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NJM Mechanical & Contracting

Plumbing, Heating & Cooling In Deer Park

Deer Park mixes residential streets with a large commercial and industrial corridor, which means we are as likely to be on a rooftop unit here as under a kitchen sink. Both are our own licensed crew.

RESIDENTIAL & COMMERCIALROOFTOP UNITS24/7 EMERGENCYLICENSED
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22+ YEARS ON LONG ISLAND

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Deer Park

Residential & Commercial Plumbing, Heating & Cooling In Deer Park

Deer Park is the second largest hamlet in the Town of Babylon — nearly twenty-nine thousand people across six square miles in the north-eastern corner of the town — and it is split in a way most of our service area is not. Residential streets on one side, and a substantial commercial and industrial corridor on the other, from the Industry Court and Jefryn Boulevard warehouse grid to the 737,000 square feet of Tanger Outlets. We work both. On any given week we are as likely to be on a rooftop unit behind a Deer Park warehouse as under a kitchen sink.

That matters if you run a business here, because commercial mechanical work usually means dealing with a company that does only commercial, or a residential outfit stretching past what it is set up for. NJM is licensed and insured for both, with the same crew and the same 24/7 response, and we schedule commercial work around trading hours where the job allows.

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.
Commercial Compliance

The Annual Test That Can Switch Your Water Off

If you own or run a commercial property in Deer Park, this is the compliance item most likely to catch you — and the consequence is not a fine, it is your water.

New York State requires backflow prevention devices to be inspected and tested at the time of initial installation, after each repair, and annually thereafter, by a certified backflow prevention device tester. The Suffolk County Water Authority administers that as your supplier of water, and its own cross-connection control manual is blunt about how it does so: all new commercial buildings require a reduced pressure zone device, retrofit commercial accounts and existing buildings converting from a well require either an RPZ or a double check valve, devices are tested annually at the customer expense with results submitted through the SCWA online portal, and if the test is not performed within the allotted sixty-day window the account is slated for shut off.

The paperwork is specific too. The tester files New York State form DOH-1013, and copies go to the designated health department representative and to the water supplier within thirty days of the test. If a device fails, the tester must notify both the owner and the water supplier immediately. There is no version of this where a failed device quietly waits for next year.

It also cannot be done by just anyone with a wrench. The tester has to hold New York State certification, which runs three years before it needs renewing, and SCWA additionally requires the appropriate Suffolk County licensing for backflow testing. When we take on a commercial building we make sure this is on the calendar and coordinated rather than discovered at a shut-off notice — and where the testing itself needs a separately certified tester, we say so and arrange it instead of quietly letting the date pass.

The second one that catches Deer Park businesses is sequencing. Town of Babylon site plan review applies to commercial, industrial and multiple-residence development, and it is triggered by more than new construction — a building area increase of ten per cent or more will do it, as will changes affecting parking, lighting or fencing, or work within a hundred feet of waterways or wetlands. The Planning Board has sixty-two days to decide, and no building permit, plumbing permit, sign permit or certificate of occupancy may be issued until site plan approval is. If your fit-out schedule assumes the plumbing permit can be pulled while site plan review runs, the schedule is wrong.

Quick Rules Of Thumb

  • Backflow devices: tested at installation, after every repair, and annually
  • RPZ required on all new commercial buildings; RPZ or DCV on retrofits and well conversions
  • Miss the 60-day testing window and SCWA slates the account for shut off
  • Form DOH-1013 to the health department and the water supplier within 30 days
  • Testing needs NYS certification plus the Suffolk County licensing SCWA names
  • Site plan approval comes before the plumbing permit, not alongside it
  • A 10% building area increase is enough to trigger site plan review
Talk It Through — 631-587-0085
What We Do Here

Services In Deer Park

Commercial Plumbing

Offices, warehouses, restaurants and retail along the Deer Park commercial corridor. Installations, repairs and emergency response, with the permit and inspection sequence handled in the right order.

Rooftop Units & Commercial Cooling

Rooftop package units and split systems installed, serviced and repaired, with emergency cover for the days a failure would close you.

Commercial Heating

Heating plant and distribution for Deer Park businesses, serviced on a schedule that suits the operation rather than interrupting it.

Residential Plumbing

The full range for Deer Park homes — leaks, clogs, water heaters, repipes and fixture work, with a licensed Master Plumber on staff.

Home Heating & Cooling

Boilers, furnaces, central air and ductless mini-splits installed and repaired for houses across the hamlet.

Gas Lines & Inspections

TASK 86/87 certified gas work for both residential and commercial premises, including pressure testing and code compliance. In this Town a gas piping permit is only issued to a Town of Babylon licensed master or restricted master plumber.

Renovations & Build-Outs

Kitchens and bathrooms for homes, and commercial build-outs where the plumbing, gas and HVAC are handled by the same licensed team — and where somebody is tracking the site plan approval that gates the plumbing permit.

24/7 Emergency Service

Round the clock, every day. A commercial failure overnight is exactly the call we are set up to take.

Backflow Devices & Cross-Connection Work

Installation and replacement of RPZ and double check valve assemblies, and coordinating the annual certified test and the DOH-1013 filing so the sixty-day window never becomes a shut-off notice. SCWA cross-connection can be reached directly on 631-563-0266.

Grease Interceptors & Food Service

For restaurants and caterers, the interceptor has to appear on the utility site plan and arrive with a letter of certification confirming it was fabricated within the county minimum design requirements. We get that right before the permit is filed rather than after it comes back.

Sewer Connections & Discharge Certifications

Commercial sewer connections run on a Special Permit rather than the general residential permit, and industrial, commercial and institutional users additionally need a Discharge Certification on a five-year term — renewable ninety days before it expires. Whoever makes the connection must be registered with Suffolk County DPW and carry the licence, bond and insurance the code requires.

Common Questions

Frequently Asked Questions

Do you handle commercial properties in Deer Park?

Yes — offices, warehouses, restaurants and retail across the commercial and industrial corridor. Commercial work gets the same licensed crew and the same 24/7 response as our residential work, scheduled around your operating hours where the job allows.

How often does my backflow prevention device have to be tested?

Annually, and also at initial installation and after every repair. That is New York State law, and the Suffolk County Water Authority enforces it as your supplier of water. Results are submitted through the SCWA online portal at your expense. The part people do not know until it happens: SCWA states that if the test is not performed within the allotted sixty-day window, the account is slated for shut off. It is worth having the date in a calendar rather than in a drawer.

Who is allowed to test it?

A tester holding New York State backflow prevention device tester certification, which runs three years before renewal is required. SCWA additionally requires the appropriate Suffolk County licensing for backflow testing, and submitters to its portal have to be registered with SCWA first. The tester files New York State form DOH-1013, with copies to the designated health department representative and to the water supplier within thirty days — and if the device fails, the owner and the water supplier have to be told immediately.

Does my building need a backflow device at all?

If it is a new commercial building, SCWA requires a reduced pressure zone device. If it is an existing commercial building being retrofitted, or a property converting from a private well onto public water, SCWA requires either an RPZ or a double check valve. Fire line services have their own requirement based on the AWWA M-14 guidelines. There are residential cases too, where the hazard is high — fire systems, chemicals in an irrigation system, open-loop geothermal. If you are not sure which applies, SCWA cross-connection control is on 631-563-0266, or call us on 631-587-0085 and we will look at it with you.

I am doing a commercial fit-out. What order do the permits go in?

Site plan approval first. Town of Babylon site plan review covers commercial, industrial and multiple-residence development, and no building permit, plumbing permit, sign permit or certificate of occupancy may be issued until site plan approval or approval of a site plan modification has been issued. The Planning Board has sixty-two days to decide. Note the triggers are broader than new construction — a ten per cent or greater increase in building area counts, so do changes to parking, lighting or fencing, and so does work within a hundred feet of waterways or wetlands. Schedules that assume the plumbing permit can run in parallel are the ones that slip.

What do I need for a restaurant grease interceptor?

For a commercial connection to a county sewer district, the interceptor has to be shown on a detailed utility site plan along with the rest of the existing plumbing and underground utilities, and it must be delivered with a letter of certification confirming it was fabricated within the minimum design requirements set by Suffolk County Department of Public Works. Food service applications also have to state the establishment type and seating capacity. We would rather get that into the application than have it come back.

Is my commercial property on the sewer?

Do not assume it is. Suffolk County names Deer Park as one of the communities studied for extension of Sewer District No. 3, and in 2024 committed funding toward expanding the Southwest district into Deer Park and neighbouring hamlets — which tells you plainly that parts of it are not connected yet. It changes the job substantially: a sewered commercial property runs on a county Special Permit plus a Discharge Certification, and an unsewered one is an on-site system review instead. Establish which you are before design, not during.

What is a Discharge Certification and do I need one?

It is the county instrument that identifies, regulates and monitors what industrial, commercial and institutional users put into the sewer system — toxic, hazardous, objectionable and excess-strength discharges. All industrial, commercial and institutional users connected to a county district need one. They run on five-year terms and are renewed ninety days before expiry. Commercial connections themselves run on a Special Permit rather than the general permit a private dwelling uses.

Can you service rooftop units?

Yes. Rooftop package units and commercial split systems, installed, maintained and repaired. If a unit fails overnight and it would close you in the morning, that is the call we are set up to take.

Do you offer maintenance agreements for businesses?

Call 631-587-0085 and we will talk through what your equipment and operating hours actually need. Preventive service on commercial cooling in particular tends to cost far less than the emergency call it avoids in July — and a maintenance visit is the natural place to keep the backflow test date from creeping up on you.

Who issues permits in Deer Park?

Deer Park is a hamlet within the Town of Babylon, so permits go through the Town rather than a village building department. We handle the application and inspections as part of the job. Worth knowing: plumbing and gas permits in this Town are only issued to master or restricted master plumbers licensed by the Town of Babylon own Plumbers Examining Board — a Suffolk County licence does not substitute, because the county article does not apply in a town that licenses its own.

How far is Deer Park from your shop?

A few minutes. We are at 31 Magro Drive in North Babylon, the neighbouring hamlet in the same town.

Are estimates free?

Yes, free and with no obligation, for residential and commercial work alike. Call 631-587-0085, or use the form on this page and we will be in touch within 24 hours.

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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  • Long Island
  • Nassau County
  • Suffolk County

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

Read all 87 reviews from Google and Housecall Pro →

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