself on providing fast, quality plumbing work in a professional manner. Our quality of work is a testament to the level of service and results you'll get when you choose us for your plumbing needs. With over 50% of our business coming from customer referrals, we would love the opportunity to be of service to you.\n\nChristy Plumbing will serve you with value pricing, high quality workmanship and by providing you with honest guidance to make your project more affordable, without compromising the quality of the final product. We're here to serve you with the knowledge and the quality that you deserve. Christy Plumbing operates under the assumption that time is of the essence. Therefore we run our operations efficiently and are always on time! \n\nDon't settle for second best! Give us a call! We a very happy to be of service to you!

Bathroom (sink and toilet)
Bathroom (closet)
Bathroom (full view)
Kitchen (angle from stairs)
Kitchen (with view in mirror)

+1

Response time2 days
Recommended by80%of homeowners
Avatar for Abdel's Home services
Abdel's Home services
5.0(
9
)
Plumbing for a Remodel or Addition - Install

Serving Walnut Creek, CA and surrounding areas

Approved

Hi, I’m Abdel, owner of Abdel’s Home Services. I’ve been providing residential repair and installation services for several years, helping homeowners with everything from small fixes to detailed improvement projects.\nI serve the Bay Area and surrounding communities, and I’m willing to travel locally for the right project. My specialties include TV mounting, door adjustments and installations, cabinet installation, drywall repair, fixture replacements, hardware installation, and general home repairs.\nClients hire me because I focus on quality, precision, and clear communication. I show up on time, protect your home, and make sure the work is done properly — not rushed. My goal is to leave every homeowner satisfied and confident in the results.\nI look forward to helping with your next project.

Avatar for Dynamic Plumbing And Drain LLC
Dynamic Plumbing And Drain LLC
5.0(
3
)
Plumbing for a Remodel or Addition - Install

Serving Walnut Creek, CA and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

🚨 Introducing Dynamic Drain Cleaning LLC! 🚨 \n \nWe are your new local drain cleaning specialists, committed to keeping your pipes flowing smoothly! 💧 With years of plumbing experience, our team at Dynamic Drain Cleaning LLC focuses solely on clearing drains and providing expert solutions for any repairs if needed. \n \n💡 Why Choose Us? \n \n • Experienced Plumbers: Skilled professionals specializing in drain cleaning. \n • No Flow, No Pay: Our promise is simple—If you don’t flow, you don’t owe! \n • Comprehensive Services: We tackle everything from stubborn mainline stoppages to kitchen, laundry, and lavatory drain clogs. We even offer mini jetting for more advanced cleaning. \n • Repair Solutions: If your drain issues go beyond cleaning, we’ll provide expert recommendations for repair. \n \n📅 Availability: We’re currently open on Saturdays and Sundays, offering flexible weekend service to fit your schedule! \n \n📞 Contact Us Today for a Free Est \n

Response time9 hrs
4 neighbors recently requested a quote
Recommended by100%of homeowners
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FAQs for plumbing installation for a remodel or addition projects in Walnut Creek, CA

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 Walnut Creek, CA 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.