Central government's Planning Portal explains whether the work you want to do to your property is "permitted development" (in which case you don't need planning permission) or whether it is not permitted development (in which case you do need planning permission). There are useful sections on:

Information for householders

The Planning Portal gives detailed guidance on:

Further guidance

If after using the Planning Portal you still feel you need further guidance, please contact us.  

What to do next

If you're completely sure your work is permitted development and that you don't need planning permission, you can start your building work. For peace of mind and proof that your building work is lawful you may choose to apply for a Lawful Development Certificate.

If your work does not qualify as permitted development then you must apply for planning permission before going ahead.

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