My house was built in 2001, and we are starting to have problems with doors not closing and small verticle cracks inside. Is it strange that a house that new would need foundation repair? Is there something else that can be causing this? We are in north Texas and have a slab foundation. I will be calling some places for estimates, but wanted to get some ideas first. We are the second owners of this home built by DR Horton. Is it possible a builder's warranty might cover this? Our homeowners insurance only covers foundation repair caused by flooding. Thank you.