HPD Mold Compliance
under Local Law 55
If you own or manage residential property in NYC, mold complaints aren't optional to ignore anymore. Local Law 55 set hard rules in 2018 about who can assess, who can remediate, and what paperwork has to exist when HPD comes knocking. Here's how it actually works, and where our lab fits in.
What Local Law 55 actually requires
NYC Local Law 55 of 2018 added Article 32 to the Housing Maintenance Code. The headline rule: any mold-related work in a residential building has to be done by NYS-licensed professionals, with two separate roles. The licensed mold assessor writes the assessment and the post-remediation report. The licensed mold remediator does the actual removal. The same firm can't legally do both on the same job.
For property owners, that means three pieces of paper for every meaningful mold case: an assessment with a remediation plan, a post-remediation clearance report, and the lab analysis that supports both. We handle the lab side under our AIHA EMLAP accreditation; you (or your contractor) hire the licensed assessor and remediator.
Roles, triggers, and timelines
The most common reason building owners get tripped up is the role separation. The second most common is the timeline.
Who can do what
Mold Assessor (NYS DOL-licensed): Inspects, writes the assessment report, develops the remediation plan, and signs off on the post-remediation verification.
Mold Remediator (NYS DOL-licensed): Executes the remediation plan. Cannot also serve as the assessor on the same project.
Mold Abatement Worker: Performs the hands-on remediation under a remediator's supervision.
When HPD gets involved
Tenant complaint: Most cases start here. HPD responds to 311 complaints with a Class C inspection.
Class C violation: Issued for mold conditions affecting an underage occupant or anyone with documented respiratory illness. Owner has 21 days to certify correction.
Failure to certify: HPD can pursue Civil Court action and emergency repair work charged back to the owner.
Threshold for licensing
Licensing is required for residential mold work covering more than 10 square feet of visible mold growth.
Below 10 square feet: technically owner-managed, but most managers still go through a licensed remediator for documentation.
Commercial properties have separate requirements but most owners apply the same standard for consistency.
What the lab work has to support
Pre-remediation: Optional but recommended. Air spore traps, surface tape lifts, or bulk samples document the baseline.
Post-remediation: Required. Visual inspection plus, in most cases, air sampling to confirm levels are at or below outdoor controls.
Reports: Must be formatted to AIHA EMLAP standards and signed by a qualified analyst.
The analytical side, every step
We don't compete with mold assessors or remediators (state law would prevent it anyway). We're the lab that supports both.
For mold assessors
Spore trap and tape lift analysis with HPD-aligned report formatting. Indoor-vs-outdoor comparisons calibrated against the same-day outdoor control.
For remediators
Post-remediation verification analysis. Independent third-party reports that close out the job without the assessor having to argue with HPD.
For property managers
Portfolio-level air quality programs. Recurring spore trap baseline data so when a complaint comes in, you already have history.
Same-week TAT
Standard 3 to 5 business days. 48-hour priority and 24-hour rush available when HPD's 21-day correction clock is running.
Direct-to-tenant friendly
Reports we issue are designed to be defensible if a tenant goes to Housing Court. Plain methods, plain results, no jargon-as-cover.
AIHA EMLAP-accredited
Our microbiology lab is third-party audited under AIHA EMLAP, which is the credential HPD inspectors look for on the cover page.
What this looks like in practice
A tenant files a 311 complaint
HPD inspects within roughly 10 days. If a Class C violation is issued, you have 21 days to certify correction. A licensed assessor must inspect, prescribe a remediation plan, and sign off post-work. The lab analysis backs up both ends. We work directly with whichever assessor you hire.
Unit turnover with visible growth
Even without a complaint, most managers now treat any visible mold over 10 sq ft as a Local Law 55 event. Assessor in, remediator in, post-remediation lab in, then re-let. Skipping any of these steps creates a paper trail problem later.
Building-wide moisture event
Roof leak, riser break, basement flood. The smart move is to get a baseline assessment immediately, document the affected units, and stage remediation room by room. We can run 50 spore traps a week through standard intake.
HPD violation closeout
To certify correction with HPD, you need the assessor's post-remediation report and the supporting lab analysis. Without the lab work, the assessor's report is harder to defend. We turn around the lab side within 48 hours when the 21-day clock matters.
Have an HPD violation on the clock?
If you've got an open Class C violation or a Housing Court date coming up, call us. We'll work directly with your assessor or remediator to get the lab side done inside your timeline.