You can perform certain types of work without needing to apply for planning permission. These are called permitted development rights. Some work does not require planning permission. Guidance on rules that relate to permitted development can be found on the Planning Portal website.
If your plans do not fall under permitted development you will need to find out more about what permissions, consents and approvals you need.
Where to find help
Lawful development certificate
If you would like to formally clarify whether your proposal is permitted you can apply online via the Planning Portal website.
An interactive guide available on the Planning Portal will help you explore how to progress common householder projects and whether you need permissions for them or not. Please note you will need Flash to view these guides.