A secret Door can add storage space to your home. If you have a door you do not use very often why not replace it with a bookshelf? Not just any bookshelf, but a bookshelf that opens.
Maybe you have a rec-room with a pool table. We can make a secret door with integrated storage for the sticks and balls.
We can make a wine rack with a built-in wine fridge.
How about your pantry door? Would it be more useful if it was a cupboard to store some of the more frequently used items?
Do you have a bookshelf in your bedroom? We can use a secret door to replace your current closet doors. You have now added storage space to an otherwise nonfunctional door.
If you can think it, we can design a way to make a secret door for it.