TL;DR Interior Trim Styles Interior trim might seem subtle, but it has a major impact on your home’s style and atmosphere. This article breaks down the key types, materials, and design uses of interior trim so you can make confident, cohesive choices. 1. What Interior Trim Does Frames walls, doors, windows, and ceilings for a polished finish. Hides gaps, seams, and imperfections. Enhances architectural character and ties a design together. 2. Common Trim Materials Wood:  Clas