Yes, carpeted stairs are generally considered safer than stairs with hard surfaces like wood, vinyl, or tile. Carpet provides more traction and friction, which helps reduce the chances of slips and falls. Additionally, if a fall does occur, carpet offers more cushioning, which can lessen the severity of an injury. While hard surfaces can look great, they are often more slippery. However, it's worth noting that some carpets, especially if they are new, dirty, or have a slick texture, can also pose a slipping hazard. To improve safety on any type of stair surface, you can add traction treads to increase grip.

No, it isn’t less expensive to install carpet compared to vinyl floors. The cost of installing carpet can range between $3 and $11 per square foot, so it falls just over the cost of installing vinyl flooring, at an average of $3 to $7 per square foot. High-quality carpeting can also range much higher, even up to $20 per square foot.

While it is possible to install carpet yourself, it is a challenging DIY project that requires precise measurement, proper cutting skills, and knowledge of correct installation techniques. The process involves multiple steps, including removing old flooring, installing underlayment and tack strips, and stretching the carpet to prevent wrinkles, which can take several days to complete.

Before starting, consider these factors:

• Warranty: Many manufacturers' warranties are voided if the carpet is not installed by a professional.

• Tools: You will need to buy or rent specialized equipment like a knee kicker, carpet stretcher, and seam roller.

• Complexity: DIY installation is most suitable for simple, straightforward rooms. Projects involving stairs or floor vents are significantly more difficult.

• Cost: While you can save on labor, the cost of tools plus the risk of expensive mistakes—which may require re-installation—can make hiring a professional more cost-effective in the long run.

Given the potential for errors, voided warranties, and the need for special tools, hiring a local carpet installer is often recommended to ensure the job is done correctly and safely.

If the installer is unwilling to fix the problems and you’re not interested in seeking remediation, you could hide a visually unpleasant floor. This will only work if the floor is structurally sound and the only issue you have is the way it looks. The easiest way to do this is to use large area rugs. You can also paint the floor, although that’s a labor-intensive job if you want to go the DIY route.