They were refused planning permission for an extension because it was a Grade II listed building.他们的扩建计划未获许可，因为该建筑属于二级保护建筑。You probably won't need to apply for planning permission unless you live in a listed building or conservation area.除非你住在已列入文保名录的建筑或古建保护区之内，否则应该不需要申请规划许可。