Roman Blinds are a versatile product and can be mounted inside or outside the recess of your window. However, we always recommend installing your Roman Blinds outside of your window recess so you can cover your entire window. When your Roman Blind is fully open, the panels of the blind are folded behind each other so depending on the height of your window, the blind could exceed the depth of your recess.
If you'd like to install a blind within your recess and have a seamless finish, we'd recommend a Roller Blind or Honeycomb Blind which takes up only 50mm & 25mm of depth within your recess respectively.