Yes — always remove old wallpaper before installing new peel-and-stick wallpaper.
Here’s why:
Applying over old wallpaper can cause bubbles, texture issues, and poor adhesion
The old paper might peel or lift under the new one over time
You’ll get a way smoother, more professional finish on a clean wall
Before installing your new panels, make sure the wall is:
Completely free of old wallpaper, glue residue, or paint flakes
Smooth, clean, and dry
Repainted if necessary (and let the paint cure for 2 weeks)
Taking the extra step to prep your wall properly makes all the difference!