The 1947 Town and Country Planning Act was the beginning of modern planning, and essentially nationalised the right to develop land.
The Act required all development, with a few exceptions, to secure planning permission from its Local Authority, and contained a provision to allow an appeal against any refusal.
Due to continued changes in the law, what needs permission today might not be the same as what needed permission just a few years ago.
The Planning Portal provides guidance on common household development that does not need planning permission ("permitted development"), as well as a number of mini guides on popular projects:
Different criteria may apply to your proposed development if in association with a Listed Building and/or Conservation Area.
Even if Planning Permission is not required, you may need Building Regulations approval and the Community Infrastructure Levy (CIL) may also apply.
Planning permission may not be required for change of use, as well as a range of development in association with commercial, leisure and industrial uses and buildings.
If in doubt please see our pre application service pages.