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NJM Mechanical & Contracting

Plumbing, Heating & Cooling In Farmingdale

Farmingdale is three places at once — an incorporated village, South Farmingdale beside it, and East Farmingdale over the Suffolk line in our own Town of Babylon. Which building department your job goes through depends on which one you are standing in.

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Farmingdale

Plumbing, Heating & Cooling Across Farmingdale

Farmingdale is three places wearing one ZIP code. The Village of Farmingdale is incorporated, and sits in the Town of Oyster Bay in Nassau County. South Farmingdale is unincorporated, and is also Oyster Bay. East Farmingdale is over the Suffolk line in the Town of Babylon — the same town as our shop. Which of the three you are in decides which building department your job goes through, and it is not obvious from the address.

What the three have in common is the housing. Roughly two thirds of the homes in 11735 went up between 1940 and 1959 — post-war Capes, ranches and expanded Capes that are now sixty-five to eighty-five years old. That is the age where original galvanised supply, cast iron waste and first-or-second-generation heating plant all reach the end of the line at roughly the same time, usually within a few years of each other.

24/7 Emergency ServiceLicensed & Insured
  • Master PlumberLicensed to pull permits
  • TASK 86/87Certified for gas work
  • Navien NSSFactory-trained on tankless

22+ years on Long Island · Plumbing, heating, cooling, gas and contracting under one roof

Before you call

Two kinds of visit. You’ll know which before we come.

We don’t charge to quote a job. We do charge to find a problem nobody has identified yet. Which one you need — and what it costs — gets agreed on the phone, so nothing about the cost is a surprise on the doorstep.

Estimate visitNo charge

You already know what you want done

A boiler replaced, a bathroom rebuilt, a gas line run. We come out, look at the job and give you a number.

No obligation
Diagnostic visitQuoted on the call

Something has failed and nobody knows why

A licensed technician and the time to find what has actually gone wrong. One rate across plumbing, heating, cooling and gas, and one number to reach us on — there is no separate line to find at midnight. You get the figure before anyone is dispatched, and after-hours, weekend and holiday work is quoted the same way.

The rate you are told is the rate

You get the number on the phone, before anyone is dispatched, and it is what you are charged when the technician arrives. One rate across all four trades — plumbing, heating, cooling and gas.

What it pays for

A licensed, insured technician carrying the certifications the work needs, and the time to find what has actually failed — not a quick look and a guess.

Watch for the bait and switch

A call-out advertised at almost nothing gets recovered once someone is standing in your basement. Get the number before anyone travels — from us, or from anyone else you call — and hold them to it when they arrive.

Financing on larger jobs

A boiler that fails in January is not a purchase anyone planned. Financing is available on the big-ticket work, so a system replacement does not have to come out of savings in one go.

What it is normally used for

Boiler, furnace and water heater replacement, a full air conditioning system, a whole-house repipe, sewer and water main work, and larger contracting jobs — kitchens, bathrooms, dormers and extensions.

When to bring it up

At the estimate, before anything is scheduled. It is worth asking even if you think you will not need it, because knowing it is there changes what you are willing to consider fixing properly.

What it does not change

The price of the job. The quote is the quote whether you finance it or not — and on a straightforward repair it is usually not worth the paperwork. We will tell you which one you are looking at.

Financing provided throughSynchronyCredit is extended by Synchrony. Subject to credit approval.
Call 631-587-0085Not sure which one you need? Call and describe it — we will tell you before we book anything.
Which Farmingdale

East Farmingdale Is Our Own Town

The three Farmingdales are not just a paperwork curiosity. Which one you are in changes who you are dealing with, and on one side of that line we are the local outfit rather than the one driving in.

East Farmingdale is in the Town of Babylon — the same town as our shop on Magro Drive, a few minutes down Route 110. That is the side where we are working in our own jurisdiction: the building department we deal with every week, the inspectors we already know, and the shortest drive we make into the Farmingdale ZIP. If your address is east of the county line, you are effectively calling a local company rather than one crossing into somebody else's territory.

The Village of Farmingdale and South Farmingdale are Nassau County, in the Town of Oyster Bay, and the Village runs its own building department on top of that. Different departments, different expectations, different filing. It is a genuinely different job from an administrative point of view even when the work in the basement is identical.

Where we lead on the Nassau side is cooling, contracting and service — central air and ductless, kitchens, bathrooms, dormers and extensions, and the repair and maintenance work that keeps a seventy-year-old house running. That is not a hedge, it is where we are strongest and it is the honest answer to what a Farmingdale homeowner most often actually needs.

And across all three, the housing is the same story. Roughly two thirds of 11735 went up between 1940 and 1959, so the supply piping, the waste stacks and the heating plant are all reaching the end of their service lives within a few years of each other. Which of those to deal with first is a conversation worth having before something makes the decision for you.

Quick Rules Of Thumb

  • East Farmingdale — Town of Babylon, our own town, our shortest drive
  • Village of Farmingdale — incorporated, its own building department
  • South Farmingdale — Town of Oyster Bay, Nassau County
  • The address decides which, and it is not obvious from the ZIP code
  • Two thirds of the housing is 1940 to 1959, so it ages together
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What We Do Here

Services In Farmingdale

Repipes & Supply Line Replacement

Galvanised supply from the 1940s and 50s closes up from the inside long before it leaks. If your pressure has been dropping for years rather than suddenly, that is usually why.

Water Heaters & Tankless

Replacement and installation, including high-efficiency tankless. We are Navien NSS certified, which matters when a tankless unit needs more than a reset.

Boilers & Furnaces

Heating plant in a post-war house has usually been replaced once already. We install, service and repair both, and we will tell you plainly when a repair is worth doing.

Central Air & Ductless

Full systems and ductless mini-splits — the usual answer in a Cape where there was never anywhere to run a duct.

Gas Lines & Inspections

TASK 86/87 certified gas work, including pressure testing and code compliance. Oyster Bay requires a permit for heating units and fuel storage tanks as well as for the pipe.

Drains, Sewers & Backwater Valves

The Village is sewered, and Village code requires an approved backwater valve where fixtures sit less than three feet above the main sewer. A basement bathroom in an older village house is exactly that situation.

Kitchens & Bathrooms

Full renovations where the plumbing, gas and mechanical are handled by the same licensed team rather than three subcontractors blaming each other.

24/7 Emergency Service

Round the clock, every day of the year. One number for plumbing, heating, cooling and gas.

Common Questions

Frequently Asked Questions

I am in East Farmingdale. Does that make a difference to you?

It does, and in your favour. East Farmingdale is over the county line in the Town of Babylon, which is our own town — the same one our shop sits in, a few minutes down Route 110. It is the building department we work with every week and the shortest drive we make into the Farmingdale ZIP. The rest of Farmingdale is Nassau County and the Town of Oyster Bay, with the Village running its own department on top. Same houses, different administration.

What do you mostly get called for in Farmingdale?

Cooling and renovation work more than anything, and repairs across the board. These are largely post-war houses that were built without air conditioning and have had it added in layers since, so a lot of what we do is putting that right — central air where the ductwork supports it, ductless mini-splits where it does not, and sorting out airflow that was never balanced properly. Then kitchens, bathrooms and dormers, which on a house this age are always more than one trade.

My house is nearly seventy years old and everything feels borrowed time. Where do I start?

With whatever causes the most damage when it goes, not whatever is oldest. A water heater or a supply line failing means drying out a room; a tired boiler means a bad week you can plan around, and an old one can often be kept going one more season while you sort out the bigger job properly. We will give you that order straight, including the parts that say wait. A house built in the 1950s has a queue, and spending in the wrong sequence is the expensive mistake.

Can you do the whole job, or do I need separate trades?

The whole job. Plumbing, heating, cooling, gas and the building work are all our own licensed team, which matters most on renovations — a Farmingdale bathroom or a dormer is three or four trades at once, and the way those projects normally fall apart is the handover between companies rather than any of the work itself. One schedule, one company accountable.

Do you cover all three Farmingdales?

Yes. We work across the Village, South Farmingdale and East Farmingdale — the difference is administrative rather than a service boundary. Tell us the address when you call and we will tell you which department the job answers to, because it genuinely is not obvious from the ZIP code and it is the sort of thing that costs a fortnight if it is got wrong.

Which building department issues a permit in Farmingdale?

It depends which Farmingdale you are in. Inside the incorporated Village, it is the Village of Farmingdale Building Department on Main Street. In South Farmingdale and the other unincorporated areas, it is the Town of Oyster Bay Building Division. East Farmingdale is across the county line in the Town of Babylon, Suffolk County. Call 631-587-0085 with the address and we will tell you which one applies to your job.

Do I need a water softener in Farmingdale?

Almost certainly not. Both suppliers here draw from the Magothy aquifer, and their own annual reports put total hardness in the low single figures to low tens of milligrams per litre — that is very soft water, well under one grain per gallon. If you have staining, the more likely culprit on the South Farmingdale side is iron; the district there runs several iron removal facilities for exactly that reason. It is worth identifying which problem you actually have before buying equipment for the wrong one.

What is a backwater valve, and does my house need one?

It is a one-way valve on the house drain that stops sewage backing up into the lowest fixtures when the main sewer surcharges. Village of Farmingdale code requires an approved backwater valve where a fixture sits less than three feet above the level of the main sewer — which in practice means most basement bathrooms and laundry hookups in the village. If you have ever had water come up through a basement floor drain, this is the fix.

Is East Farmingdale different from the rest?

Yes, in two ways that matter. It is in Suffolk County and the Town of Babylon rather than Nassau and Oyster Bay, so permitting runs through the Town. And it is not fully sewered — Suffolk County has an active Southwest Sewer District expansion project covering parts of the area, and properties outside it are on individual systems.

How far is Farmingdale from your shop?

Under ten miles, more or less due west along Conklin Street. We are at 31 Magro Drive in North Babylon, which puts most of Farmingdale within about fifteen minutes in normal traffic.

Are estimates free?

If you know what you want done, yes — free and with no obligation. If something has failed and nobody knows why yet, that is a diagnostic call rather than an estimate, and the service call fee applies. We will tell you which one applies before anyone gets in a truck. Call 631-587-0085.

Service Area

Proudly Serving Long Island and Surrounding Areas.

Based in North Babylon, working across both counties — close enough to get there fast, local enough to know the housing stock and the permit offices.

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Towns We Serve

Proudly serving all of Nassau and Suffolk County, with deep local roots near our North Babylon home base.

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What Long Island Says

Reviews From Homes & Businesses We've Served

5 out of 5 stars

The experience I had with with NJM Mechanical & Contracting was a pleasant one. I had the pleasure of doing business with Neil. The work I had done was a basement entrance to my yard and it came out wonderful. The work performed as well as the communication is 10/10.

Nick UrziaJune 2026
Reviewed on Google

5 out of 5 stars

Neil has handled all my A/C needs over the years. He's very communicative and open about service charges. He never steers you wrong

Jim JacksonMay 2026
Reviewed on Google

5 out of 5 stars

As always, Neil is a pleasure to have as my plumber. He is so professional and knowledgeable. I wouldn't use anyone else! I highly, highly recommend him.

Fritzi R.May 2026
Reviewed on Housecall Pro

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