25. Microbial growth
If you know the house has had water damage in the past, mold could be lurking behind the walls. Still, give the basement and attic a good sniff to see if there is any sign of a musty odor. Mold can cause serious health problems like allergies, asthma, and other respiratory problems. It takes a lot more than a bit of bleach to get rid of mold for good.
A professional mold removal team will cost anywhere from $500 to $6,000.
