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Most experts would not recommend hanging wallpaper over existing wallpaper more than twice. Even if the walls are in good condition and primed well, that third layer of wallpaper could cause problems with adhesion. Unless you like bubbling paint and peeling wallpaper as an interior design choice, it’s better to remove at least one existing layer before adding any more to a wall.

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. 

There can be too much of a good thing when it comes to accent walls, so avoid creating one in every room in your house. Some rooms, like bathrooms and kitchens, don’t naturally lend themselves to accent walls, so it’s best to skip them there. Of course, your home should reflect your own sense of style, so if accent walls in multiple rooms appeal to you, there’s no hard-and-fast rule forbidding it.

In most cases, you cannot wallpaper over existing wallpaper. It’s possible to wallpaper over non-coated wallpaper, but vinyl-coated wallpaper is much more prevalent in homes, so you generally shouldn’t put new wallpaper over existing wallpaper. Adding a layer of wallpaper over vinyl-coated paper will lead to poor adhesion, leaving behind bubbles and imperfections in your wall. Plus, wallpapering over vinyl-coated wallpaper can lead to mold growth, which can be hazardous to your health. It’s usually best to hire a local wallpaper removal service to handle the task to avoid these issues.