A small patch on a dry wall: you can clean this yourself
The EPA says a patch under about 10 square feet is in most cases a homeowner job, as long as the moisture source is already fixed.
What is probably happening
- Surface growth on paint or paper facing from a past leak, condensation or a humid room.
- If the wall is dry and the leak is fixed, the growth has stopped. Cleaning removes what is left.
- If the drywall is soft, crumbly or stained through, the mold is probably inside it and the panel needs cutting out, not scrubbing.
Do this in the next five minutes
- Confirm the source is fixed: no drip, no damp, no condensation. If not, go back and pick 'still wet'.
- Put on an N95 respirator, goggles and rubber or nitrile gloves. Open a window.
- Scrub hard, non porous surfaces with detergent and water. Dry completely.
- Throw out moldy porous items such as ceiling tiles, carpet padding and cardboard. Bag them before carrying them through the house.
- Photograph the patch before and after, in case it comes back.
Do not
- Do not reach for bleach first. The EPA does not recommend bleach or other biocides as a routine practice, and dead mold still causes allergic reactions, so it has to be removed, not just killed.
- Never mix bleach with ammonia or any other cleaner. The fumes are toxic.
- Do not just paint over it. Paint over mold peels, and the growth continues underneath.
- Do not pay for an air test. The EPA says that when you can see mold, sampling is unnecessary.
Who to call
Usually nobody. A mold remediation contractor if it comes back
Under about 10 square feet on a dry surface is inside the EPA's do it yourself range. A contractor earns their fee when the area is larger, hidden, or the source is unknown.
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What it should cost
Usually no contractor cost
EPA: under about 10 square feet, in most cases you can handle the job yourself. If you hire out anyway, Angi puts bathroom sized jobs at $500 to $1,000
Source: US EPA brief guide and 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.
- If I call you for a patch this small, is there a minimum charge, and what is it?
- What is the moisture source, and is finding it part of your visit?
- Will you remove the material or just treat it, and why?
End the call if
- A quote that starts with an air test for a patch you can see and measure.
- A whole house fogging or 'treatment' sold for a 2 foot patch.
- Anyone who says the patch must be identified by species before it can be cleaned. CDC: you do not need to know the type of mold.