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Mold Remediation in Brooklyn, NYC (Pre-War Brownstones & Walk-Ups)

Two facts about Brooklyn: roach and rodent infestations run ahead of average, and the landlord legally owns most of them. Our remediation pros help you get the bill right.

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Mold Remediation in Brooklyn
Ongoing NeedsBrooklyn
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
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
LOCAL CONTEXT
Brownstones
OverviewCommon requestsCostsFAQs

What to expect from mold remediation in Brooklyn

Get free quotes from local remediation pros serving Brooklyn. Providers here handle mold inspection, remediation, air quality testing. The median Brooklyn apartment building went up in 1927, 51.9% of apartments sit in buildings from before 1940 (citywide 45.8%), and 51% are in buildings of five floors or fewer (citywide 37.1%).

HPD issued 35 violations per 100 apartments in Brooklyn over the 12 months to September 2026, above the citywide 30.1. Immediately hazardous Class C conditions ran 9.7 per 100 apartments against 9.2 citywide, and 42.7% of buildings recorded none. Area figures describe 78,609 buildings holding 834,201 apartments, so check the specific address before you sign: one building's record can sit far from its neighborhood's average.

PRO TIP, Brooklyn

Rodent complaints ran 3.3 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 Brooklyn 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.

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What the Records Show in Brooklyn

Buildings in Brooklyn averaged 35 HPD violations per 100 apartments over the 12 months to September 2026, above the citywide 30.1. Immediately hazardous Class C conditions ran 9.7 per 100 apartments against 9.2 citywide, and 42.7% of buildings recorded none at all.

MeasureBrooklynCitywide
Apartment buildings78,609172,071
Apartments834,2012,846,490
HPD violations per 100 apartments3530.1
Class C (immediately hazardous) per 1009.79.2
Buildings with no violations42.7%45.3%
Apartments in pre-1940 buildings51.9%45.8%
Median year built1927n/a

Figures cover buildings with three or more apartments in Greenpoint, Williamsburg, South Williamsburg, East Williamsburg, Brooklyn Heights, Downtown Brooklyn-DUMBO-Boerum Hill, Fort Greene, Clinton Hill, Bedford-Stuyvesant (West), Bedford-Stuyvesant (East), Bushwick (West), Bushwick (East), Cypress Hills, East New York (North), East New York-New Lots, Spring Creek-Starrett City, East New York-City Line, Carroll Gardens-Cobble Hill-Gowanus-Red Hook, Park Slope, Windsor Terrace-South Slope, Sunset Park (West), Sunset Park (Central), Prospect Heights, Crown Heights (North), Crown Heights (South), Prospect Lefferts Gardens-Wingate, Bay Ridge, Dyker Heights, Bensonhurst, Bath Beach, Gravesend (West), Sunset Park (East)-Borough Park (West), Borough Park, Kensington, Mapleton-Midwood (West), Gravesend (South), Coney Island-Sea Gate, Brighton Beach, Flatbush, Flatbush (West)-Ditmas Park-Parkville, Midwood, Gravesend (East)-Homecrest, Madison, Sheepshead Bay-Manhattan Beach-Gerritsen Beach, Ocean Hill, Brownsville, East Flatbush-Erasmus, East Flatbush-Farragut, East Flatbush-Rugby, East Flatbush-Remsen Village, Flatlands, Marine Park-Mill Basin-Bergen Beach, Canarsie, 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 Brooklyn typically request

  • mold inspection
  • remediation
  • air quality testing
  • moisture mapping
  • post-flood treatment

Mold Remediation costs in Brooklyn

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 Brooklyn: questions answered

What building issues should I know about when hiring mold remediation in Brooklyn?
Tenants in Brooklyn filed about 2,985 housing complaints to 311 in the 12 months to September 2026. Heat and hot water accounted for 45.4% of them, ahead of unsanitary conditions and pests at 14.3%. Rodent complaints ran 3.3 per 1,000 apartments, below the citywide 8.8. HPD issued 35 violations per 100 apartments in Brooklyn over the 12 months to September 2026, above the citywide 30.1. Immediately hazardous Class C conditions ran 9.7 per 100 apartments against 9.2 citywide, and 42.7% of buildings recorded none.
Why does the Brooklyn building record matter when booking mold remediation?
Area figures describe 78,609 buildings holding 834,201 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 Brooklyn buildings typically look like and how does that affect mold remediation?
The median Brooklyn apartment building went up in 1927, 51.9% of apartments sit in buildings from before 1940 (citywide 45.8%), and 51% 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.

Free Quotes in Brooklyn

Tell us your address and what you need. You'll get quotes from local pros who know the building stock and quirks of Brooklyn.