Residential & Commercial Solutions
Plumbing, Heating, Cooling & Contracting Services on Long Island, New York
Your property deserves dependable, expert care. NJM Mechanical & Contracting brings plumbing, HVAC, and contracting together under one roof, serving Long Island’s Nassau and Suffolk County with a single, coordinated team. Whether you need urgent repairs, efficient new installations, or a full renovation, our licensed and insured experts deliver seamless service with reliable workmanship for homes and businesses.
Reliable plumbing services for residential and commercial properties. From leaks, clogs, and backups to full system installations and upgrades, our licensed technicians provide fast, accurate work that keeps your water systems running smoothly.
Why Long Island Homeowners & Businesses Trust NJM
Serving Nassau and Suffolk County with licensed expertise, NJM provides seamless plumbing, HVAC, and contracting solutions backed by 33+ years of proven results.
NJM Mechanical and Contracting is fully licensed and insured across all plumbing, heating, cooling, and general contracting services. Our credentials protect your home or business and ensure that every job is performed according to local and state regulations. From complex plumbing installations to HVAC repairs and construction work, you can count on professional service that meets the highest safety and compliance standards—no risks, no shortcuts, no unqualified labor.
Your project is overseen by licensed Master Plumbers who bring advanced expertise in system design, complex installations, gas line safety, and code compliance. This ensures that every valve, fixture, line, and connection is installed with precision — reducing the risk of future failures, violations, or costly repairs.
As TASK 86/87 certified professionals, we are trained and authorized to handle all gas piping work, inspections, and safety checks. This certification verifies our knowledge of proper installation techniques, pressure testing, emergency shut-off procedures, and compliance requirements — critical for keeping your home or business protected from hazards.
Plumbing and HVAC emergencies can cause major damage if not handled quickly. Our team is on call 24/7 to respond to burst pipes, sewer backups, gas odors, no-heat situations, and critical system failures. We arrive prepared to diagnose the issue fast and prevent further damage to your property.
As a full mechanical contractor, we provide complete plumbing, heating, and cooling solutions for homes and businesses — including installations, repairs, upgrades, diagnostics, water systems, boilers, furnaces, AC units, and more. One team, one company, handling every mechanical need.
We understand the unique needs of homeowners, property managers, restaurants, offices, retail spaces, and commercial buildings. Our services scale to any size property, with solutions tailored to occupancy, usage, and building requirements.
We use high-quality materials and advanced diagnostic tools to ensure long-lasting results, from plumbing systems to HVAC installations.
With over three decades of experience serving Long Island, NJM brings proven craftsmanship and problem-solving expertise to every job. We’ve handled thousands of plumbing and HVAC repairs, installations, and upgrades across homes, commercial buildings, restaurants, and industrial properties — giving you seasoned technicians who know how to get it done right the first time.
We provide honest estimates, clear explanations, and straightforward pricing for every service. No surprises, no hidden fees — just reliable guidance so you can make informed decisions with confidence.
Proudly Serving Long Island and Surrounding Areas.
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.
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