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John I Kostynick Plumbing Corp

About us

Long established plumbing & heating company servicing Nassau County, New York. Member of National Association of Plumbing, Heating, Cooling Contractors & The Nassau County Association of PHCC.

Business highlights

Emergency services offered
70 years of experience

Services we offer

& Air Conditioners., & Installation. HVAC Repairs, & Sink Repair & Installation. Generators. Electrical Service, Basement Flood Clean Out, Boiler Repair, Duct Work, Faucet Installation, Leak Repair, Pipe Rooter, Plumbing & Heating – Emergency Repairs, Repair, Replacements, Toilet, Tub, Water Heater Repair & Replacement, Yard Drain Repair

Amenities

Emergency Services

Yes

Free Estimates

Yes

Reviews
5.028 Reviews
Number of StarsImage of DistributionNumber of Ratings
5
100%
4
0%
3
0%
2
0%
1
0%
Showing 1-25 of 28 reviews
Deena P.
May 2018
5.0
Yes, I recommend this pro
$900
It was a very tough repair and they came in under their estimate. The men were very nice and knowledgeable.

Diane W.
Jul 2017
5.0
Yes, I recommend this pro
I have used this company several times and am happy with their work.

Aviva N.
Apr 2017
5.0
Yes, I recommend this pro
Called on friday made appt for monday morning. Work done quickly. Neatly. Pleasant. Fair price for parts and labor. My new plumber!

David S.
Feb 2016
5.0
Yes, I recommend this pro
$300
We found a leak in the heating system.  They responded quickly despite the bad weather.  Though the source of the leak was not easy to determine, they were able to tack it down and complete the repair successfully.  The quality of the workmanship was excellent and we felt the price was reasonable too.  We will definitely use them again.

Louise Z.
Nov 2015
5.0
Yes, I recommend this pro
unknown

Andrew J.
Aug 2015
5.0
Yes, I recommend this pro
$272
Perfect job!  He arrived on schedule, removed the old corroded kitchen sink drain pipe, and replaced it with new parts.  It all works perfectly now and the plumbing work looks solid.  The drain pipe also has a dishwasher drain connection, which he had to reconnect as well.

Harold M.
Apr 2015
5.0
Yes, I recommend this pro
$400
They were prompt in their response and did what they said they would do. I was satisfied with their service. Their price was on the high side.

JOHN S.
Mar 2015
5.0
Yes, I recommend this pro
$554
unknown

Stephanie G.
Mar 2015
5.0
Yes, I recommend this pro
Have responded immediately with each of 4 leaks over an 8 month period, all from different sources. Very fair prices. Pleasant and trustworthy staff. Gary is compassionate and kind. Have solved the problems that were plumbing in nature, and didn't even charge me on the last call that wasn't a plumbing issue.

Gail G.
Feb 2015
5.0
Yes, I recommend this pro
$2,000
The job went very well.  The men with whom I spoke in the office were very efficient and polite.  The plumbers who came were on time, nice, and did a great job. The job was 2 months ago and everything is great.  I believe that the price that I mentioned above included a one piece toilet and seat.  I have used this company several times and have always been pleased with their work. I didn't rate the price because I didn't ask another plumber so I can't compare their price with anyone else.

June K.
Jun 2014
5.0
Yes, I recommend this pro
$135
unknown

Doris M.
Apr 2014
5.0
Yes, I recommend this pro
$5,425
Gary, the owner, reviewed hit list, offered suggestion and was flexible on price.
Called for quote, man arrived within hours.
Verbal quote given in one day, written soon after.
Pleasant and concerned crew, Lou and Kenny, did everything to order and cleaned up after themselves.



Howard B.
Mar 2014
5.0
Yes, I recommend this pro
$1,300
Excellent professional job

Chi L.
Jan 2014
5.0
Yes, I recommend this pro
$260
Went to bed at midnight, and it was 68 degrees with the heat on. Woke up at 8am to 60 degrees, so the heater must have stopped working close to 8am, since it's only 10 degrees outside. Went down to the boiler and saw the pilot flame was out. Tried restarting it by relighting pilot, no good. Regular plumber had a death in family, so found these guys thru Angies list. Called at 9am and they were able to get me into the schedule for today.
Two guys came, he saw no pilot light also and replaced the pilot sensor. After 20 minutes of working in the cramped confines of the boiler housing, the boiler was back working again.

Maria T.
Sep 2013
5.0
Yes, I recommend this pro
$1,700
The job turned out to be much more involved than originally thought because they had to go through a concrete wall that was much thicker than they thought at first. However the estimate price remained the same. The work was done in a timely manner and they were neat and clean and did a great job

Mike R.
Aug 2013
5.0
Yes, I recommend this pro
The conversation and agreement that we have made has been good so far. He was the best out of the group. They were helpful in coming to an agreement on pricing. The owner is a gentleman. I will review with Angie's List once the contractor has completed the work.

COLLEEN T.
Feb 2013
5.0
Yes, I recommend this pro
$200
It went very well.

SUSAN H.
Dec 2012
5.0
Yes, I recommend this pro
$400
They're great; I love them! They're just so flexible and get there in a timely manner. They don't rip you off. They're just so polite and customer-oriented.

Anna R.
Dec 2012
5.0
Yes, I recommend this pro
$200
The owner came out, and was professional, courteous, and knowledgeable. He fixed the lever/handle on my toilet because it was not flushing, and also addressed the sink issue in the kitchen. When he realized he did not have the appropriate tool, he told me one of his employees would be coming out to fix it, which is what he did. He was also professional, courteous, and knowledgeable. Also, when the owner, Gary, came out, he advised me to change the wattage on my light bulb in the kitchen because the light was flickering on and off.That was above and beyond and I appreciate that.

Jane M.
Nov 2012
5.0
Yes, I recommend this pro
$650
See above

Caryl C.
Dec 2011
5.0
Yes, I recommend this pro
$200
I called them and they came out the same day. The technician did everything he was supposed to do; took the time and fixed it absolutely perfect. This was really an emergency and the technician was excellent. I have used them in the past and they are really very good and reliable. I have never had a problem with them; their servicemen are great and the prices are fair. I will use them again in the future.

Robert S.
Oct 2011
5.0
Yes, I recommend this pro
$1,000
They were excellent. One of the things that stood out about them was that when I called and made an appointment, they were very accommodating, really helpful and very responsive. I did not have any complications whatsoever. Everything is holding up great. The first job cost $600 while the second cost probably about $400. I would rate them highly and would definitely use them again in the future; it is hard to find a good plumber.

RICHARD B.
Sep 2010
5.0
Yes, I recommend this pro
$300
They were called on a weekend and showed up first thing Monday Morning to perform the work on time on budget. They were clean, professional and had the parts in stock ready to go

Joan F.
May 2010
5.0
Yes, I recommend this pro
$140
They were punctual and prompt. They were good serviceman, and responded to my requests. I needed them to come back and fix something on the same day, and they called to let me know they were coming both times.

ROBERT C.
May 2009
5.0
Yes, I recommend this pro
$400
It only took them about an hour and a half. They were friendly. They did the job and they were very efficient.
Showing 1-25 of 28

Licensing

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FAQ

John I Kostynick Plumbing Corp is currently rated 5.0 overall out of 5.

Yes, John I Kostynick Plumbing Corp offers free project estimates.

No, John I Kostynick Plumbing Corp does not offer eco-friendly accreditations.

No, John I Kostynick Plumbing Corp does not offer a senior discount.

Yes, John I Kostynick Plumbing Corp offers emergency services.

No, John I Kostynick Plumbing Corp does not offer warranties.