stair construction detail
Upstairs closet, these shelves would work great. Also add the molding and new doors.
Hidden Doors, Secret Rooms, and the Hardware that makes it possible! - Fine Homebuilding
Hide an attic crawlspace with a set of shelves, but leave a secret door for access!
Bookshelf slides out to reveal more storage tucked into the slanted roof area. Dachausbau als Wohnraum » Häfele Functionality World
built in drawers under eaves