Your standard homeowners insurance policy may cover mold damage under your personal property coverage, but only if the mold is a direct result of a covered peril. But since this will vary on a case-by-case basis, homeowners insurance will often exclude it. Mold coverage is sometimes available as an endorsement or rider — in other words, an optional coverage at an added cost.
Most homeowners insurance policies exclude mold coverage, except when it is related to a covered peril like a plumbing leak.