If you don’t put padding under your carpet, the carpet won’t be protected from wear on the underside. This could result in a shorter life span for your carpet and increased carpet repair costs over time. An unpadded carpet can also be less comfortable to walk on, depending on your subfloor and the type of carpet.

If you want your carpet to last as long as possible, then yes, you need to install carpet padding. Carpet padding creates a layer of protection between the back of your carpet and the floor beneath it, which decreases friction and reduces wear and tear. Aside from that, carpet padding also helps absorb noise and makes your carpet feel more comfortable underfoot.

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.

Smaller carpet installations may take less than a day, while full-home installations can take several days. However, your carpet installation timeline will ultimately depend on a few factors, including the number of rooms you’re renovating, the project’s total square footage, and the carpet type. Installation will take longer if your carpet company needs to repair your subfloor or remove old tile flooring.