Level 5 is the highest standard of drywall finish. It involves applying a skim coat of joint compound over the entire wall surface after taping and sanding, which eliminates any visible imperfections, seams, or texture. The result is a perfectly smooth, flat surface that is especially important in homes with natural light and clean architectural lines, where even minor irregularities would be visible. The Castella Estate features Level 5 smooth walls throughout the home.