Costs depend on wallpaper type, wall condition, labor, and necessary repairs.

The average cost to remove wallpaper is $790. The final price tag depends on the size of the room and the complexity of the project, and can range from $200 to $2,000. Usually, removing peel-and-stick wallpaper is on the lower end of the cost scale, as it doesn't require special tools to remove.

If you’re installing new wallpaper and have leftover glue, you can remove unused wallpaper paste from the bucket or pan it’s in by letting it dry. If it’s an oil-based paste, seal it in a plastic bag and throw it in the garbage. Otherwise, toss the leftover wallpaper paste in the trash. Although it’s water-soluble, don’t rinse unused wallpaper paste down the sink because it could dry in the pipes and cause a blockage.

No, you don’t always have to remove old wallpaper before applying a new layer. However, you should pull off the existing wallpaper if it’s cracked, peeling, or in poor condition. We’d also recommend against putting wallpaper over textured or dark-colored wallpaper because the old layer may be visible through the new one. In addition, if you try to hang new wallpaper over vinyl-coated wallpaper, the adhesive might not stick properly.