Mold Remediation in Williamsburg, NYC (Converted Warehouses & Walk-Ups)
Williamsburg has standards. And before they show up, we help you check the building so you know what you're hiring for. Get free quotes from companies serving Williamsburg.
An assessment is often booked within a week; remediation follows the written plan and ends with a passed clearance report, usually two to three weeks end to end
COST RANGE
Small jobs under 10 square feet can be done without a licensed contractor; licensed jobs commonly run into the low thousands, and HPD's own emergency mold repairs averaged $2,089 per apartment in fiscal 2025
What to expect from mold remediation in Williamsburg
Get free quotes from local remediation pros serving Williamsburg. Providers here handle mold inspection, remediation, air quality testing. The median Williamsburg apartment building went up in 1910, 46.9% of apartments sit in buildings from before 1940 (citywide 45.8%), and 35.7% are in buildings of five floors or fewer (citywide 37.1%).
HPD issued 17.1 violations per 100 apartments in Williamsburg over the 12 months to September 2026, below the citywide 30.1. Immediately hazardous Class C conditions ran 4.5 per 100 apartments against 9.2 citywide, and 48.2% of buildings recorded none. Area figures describe 2,035 buildings holding 31,792 apartments, so check the specific address before you sign: one building's record can sit far from its neighborhood's average.
PRO TIP, Williamsburg
Rodent complaints ran 7.2 per 1,000 apartments, below the citywide 8.8. HPD treats rodents and roaches as a Class C condition with 21 days to correct, and Local Law 55 puts an ongoing duty on owners of buildings with three or more apartments, so report it to the landlord in writing as well as booking treatment.
Check Williamsburg Building Violations Before You Book
Run the address through the free lookup first. It returns HPD violations, complaints, registration and legal actions, DOB violations, permits and ECB summonses, executed evictions, rodent and bed bug reports, rent stabilization status and nearby 311 calls for that building.
Buildings in Williamsburg averaged 17.1 HPD violations per 100 apartments over the 12 months to September 2026, below the citywide 30.1. Immediately hazardous Class C conditions ran 4.5 per 100 apartments against 9.2 citywide, and 48.2% of buildings recorded none at all.
Measure
Williamsburg
Citywide
Apartment buildings
2,035
172,071
Apartments
31,792
2,846,490
HPD violations per 100 apartments
17.1
30.1
Class C (immediately hazardous) per 100
4.5
9.2
Buildings with no violations
48.2%
45.3%
Apartments in pre-1940 buildings
46.9%
45.8%
Median year built
1910
n/a
Figures cover buildings with three or more apartments in Williamsburg, using HPD violations inspected in the 12 months to September 2026 and city lot records. Citywide figures use the same method. Search a specific address for that building’s own record.
What people in Williamsburg typically request
mold inspection
remediation
air quality testing
moisture mapping
post-flood treatment
Mold Remediation costs in Williamsburg
TYPICAL RANGE
Small jobs under 10 square feet can be done without a licensed contractor; licensed jobs commonly run into the low thousands, and HPD's own emergency mold repairs averaged $2,089 per apartment in fiscal 2025
TIMELINE
An assessment is often booked within a week; remediation follows the written plan and ends with a passed clearance report, usually two to three weeks end to end
Mold Remediation in Williamsburg: questions answered
What building issues should I know about when hiring mold remediation in Williamsburg?
Tenants in Williamsburg filed about 6,686 housing complaints to 311 in the 12 months to September 2026. Heat and hot water accounted for 38% of them, ahead of unsanitary conditions and pests at 16.5%. Rodent complaints ran 7.2 per 1,000 apartments, below the citywide 8.8. HPD issued 17.1 violations per 100 apartments in Williamsburg over the 12 months to September 2026, below the citywide 30.1. Immediately hazardous Class C conditions ran 4.5 per 100 apartments against 9.2 citywide, and 48.2% of buildings recorded none.
Why does the Williamsburg building record matter when booking mold remediation?
Area figures describe 2,035 buildings holding 31,792 apartments, so check the specific address before you sign: one building's record can sit far from its neighborhood's average. Building age and condition change access, scope and timing for mold remediation work.
What do Williamsburg buildings typically look like and how does that affect mold remediation?
The median Williamsburg apartment building went up in 1910, 46.9% of apartments sit in buildings from before 1940 (citywide 45.8%), and 35.7% are in buildings of five floors or fewer (citywide 37.1%). Older stock leaves more gaps and moisture paths for pests to use between apartments.
Do I need a licensed mold remediation company in New York?
For any mold project over ten square feet, yes. New York State requires a licensed mold assessor to inspect and write a plan and a separate licensed remediation contractor to do the work, and the same person cannot do both on the same property. Under ten square feet you may clean it yourself. In buildings with ten or more apartments, city law requires the owner to use licensed outside contractors for every job over ten square feet.
How much does mold remediation cost in NYC?
No reliable city price survey exists. Online estimates range from $1,000 to $5,000 for an average job up to $17 to $34 per square foot. The best anchor is the city's own spending: HPD's emergency mold repairs averaged $2,089 per apartment in fiscal 2025. A bathroom or bedroom wall typically lands near that; a flooded apartment costs multiples of it, plus rebuilding and the leak repair.
Who pays for mold removal in a NYC apartment?
The landlord, in a rental. Mold is a housing code violation graded by size, from Class A under ten square feet with 90 days to fix, to Class C at thirty square feet or more with 21 days, and the landlord must also repair the leak behind it. Report it in writing, then file a 311 complaint if nothing happens.
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