Mold in a Buffalo Rental: Tenant Rights and Next Steps

Mold in a Buffalo rental

New York law requires landlords to keep a rental fit to live in, and mold fed by a leak is usually a habitability problem. Start with a written notice to the landlord. Much of Buffalo's old housing is rented, so this comes up a lot.

Updated October 29, 2026 · Sources listed at the end

Why this is common here

In the ten oldest ZIP codes in our table, 60% of occupied homes are rented, against 27% in the ten newest (Census ACS 2020-2024). In 14201, Allentown and the Lower West Side, it's 76%. A lot of that is upper and lower flats in houses built before 1940, sharing one old basement and one old roof, where a leak in one unit shows up in the other.

What the law says

Real Property Law section 235-b, the warranty of habitability, says a landlord warrants that the premises are fit to live in and that tenants won't be subjected to conditions dangerous to their life, health or safety. The statute never mentions mold by name. An active leak and the mold it feeds are the kind of condition it covers. The warranty can't be waived in a lease.

Inside the city, Buffalo's Proactive Rental Inspections law, adopted in 2020, puts investor-owned singles and doubles on a schedule of inspections and requires a Certificate of Rental Compliance, renewed every three years. Whether a given house has actually been inspected is another matter; residents and advocates sued the city saying it hasn't carried out the inspections, and an appeal was filed in October 2025.

What to do, in order

Photograph it with dates, and the leak if you can see it.
Tell the landlord in writing: text or email is fine. Say where it is, how big, and that you want it fixed. Keep a copy.
Give a reasonable time, and allow access for repairs.
If nothing happens, contact the city about the building's rental compliance, or a tenant advocacy group or legal aid office for options. Withholding rent has rules; get advice before you do it.

Don't paint over it or bleach a large patch yourself. You'll destroy the evidence and maybe spread spores.

Who cleans it up

Under section 933 of the Labor Law, owners of buildings with four or fewer units, and their own employees, may do mold work in those buildings without a state mold license. Bigger jobs done by an outside company over 10 square feet need a licensed assessor and a separate licensed remediation contractor. Either way, the water has to stop or it grows back.

General information, not legal advice. For your situation, talk to a lawyer or a tenant legal services office.

Questions Buffalo homeowners ask

My landlord won't fix the mold. What can I do?

New York's warranty of habitability (Real Property Law 235-b) requires landlords to keep a rental fit to live in and free of conditions dangerous to life, health or safety. Tell the landlord in writing first, with photos and dates. Inside Buffalo, investor-owned singles and doubles also fall under the city's 2020 Proactive Rental Inspections law, which requires a Certificate of Rental Compliance renewed every three years. This is general information, not legal advice.

Can I break my lease over mold in New York?

Sometimes, if the conditions are serious enough to violate the warranty of habitability, but it depends on the facts and the steps you take. Put everything in writing first and get advice from a lawyer or tenant legal services before moving out.

Does the landlord need a licensed mold company?

Not always. New York lets owners of buildings with four or fewer units, and their employees, do mold work in their own buildings without a mold license. An outside company doing a job over 10 square feet needs the state licenses.