Mold in the house: what to do
Find and fix the water problem first, or mold comes back. The EPA says patches under about 10 square feet (about 3 by 3 feet) can often be cleaned with soap and water while wearing gloves, goggles and a mask. Call a mold remediation pro for bigger areas, mold in air ducts, or after sewage or flooding.
Your checklist
- Find and fix the water
- Small patch: clean it safely
- Wear gloves, goggles and a mask
- Dry everything within a day or two
- Big patch or ducts: call a pro
- Renting? Tell the landlord in writing
Rather read it? Here’s the whole thing.
Signs of mold
A musty smell, spots on walls or ceilings, peeling or bubbling paint, or allergy symptoms that get better when you leave home.
Fix the water first
Leaks, high humidity and past flooding feed mold. If you don’t fix the moisture, the mold comes back.
Small patches
The EPA says areas under about 10 square feet can often be cleaned with soap and water. Wear gloves, goggles and a mask. Dry everything within a day or two, and throw away soaked carpet, ceiling tiles or drywall.
When to call a pro
For larger areas, mold in air ducts, after sewage backups or big floods, or if someone in the home has health problems.
Testing
If you can see or smell mold, the fix is the same: remove it and fix the moisture. Testing helps in special cases.
Renting?
Tell your landlord in writing, keep a copy and take photos. Many states require landlords to fix leaks and keep homes livable.
Cost
Small jobs can be a few hundred dollars; large ones much more. Get written quotes.
Common questions
Is black mold more dangerous?
Any mold can cause problems for some people. The color doesn’t change the plan: remove it and fix the moisture.
Should I use bleach?
The EPA generally recommends soap and water. Never mix bleach with ammonia or other cleaners.
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Not yet reviewed by an expert. Last checked 2026-10-29. This is general help, not legal, medical or professional advice. Rules are different in every state.