You should use this page if:
- You are unsure whether you need planning permission for works you are carrying out
- Building works have already been carried out and you would like to find out whether planning permission or building regulation consent should have been in place.
In these cases, please use the Planning Portal's interactive house (external link), a useful tool providing guidance and further details on common household projects.
If you're still not certain that the existing use or the construction of a building is lawful for planning purposes or that your completed project does / did not require planning permission, you can apply for a Lawful Development Certificate (LDC).