“The planning system plays an important role in modern society by helping to protect the environment in our towns and cities and in the countryside”
“The purpose of the planning system is to protect amenity and the environment in the public interest. It is not designed to protect the interests of one person over another”.
The two statements above are reproduced from the DTLR Planning Guide for Householders, (a slightly out of date publication still being given out by planning offices produced by a government department that has since morphed into something new).
Whatever your opinion on the veracity of the statements, with the exception of certain small projects termed permitted development, you will need the permission of your Local Authority Planning Department to carry out any other development. Whether it is a new home, extensions to an existing home, new buildings within the curtilage of an existing building, change of use of buildings or land, and many other possibilities, your Local Authority Planning Department will want to know about it.