If you plan on installing new carpeting in your home, you might want to consider purchasing carpet padding along with it. It helps reduce wear and tear on your carpeting and helps protect it from stains and scratches. Most padding costs around $1 per square foot, but if you purchase high-quality padding it will cost around $2-$4 per square foot. In addition to carpet padding, there are other accessories that can add to the cost of your carpet installation. Carpet installation accessories include underlayment and cleaning supplies. Underlayment costs around $0.50-$1 per square foot and cleaning supplies can cost around $0.25-$1 per square foot. In order to find out how much carpet installation costs for your home, contact your local carpet store or contractor for more information.