You can refer to the informal guidance on the Planning Portal. If you need us to answer the question ‘do I need planning permission’ or you just want formal confirmation, you can apply for a Certificate of Lawful Development. The certificate will give you a legally binding answer on whether the work you plan to do would need planning permission or not. This may be a useful document if you ever need to prove that something did not require permission e.g. when selling your home.
We can only answer questions on whether Planning Permission is required through this formal process.
You can apply for a Certificate of Lawful Development online through the Planning Portal. Please refer to our webpage Apply for planning permission to see what documents/drawings will be required with your application.
There is a fee - use the Planning Portal fee calculator to find out how much you'll need to pay or download their Guide to Fees for Planning Applications in England.