How much does it cost to add a bathroom to a detached garage?

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.

Can I add plumbing to my detached garage myself?

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.

How long does it take to add plumbing to a detached garage?

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.

Will adding plumbing to my detached garage increase my property taxes?

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.

Top-Rated Plumbing Installations for a Remodel or Addition Experts in Half Moon Bay, CA

Pedro Galvan Plumbing, Inc.

Pedro Galvan Plumbing, Inc.

Customers say: Quality work

Recommended by 94% of Angi customers

21 years of experience

Pedro Galvan Ramirez Plumbing, Inc., is the premier plumbing contractor in the Richmond Area. We finish every job to the customer's standards. Call today for a free quote!

"We are incredibly grateful to Pedro Galvan and his team for stepping in during a moment of urgent need. When our hot water system suddenly failed, leaving us without hot water for daily essentials, Pedro responded with a level of professionalism, clarity, and compassion that is truly rare. From the very first call, Pedro was attentive, transparent about pricing, and committed to solving the problem quickly. He provided us with the most cost-effective and honest quote out of several we obtained—and, even more importantly, was able to come almost immediately when others could not. His workmanship was precise, efficient, and tidy. It was clear we were in the hands of someone who genuinely takes pride in his craft. In a world where so many service professionals overpromise and underdeliver, Pedro Galvan delivers exactly what he promises—and does so with warmth, integrity, and a deep respect for his clients. We recommend him without hesitation to anyone needing plumbing services."

nicola s on July 2025

Pedro Galvan Ramirez Plumbing, Inc., is the premier plumbing contractor in the Richmond Area. We finish every job to the customer's standards. Call today for a free quote!

"We are incredibly grateful to Pedro Galvan and his team for stepping in during a moment of urgent need. When our hot water system suddenly failed, leaving us without hot water for daily essentials, Pedro responded with a level of professionalism, clarity, and compassion that is truly rare. From the very first call, Pedro was attentive, transparent about pricing, and committed to solving the problem quickly. He provided us with the most cost-effective and honest quote out of several we obtained—and, even more importantly, was able to come almost immediately when others could not. His workmanship was precise, efficient, and tidy. It was clear we were in the hands of someone who genuinely takes pride in his craft. In a world where so many service professionals overpromise and underdeliver, Pedro Galvan delivers exactly what he promises—and does so with warmth, integrity, and a deep respect for his clients. We recommend him without hesitation to anyone needing plumbing services."

nicola s on July 2025

RSB Construction Group Inc.

58 W Portal Ave, Unit 150

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•Approved Pro

RSB Construction Group Inc.

58 W Portal Ave, Unit 150

New on HomeAdvisorNew on HomeAdvisor

•Approved Pro

4 years of experience

Free onsite estimate

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!

BAYPRO PLUMBING

611 BRIGHTON RD PACIFICA

BAYPRO PLUMBING

611 BRIGHTON RD PACIFICA

BAYPRO PLUMBING We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"I am a handy man and have been involved in many home remodels personally and worked with Various plumbers over the years. Ed at Baypro Plumbing is simply outstanding. The best I have seen with competitive price. HIGHLY RECOMMENED."

Michael B on September 2025

BAYPRO PLUMBING We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business.

"I am a handy man and have been involved in many home remodels personally and worked with Various plumbers over the years. Ed at Baypro Plumbing is simply outstanding. The best I have seen with competitive price. HIGHLY RECOMMENED."

Michael B on September 2025

Bay Remodeling Kitchen & Bath

2033 Gateway Pl #585

5.00(

38

)

•Approved Pro

Bay Remodeling Kitchen & Bath

2033 Gateway Pl #585

5.00(

38

)

•Approved Pro

Customers say: Super punctual

Recommended by 97% of Angi customers

Recommended by 97% of HomeAdvisor customers

864 local quotes requested

Bay Remodeling Kitchen & Bath is a complete home remodeling service including design, kitchen remodeling, bathroom remodeling, flooring, roofing, new build & home additions—owned and operated, general contractor and construction management company. We are a full-service construction contractor with an in-house team providing expertise across all trades, specializing in KITCHEN & BATH REMODELING. We can complete projects ranging in size from residential remodels to retail build-outs to large commercial jobs. We pride ourselves on our collaborative approach and the high client satisfaction we achieve through quality work. CALL US TODAY FOR A FREE CONSULTATION

"From the first consultation to the last walkthrough, the Bay Remodeling Kitchen & Bath team provided exceptional service. They remodeled our kitchen and laid new flooring throughout our house. Every step of the process was expertly and meticulously handled. They answered all of our questions, kept us informed, and ensured we were happy with the result. The quality of their work speaks for itself, therefore we're happy we chose them for our makeover."

Stacy D on December 2024

Bay Remodeling Kitchen & Bath is a complete home remodeling service including design, kitchen remodeling, bathroom remodeling, flooring, roofing, new build & home additions—owned and operated, general contractor and construction management company. We are a full-service construction contractor with an in-house team providing expertise across all trades, specializing in KITCHEN & BATH REMODELING. We can complete projects ranging in size from residential remodels to retail build-outs to large commercial jobs. We pride ourselves on our collaborative approach and the high client satisfaction we achieve through quality work. CALL US TODAY FOR A FREE CONSULTATION

"From the first consultation to the last walkthrough, the Bay Remodeling Kitchen & Bath team provided exceptional service. They remodeled our kitchen and laid new flooring throughout our house. Every step of the process was expertly and meticulously handled. They answered all of our questions, kept us informed, and ensured we were happy with the result. The quality of their work speaks for itself, therefore we're happy we chose them for our makeover."

Stacy D on December 2024

Maverick Water Heaters & Plumbing

625 Vue De Mer Avenue

5.00(

15

)

•Approved Pro

Maverick Water Heaters & Plumbing

625 Vue De Mer Avenue

5.00(

15

)

•Approved Pro

Customers say: Quick response

Recommended by 100% of Angi customers

Recommended by 100% of HomeAdvisor customers

110 local quotes requested

We specialize in plumbing services, water heaters, repairs, inspections, installations, and more! We guarantee your satisfaction, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out all the services we offer below and call -or- click to schedule a free estimate today! 650-400-2459

"Great! Steve arrived super quick, identified the problem and fixed it. Nice work and a nice guy. I would recommend him to anyone."

James M on February 2024

We specialize in plumbing services, water heaters, repairs, inspections, installations, and more! We guarantee your satisfaction, and we won’t leave until the job is done right. We pride ourselves on the quality work we provide, while delivering great customer service! Check out all the services we offer below and call -or- click to schedule a free estimate today! 650-400-2459

"Great! Steve arrived super quick, identified the problem and fixed it. Nice work and a nice guy. I would recommend him to anyone."

James M on February 2024

Tech Line Construction Inc.

6114 La Salle Avenue

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•Approved Pro

Tech Line Construction Inc.

6114 La Salle Avenue

New on HomeAdvisorNew on HomeAdvisor

•Approved Pro

2129 local quotes requested

5 years of experience

Welcome to Tech Line Construction, your trusted partner in enhancing your home and transforming your wishes into visual and solid realities. With over a decade of unwavering dedication and a commitment to excellence, we have proudly served our clients in delivering top-tier construction solutions. We specialize in providing top-notch services for residential and commercial projects. Our commitment to professionalism, quality, and meticulous attention to detail sets us apart from our competitors. Choose Tech Line Construction for your next construction project and experience the highest level of service and craftsmanship. Bay Area General B Contractor Jose Rodriguez ( General Building contractor ) (510)798-5869 Office@techlineconstruction.info Tech Line Construction inc TechLineconstructiondesign.com CSLB # LIC 1094361 Commercial liability &Worker comp. Insured & bonded

BEAR Remodeling Inc.

2678 N Main St

4.90(

10

)

•Approved Pro

BEAR Remodeling Inc.

2678 N Main St

4.90(

10

)

•Approved Pro

Customers say: Quick response

Recommended by 100% of Angi customers

Recommended by 100% of HomeAdvisor customers

1547 local quotes requested

Don't wait to create your dream home! ✨ Our new financing options make your remodel projects affordable NOW. 💰 Limited-time rates available—click the link to get started! ➡️https://www.enhancify.com/bear-remodeling-inc **Due to our current installation schedule we have a project minimum* depending on the job size- ask for details as it varies depending on project size- starting at $10 K Please call today to schedule a complimentary consultation 925-567-3021 BEAR Remodeling, Inc. is a family-owned business and a full-service General Contractor that specializes in residential home remodeling projects. Our services include bathroom remodeling, kitchen remodeling, room additions, garage conversions, and ADU'S With full licensing, bonding, and insurance, it ensures a reliable and trustworthy experience for its clients. Our team of experienced professionals, which includes both engineers and designers, collaborate in order to deliver exceptional results, consistently exceeding client expectations and transforming homes into stunning spaces. (we do not work with modular/trailer homes or offer handyman services.)

"Working with BEAR Remodeling on our ADU garage conversion has been a great experience! The 3D design has really helped us see the project before work began. The team has stayed organized, finished on time, and delivered exactly what we had imagined. Everything has turned out clean, modern, and built to last. We have happily recommended BEAR Remodeling to anyone looking for reliable remodeling services!"

Ryker H on May 2025

Don't wait to create your dream home! ✨ Our new financing options make your remodel projects affordable NOW. 💰 Limited-time rates available—click the link to get started! ➡️https://www.enhancify.com/bear-remodeling-inc **Due to our current installation schedule we have a project minimum* depending on the job size- ask for details as it varies depending on project size- starting at $10 K Please call today to schedule a complimentary consultation 925-567-3021 BEAR Remodeling, Inc. is a family-owned business and a full-service General Contractor that specializes in residential home remodeling projects. Our services include bathroom remodeling, kitchen remodeling, room additions, garage conversions, and ADU'S With full licensing, bonding, and insurance, it ensures a reliable and trustworthy experience for its clients. Our team of experienced professionals, which includes both engineers and designers, collaborate in order to deliver exceptional results, consistently exceeding client expectations and transforming homes into stunning spaces. (we do not work with modular/trailer homes or offer handyman services.)

"Working with BEAR Remodeling on our ADU garage conversion has been a great experience! The 3D design has really helped us see the project before work began. The team has stayed organized, finished on time, and delivered exactly what we had imagined. Everything has turned out clean, modern, and built to last. We have happily recommended BEAR Remodeling to anyone looking for reliable remodeling services!"

Ryker H on May 2025

Be Home Remodeling Inc

84 West Santa Clara Street

5.00(

3

)

•Approved Pro

Be Home Remodeling Inc

84 West Santa Clara Street

5.00(

3

)

•Approved Pro

Recommended by 100% of Angi customers

Recommended by 100% of HomeAdvisor customers

1434 local quotes requested

***346 PROJECTS/24 IN PROGRESS/322 COMPLETED**YOUR DREAM REMODEL AWAITS. LET'S MAKE IT HOME!** Welcome to Be Home Remodeling! We specialize in transforming homes with expert craftsmanship, innovative designs, and personalized solutions. into dream We turn houses into dream homes. With a commitment to quality craftsmanship and personalized service, we bring your vision to life, creating spaces that reflect your style and meet your needs. From kitchens to full-home remodels, we bring your vision to life, creating beautiful, functional spaces you’ll love. eHome Remodeling was founded by Benjamin, who leads our team with over 10 years of experience transforming homes across the Bay Area. We specialize in everything from detailed kitchen remodels to full-scale renovations, ensuring each space perfectly reflects your unique vision and lifestyle. At BeHome, we prioritize transparent communication, meticulous planning, and quality craftsmanship, working closely with you at every stage to create a space you’ll love coming home to. Contact us today for your FREE estimate by calling 408-616-4989 or click the request a quote link!

"Appreciate the great communication, Benjamin and his team was professional, clean after themselves and was delivering what was promised. Will definitely hire them again Thank you!"

Liran Salesman b on December 2024

***346 PROJECTS/24 IN PROGRESS/322 COMPLETED**YOUR DREAM REMODEL AWAITS. LET'S MAKE IT HOME!** Welcome to Be Home Remodeling! We specialize in transforming homes with expert craftsmanship, innovative designs, and personalized solutions. into dream We turn houses into dream homes. With a commitment to quality craftsmanship and personalized service, we bring your vision to life, creating spaces that reflect your style and meet your needs. From kitchens to full-home remodels, we bring your vision to life, creating beautiful, functional spaces you’ll love. eHome Remodeling was founded by Benjamin, who leads our team with over 10 years of experience transforming homes across the Bay Area. We specialize in everything from detailed kitchen remodels to full-scale renovations, ensuring each space perfectly reflects your unique vision and lifestyle. At BeHome, we prioritize transparent communication, meticulous planning, and quality craftsmanship, working closely with you at every stage to create a space you’ll love coming home to. Contact us today for your FREE estimate by calling 408-616-4989 or click the request a quote link!

"Appreciate the great communication, Benjamin and his team was professional, clean after themselves and was delivering what was promised. Will definitely hire them again Thank you!"

Liran Salesman b on December 2024

RockBay Construction and Remodeling

303 Twin Dolphin Dr. 6th Floor

5.00(

2

)

•Approved Pro

RockBay Construction and Remodeling

303 Twin Dolphin Dr. 6th Floor

5.00(

2

)

•Approved Pro

Customers say: Quick response

Recommended by 100% of Angi customers

Recommended by 100% of HomeAdvisor customers

11 years of experience

Rock Bay Construction & Remodeling . Based in the heart of the Bay Area, CA, and backed by over 10 years of design-build experience. Our family-owned company prides itself on delivering high-quality construction, remodeling, and design services tailored to meet the unique needs of each client. Whether modernizing kitchens and bathrooms, adding new rooms, or executing complete home renovations, our expert team ensures precision, reliability, and unparalleled craftsmanship. Partner with us to elevate your space with the perfect blend of functionality and style. Contact us today to get started! Licensed, bonded and insured. Lic # 119693

"It was such a smooth process. Our bathroom looks amazing. The team was very accommodating to last minute changes by us, very transparent in communicating to us on the milestones. We were also at work during the day and felt very safe with the workers around our dog. The project manager brought the right skilled plumbers, electricians and tile people to work on the project and it felt like a white glove treatment. On the cost side, very affordable for the quality of work they perform and we found the transparency in pricing very critical to us picking them."

Nilotpal P on February 2025

Rock Bay Construction & Remodeling . Based in the heart of the Bay Area, CA, and backed by over 10 years of design-build experience. Our family-owned company prides itself on delivering high-quality construction, remodeling, and design services tailored to meet the unique needs of each client. Whether modernizing kitchens and bathrooms, adding new rooms, or executing complete home renovations, our expert team ensures precision, reliability, and unparalleled craftsmanship. Partner with us to elevate your space with the perfect blend of functionality and style. Contact us today to get started! Licensed, bonded and insured. Lic # 119693

"It was such a smooth process. Our bathroom looks amazing. The team was very accommodating to last minute changes by us, very transparent in communicating to us on the milestones. We were also at work during the day and felt very safe with the workers around our dog. The project manager brought the right skilled plumbers, electricians and tile people to work on the project and it felt like a white glove treatment. On the cost side, very affordable for the quality of work they perform and we found the transparency in pricing very critical to us picking them."

Nilotpal P on February 2025

Unique Home Design & Remodeling

303 Twin Dolphin Dr.

New on HomeAdvisorNew on HomeAdvisor

•Approved Pro

Unique Home Design & Remodeling

303 Twin Dolphin Dr.

New on HomeAdvisorNew on HomeAdvisor

•Approved Pro

1884 local quotes requested

42 years of experience

Unique Home Design & Remodeling is a leader in providing value-added construction services to our customers by creating a successful partnership throughout the construction process. Our pledge is to establish lasting relationships with our customers by exceeding their expectations and gaining their trust through exceptional performance by every member on our construction team. Unique Home Design & Remodeling's mission is to accomplish full customer satisfaction in every area possible from color selection to project completion. Unique Home Design & Remodeling's main focus is to provide our future clients with a professional home improvement experience. We vow to our customers with the highest level of quality construction services at fair market and competitive prices. To ensure the longevity of our company through repeat and referral business achieved by customer satisfaction in all areas including timeliness, attention to detail and service-minded attitudes.

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Pedro Galvan Plumbing, Inc.

Pedro Galvan Plumbing, Inc.

RSB Construction Group Inc.

RSB Construction Group Inc.

BAYPRO PLUMBING

BAYPRO PLUMBING

Bay Remodeling Kitchen & Bath

Bay Remodeling Kitchen & Bath

Maverick Water Heaters & Plumbing

Maverick Water Heaters & Plumbing

Tech Line Construction Inc.

Tech Line Construction Inc.

BEAR Remodeling Inc.

BEAR Remodeling Inc.

Be Home Remodeling Inc

Be Home Remodeling Inc

RockBay Construction and Remodeling

RockBay Construction and Remodeling

Unique Home Design & Remodeling

Unique Home Design & Remodeling

The Half Moon Bay, CA homeowners’ guide to plumbing installations for a remodel or addition

How Much Does Tankless Water Heater Repair Cost in 2025?

How Much Does Plumbing Stack Replacement Cost in 2025?

Repair or Replace a Bathtub Faucet

Install a Drinking Water Fountain

Buy a Toilet

Repair a Drain Line Breakage

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Get matched with top plumbing installers for a remodel or addition in Half Moon Bay, CA

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Find Plumbing installers for a remodel or addition in Half Moon Bay

Pedro Galvan Plumbing, Inc.

Pedro Galvan Plumbing, Inc.

RSB Construction Group Inc.

RSB Construction Group Inc.

BAYPRO PLUMBING

BAYPRO PLUMBING

Bay Remodeling Kitchen & Bath

Bay Remodeling Kitchen & Bath

Maverick Water Heaters & Plumbing

Maverick Water Heaters & Plumbing

Tech Line Construction Inc.

Tech Line Construction Inc.

BEAR Remodeling Inc.

BEAR Remodeling Inc.

Be Home Remodeling Inc

Be Home Remodeling Inc

RockBay Construction and Remodeling

RockBay Construction and Remodeling

Unique Home Design & Remodeling

Unique Home Design & Remodeling

The Half Moon Bay, CA homeowners’ guide to plumbing installations for a remodel or addition

How Much Does Tankless Water Heater Repair Cost in 2025?

How Much Does Plumbing Stack Replacement Cost in 2025?

Repair or Replace a Bathtub Faucet

Install a Drinking Water Fountain

Buy a Toilet

Repair a Drain Line Breakage

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