Leaks are the most common problem with roofs, and are tough to detect from outside. However, from inside an attic, you can often see water marks where there is a leak.

Make sure you are confident that both water systems: the one that brings fresh water in and the one that takes sewage out are functioning well before signing on the dotted line.

Before you agree to buy you should make sure that you can run all of the appliances you want to and even power tools at the same time without having a power failure. You also want to make sure that the electrical system is safe and does not present a fire hazard.

Be sure to thoroughly inspect the heating and air conditioning systems in any home you are considering purchasing.

The paint inside and outside the house can reveal a lot about the condition of the underlying material. Check several places on several walls, using your eyes and a screwdriver for poking.

Cracks in walls, doors not closing properly and uneven floors can all be signs that there is a problem with the foundation. If the foundation is not strong, the entire house could literally collapse, so you should carefully check for these signs. A bad foundation may not mean imminent disaster, but it could be used to bargain for a lower sale price, or you could ask to have the owner repair it before the sale.