24/7 EMERGENCY SERVICE  ·  NASSAU & SUFFOLK COUNTY  ·  631-587-0085
Contracting

Licensed Mold Remediation On Long Island

New York State licensed mold remediation contractor. The law says the company that assesses your property cannot be the company that remediates it — so we do the cleanup and the moisture repair, and the assessment comes from somebody independent.

NYS LICENSEDINDEPENDENT ASSESSMENT REQUIREDWE FIX THE MOISTURENASSAU & SUFFOLK
Licensed & Insured
Master Plumber
TASK 86/87 Certified
Navien NSS Certified
22+ YEARS ON LONG ISLAND

Get Your Free Estimate

LICENSED & INSURED · NASSAU & SUFFOLK
PLUMBING · HEATING · COOLING · CONTRACTING

Have An Emergency? We’re Available 24/7.

631-587-0085WE ANSWER EVERY CALL
STEP 1 OF 4 — WHAT DO YOU NEED?
Home or business?
100% FREE & NO OBLIGATIONRESPONSE WITHIN 24 HOURSFINANCING AVAILABLE
Mold Remediation

Licensed Mold Remediation On Long Island

NJM holds a New York State mold remediation contractor licence, issued by the Department of Labor under Article 32 of the Labor Law. Since 1 January 2016 it has been unlawful in New York for anyone to perform mold remediation on a project — or to advertise as a mold remediation contractor — without one.

Here is the part most companies do not lead with. New York law says we are not allowed to inspect your property for mold and then remediate it. § 936 of the Labor Law is unambiguous: no licensee shall perform both mold assessment and mold remediation on the same property, and no person may own an interest in both the assessing company and the remediating company. There is no exception for small jobs, no emergency exception and no waiver you can sign. If a contractor offers to test your house and then clean it up, that is not a convenient one-stop service. It is against the law, and the reason the law exists is obvious once you see it — the company deciding how much work you need should not be the company selling it to you.

So the honest description of what we do is narrower than a lot of what you will read, and more useful. You hire an independent licensed mold assessor. They inspect, write a remediation plan and set the criteria the job has to meet. We do the remediation work to that plan. They come back and decide whether it passed. And because Article 32 specifically excludes fixing the underlying moisture from the definition of mold remediation, we can also do the thing that actually stops it coming back — the leak, the ventilation, the drainage, the envelope. That part is plumbing, heating, cooling and contracting, which is what we have been doing here since 2004.

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

Contracting — 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.
Where It Comes From

The Moisture Sources — And Who Actually Fixes Them

The New York State Department of Health publishes a list of what causes indoor mold. Read it as a job list rather than a health leaflet and something becomes obvious: almost every item on it is plumbing, heating, cooling, ventilation or building work.

PROBLEM 01

Indoor plumbing leaks

The one people find last, because a supply or waste leak inside a wall or under a floor feeds a cavity for months before anything shows. Locating it properly is the job — we find the leak before anything is opened up, then repair it.

PROBLEM 02

Roof leaks and outdoor drainage

Water arriving from outside — the roof, the grading, the gutters running back against the house. Our contracting side handles envelope and drainage work, which is what makes a repair permanent rather than seasonal.

PROBLEM 03

Damp basements and crawl spaces

Long Island’s water table rises with heavy rain, and a basement that gets damp every spring is a moisture source running on a schedule. Drainage, sealing and dehumidification are the answers, in that order.

PROBLEM 04

Bathroom and kitchen steam with nowhere to go

New York’s Residential Code requires bathroom and kitchen exhaust fans to vent to the exterior of the building. A fan that discharges into an attic or a soffit is not ventilation — it is moving your shower into the roof. We find this constantly, and it is one of the cheapest things on this page to fix.

PROBLEM 05

Clothes dryers venting indoors

On the Health Department’s list by name. A dryer venting into a basement or a disconnected duct behind the machine puts a remarkable volume of warm, wet air into the house every single load.

PROBLEM 06

Condensation on cool surfaces, and poorly ventilated appliances

Cold pipe, uninsulated duct and cold-wall condensation all wet a surface without a leak existing anywhere. So does poor ventilation of heating and cooking appliances. Both are mechanical problems, and both are ours.

Before You Spend Anything

A Lot Of Mold Does Not Need A Contractor At All

This is the section that costs us work, and it is on the page because the alternative is asking you to trust a company that only tells you the parts that generate an invoice.

If the patch is smaller than about three feet by three feet, you can probably deal with it yourself. That is the EPA’s own guidance: if the moldy area is less than about ten square feet, in most cases you can handle the job yourself. New York agrees from the other direction — the Labor Law only defines a "project" as work on areas *greater* than ten square feet, so at or below that, no licence is required and no licensed contractor is needed. The state Health Department gives the same figure. Scrub it off hard surfaces with detergent and water and dry it completely.

Two things change that answer. If you or someone in the house is sensitive to mold, both the Department of Labor and the state Health Department suggest getting a professional in regardless of size. And porous material that has stayed wet — soaked drywall, carpet, insulation, ceiling tile — generally has to come out rather than be cleaned, whatever its area.

You probably do not need testing either. The EPA’s position is that in most cases, if visible mold growth is present, sampling is unnecessary. New York’s Health Department goes further and says plainly that mold testing is not recommended, nor is it required by any regulatory agency, because there is no state or federal standard for mold in homes. CDC’s NIOSH does not recommend routine air sampling and says visual inspection and musty odour are more reliable. If someone is selling you a lab panel to prove you have a problem you can already see, ask what decision the result is going to change.

Be careful that this does not read as "skip the assessor". They are different things. On a job over ten square feet New York requires an independent licensed assessment before remediation can lawfully begin — that is an inspection and a written plan, and it is not optional. What is not required is lab testing. An assessor can write you a plan without sending anything to a laboratory.

And whatever the size, the mold is the symptom. The EPA’s whole guide comes down to one line: the key to mold control is moisture control. Clean it up without fixing the water problem and it comes back. New York builds that into the law — under § 947 the assessor’s post-remediation check has to determine, as far as is feasible, that the underlying cause has been dealt with so it is reasonably certain the mold will not return. A remediation that leaves the leak running can fail its own clearance. So even where you clean the patch yourself, the question worth paying somebody for is where the water is coming from.

Quick Rules Of Thumb

  • Under about 10 sq ft — EPA says most people can handle it themselves
  • New York requires no licence at or below ten square feet
  • Sensitivity, or soaked porous material, changes that answer
  • Testing is usually unnecessary — NY’s Health Department does not recommend it
  • An assessment is not testing, and over 10 sq ft it is legally required
  • Cleaning without fixing the water means doing it again
Talk It Through — 631-587-0085
How It Works

What The Process Actually Looks Like

1. You hire an independent assessor

Not us — the law requires them to be a separate company with no shared ownership. They inspect and write a mold remediation plan naming the areas, the methods, the protective equipment and the criteria the job must meet to pass.

2. The plan names your moisture contractor

Under § 945 the assessor’s plan has to identify, where possible, the underlying moisture source and recommend the type of contractor who would fix it. That is a plumbing, HVAC or building contractor — and having those four trades in one licensed company is exactly why we are worth calling at that point.

3. We write the remediation work plan

Article 32 requires the remediation contractor to produce its own written work plan that fulfils the assessor’s plan, and to give it to you before site preparation begins. A copy stays on the job site.

4. Containment and signage

Where the assessor’s plan calls for containment, we build it so it prevents spread outside the contained area. Signs advising that a remediation project is in progress go at every accessible entrance — that one is required on every job, not just large ones.

5. We fix the water

The part that decides whether any of this was worth doing. Leak repair, re-piping, ventilation, drainage, envelope work — outside the Article 32 scope, and squarely inside ours.

6. The assessor decides whether it passed

They return for a post-remediation assessment, check the area is free from visible mold and that the work met the plan, and issue a written clearance report. Nothing that formed containment comes down before we have that notice. If it failed, they say why, in writing, to both of us.

What we will not do

Fog or spray an antimicrobial because it sounds thorough. § 946 permits disinfectants and biocides only where the assessor’s plan specifies them, EPA-registered and used to the label. The EPA does not recommend biocides as routine practice, and notes that killing mold is not enough because dead mold still causes reactions in some people. It has to be removed.

Where we work

Nassau and Suffolk County, from our base in North Babylon. The state mold licence is a New York State licence, so unlike our plumbing licences it is not town by town.

More Contracting Services

Everything We Handle In Contracting

One licensed team, one number to call, across Nassau and Suffolk County.

Dormer Design & Building by NJM Mechanical & Contracting on Long IslandCONTRACTING

Dormer Design & Building

Custom dormer design & construction for Long Island homes. Licensed, insured & permit-handled across Nassau & Suffolk County. 22+ years experience.

  • CUSTOM DESIGN
  • PERMITS HANDLED
  • PLUMBING IN-HOUSE
  • LICENSED & INSURED
Dormer Design & Building
Home Extensions & Additions by NJM Mechanical & Contracting on Long IslandCONTRACTING

Home Extensions & Additions

Home extensions & additions across Nassau & Suffolk County. Licensed Long Island contractor — design, build, plumbing & HVAC under one roof.

  • DESIGN & BUILD
  • PLUMBING IN-HOUSE
  • HVAC IN-HOUSE
  • PERMITS HANDLED
Home Extensions & Additions
Installer securing a new window unit into a prepared openingCONTRACTING

Window Installation Services

Energy-efficient window installation for Long Island homes. Licensed contractor across Nassau & Suffolk County. Free estimates, professional install.

  • ENERGY EFFICIENT
  • REPLACEMENT
  • NEW CONSTRUCTION
  • FREE ESTIMATES
Window Installation
Interior & Exterior Door Services by NJM Mechanical & Contracting on Long IslandCONTRACTING

Interior & Exterior Door Services

Interior & exterior door installation & replacement for Long Island homes. Licensed contracting across Nassau & Suffolk County. Free estimates.

  • ENTRY DOORS
  • PATIO DOORS
  • INTERIOR DOORS
  • FREE ESTIMATES
Interior & Exterior Doors
Kitchen Renovations by NJM Mechanical & Contracting on Long IslandCONTRACTING

Kitchen Renovations

Full-service kitchen renovations on Long Island. Plumbing, gas & contracting under one roof — no subcontractors. Licensed across Nassau & Suffolk County.

  • FULL RENOVATIONS
  • PLUMBING IN-HOUSE
  • TASK 86/87 GAS
  • LICENSED & INSURED
Kitchen Renovations
Bathroom Renovations by NJM Mechanical & Contracting on Long IslandCONTRACTING

Bathroom Renovations

Bathroom renovations run by Long Island's licensed Master Plumbers — demo, plumbing, waterproofing, tile and finish by one team across Nassau & Suffolk.

  • FULL REMODELS
  • MASTER PLUMBER
  • TILE & FINISH
  • LICENSED & INSURED
Bathroom Renovations
Common Questions

Frequently Asked Questions

Can you come and test my house for mold?

No, and no company that also does the cleanup can. New York Labor Law § 936 says no licensee shall perform both mold assessment and mold remediation on the same property, and separately that nobody may own an interest in both companies. We hold the remediation licence, so the assessment has to come from an independent licensed assessor. That is not us being unhelpful — it is the single best consumer protection in the whole statute, because it means the person telling you how big your problem is has nothing to gain from the answer. The Department of Labor publishes a search tool for licensed mold contractors so you can check any company, including ours.

Is a bit of mold in my bathroom something to worry about?

Usually it is a cleaning and ventilation question rather than a contractor question. The EPA says a patch under about ten square feet — roughly three feet by three feet — can in most cases be handled yourself, with detergent and water, dried completely. New York does not require a licensed contractor at or below that size either. What is worth taking seriously is why it keeps coming back: in a bathroom that is almost always an extractor fan that is missing, undersized, or discharging into the attic instead of outside, which the Residential Code does not allow. Fixing the fan is a small job that stops the problem repeating.

What are the actual health effects?

We will quote the agencies rather than characterise it ourselves, because this is a subject with a lot of marketing attached to it. The CDC says exposure to damp and mouldy environments may cause a variety of health effects, or none at all — for some people a stuffy nose, sore throat, coughing or wheezing, burning eyes or a skin rash. People with asthma or an allergy to mold may have severe reactions, and immune-compromised people and people with chronic lung disease may get lung infections. The EPA notes that symptoms other than the allergic and irritant types are not commonly reported from inhaling mold. If you have symptoms you are worried about, that is a conversation with a doctor, not with a contractor.

Can you guarantee my house will be mold-free afterwards?

No, and anyone who does is telling you something the EPA has directly contradicted — it is impossible to eliminate all mold and mold spores in the indoor environment. Spores are in outdoor air and they come inside every time a door opens. What remediation achieves is removing the growth and the materials it has colonised, verified by an independent assessor against a written plan. What keeps it from returning is dry building materials and humidity kept down, which is why we would rather talk about your leak and your ventilation than sell you a guarantee that nobody can honour.

The mold came back after a company cleaned it. Why?

Almost always because the water was never fixed. The EPA puts it in one line: the key to mold control is moisture control — clean up the mold but not the water problem and most likely it comes back. New York actually writes this into the clearance test: § 947 requires the assessor’s post-remediation check to determine, as far as feasible, that the underlying cause has been remediated so it is reasonably certain the mold will not return. If your last job passed without anyone identifying a moisture source, that is worth asking about. And if the answer is a leak, a fan or a drainage problem, that is the work we would rather be doing.

Do you do the plumbing and building repairs as well, or is that someone else?

That part is ours, and it is the reason this page exists. Article 32 expressly excludes remediation of the underlying sources of moisture from the definition of mold remediation, and the Department of Labor confirms that a remediation contractor may perform those repairs — the assessor’s plan is even required to recommend the type of contractor who should. In most cases that means a plumber, an HVAC contractor or a builder, which for a lot of homeowners means three companies and three schedules. We hold all of those trades, so the leak repair, the ventilation, the drainage and the making-good happen with one company and one point of accountability. The assessment is the one piece we are not allowed to touch.

I found mold while you were doing another job. Does that change everything?

Not automatically. New York’s definition of a mold project excludes construction, maintenance, repair or demolition undertaken for purposes other than mold remediation — so a plumber opening a wall to fix a leak and finding mold behind it has not started a mold project. What we will do is tell you what we found and what we think it means, honestly, including when we think it is small enough for you to handle yourself. If it is larger, or if the material is porous and has been wet, we will explain that an independent assessment comes first and help you understand what you are looking for.

How do I check that a mold contractor is really licensed?

The New York State Department of Labor publishes a Licensed Mold Contractors search tool, and you should use it — on us as well as on anyone else. Article 32 also requires a copy of a valid licence to be displayed conspicuously at the work site on a mold project, so you are entitled to see it on the job, not just be told about it. Licences run for two years and renewal requires a refresher course, so "licensed" is a thing with a date on it. Ask.

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.

Find Contracting Services Near You!

  • 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.

Get A Free Estimate
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

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 forward to working with the team again.

KrisApril 2025
Reviewed on Google

5 out of 5 stars

Bathroom remodel was completed to my complete satisfaction. Family & Friends enjoy experiencing their spa like bathroom grooming. Contractor was personable, professional, friendly, patient and knowledgeable.

Shirley KendallOctober 2024
Reviewed on Google

Read all 87 reviews from Google and Housecall Pro →

Need Mold Remediation?

Free estimates with no obligation, 24/7 emergency response, and 22+ years serving homes and businesses across Nassau and Suffolk County.

CALL NOWGET A FREE ESTIMATE