You can check the walls and ceilings for water stains, the floors for warping and buckling, and the pipes for corrosion, leaks, missing grout, and mould. Attics and basements may have damaged flooring, mildew or mould, dampness, and odours. Also, be sure to inspect the exterior of the home for cracked roof tiles, puddles, standing water, and whether the ground is sloping away from the house.