How often do carpets need to be changed?

Most carpet manufacturers include a "rated for" length of time for the life of the carpet. The most common is 10 years. The price of the carpet usually reflects the life expectation of the carpet. The more expensive carpet will generally last longer. If you have purchased a new house, you can get the carpet information from the builder. It you have purchased a pre-owned house, you should ask the seller when the carpet was last replaced. If the seller replaced it prior to sale, ask for the paperwork, or plan on replacing it within 5 years, since sellers always choose the most inexpensive carpet. Other factors on the life of a carpet are maintenance and wear pattern. For longer life, frequent vacuuming is important, and yearly (at least)professional cleaning.