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The cost to install carpet is $1,780 on average for 330 square feet, the size of an average living room. This cost could range from $200 to $5,000, depending on the amount of carpet, material, and type of carpet. 

If you need 500 square feet of carpet, it’ll cost $1,500 to $5,500, while 1,000 square feet of carpet costs $3,000 to $11,000. Polyester is one of the more affordable options, ranging from $1 to $3 per square foot. Wool is a more luxurious option, ranging from $4 to $20 per square foot. 

If the stairs are already covered in carpet, you will need to remove the old carpet and possibly the carpet pad. Any damage to the stairs like cracks, loose boards, or creaky treads may also need to be repaired. You may also want to sand and refinish or paint wood stairs before installing a carpet runner.

If you’re using a carpet runner instead of a traditional carpet, pay attention to your width measurements. Instead of measuring the total width of your staircase with 2 added inches for foldover, simply measure the width you’d like the runner to cover. Runners generally come in standard sizes, so you may need to approximate what would look best in your space.

In most cases, you do not need to put padding or underlayment under carpet tiles. Unlike traditional carpet, which requires a separate pad, carpet tiles are designed to be installed directly onto a firm subfloor like plywood, concrete, or tile. Many carpet tiles come with a built-in underlay and attach with peel-and-stick adhesive, double-sided carpet tape, or glue. For a more comfortable, cushioned feel, especially in residential settings, you can opt for padded carpet tiles that have a thicker underlay attached. While it's generally not recommended to install a separate pad, a compact underlayment might be used in some situations, though this typically requires professional installation. An acoustic underlay may also be considered in commercial spaces or multi-level homes where noise reduction is a priority.