NYC Mold Testing: Cost, Process & Requirements (2026)

By Resi Comply

Mold is a common issue in New York City apartment buildings. Plumbing leaks, roof damage, condensation, and inadequate ventilation create moisture conditions that allow mold to develop on walls, ceilings, window frames, and other building materials.

A professional mold inspection identifies visible mold, investigates moisture sources, and determines the required corrective action.

For NYC landlords and property managers, mold conditions also create compliance obligations under Local Law 55, New York State Labor Law Article 32, and applicable HPD and DEP regulations.

This guide covers mold inspection costs, assessment procedures, landlord responsibilities, and the requirements for correcting HPD mold violations.

How Much Does Mold Testing Cost in NYC?

Resi Comply mold inspections start at $450, including two air samples. Additional air samples cost $75 each.

Inspection pricing depends on the property size, number of affected areas, and sampling requirements.

Multi-unit building assessments, extensive moisture investigations, and post-remediation clearance assessments are priced separately.

Before scheduling a mold inspection, confirm whether laboratory analysis and a written inspection report are included.

What Does a Professional Mold Inspection Include?

Visual Inspection

The inspector examines walls, ceilings, bathrooms, kitchens, window frames, and areas affected by moisture.

Visible mold growth, water staining, damaged plaster, deteriorating paint, and evidence of leaks are documented.

Moisture Investigation

The inspector investigates potential sources of moisture, including plumbing leaks, roof leaks, condensation, and water infiltration.

Moisture meters are used when appropriate to evaluate affected building materials.

Air Sampling

When required by the inspection scope, air samples are collected and submitted to a laboratory.

Laboratory results identify airborne fungal spore types and concentrations.

Air sampling is not required for every mold condition. Visible mold and moisture damage often establish the need for corrective work without laboratory testing.

Inspection Findings

The inspection findings document the conditions observed, sampling results where applicable, and recommended corrective action.

Learn more about our mold inspection and assessment services.

Is Mold Testing Required by Law in NYC?

NYC does not require routine laboratory mold testing in every rental apartment.

However, Local Law 55 requires owners of covered residential buildings to inspect for indoor allergen hazards, including mold, and correct identified conditions.

Owners of buildings with three or more apartments generally must conduct annual inspections for indoor allergen hazards and respond to relevant complaints.

Official HPD guidance: Indoor Allergen Hazards

HPD Mold Violations: Class A, B, and C

HPD classifies mold violations based on the extent and location of visible mold growth.

For mold within an individual apartment room:

Violation	Mold area	Correction deadline
Class A	Less than 10 square feet	90 days
Class B	10 to 29 square feet	30 days
Class C	30 square feet or more	21 days

Separate thresholds apply to hallways and common areas.

The correction and certification deadlines must be confirmed against the actual HPD Notice of Violation.

When Is a Licensed Mold Assessor and Remediator Required?

For residential buildings containing 10 or more dwelling units, original HPD Class B and Class C mold violations require a licensed mold assessor and a separate licensed mold remediation contractor under HPD’s procedures.

The contractors must hold the applicable New York State Department of Labor licenses and remain independent of one another.

Different requirements apply to smaller buildings, Class A violations, and certain violations upgraded from Class A.

For applicable licensed projects, the following procedures must be completed.

Step 1: Pre-Remediation Mold Assessment

A licensed mold assessor must perform a pre-remediation assessment before remediation begins.

The assessment establishes the extent of the mold condition and the scope of work necessary to correct it.

The assessor evaluates:

The location and extent of visible mold growth.
Materials affected by mold or moisture.
Potential sources of water intrusion or condensation.
Required containment and worker protection.
Materials that must be cleaned or removed.
Post-remediation clearance requirements.

The assessor documents the findings and prepares a written Mold Remediation Plan.

Step 2: Written Mold Remediation Plan

The licensed mold assessor must prepare a project-specific Mold Remediation Plan before remediation begins.

The plan defines the remediation requirements and provides the instructions used to establish the scope of work.

The plan includes:

The specific rooms and areas requiring remediation.
The estimated quantities of affected materials.
The cleaning and removal methods.
Required personal protective equipment.
Containment and dust-control procedures.
Clearance procedures and acceptance criteria.
Moisture sources and recommended corrective measures.
The anticipated project duration and cost estimate.

The property owner receives the plan and provides it to the licensed mold remediation contractor.

The remediation contractor cannot replace the independent assessment with its own assessment.

Step 3: Remediation Contractor Work Plan and DEP Filing

After receiving the assessor’s Mold Remediation Plan, the licensed remediation contractor must prepare a separate Mold Remediation Work Plan.

This document explains how the contractor will perform the remediation and satisfy the requirements established by the assessor.

The contractor must provide the work plan to the property owner before work begins.

For covered NYC projects, the remediation contractor must also submit the Mold Remediation Work Plan and Notification to the NYC Department of Environmental Protection.

The DEP notification generally must be submitted at least two business days before remediation begins, subject to applicable emergency provisions.

The work plan and notification cannot be filed retroactively to satisfy a filing requirement that was missed.

Official DEP guidance: Mold Abatement

Step 4: Licensed Mold Remediation

Once the required assessment, plans, and filings are completed, the licensed mold remediation contractor performs the work.

The contractor must follow the assessor’s remediation plan and its own work plan.

Work includes applicable containment, removal of contaminated materials, cleaning, HEPA vacuuming, and measures to prevent the spread of mold contamination.

The underlying moisture source must also be addressed to prevent mold from returning.

Step 5: Post-Remediation Assessment and Clearance

After the remediation work is completed, the independent licensed mold assessor performs a post-remediation assessment.

The assessor determines whether the completed work meets the clearance criteria established in the remediation plan.

If the work passes, the assessor issues the required written clearance documentation.

If it fails, additional corrective work is necessary before the project can be cleared.

The assessor also files the applicable Post-Remediation Assessment Form and Mold Post-Remediation Certification with DEP for covered projects.

Step 6: HPD Mold Violation Documentation and Submission

Completing remediation does not automatically remove the HPD violation.

For applicable original Class B and Class C mold violations in residential buildings with 10 or more units, HPD requires supporting documentation, including:

Affidavit of Mold Assessment.
Affidavit of Mold Remediation.
Licensed mold assessor documentation.
Licensed mold remediator documentation.
DEP remediation work plan filing receipt.
DEP post-remediation assessment filing receipt.
The appropriate HPD correction certification or affidavit.

The required documents must be submitted to HPD through the applicable process.

Missing documentation can prevent removal of the violation even when the physical mold condition has been corrected.

What Does HPD DEFECT Status Mean?

When an HPD mold violation shows DEFECT status, HPD has inspected the property and verified that the physical condition was corrected.

However, the violation remains outstanding because the required supporting documentation has not been submitted or accepted.

In these cases, the owner should identify the missing documents and submit them to HPD.

For qualifying violations, another paid dismissal inspection is not necessary because HPD has already verified the physical correction.

Resi Comply assists building owners and property managers with mold violation reviews, required documentation, DEP filing coordination, and HPD submissions.

Can a Building Superintendent Remove Mold?

Yes, when the work does not trigger licensed mold remediation requirements and the applicable safe work practices are followed.

For buildings with fewer than 10 dwelling units, HPD generally permits owners or their employees to correct mold violations without licensed mold contractors under the applicable procedures.

In buildings with 10 or more units, Class A mold conditions can also generally be corrected by owners or their employees using the required safe work practices.

Original Class B and Class C mold violations in buildings with 10 or more units require the licensed assessment and remediation procedures described above.

The building’s unit count, mold area, and original violation classification must be reviewed before work is assigned.

Frequently Asked Questions

How much does mold testing cost in NYC?

Resi Comply mold inspections start at $450, including two air samples. Additional samples are $75 each.

Is a pre-remediation assessment required for HPD Class B and C mold violations?

Yes. Original Class B and Class C mold violations in buildings with 10 or more dwelling units require the applicable licensed assessment and remediation procedures.

The licensed assessor must inspect the condition and prepare a written Mold Remediation Plan before remediation begins.

Who prepares the mold remediation work plan?

The licensed mold remediation contractor prepares the Mold Remediation Work Plan based on the independent assessor’s Mold Remediation Plan.

Does the mold remediation work plan have to be filed with DEP?

Yes, for projects covered by NYC Local Law 61. The licensed remediation contractor must file the required work plan and notification before beginning remediation.

Is a post-remediation assessment required?

Yes, for regulated licensed remediation projects. The independent licensed assessor must verify that the remediation satisfies the established clearance criteria.

Can the same contractor perform mold assessment and remediation?

No. New York State prohibits the same licensee from performing both licensed mold assessment and mold remediation on the same project.

Does mold remediation automatically close an HPD violation?

No. The owner must satisfy the applicable certification, inspection, and documentation requirements before HPD removes the violation.

Is laboratory mold testing required for every apartment?

No. Routine laboratory air sampling is not required for every mold condition or annual landlord inspection.

Schedule NYC Mold Testing With Resi Comply

Resi Comply provides mold inspections, air sampling, and mold compliance services throughout Manhattan, Brooklyn, Queens, the Bronx, and Staten Island.

We assist property owners and management companies with: