Things that can hurt your home's appraisal value include:
A location with few comparable home sales due to a slowing real estate market.
An outdated home with older appliances and fixtures.
A messy, dirty home with clutter.
A home with non-functioning components like a broken HVAC system or a leaking roof.
An undesirable floor plan or unusual layout.
Thankfully, there are several things you can do to prevent a low appraisal, including making upgrades, renovations, and repairs (and providing the appraiser with proof), and improving your home's curb appeal.