Costellos plumbing
Company Overview
At Costello's Plumbing, we offer top-notch plumbing services for homeowners and businesses in San Leandro, CA, and nearby regions. We bring more than 18 years of plumbing experience to the table, ensuring quality service. We prioritize delivering exceptional plumbing services above all else. We achieve this consistently by utilizing the finest tools, materials, and methods for plumbing installations and repairs. We stand out in the plumbing field. Our approach is to deliver fast and effective service without compromising on quality. We are licensed and insured, ensuring your safety and peace of mind.
We take pride in our ability to offer top-tier customer service at Costello's Plumbing. We deliver quality workmanship at a fair price. We will assess and address your plumbing issues effectively.
If given the chance, we will be your go-to plumber for life. Our focus is on customer service and resolving your plumbing issues while keeping you comfortable. Putting our customers first is our mission, and we aim to provide the best solutions possible.
Business Services
- Drain installation
- Drain repair
- Faucet installation
- Faucet repair
- Garbage disposal installation
- Garbage disposal repair
- Gas line installation
- Gas line repair
- Hot water recirculation pump installation
- Plumbing inspection
- Plumbing installation or replacement
- Plumbing repair
- Sewer installation
- Sewer repair
- Sink installation
- Sink repair
- Sump pump installation
- Sump pump repair
- Toilet installation
- Toilet repair
- Water heater installation
- Water heater repair
- Water pipe installation
- Water pipe repair
Business Location & Hours
Mon: | 7:00 AM - 9:00 PM |
Tue: | 7:00 AM - 9:00 PM |
Wed: | 7:00 AM - 9:00 PM |
Thu: | 7:00 AM - 9:00 PM |
Fri: | 7:00 AM - 9:00 PM |
Sat: | 7:00 AM - 4:00 PM |
Sun: | Closed |
Recommended Customer Reviews

Made a 5-star review on thumbtack but mistakenly spelt the company ""castellos"". Whoops! Hope this review makes
up for that mistake a bit.
No words for how impeccable their services were this evening...Trust me. It is rare that I have no words to say! . Thank you so much to ""COSTELLOS BUT NOT ""Castellos""""
Special shout out to Miguel, the service technician, for his high level of efficiency within the demanded needs of any business- customer service, speed, quality building rapport/social abilities and for simply just being courteous and friendly . Miguel brings forth a positive additional factor ""I LOVE what I do and I got you,""
and makes you, the customer, feel that true nature he presents.
CP will be my local go to plumbing service provider when needed.
Thank you again Miguel and everyone with Costellos Plumbing!!!!!

Gary Costello answered when I called yesterday evening for a clogged kitchen sink , gave me an appointment for early next day 9-11am, he arrived wearing a mask & shoe coverings, which was appreciated. He brought his snake machine through backyard to the clean out & ran it 50 ft, 2 x said the clog was at 35 ft. Explained everything , charged $225 less 10% for a total of $202, (the most I've ever paid for this) , he also shared recommendations to help keep pipes clean longer , a biodegradable substance which I immediately ordered on Amazon, he hosed down & cleaned area. Work has 30 day warranty. Happy with his service.

We hired Costellos for a plumbing job. We contacted Gary for an initial assessment. It was Miguel who showed up the next day for an inspection. He was very knowledgeable and didn't even charge for his visit. After speaking with few other plumbing companies , we fet to go ahead with Costellos as Miguel made an impression on us in terms of knowledge and honesty. We specifically asked for Miguel, Gary was very accommodating and sent him on his earliest availability. Miguel did a great job fixing our problem . He was very polite, efficient and seemed to know what he was doing. They cleaned up after the work was done. I would recommend Costellos and hire them for any of my future needs.

We contacted Costello's plumbing on Thumbtack at 1pm on a Friday, but 1pm the next day our plumbing issues were fixed!

We didn't have heat or hot water for 2 days. After my husband trying and failing on finding the issue, and PG&E declaring it wasn't an emergency and that their next appointment is in a week (not gonna happen with 2 kids) we looked through Thumbtack and discovered Costello's Plumbing. Within an hour of messaging them through the app, Miguel showed up! I was blown away by the responsiveness and punctuality.
Miguel was professional, detailed and very informative, walking us through all the things that needed fixing. He even caught a water leak that was just starting.
We ended up replacing the entire tank and he even waived some fees. Definitely will recommend them next time anyone has plumbing issues!!!!

I've used Costello 4 times now, (Snaking drains, fixing toilet, replacing gas valve for new oven). They communicate very well and will text for appointments (wish I love!) They are reliable, kind and know what they are doing. Their pricing is very fair and competitive with pricing in SF and will give you a fair estimate on the project ahead of time!

Thank you Costello Plumbing for being so responsive. I needed the backyard hose valve replaced and you came the next day. The plumber, Miguel, was professional and explained everything he was doing along the way. The repair took less than 45 minutes which was great.

I was very happy with the work they did moving my tankless water heater. Punctual, competent work, reasonably priced, and overall just nice guys.

I found this company after 8 pm after on outdoor pipe burst and I had to turn the water off to the house. They called me back before 11 pm and showed up at my home by 9 am It was a big job, completed beautifully. I am grateful. The water is back on in no time really. Miguel was kind, focused and easy to talk with.

Had an issue with my dishwasher. Great service! Very friendly and wanted to be helpful. Will be my go to from now on. Thank you!