GNK plumbing services

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Licensed

This pro has verified their business license with Thumbtack.

Licensed

This pro has verified their business license with Thumbtack.

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Zip code

Appliances to hook-up

Materials provided

Pipe material

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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 357 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

Credentials

License verified

Plumber – Master

License state: MA

Background checked

Passed by Jean Kossaifi on Jan 4, 2023.

Services offered

Project type

Hook-up appliances to existing gas lines

Supply new gas lines to home (from street)

Supply new gas lines to appliances (within home)

Supply new gas lines to appliances (outdoors)

Pipe material

Copper

Iron

Steel

PVC or CPVC

Appliances to hook-up

Stove or oven

Outdoor BBQ or grill

Water heater or boiler

Dryer

Projects and media

Reviews

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

Excellent 4.9

240 reviews

5

97%

4

1%

3

0%

2

1%

1

1%

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Read reviews that mention:

Nicholas c.

Sep 18, 2026

•

Hired on Thumbtack

Plumbing Pipe Repair

James D.

Apr 25, 2026

•

Hired on Thumbtack

Jean was at my house within 30 minutes and took care of my job for a great value. He was very honest and sincere about our heating system and how to properly maintain it. We will definitely use GNK for all of our plumbing needs in the future. I already recommended him to my neighbors. Thanks again for your help Jean!

Details: No, repair is not urgent • No, the building is not currently flooded • Part of a larger issue with the plumbing system • House

Plumbing Pipe Repair

Cynthia S.

4 weeks ago

•

Hired on Thumbtack

10/10 service was exceptional! John came so quick and was able to diagnose my problem right away! Highly recommended! Thanks John!

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

Sink or Faucet Repair

Malou B.

Oct 2, 2026

•

Hired on Thumbtack

Details: Boiler • Leaking • Basement • Single-level building • House • Owner

Heating System Repair or Maintenance

Kathy B.

Sep 20, 2026

•

Hired on Thumbtack

Jean was extremely responsive. I appreciated how quickly he assessed and fixed the plumbing issue. I would definitely hire again.

Details: Only one drain has issues • Other issue • House

Plumbing Drain Repair

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