Quick answer
Mold cleanup in the Bronx often means apartment work: bathrooms and kitchens under a leaking unit above, winter condensation on outside walls, and mold reported under Local Law 55. We find the source, contain the unit, remove what grew and document it for owners, managers or tenants; a typical remediation runs $1,223 to $3,757 nationally.
Updated September 2026
Local conditions
What drives mold in Bronx buildings
Local Law 55 requires owners of buildings with three or more apartments to inspect units every year for mold and fix the underlying cause, and HPD completed 56,198 inspections citywide in fiscal year 2022 in response to indoor allergen complaints, most reported through 311. For owners and tenants alike that puts mold on a clock: under 10 square feet is Class A with 90 days to correct, 10 to 30 square feet is Class B with 60 days, and 30 square feet or more is Class C with 24 hours.
Winter is the other driver. January nights at Central Park average in the upper 20s, cold enough to sweat single-pane windows and uninsulated outside walls in steam-heated apartments, which is where the gray-black band behind beds and inside closets comes from.
Storms matter too. In September 2023, water backing up from the Bronx River left 6 to 8 feet in basements near the Sprain Brook Parkway in Yonkers, just north of the borough line, a reminder that heavy rain can overwhelm drainage well away from the waterfront.
Jobs we do most in the Bronx
These are the jobs Bronx owners, managers and tenants call about most.
HPD Mold Violation Remediation
Violations traced to the source, removed and documented for the correction.
Apartment Mold Remediation
Occupied units with hallway protection and building coordination.
Window Condensation Mold Removal
Sills, frames and cold outside walls that grow mold every winter.
Bathroom Mold Removal
Ceilings over showers and walls behind tile with leaks behind them.
Kitchen Mold Removal
Sink bases and cabinet walls soaked by slow drips.
Ceiling Mold Removal
Stains and growth under the apartment above.
Working in Bronx apartment buildings
We coordinate with supers and managing agents before we start, book elevators, protect hallways and keep containment inside the unit. When the source is a riser or the apartment above, we trace it through the building rather than cleaning the symptom in one unit.
For owners working through Local Law 55 findings or HPD violations, we keep the documentation consistent from unit to unit: before and after photos, readings, the source and the work done, so the file is ready when it is needed.
Neighborhoods with their own page in The Bronx
University Heights Tremont & Belmont Concourse & Highbridge Mott Haven & Melrose Parkchester
Nearby areas we also cover
Questions from The Bronx
We work for owners and managers on the correction, and can inspect and document conditions for tenants.
We answer 24/7 and prioritize Class C calls because of the 24-hour deadline.
Cold glass and outside walls condense the moisture in warm apartment air.
Yes. Send the list and we schedule by severity.