Buying a home is one of the most important purchases you will make in your lifetime, so you should be sure that the home you want to buy is in good condition. A home inspection is an evaluation of a home’s condition by a trained expert. During a home inspection, a qualified inspector takes an in-depth and impartial look at the property you plan to buy. The inspector will:

• Evaluate the physical condition: the structure, construction and mechanical systems.
• Identify items that should be repaired or replaced.
• Estimate the remaining useful life of the major systems (such as electrical, plumbing, heating, air conditioning), equipment, structure, and finishes.

After the inspection is complete, you will receive a written report of the findings from the home inspector, usually within five to seven days.

Source:  http://publications.usa.gov