Professional Plumbing Work Backed By Decades Of Experience and Master Plumber Supervision.
Whether you're upgrading outdated plumbing or starting fresh with a renovation, NJM Mechanical and Contracting provides reliable, high-quality plumbing installation and replacement services throughout Long Island, NY. Our licensed and insured plumbers bring decades of experience to every job, ensuring safe, code-compliant, and long-lasting installations for both residential and commercial properties.
From installing new water heaters and fixtures to replacing corroded pipes and entire plumbing systems, we deliver precision workmanship backed by trusted expertise.
Complete plumbing setups for new homes, additions, and renovations. We design and install fresh supply lines, drains, vents, and fixtures using high-quality materials to ensure proper flow and long-term reliability.
Removal of old, corroded, or damaged piping and replacement with durable modern materials. We upgrade entire plumbing lines to improve water pressure, prevent leaks, and enhance system performance.
Professional installation of faucets, sinks, toilets, showers, tubs, garbage disposals, and more. Every fixture is set, sealed, and tested for leak-free, efficient operation.
Expert installation and replacement of tank and tankless water heaters. We ensure proper venting, safe connections, and optimal performance for consistent, reliable hot water.
Safe installation of water lines and connections for boilers, washing machines, dishwashers, and other home appliances — all completed to meet local code requirements.
Full plumbing support for remodels, including rerouting supply lines, installing new drains and traps, setting new fixtures, and preparing your space for long-term functionality.
Expert Plumbing Solutions Backed
by Over 33 Years of Experience
Why Choose NJM for Plumbing Installation & Replacement
Expert plumbing installations backed by licensed professionals and decades of hands-on experience.
All installations are completed by fully licensed, insured plumbing professionals who meet Long Island’s strict residential and commercial codes.
Every installation is supervised or performed by a Master Plumber to ensure accuracy, safety, and long-lasting performance.
We use only premium fittings, valves, and piping to ensure your installation meets or exceeds Nassau and Suffolk County code requirements.
Our team works neatly and efficiently, protecting your home during removal and installation and minimizing any disruption to your space.
Decades of professional experience mean we install fixtures, piping, and full systems correctly the first time — with workmanship that lasts.
No hidden charges or surprise add-ons. You’ll receive a clear estimate outlining exactly what your installation includes.
Water Heater & Boiler Safety Testing
Assessment of temperature controls, pressure relief valves, gas/water connections, and venting to prevent hazards and improve efficiency.
Fixture & Appliance Safety Checks
Inspection of water heaters, boilers, valves, shut-offs, and plumbing fixtures to ensure proper operation and safe performance.
Leak Detection & Line Evaluation
We use advanced diagnostic tools to locate leaks, pressure issues, corrosion, and worn components before they evolve into major problems.
Emergency Shut-Off Valve Testing
Ensuring all plumbing shut-off valves function properly in the event of leaks or system failures.
Drain, Vent & Pipe System Assessment
A full review of your home’s plumbing infrastructure — drains, vents, supply lines, and connections — to ensure proper flow and system health.
Code Compliance Review
We verify that your plumbing system meets all Long Island, Nassau, and Suffolk County regulations — essential for renovations, additions, or property sales.
Trusted Plumbing Expertise for Long Island Homes & Businesses
Our Plumbing Safety & Inspection Services Include:
NJM provides advanced inspection, leak detection, and safety evaluations to keep your plumbing system running efficiently, safely, and fully compliant with local codes.
Find HVAC Services Near You!
Service Area Links:
- Long Island
- Nassau County
- Suffolk County
What Our Long Island Clients Are Saying...
Kris
I couldn’t recommend Neil enough! From start to finish him and his team were professional, efficient and experienced. We had a job pulling up rocks and putting top soil down which I know can be a tedious job. We appreciate the work and look
Evelyn Powers
We had an ongoing issue with clogs. My daughter woke up to flooding in her bedroom from her toilet, which was not fun! This was our first time having NJM in our home. Neil was knowledgeable and gave us several options. we chose to have him use the camera to get to the root of the problem. He was able to pinpoint several issues and was able to fix clog and clean out the pipes. Neil and his crew were very professional,
Irene Cheung
I contacted NJM Mechanical because I didn’t have hot water anywhere in my house. Neil was able to diagnose the issue and get to work. My navien tankless water heater is only a year old and still under warranty. Instead of waiting on Navien to send the part so the issue can be corrected, Neil went out, found the part, purchased it,
William Lo
Great experience. Neil came out and took the time to explain everything thoroughly. He was able to fix all the errors on our Navien and have it back up and running. Following up a week later. Neil and Mike came out to redo the Navien system for proper instillation.
Unfortunatley, after there was a gas leak with our Navien system. Neil was able to get
James Farnworth
Neil from NJM was able to get my ac system up and running when others could not. He was honest with me right from the beginning and all costs were discussed before repairs began. Additionally, Neil spent time explaining to me how my system operates and the things I could do to help it run at peak performance. It was quite refreshing to experience a service technician who demonstrated the uppermost
Raul Chardon
Honest professional full of knowledge not BS. Takes pride in his craft and is a master of it.