GNK plumbing services

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Why this pro?

This pro has been in business for 20 years and provides plumbing pipe installation and repair services, along with sink and faucet work. Customers say they're clean, professional, and responsive.

Summarized from the pro's profile. Review their profile for the latest.

About

I'm a Master Plumber. I provide Quality and Perfection. That is my number one goal. I do the job correctly and professionally. I'm not the cheapest, but I am skilled at what I do. Notes : We charge a $100 service fee, but if GNK Plumbing is hired for the job the fee will be waived. Monday to Saturday from 8.00 Am to 6.00 Pm

Overview

Current Top Pro

Hired 324 times

Background checked

License verified

2 employees

21 years in business

Business hours

This pro hasn't listed their business hours.

Payment methods

This pro accepts payments via Cash, Check, and Credit card.

Top Pro status

Top Pros are among the highest-rated, most popular professionals on Thumbtack.

2025

2024

2023

Services offered

Property type

Home

Multi-unit building

Office / business

Commercial

Projects and media

Reviews

Customers rated this pro highly for professionalism, work quality, and responsiveness.

Excellent 4.9

213 reviews

5

96%

4

1%

3

1%

2

1%

1

1%

Read reviews that mention:

Gary P.

Mar 16, 2026

•

Hired on Thumbtack

I had a great experience with GNK Plumbing & Heating while working on my dishwasher replacement project. Jean was incredibly prompt, professional, and quick to respond to my request for help. To my surprise, he even showed up the very same day, which made the whole process much easier and less stressful. The work was done efficiently and with great attention to detail. I truly appreciate the fast service and excellent workmanship—thank you, Jean and the team at GNK Plumbing & Heating, for the great work!

Details: No, repair is not urgent • No, the building is not currently flooded • House

Plumbing Pipe Repair

Laura F.

Jun 2, 2026

•

Hired on Thumbtack

Jean got right back to me so I scheduled with him for the next day. He came and found no leaks, which is good but he also checked out all the plumbing and changed a part in the toilet so the water would stop running all day and night. He's a nice man and he doesn't try to sell you anything that you don't need. He's our new plumber going forward!

Details: No, repair is not urgent • No, the building is not currently flooded • House

Plumbing Pipe Repair

Maria V.

Apr 13, 2026

•

Hired on Thumbtack

Details: No, repair is not urgent • No, the building is not currently flooded • Other pipe issue • Sink • House

Plumbing Pipe Repair

Bill B.

May 14, 2026

•

Hired on Thumbtack

Jean at GNK Plumbing was hired to replace a kitchen faucet. Jean is responsive and showed up within a day after being initially contacted. Upon arrival, he got right to work and worked through a few minor problems he encountered replacing faucet. Jean also noticed and replaced a leaky outside spigot turn-off valve located in my basement. Jean does quality work for a very reasonable price. For example, another larger plumbing company quoted me a price 3x more for the same job. You will not be disappointed by hiring Jean for any of your plumbing projects.

Details: 1 sink • One handle controls both hot and cold water • 1 faucet • A month ago or longer

Sink or Faucet Repair

Olga F.

May 30, 2026

•

Hired on Thumbtack

Great job! We appreciated the punctuality and very professional communication, but above all - the advice we received on how to maintain plumbing in our home.

Details: Yes, repair is urgent • Only one drain has issues • Unpleasant odor • House

Plumbing Drain Repair

Credentials

License

License type: Plumber – Master

License state: MA

License verified on 3/6/2026

Background Check

Jean Kossaifi

FAQs

What should the customer know about your pricing (e.g., discounts, fees)?
I offer multiple options with different proces and offer discounts depending on the job
What is your typical process for working with a new customer?
meet to customer assess the issue and discuss the options for the solution and make sure the customer is comfortable with our work
What education and/or training do you have that relates to your work?
I completed my journey license and master license. I have attended trainings around boilers and I complete yearly trainings to stay up to date with the latest procedures