GNK plumbing services

Top Pro

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Zip code

Client provides materials and parts?

Dishwasher type

Drain access and electrical lines

Responds in about 1 hour

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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 299 times

Serves Methuen, MA

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 work quality, professionalism, and responsiveness.

Excellent 4.9

193 reviews

5

96%

4

0%

3

0%

2

2%

1

2%

Read reviews that mention:

Gary P.

3 weeks ago

•

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

Burak B.

Jan 2, 2026

•

Hired on Thumbtack

Details: Replace an existing toilet • 1 toilet

Toilet Installation or Replacement

Marianne F.

Dec 14, 2025

•

Hired on Thumbtack

Details: 1 sink • Separate handles control hot and cold water • 1 faucet • Less than a week ago

Sink or Faucet Repair

Dennis P.

Nov 14, 2025

•

Hired on Thumbtack

Details: Replace an existing toilet • 1 toilet

Toilet Installation or Replacement

Prem P.

May 12, 2025

•

Hired on Thumbtack

Details: Point-of-entry filtration system for entire building • I would like to discuss with the professional • House

Water Treatment System Installation or Replacement

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