Do baseboards and door trim need to match? Painting all window and door trim, crown molding and baseboards the same colour provides consistency, but is not a rule. For example, only black baseboards will anchor a room while having only black crown moulding will. The 50 Percent Rule Generally, vertical trim elements such as door and window casings should be smaller and have less heft than baseboards. Discover expert tips, design ideas, and common mistakes to avoid for a cohesive home interior. Interior trim may seem like a finishing detail, but it plays a huge role in the overall design of a room. Is it better to match all the doors and trim to kitchen cabinets (Pure White) or could I go with a creamier White for doors and trim? Like Greek Villa.