First, love the straightforward business practice. No mystery price tag, just an estimate range and a bill at the end that matches the estimate. Miguel was a friendly pro. Got the clog cleared up within the hour. Would recommend again. read more

Gary was great. He was knowledgeable for the plumbing issue and got the job done in good time. I had to get my water pressure relief valve (PRV) replaced and he had educated me on a few options but also cautioned me against some of the cheaper options thst would break down in a few years since the area that valve in was in direct sunlight. The plastic housings for the cheaper PRV were not a good choice so we ended up getting the brass one installed. He also was able to get another small project done for me in time as well to get a water line setup for me. Gary was professional, quick, and took care of the work with attention to detail. Costellos also got him out early morning so that was great. My issues were resolved the same day and Gary was transparent about pricing. Would highly recommend this company. I wasn't upsold or pressured into spending more than I needed to, and I got all my questions answered too. read more

Costellos plumbing - Photo of the old pressure relief valve that went bad and was replaced. - Plumbing Near Me - San Leandro, California

See all

Miguel and Alex did a ton of work on my condo in a few hours! They were amazing, quick, professional and extremely knowledgeable. They purchased, transferred and put in two new toilets, three sink faucets and all the parts and plumbing that went with them. They had purchased, transported and put in new sink fixtures in and as well as a garbage disposal in my kitchen previously and had done a great job on that! I will be getting future work done and can't wait! I strongly recommend them for any plumbing job! read more

See all

Crisis AVERTED on a Saturday afternoon, all because Gary at Costellos Plumbing answered my call and was able to fit me in as his "last stop" before beginning his well-earned weekend....today, thru Yelp, I found another "Angel who walks the Earth"...!!! When the family is out to visit my in-laws and I get to spend a quiet, peaceful few hours at home, alone, the last thing you expect to happen is an accidental broken fiberglass pipe on our outside irrigation station; yes it flooded the yard, yes, it took me time to find the main shut-off valve and YES, now I know, all I needed to shut off was the backyard water valve....education from Gary at "no extra charge"...!!! Gary was able to replace the broken part and reseal it with instructions to "let it cure" before we turn it back on to give it a test; so tomorrow it will be tested and I am totally confident it will be "just like new"....but he reaasure me if there are any leaks, etc, a call is all that will be required for him to return, inspect/fix...!!! I could not ask for more exceptional service and, that Gary is just a phone call away for any future plumbing needs within our home....thank you again, to Gary and Costellos Plumbing for being here for me today...you guys ARE, the BEST...!!! read more

Costellos plumbing - this was fixed by Gary today...."crisis averted"...!!! - Plumbing Near Me - San Leandro, California

Gary came at 8 ppm and fixed the problem. he was fast and was very polite. great hob

I had a few problems at our house we bought and I called on a Sunday and Gary was honest with me and said they wouldn't be able to come out in a timely manner because they were so busy. It was a holiday weekend, of course. So I called back with the next problem we had and he sent a great plumber, Eddie to install a new bar sink in my kitchen. He was clean, respectful and very knowledgeable, and cleaned everything up when he was done. He did a fantastic job and we are extremely satisfied. I believe I got value for my money. He's coming back for another job. I highly recommend Costello's plumbing company for all your needs. read more

See all

Miguel and Alex were great! I was able to make an appointment the same day. They were both respectful, fast, and explained what the problem was and the plan to repair the issue. Miguel was proactive and let us know about other services he offered and we took him up on the water heater maintenance. We were so happy with them were requesting them for another project. read more

Excellent work by reliable people. They replaced my water heater in no time and with no issues. Highly recommend!

We used Costello's Plumbing this past week to address a water hammer/pressure reducing valve issue. Communication was prompt with Miguel coming by the next day to look at the project. He explained the problem thoroughly and provided an estimate on the spot. We were very pleased with his workmanship and knowledge. We live in an older house and he looked at our entire system, pointing out what needed to be addressed immediately, soon, or later. Miguel and an assistant worked their tails off from 8a to 8p, they were fantastically hard workers, finishing the multiple jobs at our house on the same day. His well stocked truck made for efficient work. All in all we are very pleased with the service and I've already recommended them to family. read more

Had a leak at my Dublin rental and Miguel promptly diagnosed the issue and presented me with options. He then found the part needed and finished the job with distinction. Exceeded expectations. read more

I had the unfortunate experience of having a leaking bath tub faucet. I immediately went to yelp to find the best company and am so happy to have landed at Costellos Plumbing. I got a quick response from the owner and the work was done the next day. Miquel R. and a partner came out to do the work. Miguel was kind, respectful, efficient, knowledgeable and professional. He kept me up to the minute on what was happening and when things were needed. He was very flexible and accommodating of the price. My only sad thing was that they did not leave me my receipt which I would like to have for the 1 year warranty. Hopefully, I will not need to use it. The shower is working better than it ever did and I am very happy with the work that was done. He worked with me on pricing also. I cannot recommend Costello's Plumbing enough and especially Miguel who was awesome! read more

Costellos plumbing - Serious leak - Plumbing Near Me - San Leandro, California

See all

Not too long ago I had a problem with my garbage disposal or something under the sink. I called Costello plumbing on a Monday morning. They were at my house Monday midday and the problem was fixed shortly thereafter. The owner came out and was very informative, assessed the situation and got to work. They also offer a senior citizen discount so I was happy about that but yes, if you have any type of plumbing problems, I highly highly highly recommend Costello's plumbing. They get the job done. They don't railroad you or your budget. I'll be using them exclusively going forward, and you should too. read more

Had an issue with the main drain line in our older house backing up and showing at the lowest points (the bathtub and the toilet). Miguel came out to diagnose the problem, and then fixed the drain issue, replaced a broken junction (and another subsequent issue with the toilet flange rising about 2" above the sub flooring in the bathroom, a leftover from the previous owners). The work performed was excellent and I would recommend Costellos Plumbing for any future work. We were in constant discussion about the work to be done, pricing (it was a value in comparison to a national chain), what was found, what are some future projects to be undertaken. The honestly and upfrontness was good as well. Thank you Miguel, and by proxy, Gary. read more

I tried to replace my outside hose and ended up messing up my very corroded head piece on the pipe. Miguel and Alex came out the next morning and had it fixed in less than an hour! They replaced the whole assembly and now I have a beautiful new shutoff valve (to replace one that wasn't even working) and a new hose bib. Fantastic job! read more

Miguel showed up timely and worked quickly and efficiently. Was very thoughtful and explained the issue, solution and cost clearly. Replaced our water pressure regulator valve and offered other good tips and advice. Appreciate his help. read more

Alex came within the specified window. Checked the issue and explained. He installed a new garbage disposal. Explained the work he did, how to register for the manufacturer's wareanty, and checked for leaks. Checked also the dishwasher connections to make sure no leaks overall. Am happy with work done. read more

Our garbage disposal stopped working. So Miquel came over and got it replaced and drain the pipe for us. Everything went well and Miquel showed excellent customer service. read more

Called Costello's Plumbing Company around 4pm and spoke with Gary, who immediately arranged for someone to come out by 5pm since I needed urgent help with a clogged toilet. The technician, Miguel, was extremely helpful and kept me in the loop the entire time, especially since I wasn't onsite. He shared photos and called me throughout the process so I always knew what was going on. Had I called another company, I likely would've spent more money, but he was honest and fair about what actually needed to be done. I couldn't get any other company to come out since many were close to closing, but Costello's still made it happen. On top of that, the pricing was fair. It's so rare to find customer service like this these days. Really appreciate the honesty and professionalism. Highly recommend! read more

Alex fixed my leaking shower faucet. He was super knowlegable and got the job done well.

I have used Costello's plumbing a few times and have been highly satisfied with their work each time. They are straightforward and their prices are fair. They will let you know exactly what the problem is and what needs to be done to fix it. They always follow up to be sure you are satisfied with their work and that the repairs worked. I highly recommend Costello's Plumbing for both inside the home and outside plumbing. You won't be disappointed. read more

Thr service was excellent and a maintenance schedule put in place to keep the drain clear.

Costellos was friendly, fast, and efficient - installed our new garbage disposal the same day we contacted them.

Miguel and Alex did a great job replacing our plastic water line to the fridge with copper pipe - same-day service and good explanations of everything they were doing, plus helpful suggestions for other plumbing issues around the house! read more

My kitchen sink was clogged for about a day. I got in contact with Costellos around 8:30am, and they were able to send someone to my house before 10am. Alex was great and professional, and he got everything fixed with detailed notes of documenting what was done. Thank you! read more

See all

So glad I chose Costellos. The plumber, Eddy, explained both the situation and my house situation plainly and clearly. When we're debating between the smaller and larger job, Gary Costello came out himself, evaluated the situation and talked me through again, how my house was set up and what it meant. In the end, Gary recommended the cheaper solution. The work was then done promptly and cleanly. Price was also reasonable compared to other options we found. read more

Miguel was great to work with. He's a good communicator and he's prompt. I was having problems with all three toilets in my house having difficulty draining. I thought the problem was a drain obstruction. Miguel came out and thoroughly checked out the drains all the way down to the end of the sewer lateral. Drainage in the pipes was not a problem. It turns out that I had three toilets that were on their last ​ ​ legs. Miguel gave me a very good price for replacing all three. His work was fast, neat and he was careful to protect my floors throughout the house . He completely fixed the problem. I ​ will definitely use him again. read more

I've used Costello's Plumbing a few times and have always appreciated the prompt replies and scheduling. Alex came by today to fix a cracked p-trap. As always, he was clean, professional, and thorough. Fixed the issues in no-time. I definitely recommend Costello's as a place you can trust! read more

We had a problem with our sewer line backing up. Called Costello's Plumbing and talked to Gary. They were quick to respond, called 3:15pm and the plumbers arrived at 5:00pm. The plug line was about 60 feet from our house (our sewer line is 223 ft long). They went right to work, wasting no time and cleaned out the pipe in at 30 minutes. They were quick, efficient and knew exactly what to do to fix the problem. Gary (the owner) himself personally showed up and ran a camera through the line to look for other potential problems. When I need a plumber in the future, they will be the ones I call. I highly recommend them for any plumbing issue that you may have. JMH Castro Valley read more

Very quick and responsive, did the work very well, and clean-up after the work was done. Very flexible and accommodating on pricing. read more

Thank you Costello's Plumbing for helping me with my garbage disposal. I had water leakage under my sink and floor that cause me from using my kitchen sink! Alex, the service technician that came out was polite and respectful while in my home...always used disposable shoe coverings when entering my home. Leakage was caused by a needed replacement of the old garbage disposal. His promptness in going out and getting the replacement and with attention to his details was excellent...awesome! Your advice for a future diagnostics evaluation with my galley kitchen and laundry that share the same pipeline outlet. Calling plumbing services in the pasted has had me exhausting! made a lot of sense to me of your advice. Thank you again Alex, you made my day! So happy I can use my sink again! Costello's Plumbing thank you for answering my call! read more

The response time was excellent. I was quoted a ball park price over the phone for about $400 and when he arrived it was closer to $800 but after some discussion with the technician he did give a 10% discount. He did a good job with replacing the seal to the toilet and resetting but he did not do a thorough job with cleaning out the drain. did not see a camera to view the main drain, so I am sure he just used a machine to rooter root. A few days later we still had a problem with the drain backing up downstairs. I called my brother in-law and he mentioned a local plumber they used and the new plumber said the machine he and the past plumber use is not long enough to reach the end. All the last plumber did was open part the drain and did not clear all out. My new guy had to come back with a machine that was long enough and thus did a fantastic job, showed me with his camera the problem and showed me his work afterwards and had not any issues since. My last guy should of showed me this issue and I would of gladly paid more money to fix. read more

Miguel did an excellent job with replacing our garbage disposal after it began leaking over night. He was quick, efficient, and experienced. I would definitely use Costellos Plumbing again! 5 stars! read more

They did amazing job and super knowledgeable with my plumbing needs!! Gary is a great person and kept me in the loop are what needed to be done and found the best solution for me and my family! 100 percent would recommend him to all my friends and family! Thank you Gary! read more

Excellent customer service-friendly, professional and fair. Alex was great-came in, showed us our options, fixed the problem then cleaned up after himself. read more

Alex came out and replaced the valves under our kitchen sink. We appreciated being able to be squeezed in at the end of the day on the same day we called and that Alex took the time to make sure our faucet was clear of gunk and working properly. We will be scheduling another visit to replace more of our valves! read more

Alex did a great job installing a gas line cap when we replaced the gas stove with an electric. Punctual and friendly .

The folks at Costello's, in particular owner Gary, were knowledgeable, professional, and great communicators. I was able to get my exterior water pipes replaced the day after their initial visit & estimate, and I couldn't be happier. read more

Look no further! The owner, Gary and his team, including Miguel, are responsive, professional, and very helpful. Gary and Miguel always take the time to explain what's needed, and why, which I really appreciate. They've helped us in routine, as well as in emergency situations on several properties, including replacing hot water heaters at our rental properties, gas line re-piping, and yesterday Miguel replaced a toilet, as well as a bathroom sink P-trap at our home, and helpfully inspected other plumbing while he was there. They use quality materials, are honest, and know what they're doing. read more

Did some installation work for me in my bathroom. Went extremely well. Firstly, Costello's was the only company to give me an estimate. Everyone else wanted to do a "site visit" first. ***Secondly, Miguel, from Costellos, arrived and did an outstanding job. I highly recommend this individual as well. read more

Every homeowner's worst nightmare is discovering moisture in your walls & floors without knowing how long it's been there. We noticed our kitchen floorboards warping and pulled back a kitchen cabinet toekick to find still water that looked like it had been there awhile. Frantically we called 3 different plumbing companies to come out, diagnose and quote the job. We were alarmed by the quotes we were given and the scope of job they were quoting (tearing down kitchen cabinets, drilling into concrete to access pipes). Some plumbers looked absolutely giddy to discover the work that needed to be done. I'm so thankful we went with Miguel from Costello's Plumbing- he was focused, empathetic and dependable. Miguel and Alex were respectful of our home, wearing shoe coverings at all times and thorough with their clean up. They were creative about how to approach the work to save us on costs (i.e. working inside the cabinet rather than ripping it out) and explained their process thoroughly and transparently. They saved us 1000+ dollars with their competency, and everything was fixed dependably. read more