Sunnyvale plumbing or Maestro plumbing is run by Simon. The work is substandard and bad quality. He replaced a shower cartridge and just a year later it failed again. When I questioned him, he diesnt stand by his work and charged me to replace it again. Refused to admit thay his shoddy work caused the failure. They domt take any time to diagnose the problem. In anothwr job, called him for a leaky faucet and he wanted to repace it with a cheap quality faucet from home depot, when it just needed a little.tightening. I used to call him because he was cheap, but he showed his true colors. Like others have said, dishonest and untrustworthy. read more

TL;DR: Don't use this guy. He is overtly dishonest, only out to make a quick buck, and likely won't make things right if and when his work causes a problem. In December 2017, I contacted Sunnyvale Plumbing via Yelp message here. I got a prompt response, and the next day, a plumber Shin came and took care of a couple faucets for me. The prices were very reasonable, and the work done was great. The only issue less than perfect was that Shin's English was quite poor; it was often hard to communicate. I had Shin come out another time for a separate issue in June 2018. Again, his work was great. If I had remember to submit a review at that time, it would have been a 5-star review hands down. In September 2019, I had a water heater that needed to be replaced. I called Sunnyvale Plumbing. To my surprise, Shin was nowhere to be found, and instead a guy named Simon showed up. I didn't think much of it at the time since I just needed a plumber, and Simon seemed to fit the bill. He quoted me $1200 to replace the water heater (documented by text). I was unable to be present that day, but a friend of mine "babysat" for me by being on site. To my later surprise, Simon told my friend that the fee would be $1500, and so my friend dutifully wrote the check on my behalf. Only later did I hear about the discrepancy. I didn't raise stink about it since I wanted to be nice, figured that replacing a water heater is hard work, and assumed perhaps Simon encountered some unexpected costs during the project. Now the ugliness began. In my home where the water heater was replaced, slowly over the next several months one shower after another stopped working properly; in all three stopped working. I asked Simon to come take a look, but he avoided me like the plague. In the past he was always very responsive via text; now I couldn't get him to respond. He wouldn't answer the phone or respond to messages. I was confused but assumed he might have some issues going on in life. Finally, I went with another plumber, who quickly figured out that the showers stopped working because Simon's work on replacing the water heater resulted in debris clogging the hot water lines somewhere. I tried to contact Simon again to notify him; again, he ghosted me. Despite having tried hard to give Simon the benefit of the doubt, now I finally understood Simon's behavior; he knew his work on the water heater caused problems but didn't want to have to make it right. After all, he already had my money in hand. Earlier today I texted Simon to ask him to contact me about the above, telling him I was hoping we could come to a mutually agreeable solution. He actually called me to simply say, "Go find another plumber," and hung up on me. So there you have it: This apparently is the kind of plumber and person Simon is. I miss Shin; he was great. Simon is another story. Today, I hired another plumber. He too (like Simon) is Korean and knows Simon and says they used to work together in the past. He said, "Simon isn't very good. Bad work, dishonest person." Yep. read more

Price went way up lately. Have used their services before for years and quality was only OK. A new disposal was installed with leaks. Will not go back read more

Our toilet had a minor leak and the lever handle is not working well. On Aug 2, 2023, a Sunnyvale Plumbing technician came to fix the issues and installed the toilet tank repair kit. He also adjusted the toilet lever handle. The price of the fix was quite expensive. But, the lever handler was still loose. We called Sunnyvale Plumbing, on Nov 11, serviceman replaced the chrome lever handle with a brass one without our consent. The brass color does not match the rest appliances. The labor cost of the repair was quite expensive. He told us the repair after a 90-day warranty time expired. We were puzzled as to why the lever handle issue was not fixed in the first place. The newly installed brass lever handle work has a 180-day warranty. The inconsistency of the warranty policy and workmanship lacks professionalism. When I first called the owner Simon to discuss the issue, he even hung up on me. He is not treating his customers right. read more

Could not ask for a better plumber experience. Like an idiot, I overloaded our garbage disposal and suddenly the sink started backing up with... backed up sink water. Gross. I did my due diligence and Googled around in an attempt to make sure I tried all the things short of actually disassembling the pipes under the sink. No dice. I called Shin at Sunnyvale Plumbing (though the business card he gave me says Ace 1 Plumbing) and he responded **immediately** ... he said he was at a job but he could call me back in about an hour. He called me back in about 20 minutes. He said he'd be over in about 30 minutes. He was over in 7 minutes. He came in, looked at the situation, quoted me a very reasonable amount ($100 for plumbing is pretty darn reasonable) and then he set to work. Less than 30 minutes later he had disassembled the whole underside of the sink, cleaned it thoroughly, and reassembled the whole thing. Seriously. Fast enough that I was still able to go out to dinner with friends! Amazing. read more

The response was really prompt. They came earlier than the schedule with checking-in ahead of time if they can come early (something that I really value a lot). They asked many questions to check the problem thoroughly and gave me some options and recommendations. I will definitely call them if I got a same/similar problems. read more

Sunnyvale Plumbing scheduled but missed appointment without before or after followup. I called Sunnyvale Plumbing and scheduled an appointment for 5pm today and they confirmed. But at 5pm tenant told me they didn't show up. At 5:30pm tenant asked if they are still coming, they said no, because a previous work didn't finish. At 7pm I checked with tenant to see if they made it, tenant said no shows and no proactive follow ups. This is a scheduler issue. - It's totally understandable that a noshow happens sometime, but it would show much more care about clients if they can proactive call and update the status. read more

They came out to see and gave me a free quote. It was on par with another plumber place which quote over txt. As they came out, so I used them. Big MISTAKE!!! The bill at the end was 75% higher than the quote!!! When I txt them to ask the reason for the increase, they txt back because it's needed. I won't mind so much if they call me to let me know in advance or while they are working on it. No, nada, Nothing!!! Now they stopped respond to my txt. I will be forced to pay the bill but it's unfair. They came out and look at the situation and it's ridiculous to be so much higher. If they call me before the work I still will do it, but this is just shady business. So watch out of their bait and switch tactics! read more

First the positives. I contacted them fairly late Saturday afternoon (4 PM'ish) and he was here within an hour. He diagnosed the problem quickly; we had a cracked black pipe that was leaking in the crawl space. He replaced about a 3 foot section and snaked the rest to clear out the gunk. When all that was done, it revealed another leak, and he fixed that as well. It was a tough job because the area where he had to do the work was difficult to access via the crawlspace. The drawback. Other reviews have mentioned a heavy accent. The guy who came to our house didn't just have a heavy accent; he spoke very little English...although I'm guessing his Korean was impeccable :-) . It was frustrating for both him and for me because he couldn't effectively communicate the plumbing problem in English. At one point he called a co-worker to interpret, though the co-worker's English wasn't too much better. Bottom line is that he was here quickly, diagnosed the problem, and got it fixed, even though it took him until almost 8 PM on a Saturday night. I was very happy to get the problem fixed the same day, but if you use him you should know that communication may be a real issue. read more

Horrible experience. We agreed to meet at my rental property at 9am today. He shows up at 8:30am and starts knocking on the designated apartment doors. (I provided him an email with the apartment #s and specific repairs). He proceeded to fix something not on the list that a tenant tells him about to relight a pilot light on a wall heater (which I can do in 5 minutes). He wants to charge $65 for this. He leaves at 9am for some reason, my wife is there to open up the doors waiting for him, and she is busy calling other plumbers, I call him on his cell and leave a vmail to ask what's going on. He then shows at 9:30am and then says it's $65 for the pilot relight and $485 to unplug a toilet and $85 to install a faucet sink. At this point, my wife settles with him and pays him $40 cash to go away. Bad, Bad experience. read more

Called them on a Monday for service on a Wednesday. No problem. I then changed it Tuesday around noon to the same day at 2p. He arrived five minutes early (!!). Mine was an easy fix; the kitchen faucet needed to be tightened. He gave me a fair quote, and then quickly and efficiently fixed my problem. When I went to let the guy into my building, the first thing he did was give me his business card, which set my mind at ease. When he walked - er, race walked?? - to my door with all his stuff, I practically had to run to keep up with him. He was organized and knew his stuff. The person on the phone (every time) spoke English without any problems. The plumber himself did not speak English very well, but he made sure that I understood him. He even drew me pictures to be absolutely certain. All in all, very pleased. Would totally use them again for future work. read more

Called this plumber around 1 pm on a Saturday and scheduled an appointment for 5 pm. 5:20 pm rolls around and we follow-up with a phone call. The same person answered the phone and, he didn't apologize, make excuses or even address the tardiness, he merely stated the plumber was on his way, would arrive in 10 minutes and hung up. At 6:30 pm, we called again, same person answered and we could hear much background noise, but, he never spoke into the phone. After about 5-10 "hellos" and "are you there?" we quit our efforts. Big-time losers... read more

No show & hard to communicate as they speak very limited English. Booked them to do some work at a Rental Property at 8am following morning. 8:30am he calls me and says he will be there in 20 minutes. 2 minutes later I get a text saying "I'm not coming". No explanation, no reschedule, nothing. Left my tenant hanging. Thanks for that. read more

My aging mother needed her kitchen sink unclogged so I called Sunnyvale Plumbing. I was told someone would be there "for sure" between 7:30 - 8pm. At 8:30pm I called and was told that his boss was the one who was coming and he was on a job that ran long so wasn't coming. No call, no nothing. Sink still clogged. Totally unprofessional. read more

Clogged Drain, cleaned in 30mins by a very competent and friendly man. Reasonable prices. Will use again. He was very careful about not scratching my tub. read more

His english is not good, but he knows what he should do and finish it fast and nice. And he come to your home in a short time.

I called Sunnyvale Plumbing to replace some copper piping for a water softener that had a pinhole leak. Mr Shin showed up promptly at the appointed time. Communication was a little challenging, but workable. Worst case, I would assume you can call his colleague at the main number (I didn't need to). While he was here I had him do a few extra items (replacing old shut off valves with 1/4 turn ones; snake out a slow running toilet). The repairs were done quickly and professionally. He is very thorough and leaves the workspace clean. The rates were very fair, they came on short notice, and and the work was well done. What more could you ask for? I'm very satisfied and would definitely use them again. read more

Let me set the stage. The night before New Year's Eve my wife and I heard loud persisting high pitch swishing sounds from under the kitchen. I immediately checked out the crawl space, and I saw a large amount of water pooling under my house. The swishing sounds were very loud but I couldn't identify the leak source given the large amount of water. We were worried because we were going to throw a New Year's Eve party the next day, but we weren't sure what to do about this large leak. I sent out a few Yelp requests late that evening, and this business replied early the next morning. I texted him a few pictures and videos and he agreed to check out my leak immediately on New Year's Eve! He was at my house within 30 minutes and after 2 hours my leak was fixed. He was this older Asian man and his English wasn't great, but don't let this deceive you. I was extremely impressed with his work. He even moved my refrigerator by himself! His price was extremely fair especially on a holiday that nobody else was willing to work! I will definitely be contacting him again for my future plumbing needs. read more

I have been working with Sunnyvale Plumbing for several years. Every time we need a plumber in the our home we call them. They are fair-priced, fast and provide good service. read more

We had a blocked main drain which was causing toilet/shower/sink to back up on a weekend. Called and he offered to come even sooner than I thought possible. He got everything unblocked within 30-45 minutes. Everything worked great and he provided a guarantee on his work. Price was very reasonable, especially given the dire state of our drains at the time. read more

I called this place after the emergency job done by another plumbers 48 hours ago came back. This plumber was extraordinary. He singlehandedly climbed up the roof to snake out the blockage in 96 degrees temperature on Sunday afternoon. I was concern for him because the weather was hot. He unclogged the drain and followed up with clearing the main outside the house. He cleared up my problem where 2 guys couldn't do it couple nights ago! Will definitely use him again!! read more

Hi guy is supper fast and the first few times we called him out it was great. Problem with this guy is that he has very inconsistent pricing. When he quotes you a price..it's not like this job will cost $75. He'll look at you and say $80 ok...as if to wait for your reaction or wait for you to bargain with him. the first few times his pricing was reasonable, then on subsequent visits, it got more expensive for seemingly easy jobs. I may still call him, but i'm not longer a loyal customer because of my last experience. I'll be putting future jobs out for bid. read more

Seriously, someone left a one star review because his voicemail was full? Let's be fair and reasonable, people. This is someone's business you're messing with. Go see my review for Tungsten Plumbing if you want to see what a one star review is. I had to use them for a project only because the gentleman at Sunnyvale has a language barrier that I was concerned about for that particular project. A year later I am still kicking myself for not using him. I have been using Sunnyvale Plumbing for a decade. He is honest and fair. In my first encounter, I had first brought out two other plumbers who could not unclog a pipe. One spent an hour and broke his snake. He wanted to charge me for the honor, then come back THE NEXT DAY with another snake and charge me more. I got in a fight and had him leave. Sunnyvale came out, gave me both a time and cost quote. The clog took four times his time estimate, BUT he abided by his quote. THAT'S when I knew I had found a plumber I would be using for the rest of my time here. I have a home where the previous owners did some creative piping (I'm slowly fixing that) and a daughter with long hair. I have needed Sunnyvale Plumbing out many times over the years and he has always been quick and cost-efficient. He was just out yesterday and only charged me $50 for unclogging a drain. You tell me where you can find another plumber who charges that. He suggested other work he could do that was more, but I declined...what business doesn't try to get other work? It's just good business and if I had taken some of his advice years ago (I'm moving soon now), I might have saved myself some visits over the years. read more

My Mom had a bad plug at the drain out of her kitchen sink. It was so bad the water would come out of the wall by her bathroom. We called a plumber to come snake it. They did and it worked for a couple of days and they had to come back again. They ran a camera that cost her $400 and said they would need to cut up concrete and it would cost her between $5k to $26k!!! She is 92 years old and on a very limited income. I went to Yelp to get some different quotes, I came across Mr. Shin who had very good reviews. I called him to see if he could come give me a quote, it was almost 5pm, I figured it would be the next day. Nope, he was over at my Mom's house in 1/2 hour. His English is not that great, so it was hard to understand him. But I gotta tell you, he located the problem real quick and told me it would cost $380 and he should have it done in 2 hours!! I didn't believe it, but he did it! Mr. Shin was very professional, very fast, showed me everything he was gonna do, and did a little more without charging my Mom for it. I would recommend him very highly!!! I give him a very solid 10 & all A++++++++!!! read more

Very good service - came quickly and got the stuff done in 30 minutes for a clogged line near my kitchen and washing machine. He shared his daughter's violin performance on YouTube - Elizabeth Aoki. Can't believe he earns to provide best education for a very talented violinist. read more

Excellent service! On-time and friendly service. Great estimate (half the other places I called) and got the job done as promised. read more

Punctual. Arrived on time and gave me a very reasonable price upfront. Had to take out the toilet, got the toy out and I wasn't broke afterwards. This would've easily cost twice with Roto-rooter. read more

Great service. My kitchen sink clogged up twice in two weeks. Tried Drano and thesnake and the drain is still very slow. Text the number with address and Shin showed up in half an hour. Did a decent job and even cleaned under the sink. read more

WOW! One of the most knowledgeable, hard working and polite plumber we've every hired and we've had a few. We were very impress with his knowledge of the problem. He was in and out in no time. It's definitely worth the slight communication problem. We absolutely recommend Sunnyvale Plumbing for anyone who wants good service for a good price. Thank you! read more

my hot water pipe below the sink broke last night and I called them today (Friday) at 8:45 am. the guy on the phone (Mike) spoke good English and scheduled an appointment between 9:00 and 10:00 AM!!!!!! If that is not impressive, i dont know what is. the guy (Chen (?)) showed up at 9:15 AM and was super fast in replacing the broken pipe. He didn't speak much English but rather drew a lot of pictures :). The pipe was quickly replaced and he was out of the door by 9:45 AM!!! And the best of all, the quote was very reasonable and I even made it to work on time!!! I would certainly hire them again! read more

Prompt service and most competitive price. Amazing and clean job - called for kitchen faucet replacement. read more

My experience was similar to the other postings. I needed a repair for a bathroom sink. The Korean technician arrived at my door in less than 1/2 hour. His English is not very good, but I did not call him to have a conversation. He is an excellent plumber! The job was done in no more than 20 minutes and the total charge (for everything) was $65. The bill also included parts that would have cost me ~ $30 if I had to buy them at my local hardware store. I was completely satisfied with the price and quality of the work, and will definitely call Sunnyvale Plumbing again for my future plumbing problems. read more

I came home to discover my kitchen sink was backed up, it was 4:30PM and I really wanted to find someone to come out ASAP to avoid hanging around next morning waiting for a plumber. I called Sunnyvale Plumbing based on the yelp reviews, Shim showed up 45 min later. His English is not great but he got to work immediately, he had all the right equipment and had the sink in working order in no time. He did a thorough job and charged $75, which was a great price for great service. Very nice man, some of these snarky reviews are disrespectful to this man (racist in nature) and should be removed from Yelp as a violation of their guidelines. To yelp's credit I did flag one of the reviews and they removed it. I would definitely call Shim again. read more

Called Sunnyvale plumbing for a leak on the washing machine faucet from the wall. It was nothing urgent. The plumber arrived at the time specified. But like someone else commented, the pricing is very inconsistent. He saw the leak and quoted me 85. Then when he started to unscrew the faucet he saw that the whole faucet had to be unscrewed - so then he quoted me 100. Then after unscrewing the faucet he saw that the pipe was rusted and needed to be replaced, so then he quoted me 150. While I got the job done from him, the price kept going up on minor new discoveries. I agree that until it is opened the plumber may not know what to expect but I recommend he wait until he diagnoses what the problem is before quoting. He did a good job in the end, and I may use him again but not a loyal customer. read more

Great, courteous service! A pleasure to do business with.

I've used them twice for a rental home in Sunnyvale. My experience was the same as all other reviews; English on the phone, but the owner (Korean) doesn't speak English. Very reasonable price and quick work, fast response time. But, when I just had them out for a third job, not so good. This was to repair work he did last February. He told my tenant that we needed to replace the kitchen faucet. It was just worked on and he replaced parts in it and he repiped the sink drain (Feb 2011). We said we would go take a look before he did any work. All it needed was a new hose, actually just a washer. But then when we did the repair and were checking for leaks, found that the sink drain basket was leaking and has been leaking since he replace it last February. It was missing a gasket and wasn't sealed well with putty. Lastly, my tenant asked him if he knew about washing machines because it was leaking and he was there. He told her she needed a new one. It's not very old and there is one piece that needs to be replaced where the hose connects to the washer. Maybe he was having a bad day? But, I probably won't call them again. read more

I needed to replace my kitchen faucet and repair some leaks below my kitchen sink. I called in to schedule an on-site estimate and was pleased to see that it would be free and that the plumber could swing by later that day. The quoted price was reasonable and the plumber was able to fix the problem in a couple of hours. The plumber understood the problem quickly, explained to me exactly what he was going to do, and then got to work. Overall, I'm really happy with the work and would recommend this business to anyone in need of a plumber. read more

Shin is outstanding his responsiveness, professionalism and skill in work. Not only did he fix our broken front lawn pipe bust but also ensured that the pipes withi the home and sprinklers were working. Shin made extra 2 trips to ensure everything was working post the fix. I would strongly recommend him for his job. There may be some language barrier but he never gets frustrated so I would not let that come in between - explain patiently the problem and he works his magic! read more

Best drain and sewer work done for me. During the past 5 years, I have used more then 5 (contacted much more, 15-20) top rated plumbing services from Yelp around San Jose / Sunnyvale area. This one tops them all! WORK: Slow drain in sewer, and replace a section of rusted 2" iron drain pipe. --PRO-- You pay almost the lowest price but get the best work done. 1. Slow drain: Do the drain cleaning work VERY THOROUGHLY. This guy is the only plumber that uses a drain cleaner blade, all others only used bare cable without cleaner blade attached. This makes huge differences, because without cleaner blade, the snake cable can only make a small hole through the grease, and your drain will get clogged much sooner -- I think other plumers do these purposely. He also breaks up the obstruction as thoroughly as possible, and do it through both kitchen and laundary vents (through roof). Other plumbers either do very swiftly or only do one. 2. High quality piping work. We got rusted 2" iron pipe replaced by PVC (~ 6" long). The quality of his work and parts he used both are very good. It also comes with 1y warranty. 3. Very polite and patient. 4. Cost is good. Actually the lowest price I every get. Slow drain for $90. Fixing pipe $100. --CON-- 1. This guy speaks very limited English. I'm ok to use drawing board to communicate the fixing plan with him. If you don't, maybe you should reconsider. 2. May not be on schedule Personally, I do not experience the issue. But my friends do. I feel this is partially a communication issue. read more

I called them and Shin was here in 45 mins. They are very reasonable and honest. Charged the minimum i.e. 65$. On top of it also gave additional 1-month warranty for the fix. read more