How to Clear an HPD Mold Violation in NYC

If you have received a Notice of Violation (NOV) from the NYC Department of Housing Preservation and Development (HPD) for mold, the clock is already ticking — and it is ticking fast. Under Local Law 55 of 2018, landlords of multiple-dwelling buildings are legally required to maintain tenants' apartments free from mold in all areas under their control. This is not a discretionary obligation. Failure to act within the prescribed window triggers compounding daily fines, potential Emergency Repair Program intervention at your direct expense, and a significant downgrade to your building's BHX Score — which is publicly visible to every prospective tenant and buyer who looks up your address. This guide gives you the complete legal roadmap to correct the violation, communicate properly with your tenant, and certify the correction with HPD before your deadline expires.

Step 1: Identify Your Violation Class — The Clock Is Different for Each

HPD classifies mold violations under the Housing Maintenance Code based on the severity of the hazard. Your Notice of Violation will state the class clearly. The distinction is critical because it determines how much time you have before penalties begin to compound.

Class C violations — the most serious — are those where the mold covers a large area (typically more than 10 square feet), or is located in sleeping rooms, bathrooms, or areas where vulnerable tenants such as children or the elderly reside. If HPD has issued you a Class C mold violation, you must begin remediation immediately. The 21-day deadline is not a planning window — it is a correction deadline. Fines for Class C violations can escalate to $150 per day per violation, and if HPD determines the non-compliance is wilful or repeated, they can refer the case to the Environmental Control Board (ECB) for civil penalties of up to $25,000.

Step 2: Serve the Correct Tenant Notice Before You Enter

Before any contractor sets foot in the affected unit, you have a legal obligation to provide written notice to the tenant under New York Real Property Law §235-b and Local Law 55. This is the step most landlords skip — and it is the step that creates the most legal exposure. Failing to provide proper notice can result in harassment claims, additional HPD violations, and tenant rent-abatement proceedings even if you correct the mold on time.

The required notice must be delivered in writing (in-person delivery or certified mail) at least 24 hours before the first inspection or remediation visit. For emergency conditions under a Class C violation, HPD may allow shorter notice but you must document your attempt. The notice must state:

• The nature of the work to be performed and why it is being done (reference the HPD violation number)
• The date and approximate time window of the planned entry
• The name and license number of the mold assessor and remediator who will be entering
• Tenant preparation instructions — for example, whether furniture needs to be moved away from walls, whether they should vacate during treatment, and whether pets need to be removed
• Contact information where the tenant can reach you or your managing agent with questions

Keep a signed copy of every notice. If a tenant refuses entry, document the refusal in writing and contact HPD immediately. Refusing access to perform a court-ordered or violation-driven repair does not protect the tenant — it creates separate legal exposure for them — but you must follow the correct procedure to protect yourself.

Step 3: Hire Two Separate Licensed Professionals — This is the Law

This is the single most common and costly mistake landlords make when clearing a mold violation. Under NYS Labor Law Article 32, you are prohibited from using the same company to both assess the mold and remediate it. This separation of roles is not a suggestion — it is a statutory requirement designed to prevent conflicts of interest. Any contractor who offers to 'inspect and fix' the mold in one visit is either performing unlicensed work or violating state law. HPD will not accept certification from a remediation company that also performed the assessment.

You need two distinct licensed professionals:

• Licensed Mold Assessor (LMA): Must hold a current New York State Department of Labor Mold Assessor license (verify at labor.ny.gov). The assessor inspects the affected area, identifies the moisture source, determines the scope of mold contamination, and produces a written Mold Remediation Plan that the remediator must follow exactly.
• Licensed Mold Remediator (LMR): Must hold a current New York State Department of Labor Mold Remediator license. They follow the assessor's plan, perform the physical removal and treatment of mold using approved containment and disposal methods, and cannot deviate from the plan without a written amendment from the assessor.
• What will not work: Painting over mold, using bleach sprays and calling it done, or having building maintenance staff perform the work. All of these will result in a failed reinspection, a new violation, and escalating fines.

Step 4: Repair the Underlying Moisture Source — HPD Will Check

Mold is a symptom, not a cause. HPD inspectors are specifically trained to identify whether the moisture source driving the mold growth has been addressed. If you remove the mold but leave a leaking pipe, a failed roof membrane, or inadequate bathroom ventilation unrepaired, your certification will be rejected and the violation will remain open. The moisture source must be documented as repaired in writing, typically through a licensed plumber's or contractor's signed work order.

Common moisture sources that drive HPD mold violations in NYC:

• Leaking supply or drain pipes within walls (requires a licensed Master Plumber to repair and document)
• Failed building envelope — gaps around windows, cracked facade, or deteriorating parapet allowing water infiltration
• Roof leaks in top-floor and penthouse units (requires DOB-permitted roof work for structural repairs)
• Condensation from inadequate ventilation — chronic in bathrooms without operable windows or exhaust fans
• HVAC condensate drain failures — particularly in central air systems serving multiple units

Step 5: What the Clearance Document Must Contain

Once remediation is complete, the mold assessor must return to the property to perform a post-remediation assessment. This is not optional. The assessor inspects the remediated area and — if mold is no longer detectable — issues a Clearance Document (also called a Post-Remediation Assessment Report or Clearance Report). This document is what HPD requires to accept your certification. Without it, your eCertification filing will be rejected.

The clearance document must contain all of the following to be accepted by HPD:

• The licensed mold assessor's full name, NYS license number, and license expiration date
• The address, unit number, and specific rooms inspected
• A statement confirming that the remediation was performed in accordance with the original Mold Remediation Plan
• Confirmation that no visible mold was present at the time of post-remediation inspection
• Results of any air sampling or surface testing performed (required if the original violation covered more than 10 square feet)
• The assessor's original signature and the date of the post-remediation inspection
• Documentation that the underlying moisture source has been repaired (or a reference to the plumber/contractor work order)

Step 6: File the Certification of Correction with HPD

Once you have the clearance document in hand, file your Certification of Correction through HPD's eCertification portal at hpdonline.nyc.gov. You cannot file by paper for mold violations — it must be done online. You will need to submit:

• The HPD violation number (from your NOV)
• The licensed mold assessor's NYS license number
• The licensed mold remediator's NYS license number
• Upload of the post-remediation Clearance Document
• Upload of the signed work order from the plumber or contractor who repaired the moisture source
• An affidavit (which you sign online) confirming that all work was completed in compliance with NYS Labor Law Article 32

HPD typically processes certifications within 5 to 10 business days. During this period, the violation remains listed as open — this is normal. Once processed and accepted, the status will update to 'Certified' in the public record. If HPD rejects the certification (usually due to missing documentation), you will receive a notification and have a short window to refile. Do not wait — a rejection does not extend your correction deadline, and fines continue to accrue.

What Does Mold Remediation Actually Cost in NYC?

Realistic cost ranges for a standard NYC apartment mold remediation job in 2025:

The cost of doing this correctly — assessor, remediator, moisture repair, and clearance document — typically runs between $2,500 and $7,000 for a standard NYC apartment. That is significantly less than the combined cost of daily ECB fines, tenant rent-abatement claims, and potential HPD Emergency Repair Program intervention, where the city performs the work and charges you a premium with an administrative fee on top.