In construction and residential carpentry, casing refers to the specialized finishing boards and molding profiles installed around the perimeter of door and window openings to bridge the transition between the interior wall surface and the structural door or window jambs. Serving both aesthetic and functional purposes, casing covers the rough gaps and exposed framing studs left during installation, providing a clean, polished visual appearance while preventing drafts, dust accumulation, and moisture penetration. Casing profiles vary widely depending on architectural style, ranging from simple, flat, minimalist boards in contemporary modern homes to heavily ornate, multi-layered moldings in traditional or Victorian properties, often designed to match the baseboards and crown molding used throughout the rest of the interior space.
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