Certificate of Lawfulness
If you want formal confirmation from the council that the works you're proposing constitute permitted development, and don't need to be the subject of a planning application, you can apply for a Certificate of Lawfulness.
In addition to the usual certificate of lawfulness applications, West Lothian Council offers a certificate of lawfulness service tailored to householders, which will give you a formal decision notice and stamped plans which you will be able to show to prospective buyers when you sell your house. The cost of this is £101, half the fee for a householder planning application. You can submit your application through the Government's ePlanning website or by using the council's forms below, (proposed use or development).