the Bronx and the lower Westchester towns along its northern edge
Mold Violations and Owner Duties in the Bronx and Lower Westchester
Work out exactly what a dated mold violation, or a tenant complaint you have not answered yet, requires you to do, in what order, and who is allowed to do it.
Violation Response quote
Tell us the address, how many apartments are in the building, and the class and date on the violation if you have it in front of you. Those three things decide the whole sequence.
Would you rather talk it through? Call (315) 640-3590, answered 24/7.
$100 off your first job
Credited by us on your first booked job.
- One credit per customer per property, on your first booked job.
- Valid through December 31, 2026.
Mention this offer when you book. Full terms.
What correcting a mold violation actually takes
This is the version of the job where somebody else set the deadline. New York City grades a mold violation in a dwelling unit by the area in one room: under ten square feet is class A with 90 days to correct, ten to twenty nine square feet is class B with 30 days, and thirty square feet or more is class C, immediately hazardous, with 21 days. Correcting it is not one invoice. It takes an independent licensed assessor, a separately licensed remediation contractor, an affidavit from each of them, and in a building of ten or more units, two filings with DEP. We work out which of those layers your address sits under and line the parties up in the order the law wants them. Nothing about this is unusual here: city inspectors recorded 20,424 mold violations in the Bronx in 2024, out of 46,780 across the five boroughs.
- Reading the violation and working out its class, its correction date and what correcting it means
- Introducing an independent licensed mold assessor to write the remediation plan
- Introducing a separately licensed remediation contractor to carry that plan out
- The DEP work plan notification a covered building needs before the work can start
- The post remediation assessment the assessor files after the work
- The two affidavits and the filing proof a certification of correction has to carry
- Local Law 55 duties between violations: the annual unit inspection, the complaint response and the tenant notice
- Turnover work, since a vacant unit inside the city has to be clean and free from mold before a new tenant moves in
- The same sequence across the city line, where state law applies and the city layers do not
What decides how hard a violation is to clear
Two answers set almost everything: how many apartments are in the building, and which side of the city line the address is on. Everything below follows from those two.
How many dwelling units the building has
Three or more inside the city brings Local Law 55, which requires an annual inspection of every unit for indoor allergen hazards including mold, a response to tenant and city complaints, and a notice with the lease. Ten or more adds Administrative Code 24-154 and the DEP filings.
Which side of the city line the address is on
In a Bronx building of ten or more units the owner, the managing agent and their employees are barred from doing mold work over ten square feet at all. In Yonkers, Mount Vernon, New Rochelle and Pelham there is no equivalent local law, the state exemption in section 933 stands, and the same staff may lawfully do that work.
The class on the notice
Class A gives 90 days, class B gives 30 and class C gives 21. The area measured in a single room sets the class, and in a hallway or common area the class B line starts at thirty square feet instead.
Whether the building has been cited before
Open uncorrected class B or C mold or leak violations can pull a building into HPD's Underlying Conditions Program, which can order a registered architect or professional engineer report on whether the roof or the facade is the source of the water, and a fix within four months. In the 2025 round, 57 of the 104 buildings selected citywide were in the Bronx.
Whether a tenant has an asthma diagnosis
A tenant diagnosed with moderate or severe persistent asthma brings an owner of a building of any size inside the same duty to keep the home clear of mold and to repair the water problem underneath it.
Whether the water has a building cause
Repeat mold is treated as a building defect rather than a housekeeping failure. The city rule names defective masonry pointing and water infiltration from plumbing, and the assessor's plan is supposed to identify the source where it can be found.
What the penalty exposure looks like
DEP states that penalties ranging from $800 to $10,000 may apply where an owner fails to hire the appropriate licensed mold assessors, or where the assessment licensee does not file the post remediation assessment form and record. A cheap crew can cost several times the saving.
Working to a date somebody else set
Send the class and the correction deadline. We will tell you which licensees your address needs and what has to be filed before work can begin.
The order the law wants, from notice to certification
Read the notice and date the clock
Class, unit, room, cited area and correction date. That one line decides how much time exists and what correcting it will mean in practice.
Establish which layers apply to the address
Article 32 across the state, Local Law 55 at three units inside the city, Administrative Code 24-154 at ten. Across the city line only the state layer applies and the local building department enforces the rest, which is a genuinely different job.
Bring in the independent assessor first
The assessment licensee writes the project specific plan: rooms, methods, quantities, clearance criteria, protective equipment, occupant notification, an estimate of cost and time, and the moisture source where it can be identified.
File before starting, where the building is covered
The remediator files the work plan with the administering agency no later than two business days before the work begins. That shortens to within a day of starting where the condition poses an immediate risk of harm, or the work is under a short court order.
Do the work, defect first
The city work practices put correcting the underlying defect ahead of the cleaning, then require containment, sealed ducts, misting or HEPA shrouded tools, bagged waste, HEPA vacuuming or wet cleaning, and a dry finish.
Clear it independently
The assessment licensee verifies that the area is free from visible mold and issues the written clearance report, then files the post remediation assessment within seven days where the building is covered.
Certify the correction with the paperwork attached
The certification has to carry an affidavit from the remediator, an affidavit from the assessor, and proof that both documents reached DEP. A single all inclusive invoice from one company cannot produce that set.
Violation Response work we have arranged
What violation response looks like
Where violation response starts and stops
When you may not need this at all
- If you are the tenant rather than the owner, none of this is yours to arrange or pay for. Mold in a Bronx building of three or more apartments is the owner's statutory duty, and the route is 311, which routes it to HPD.
- Under ten square feet in a room is a class A violation with 90 days, and it is not a licensed mold project under state law. Many owners correct and certify that themselves.
- Visible mold on tile or grout does not constitute an indoor mold hazard violation under the city rule.
- Outside the city line, in Yonkers, Mount Vernon, New Rochelle or Pelham, there is no HPD violation, no Local Law 55 and no DEP filing. Your own building department and the state warranty of habitability set the standard, and your own staff may lawfully do the work.
- If you own and live in a one or two family house, this is not your route. Start with an assessment instead.
What is out of scope
- Legal representation, housing court work, and advice on a lease or a proprietary lease.
- Filing documents with HPD or DEP on your behalf. The licensees file their own, and the certification of correction is the owner's to make.
- Performing the assessment or the remediation. Both are separately licensed and one company may not do both on the same property.
- Rent regulation questions, tenant relations, and negotiating with a tenant, a shareholder or a board.
- Structural repair to a roof, facade or pointing that an Underlying Conditions order might require.
- Asbestos and lead paint, which pre-1940 stock reliably brings and which carry their own licensing.
Questions owners, agents and boards ask
Can my own maintenance staff correct this?
In a Bronx building of ten or more dwelling units, no. Administrative Code 24-154 bars the owner, the managing agent and their employees from performing mold assessment, abatement or remediation over ten square feet, and requires an Article 32 licensee instead. In Yonkers, Mount Vernon, New Rochelle and Pelham there is no equivalent local law, so the state exemption stands and the same staff may lawfully do it.
What does the city want to see before it accepts the correction?
Where licensed workers were required, the owner's certification of correction has to include an affidavit from the remediator, an affidavit from the assessor, and proof that the remediation plan and the assessor's final report were submitted to DEP.
What happens if the correction date passes?
The class escalates. HPD upgrades a class A to class B and a class B to class C where the owner does not correct it or states falsely that it was corrected, and it attempts to reinspect every class B and class C mold violation either way.
Does one violation put my building into a program?
One usually does not. A pattern can. Buildings left with open uncorrected class B or C mold or leak violations may be pulled into the Underlying Conditions Program, which can order an architect or engineer report on the building condition causing the water and a fix within four months. Of the 104 buildings selected citywide in the 2025 round, 57 were in the Bronx.
I am on a co-op board, not a landlord. Does this apply to us?
The unit count rules read on the building, not on the form of ownership, so a co-op or condo of ten or more units inside the city sits under the same filing regime and the same bar on using in house staff. Who pays for what is a question for the proprietary lease or the bylaws, and that part is not ours to answer.
How do I check the licenses of the people I hire?
The state register is public and searchable. On 16 September 2026 it showed 36 active mold remediation licenses and 28 active mold assessment licenses at Bronx addresses, out of 937 and 802 statewide. Ask for the number and look it up before anyone is booked.
Send us the violation and the unit count
We will map the sequence your building is actually under, on either side of the city line, with no obligation.