Today

Mold in a rental: put it in writing today, then the clock runs on the landlord

Landlord duties usually start from written notice, not from when you noticed. In DC the landlord must inspect within 7 days of your written notice and remove visible mold within 30 days of the inspection. Florida landlords must keep roofs, windows, walls and plumbing in good repair. Other states differ, but the notice is what starts every one of them.

What is probably happening

The moisture source (roof, window, plumbing, exterior wall) is the building, and the building is the landlord's.
Housekeeping moisture (drying laundry indoors, never running the bathroom fan, blocked vents) can be argued as the tenant's.
There is no federal mold law for rentals. Your state or city law and your lease govern, and most rest on the landlord's duty to keep the place habitable.

Do this in the next five minutes

Photograph the mold, the water source if you can see it, and anything damaged. Date them.
Send the landlord written notice today: email plus a dated letter. Describe the location, size and any leak. Keep a copy.
Keep your things away from the wall. Bag moldy porous items.
If someone in the unit has asthma, allergies or a weak immune system, say so in the notice and ask for a timeline.
If the landlord does not act, call your city or county code enforcement or housing inspector. They can cite the building.

Do not

Do not cut open walls or pull carpet yourself. It can be treated as damage, and it releases spores.
Do not pay for your own air test to prove the point. Photos and a code inspector's report carry weight. An air number has no legal standard behind it.
Do not withhold rent without checking your state's rule. Some states allow repair and deduct with strict steps, others treat it as nonpayment.

Who to call

Your landlord, then the city inspector. A licensed remediator is the landlord's call

In DC any affected area of 10 square feet or more must be handled by a licensed assessor and remediator, and the landlord hires them. In most places the tenant's job is notice and evidence, not hiring.

Also: Water damage. If water is actively coming in, tell the landlord it is an emergency and ask for a restoration crew today, not a painter next month. Questions for that call ›

Get a free shortlist The seven questions for this trade

BestHonestPro is a free comparison resource, not a contractor. There is nothing to sign up for and we do not sell your details. When we begin connecting callers to contractors, we will be paid a referral fee by the contractor, never by you, and this line will say so.

What it should cost

$1,223 to $3,757

Typical remediation range the landlord is looking at, national average $2,368. Useful to know when they say it is 'too expensive'

Source: Angi, mold remediation cost, July 2026. View source

National published range, not a quote for your job. The full cost table for this trade is on the mold page.

Ask this contractor, on the phone, before anyone comes out

Tap each one as you ask it.

To the landlord: when will someone inspect, and will it be an independent assessor or the remover?
To the landlord: what is the moisture source, and when will it be fixed, not just the mold cleaned?
To the landlord: will you put the timeline in writing?
To code enforcement: does my city have a mold or habitability ordinance with a deadline?

End the call if

A painter sent to cover it. Paint over mold peels, and the growth continues underneath.
A remediator who is also the tester, hired by the landlord, clearing their own work.
Being asked to sign anything waiving claims before the work is done.

Insurance. Renters insurance covers your belongings, not the building. Whether it covers mold damaged belongings depends on the policy and on whether the cause was sudden. Ask your insurer in writing.

Where this comes from

Not my problem, tap through instead Every mold answer