Guaranteed Plumbing

★★★★★ 4.7 / 5 (118)
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: 1031 Blackwood Ln, Lafayette, CA 94549
: (925) 820-2090
: http://www.guaranteedplumbingco.com

Company Overview

Guaranteed Plumbing and its affiliate, East Bay Gas Lines, delivers exceptional quality and customer satisfaction to our clients. As a complete plumbing and gas line service, we are licensed, bonded, and insured, well-versed in municipal regulations. Additionally, we are a trusted vendor for the Town of Danville Building Department.

We proudly serve Danville and Alamo, along with Contra Costa and Alameda Counties, and the broader East Bay Area. We work alongside individual homeowners, general contractors, restaurants, businesses, retailers, property managers, real estate professionals, and government services. No matter the complexity, whether standard or custom, we can handle any plumbing or gas line project.

Marcus Madrid founded Guaranteed Plumbing, Inc. in Danville, California in 2003, with an emphasis on residential service and renovation work. Through referrals that attest to our staff's outstanding skills and efficiency, we swiftly expanded to manage various residential and commercial projects in the greater East Bay.

Marcus Madrid takes pride in leading a skilled, dependable, and friendly team, while also being actively involved in every project. He remains engaged from the initial concept to the final completion. We appreciate the significance of fostering long-term customer connections, working with clients to provide economical and inventive plumbing options. Our team pays meticulous attention to detail in every project, whether designing a large commercial installation or replacing a kitchen faucet.

As a second-generation plumber, Marcus began his journey in the trade at 12, working with his father. A Bay Area resident for over 30 years, he earned his Bachelor's Degree from Cal Poly San Luis Obispo.

Business Services

  • Bathtub installation
  • Bathtub repair
  • Drain installation
  • Drain repair
  • Faucet installation
  • Faucet repair
  • Garbage disposal repair
  • Gas line installation
  • Gas line repair
  • Hot water recirculation pump installation
  • Hot water recirculation pump repair
  • Plumbing inspection
  • Plumbing installation or replacement
  • Plumbing repair
  • Sewer installation
  • Sewer repair
  • Shower installation
  • Shower repair
  • Sink installation
  • Sink repair
  • Toilet installation
  • Toilet repair
  • Water heater installation
  • Water heater repair
  • Water pipe installation
  • Water pipe repair

Business Location & Hours



Mon:7:00 AM - 5:00 PM
Tue:7:00 AM - 5:00 PM
Wed:7:00 AM - 5:00 PM
Thu:7:00 AM - 5:00 PM
Fri:7:00 AM - 5:00 PM
Sat:Closed
Sun:Closed

Recommended Customer Reviews

katie m.
★★★★★

Ryan is great at his job. A gem of a find. I would highly recommend guaranteed. The staff is friendly and they were super accommodating

Jim S.
★★☆☆☆

The results of the work Guaranteed Plumbing performed have not met our expectations. I've been disappointed with the replacement equipment they used. Guaranteed Plumbing disagrees with my assessment. Must be one of the reasons we've never heard back from the main office. I'm considering having it redone on my dime. I personally wound't recommend Guaranteed Plumbing to friends and family.

Ortal O.
★★★★★

Super fast response and a very professional and kind service from Brian the plumber.
Fair price too
A 5 star experience
Thanks !

Anatoli S.
★★★★★

I've got so many calls from the company + an apology from the Luis that i almost developed a 'Stockholm Syndrome'.
Ryan called and offered a free inspection on my repair ( it was done and no issues found), Marcus called to make sure that all is taking care of and then Luis called to personally apologize ( thats when my Stockholm Syndrome kicked in). I did not mean to cause any personal troubles to anyone especially during the holidays. GP did not charge me for the initial service although i told Ryan that this was not about $$ and i am totally fine if they do charge, but he insisted. Bottom line - based on the way that company handled my complaint i feel like it was just one minor misstep on their part and not a common practice.

Tom M.
★★★★★

I was really impressed with General Plumbing when they came out to diagnose a problem with our well pump. Made the appointment via Yelp, arrived on time, and the service team was polite, knowledgeable, and extremely helpful. I spent some time describing the problem and looking at the equipment with Chris (the technician). He made a thorough diagnosis within an hour and gave me good advice on how to address the problem (speciality electrical and well pump service). I've worked with a lot of plumbers on many different projects and this might have been my best experience ever. Well done GP. Would definitely use them again!

Professor P.
★★★★★

Quick response, quote and scheduling. They showed up on time, and the plumber was friendly and did a great job. He cleaned up after he was done and left everything in perfect order. Thank you!

Jeff S.
★★★★★

Patrick came out and quickly Diagnosed my problem with my plumbing in my house. We had hot water both in the cold and hot water faucets and Patrick was able to quickly identify the issue and correct. I'm very impressed with Patrick's knowledge and customer service and would highly recommend he and his company to others.

Terry S.
★★★★★

Friendly, professional and on-time. I requested a on-line quote for outdoor plumbing ( with picture), and received a prompt reply with a good price. Recommended by two of our neighbors and now I see why. Excellent.

Shayna R.
★★★★★

We hired guaranteed plumbing for a bathroom remodel in our Danville studio. Marcus and his team got me the quotes and finished the job at lighting speed!

They kept us in the loop as they discovered why the plumbing in our building is less than ideal and clearly laid out my options. Each person that came in to work on the project: flooring, tiling, grout, plumbing were are professional and a joy to have in the studio while they were working. The bathroom looks absolutely gorgeous we couldn't be happier. We will definitely hire Guaranteed Plumbing again for any future projects!

Barbara J.
★★★★★

I was selling my dads condo and needed plumbing work done ASAP to close escrow. Ryan gave me a two quotes for work depending on how much I wanted done, from a picture I texted him. He sent a technician the next day and it was completed and I didn't even need to be there. He Emailed the bill after completed. They will always be my Plumbers!
Thank you guys!,

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