The vast majority of internal modernisations, layout reconfigurations, and structural wall removals across Kent fall safely under your Permitted Development rights, meaning formal planning permission is not required. However, you will definitely need to apply for planning permission from your local authority (such as Swale Borough Council) if your property is a listed building, sits within a designated conservation area, or if your remodelling plans involve significant external changes, such as adding structural extensions or altering the front roofline profile.