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Decent carpet will last around 10 years on stairs. Some less durable carpets, like polyester, will only last five years on stairs. The ideal carpet, like wool or nylon, can last about 15 to 25 years. You’ll know when to replace it when it starts wearing down. You may have to replace it sooner if it's stained, whether due to water damage or pets.

The average cost to install new flooring is around $3,162, with a typical price range between $1,530 and $4,860. On a per-square-foot basis, you can expect to pay an average of $3 to $22, including installation. Several factors influence the total price, including the flooring material, project size, geographic location, and any special features. Material choice is a significant cost driver; vinyl plank, linoleum, and carpet are on the lower end ($3 to $7 per square foot), while stone, tile, and hardwood are more expensive, with hardwood reaching up to $22 per square foot. Prices can also vary by region, and installing flooring on stairs will add to the cost, typically ranging from $11 to $160 per step.

Installing carpet over carpet may affect the warranty of the new carpet. Check with the manufacturer or retailer regarding their warranty policies. Many warranties stipulate specific installation guidelines, and installing carpet over carpet may not comply with these requirements. Voiding the warranty due to improper installation methods can leave you without help in case of issues or defects with the new carpet.

No, thick carpet padding isn’t necessarily better than thinner padding. The appropriate padding thickness will depend on the type of carpet and the amount of foot traffic in the area. 

For example, thick padding works well in low-traffic areas, like bedrooms, where you have soft and plush carpeting. However, thick carpet padding can damage low-pile carpet, which is used in the busiest parts of your home (like hallways and entryways). For that reason, it’s best to use thinner, heavier padding underneath carpet in high-traffic areas.