Design-build remodeling in St. Louis and St. Charles. Aptitude Design & Build specializes in kitchen, bathroom, basement, and whole-home remodeling. Aptitude Design & Build is a St. Louis remodeling contractor specializing in kitchen remodeling, bathroom remodeling, basement finishing, home renovations, and design-build construction throughout St. Louis, St. Charles, Clayton, Ladue, Frontenac, and surrounding communities.