The email that works
What to tell your landlord about mold
Updated 2026-09-28 · Look closer · Written with Ava, the ClearNest guide
Tell your landlord about mold with photos, the room, the date, whether the smell tracks the fan, and a humidity number if you have one. Ask for the water to be fixed and the wet material addressed. Skip species names, accusations, and a list of symptoms as the whole case. Keep a copy. If someone is struggling to breathe, get medical care the same day.
You can't see most of it. A clean-looking home can still hide moisture behind the walls and in the ducts. The way through is a plan, not a scare.
The building has a file. You should too.
A verbal "it's damp in here" disappears. A landlord mold complaint that lands is short, dated, and visual. I have watched vague emails get a plug-in air freshener and specific emails get a fan duct that finally left the building. You are not writing a lawsuit. You are writing a work order a person can act on.
Look at what you can prove. A soft ceiling is different from a speck on caulk. A smell only when the heat starts is a system clue. A bathroom that never dries is a fan clue. Name the mechanism you can see. Leave the Latin alone. Color is not a species.
What belongs in the note
Room, date, what you see, what you smell, who sleeps there, what you have already done that did not involve opening a wall. Attach photos. If you measured humidity, put the number in. Ask them to fix the water source and to tell you when someone will look. Ask them not to paint over a wet stain.
Should I say black mold?
You can say the growth is dark. Do not claim a species from a photo. The repair is about water either way.
Should I list every symptom?
One line is enough: who feels worse at home, and that a doctor is involved if that is true. The building repair is not a medical diagnosis.
What if they say it is mildew and normal?
Mildew is a moisture story too. Ask what they will do about the water. A normal smell that returns is not a clearance.
What if they enter and spray?
Ask what was sprayed and whether the material underneath was dry. Fragrance and biocide on a wet wall is not a finished repair.
If they go quiet
Send it again, same facts, new date. Many places treat written notice as the clock. Tenant rules are local, so a legal aid clinic beats a forum if you are deciding on escrow or breaking a lease. While you wait, keep the room under about 50 percent if a portable unit can do it, and keep kids out of a soft, musty bedroom.
Past about 10 square feet, or anything in the HVAC insulation, the right vendor is a remediator, not a handyman with a sprayer. You can say that without sounding like you googled yourself into a panic. The size line is the sentence.
You still get a plan
ClearNest's assessment turns the apartment into an order: what you do tonight, what you hand the landlord. Unlock it for $99, with Ava after you are in, so the email is not the only tool you have. The fan in the ceiling does not care whose name is on the deed.
If this is your house, the free 60-second check names the rooms. Ava turns what you can't see into an order you can finish. The protocol is $99 once the plan is on the screen.
You can't see it. You can still change it.
The air behind the walls has a protocol.
A clean-looking room can still feel wrong. The free check names your rooms and a plan. The protocol is the calm order after that.
Start free 60-second check- 14-day refund if it isn't useful for your home.
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Common questions
Do I need an air test before I write them?+
No. A photo of a wet wall is more useful than a settle plate. Tests come if a professional needs them for the scope.
Can I hire my own remediator in a rental?+
Only if the lease and the landlord allow the work. Paying to open their wall can get messy. Document first. Get permission in writing before anyone cuts.
What if the mold is in my furniture, not their wall?+
That part is yours. Pull it out, dry the hard surfaces, and let go of porous pieces that stayed wet. The wall behind it may still be their leak.
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Educational home guidance, not a diagnosis or a lab test. ClearNest does not treat illness. Read the full disclaimer.
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