Dual shade pockets — housing both a blackout and sheer shade — require a 12-by-12-inch pocket built into the attic space above each window, which must be designed into the roof trusses before they are manufactured. Adding shade pockets after the home is built becomes a structural modification requiring a truss engineer, truss repairs, and a county or city permit. Planning them upfront with the truss manufacturer and interior designer avoids that expense and ensures every window gets the right shade solution from day one.