N.Y.C. Admin. Code tit. 27, ch. 2 § 27-2017.9
Work practices (New York City Housing Maintenance Code)
Operative Text
a. The department shall promulgate rules, with the approval of the department of health and mental hygiene, establishing work practices when assessing and correcting indoor mold hazards, and underlying defects including violations cited by the department pursuant to this article. The department shall from time-to-time review and revise such rules based upon, among other things, the latest scientific data and developing federal, state, and local laws and industry standards. b. The work practices promulgated pursuant to subdivision a of this section shall include the requirement that when correcting an indoor mold hazard violation issued pursuant to this article, or when assessing and correcting an indoor mold hazard identified as a result of an inspection by an owner, such owner shall comply with the following work practices: 1. investigate and correct any underlying defect, including moisture or leak conditions, that are causing or may cause mold violations; 2. remove or securely cover with plastic sheeting any furniture or other items in the work area that cannot be removed; 3. minimize the dispersion of dust and debris from the work area to other parts of the dwelling unit through methods such as: sealing ventilation ducts/grills and other openings in the work area with plastic sheeting; isolating the work area with plastic sheeting and covering egress pathways; cleaning or gently misting surfaces with a dilute soap or detergent solution prior to removal; the use of HEPA vacuum-shrouded tools or a vacuum equipped with a HEPA filter at the point of dust generation; 4. clean mold with soap or detergent and water; 5. remove and discard materials that cannot be cleaned properly; 6. properly remove and discard plastic sheeting, cleaning implements, and contaminated materials in sealed, heavy weight plastic bags; 7. clean any remaining visible dust from the work area using wet cleaning methods or HEPA vacuuming; and 8. leave the work area dry and visibly free from mold, dust, and debris. The work practices shall also include a requirement that when correcting an indoor mold hazard violation issued pursuant to this article, or when assessing or correcting an indoor mold hazard identified as a result of an inspection by an owner, such assessments or work shall be performed in compliance with article 32 of New York state labor law and any rules promulgated thereunder, where applicable. c. An owner's certification of correction of an indoor mold hazard violation issued pursuant to this article shall include an affidavit affirming that the work practices required pursuant to this section were properly performed. The department may also by rule require additional documentation for certification of correction of an indoor mold hazard violation. (L.L. 2018/055, 1/19/2018, eff. 1/19/2019)
Section 27-2017.9 of the N.Y.C. Administrative Code establishes a framework of required work practices that must be followed whenever indoor mold hazards are assessed or corrected in residential buildings. These practices—developed by the Department of Housing Preservation and Development with approval from the Department of Health and Mental Hygiene—cover a step-by-step process including fixing underlying moisture problems, containing the work area, cleaning with appropriate methods, and leaving the space dry and visibly free of mold. The rules are subject to periodic revision based on new scientific data and evolving federal, state, and local standards. When a mold violation is corrected, the owner must submit a certified affidavit confirming that all required work practices were properly followed.
Plain English — not legal advice.
Under N.Y.C. Admin. Code § 27-2017.9, property owners and managers who address indoor mold hazards—whether in response to a cited violation or as a result of their own inspection—are generally expected to follow a specific sequence of work practices set by the Department of Housing Preservation and Development. Compliant operators typically investigate and repair underlying moisture or leak conditions first, then contain the work area with plastic sheeting, use HEPA-filtered equipment to minimize dust dispersion, clean mold with soap and water, and properly bag and discard contaminated materials. Work must also comply with Article 32 of New York State Labor Law where applicable, and upon completion, owners must file an affidavit certifying that all required practices under this section were properly performed.
General guidance for property managers — not legal advice for your specific situation. Consult an attorney for advice on your case.
N.Y.C. Admin. Code § 27-2017.9 gives tenants a basis to expect that any mold remediation work performed in their home—whether triggered by a violation or an owner's own inspection—follows a defined set of protective work practices, including containment of the work area, proper cleaning methods, and leaving the space dry and visibly mold-free. If remediation work appears to have been done improperly or a mold condition persists, tenants may consider filing a complaint with the New York City Department of Housing Preservation and Development or raising the owner's failure to comply with these work practices in a housing court proceeding. Tenant-rights organizations familiar with New York City housing law can help explain the range of options available under this provision.
General guidance for tenants — not legal advice for your specific situation. Consult a tenant-rights organization or attorney for advice on your case.
Generated October 14, 2026 — auto-generated, not yet human-reviewed. See /transparency for methodology.
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