Second line. According to public information, caston Whole House Customization is a whole house customization service company integrating home design, customization, installation and other services, belonging to a second-line brand. Whole house customization is a home customization solution that integrates home design, customization, installation and other services. Whole house customization is a consumer-specific home made by home furnishing enterprises on the basis of mass production and according to the design requirements of consumers.