There are different planning consents and approvals you may need to get before starting any work on your project.
Permitted development means you don't need to apply for planning permission for many common householder projects.
Works that change the external appearance of a building in a conservation area will need permission if subject to an Article 4 direction.
If you've built without permission and committed a planning breach, you'll need to submit a retrospective planning application.
We've produced some advice notes on a range of planning topics which you may find useful.
A legal document stating that enforcement action cannot be carried out to the development referred to in the certificate.