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To layer wallpaper over wallpaper, inspect your existing wallpaper for problem areas. Damaged wallpaper should not be covered. If it’s okay to proceed, prep by turning off the electricity and removing any outlet and switch covers. Dust your walls and lightly rinse them to prevent the existing paper from peeling. Apply primer, then apply your new wallpaper.

The average cost of wallpaper installation is around $550 per project, or between $200 and $1,500, for most homeowners. Since projects and application areas vary wildly by size, it’s usually more helpful to have an estimate per square foot, which is between $1 and $7 per square foot, or an average of $4 per square foot. Project prices can fall above this range, though, especially if you purchase custom wallpaper or a luxury product. The best way to get an estimate for your project is to have a professional inspect your space and provide a quote.

For the most part, peel-and-stick wallpaper doesn't damage walls. However, there may be some cases when damage does occur. For example, if you try to rip the paper off the wall, you may pull away some paint at the same time.

The walls can also be damaged if they aren't prepared properly before you add the wallpaper. For example, if the coat of paint is too fresh when you put the wallpaper on the walls, it can peel away as you remove the paper. 

While you technically can put wallpaper in a bathroom, it doesn’t mean you should. Bathrooms are high-humidity areas, but if your bathroom is well-ventilated, it can work, especially depending on the placement. If the wallpaper is installed away from direct water contact, like a vanity or accent wall, it will hold up better than if it were directly next to the shower.