Costellos plumbing
Company Overview
In San Leandro, CA, and its vicinity, Costello's Plumbing provides superior plumbing services for both home and business owners. Our team boasts over 18 years of hands-on plumbing experience, prioritizing quality in every job. Our main focus is to provide high-quality plumbing services. We ensure quality by employing the best tools, materials, and practices for plumbing installations and repairs. Our offerings are superior to others in the plumbing sector. We work swiftly and effectively without sacrificing quality. You can have peace of mind knowing we are fully licensed and insured.
At Costello's Plumbing, we pride ourselves on delivering the best customer service possible. Our workmanship is of high quality, and we offer it at a competitive price. Our team will evaluate and resolve your plumbing concerns efficiently.
We aim to be your forever plumber if you choose us. We emphasize excellent customer service and addressing your plumbing needs with your peace of mind in mind. We consistently put our clients first and work to present the best options for their needs.
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

Gary and his crew were great! They helped us identify a few issues we had and resolved it in a very timely manner. We started off with clogged toilets 2 days before Christmas - they came out and helped us snake it, pulling out a bunch of roots. They didn't have their camera so we scheduled another appointment for them to come back out after Christmas. They found another clog, but their 100ft snake was not long enough to clear that clog because our main sewer entry was built too far from it. They advised us to put another entry point closer to the city sewer connection for easier access to clearing the pipes in the future. Gary was knowledgeable and provided detailed information to help us make our decision to move forward with the work, without any pressure. Him and his crew of 3 finished the work in 2 days without any disruption to our lives. He provided his advice for maintenance going forward and CDs with the video from the camera footage to show us before and after their work. We are very happy, thank you Costello Plumbing!

On time! Accountable. Professional. Everything I expect from a skilled repairman. I have a old house with old plumbing. Problems galore. Gary was tip top.

Called them today and Gary, owner, came out within a couple of hours. He quickly diagnosed the problem, ran to get a part and fixed the issue. Price was reasonable compared to other plumbers we have used in the past. Friendly, competent and nice. We will definitely use him again.

Gary was great. Thank you for your awesome services. We started changing a faucet and ran into pro lens and he provided a rescue .

I called Gary yesterday and he arrived today exactly on schedule. I had a problem with both my upstairs toilets - one leaked and the other was wobbling. Gary removed both and found that they had not been sealed, they were basically just sitting on the floor with a bit of caulk around the edge. Gary thoroughly cleaned the floors and the under side of the toilets and put in proper seals and replaced the toilets. He did the work very efficiently and left his work area spotless. I would definitely use him again for any plumbing emergency. Forgot to mention he is also a very nice guy.

Lousy job, all they look for money not to do the job, better consider carefully before calling this guys

We had a garbage disposal that was leaking, contacted Costello's, and were able to get an appointment the next day.
Miguel was our service technician, and he was great. Quickly diagnosed that a replacement was needed and explained why, left to pick up the parts, then returned to complete the installation -- all in the same appointment.
Miguel will also talk you through pro's and con's about different choices (what to fix now, what to wait on, etc.) and explain each step of what he's doing.
This is our third repair with Costello's (all for different causes). Highly recommended when you have an emergency leak of any kind!

Very quick response, and the job didn't take overly long. We had them completely repipe our 98-year-old house with copper. Never wanted to have to deal with floods again!
They did a few squirrelly things, which we had to pay to have redone, and they left somewhat of a mess for me to clean up, but basically the job is done and hallelujah for that!
If you are repiping, btw, my General Contractor told me, you are supposed to insulate the hot water lines. They didn't.

It looks like we found our local plumbing superheroes! Quick response, repairs, and future project advice - they're like the Avengers of home maintenance. Exciting to have reliable folks nearby!

Got the handle of my (very old) water main valve broken that was on the off position, so no water going in the house. I used Yelp project and a few plumbers contacted me. Most seem pretty qualified. I ended up using Costellos as they were able to do the fix the same day with reasonable price. The team is very professional and efficient with their work. Word was done very well. Will use them again for my future plumbing needs.