Guaranteed Plumbing did a great job installing our kitchen faucet for us. The serviceman was professional and knowledgeable. We have been using them for years. I would highly recommend to others. read more

We had Guaranteed Plumbing take care of some plumbing fixture repairs and they did a great job. The two plumbers were very skilled, courteous, knowledgeable and cleaned up after themselves. They will be our plumbers going forward. read more

Initially we were impressed, paid $325.00 for 40" service call, to clear a stoppage between kitchen and garage utility tub. Technician was told the clog started in the hall bathroom, then clog moved to the kitchen. Flow was restored in the kitchen, but one day later, crud backed up in the bathtub again when toilet was flushed. We had Guaranteed Plumbing come back out next business day. Tech spent 2 hrs clearing main sewer. We were charged an additional $500, only $40 credit for previous service. Call to office,"why only $40 credit for second visit", when clog was not cleared completely on first visit? Office would not back down. They seem to regard our clog as two separate issues. We don't agree, and we think was got soaked. read more

What I relief to have Lane come out yesterday. Finally someone who could analyze and repair a continuous issue with our pressure pump. Workmanship was great and he explained everything as we went along. So grateful to finally have an answer. read more

We have used Guaranteed Plumbing for all of our work at our house over the past ten years. They are always extremely professional, knowledgeable, prompt and fairly-priced. Today's visit was as good as ever - thank you! I highly recommend. read more

I've been using Guaranteed Plumbing for about 4 years now. I appreciate their promptness, and quality of workmanship. Eric was my service person yesterday and he found the problem under my kitchen sink and fixed it. I'm delighted. Thank you Guaranteed. read more

Eric from Guaranteed Plumbing was on time he. He repaired two of TOTO fill valves in our TOTO toilets quickly and efficiently. He also provided some insights into repairing our kitchen faucet in the future, if our kitchen faucet starts to leak when shut off, read more

I had the best experience with Guaranteed Plumbing. They answered my (numerous) calls right away and sent out a plumber within a week. The work was swift and professional. The plumber was friendly and even added a little extra project I had not discussed in the original quote. He treated my home with respect and answered all my questions patiently. I will definitely book the again and have advised my friends and family to do the same. read more

Super fast and easy. Had a garden faucet that needed replacing and Derik took care of it. Thanks!

Very knowledgable staff. Easy to work with, knew their stuff. Derek was very professional, diagnosed our issues, and went above and beyond. Would definitely recommend them for any future work. read more

Moved into my newly remodeled home when the Master Bathroom sinks filled with particle filled water when I used the kitchen sink and garbage disposal. After it was determined that the issue had nothing to do with the remodel, I made an appointment with Guaranteed Plumbing. I received a text message from Drew letting me know he was on his way. He quickly and properly diagnosed the problem and able to resolve the issue quickly. He then tested everything to make sure the issue was fully resolved. Drew is a good communicator and was respectful of my newly remodeled home. I will continue to use Guanranteed Plumbing for any future issies. read more

These guys are consistently great. Today Eric installed a new disposal unit in my home. He was on time, very thorough, friendly, left my kitchen as he found it and answered all my questions regarding future plumbing changes I want to make. I would never consider calling any other pluming company to work on my house. read more

Very quick to respond to a minor emergency. Excellent service and repair. Victor was very professional and extraordinarily polite. Highly recommended read more

Their response was quick, the technician was very knowledgeable and identified and resolved the issue promptly.

Quality work and expertise. Expensive, yet worth it if you want to be sure the job gets done right.

Five stars for follow through when an old sink stopper broke, was replaced, and then didn't work right the first time. As promised in the company's name, Paul sent someone back to deal with a mismatch of the new stopper with the old sink so I didn't have to replace the sink. Many thanks for good work. read more

I was referred to Guaranteed Plumbing by a neighbor. Derrick did two jobs for us including installing a new bathroom faucet and an ice make. Derrick was great, showing up and completing the jobs on time. The quality of the work was excellent. read more

Our half bath toilet next to laundry room overflowed after doing a wash. Called on Sunday, left a message and had a return call first thing on Monday. Plumber came out Monday afternoon and snaked the line to clear the obstruction. Price was very reasonable and Gary did a great job. Also replaced drain lines under kitchen sink which had a small leak. If and when I need a plumber this is the company I will call. read more

I needed my kitchen faucets repaired and Jean from Guaranteed Plumbing was super helpful. He showed up on time, and gave me great advice on my options. I needed new faucets and the installation was well done. Jean also helped me troubleshoot another issue in the house. I appreciated his attention to detail and his knowledge. I will definitely be calling them in the future for my plumbing needs. read more

We have worked with Guaranteed Plumbing for nearly 20 years. They have provided reliable service on everything from converting our wood burning fireplaces to natural gas, replacing old water-wasting toilets, to emergency repairs when a cartridge blew in one of our showers. In every instance, the service techicians showed up when they said they would, were technically competent, and respectful of our home. And while we didn't aggressively price shop, it always seemed to us that the price charged was fair for the quality provided. read more

What a fantastic company to help us with anything plumbing. Kind, courteous, efficient and especially knowledgeable. Not too expensive either. Wouldn't use anyone else. Victor is amazing! read more

These guys are fabulous. I had an outside plumbing leak near a hose bib on a Friday morning. Although Guaranteed Plumbing was fully booked they were able in a short amount of time to find someone to stop by between jobs to at least stop the leak until more time was available on Monday. Derek came and was surprisingly able to completely fix the problem quickly, although he ended having to do it "live" leaving him with soaking wet trousers. Also very reasonably priced. Nice polite and professional guys. I won't use anyone else. read more

We used Guaranteed Plumbing to service/repair our HTP water heater. Their first time out was spent troubleshooting the issue. The tech was friendly and followed Covid protocol. He listened to our issues and we told him what we had already tried on our own and history with HTP as well. During the first visit he spent almost the full time on the phone with HTP. At the end of the two hours he gave us a website and said we could order parts (he gave us part numbers and did explain going thru this website would be cost effective so we appreciated that). Once the parts arrived we were to call back for install of parts. He also said our gas line was undersized and so we called PG&E that day to come out. First appointment was $430 dollars (for troubleshooting) and our system was still not working. We had PG&E out the same day because they don't mess around when it comes to gas line issues. Interestingly PG&E said unfortunately undersized gas lines are blamed often. PG&E tested lines and pressure against recommended pressure output on the system and gave the all clear. Parts arrived and we called to schedule 2nd appointment. The same tech came out for round 2. He installed the new parts and initially the unit fired up but then glitched again. He was on the phone with HTP again (who frankly wasn't much help) and again there was mention that it still wasn't working due to the gas line. Since he was suggesting the gas line be replaced we asked for a quote for the gas line and also asked for a quote for a new system (if needed). He wrote all of this on our receipt and said we would get us an email with those quotes but that never happened. At the end of the 2nd appointment he seemed flustered and quite frankly we were too. After another $430 charge we still don't have our water heater up and running not to mention the cost of the parts we had to order. My husband called the owner and left a voicemail and no return call. After the no quote, no return phone call we decided at that point we would not have them return. By this point we have spent over $1,000 for the two appointments, and parts, and the system still isn't working. We contacted another company who came out at NO CHARGE. They did say we needed a different part all together and they explained they will charge once we get the part, they Install, and fix the issue. This new company also confirmed the gas line is NOT undersized for the unit and pressure is fine. While Guaranteed Plumbing tried (and did Install two new parts on the 2nd visit) we don't have confidence he knew exactly what he was doing with this particular system. Disappointed that in all we were charged $860.00 by Guaranteed with no fix, and no follow up. read more

My hot water heater went out on a Thursday evening, Friday afternoon I called Guaranteed Plumbing for a quote. They gave me an accurate quote over the phone after sending pics of the hot water heater. I told them I needed it done asap so Paul pulled 2 guys off a non emergency call and they were there within 30 minutes with a new heater. Juan did a fantastic job hooking it all up. His helper also did a great job. They were done in about 2 1/2 hours. Great customer service, talented employees and one happen customer!!! Thank you Guaranteed Plumbing!! John S. read more

Best plumbing company I have worked with. They are so professional and really care to do a good job. Johnathan has been to our house multiple times and always goes above and beyond to get job done correctly. Super knowledgeable and gives great advice and shows you exactly what he is doing to fix issues. He also put in new water heater for us. Their office staff is great too. Use them for sure!!! read more

John from Guaranteed Plumbing was so helpful and responsive in fixing a slow water leak we had. He worked into the evening before the holiday weekend so that we wouldn't be without water. He followed up and communicated with me every step of the way! Highly recommend! read more

You shower valve in the wall needed replacement and a plumber came out and said he would have to go through the tile to replace it. No way! Guaranteed Plumbing sent John out and he took apart the handle and replaced the valve and had everything working with an hour. Great price, professional and adept! read more

Excellent service from Guaranteed over the years. Most recently, Jean performed excellent service for my daughter in replacing a toilet and "angle stops" under the sinks throughout her new home in Danville. Jean is courteous as well as competent. He also finished the job in shorter time than he had initially estimated, leaving us all pleased and satisfied. read more

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! read more

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

Great service. Office staff was courteous and prompt about hearing my needs and thoughts. They were quick to schedule me and when the plumber arrived he was well equipped with the needed parts and knowledge of what was going on. My plumber, Gary, was professional and personable, showed up on time and finished on the early side of our estimate. The work done was as good as I could have hoped for. Thank you! read more

We had excellent service from Guaranteed Plumbing. Jean was on time, courteous, careful to protect our flooring and cabinets while working in our kitchen. He did a beautiful job for us. Could not have had a better experience! Thank you! read more

GUARANTEED PLUMBERS are "The best plumbers!BAD=Drain Doctors- Rocky, charged $1000.00 and didn't fix anything :water went down into other part of house. The bad DrainDoctors said we'd need $6500.00 in new piping and would tear out our ceiling and not repair it afterwards and that we needed a new garage disposal. Well thank God for Guaranteed Plumbing they fixed everything and all the other company was wrong about everything. GUARANTEED PLUMBERS saved us. Thank you Guaranteed plumbers!!! read more

This is a review long time coming, as I've been working with Guaranteed Plumbing for at least the last 10 years. As a General Contractor, I have a HUGE responsibility to my clients in terms of the performance of my subcontractors, and not ONCE has Marcus and his team come up short. We've done around 50 residential and commercial projects, both large and tiny, and his team gives the same attention to detail to both. Proposals are concise, and clearly outline deliverables. If you are looking for the cheapest plumber around, these probably aren't your guys and gals. But if you want an existing problem solved, or a new construction project completed quickly and cleanly without issue, failed inspections, attitude or excuses, sign them up. I really can't say enough great things about Marcus and his team. He really qualifies for a 6th star! Tyson Schroeder Redux Construction read more

We were in disaster mode recently on a Sunday afternoon - toilet flooded, yuck all over the bathroom floor and the shower floor in that same room flooded, too. Gross and we did not have the ability to snake the drain, etc. All three toilets and showers could not be used. Early Monday morning I called our valued plumber - Guaranteed Plumbing, Danville, CA. Immediacy was of deep concern and fortunately it appeared this company holds some appointments on Monday for just these types of weekend emergencies. From the sincere receptionist and the scheduler, within three hours, Ben, from Guaranteed Plumbing, met with my husband and helped solve the issue by using a tool that unplugged our main line. What a wonderful relief. My husband requested that I write a review, as Ben was outstanding, friendly and very respectful of our property. He fixed the issue and we were back in business by noon. The household luxuries we take for granted! Fortunately, Guaranteed Plumbing understands how critical it is to solve plumbing issues, such as these, as quickly and efficiently as possible. As a followup to the main line that is full of tree roots, we have scheduled Ben out again to scope using a camera in the line to investigate just how blocked our main line is compromised. Thank you Guaranteed Plumbing.for such courteous and efficient service. read more

Eleven days with a main line back up and two plumbers later, we were referred to Guaranteed Plumbing. Gary arrived within 24 hours of my call. He identified the problem in 10 minutes. He came back the next morning with parts and fixed the problem in no time. He then ran water down every drain and ran both the washing machine and dishwasher to make sure everything was functioning properly. Very professional, the cost was reasonabe, and he explained everything he was doing along the way. The office staff was also great and I highly recommend this business! read more

They are the best plumbing place in Danville! I tried other businesses, but none got back to me or did the correct job. As a picky person, They were outstanding! read more

Johnny Utz came right on time this morning. He was extremely knowledgeable and fixed everything quickly. He also did some other work outside of plumbing since wr had his time for an hour. I highly recommend guaranteed plumbing and Johnny Utz was great! I will use them again. read more

We love Guaranteed Plumbing! John came out today and fixed our leaky shower head AND our gas fireplace. He was very professional, wore a mask and courteous and kind. I felt completely safe having in our house (during Covid). He was a pleasure to speak with and he's a dog person which made things even better. Highly recommend GP and John! read more

I find having to write this very unfortunate. We had worked with Guaranteed Plumbing several times and had good experiences, yet our most recent experience was so unbelievable unprofessional that I'm driven to write a review. We had two people from Guaranteed Plumbing come out to give us quotes on several different plumbing projects around our home. After we discussed the projects I sent measurements and pictures of the and never heard back, no response, no follow-up, no quote. I called about a week later to follow-up and left a message with Ryan about the details of my project and how I was still waiting to hear. He assured me he'd call me back, but he did not. No word. I am extremely disappointed. read more