Your profile location is UK. England? I know of 2 new airfields in Scotland, Highland, getting planning permission in this millennium. I think there's at least another in another Local Authority. The laws and planning rules are different Scotland. Wales and Northern Ireland are also likely to differ from England.
The Local Authorities may differ in their attitude. An application to build a hangar got the response that an "Aircraft Storage Shed" would be easier to get permission for. It was built.