Trim refers to the moldings installed on-site to cover gaps and transitions — baseboards at the floor, casings around doors and windows, crown at the ceiling line. Millwork is the broader category that includes both architectural trim and custom-fabricated woodwork: built-in bookshelves, fireplace mantels, wainscoting panels, coffered ceiling grids, and decorative columns. All trim is millwork, but not all millwork is trim. RainFire Builders self-performs both categories as part of every interior project.