It took us over a year to get planning permission for an extension (converting outbuildings into an annex for my elderly mother in law) and to paint the rendered stonework on the front of the house. Also many hours of phone calls, letters, and site visits from various officials. Finally got the permission and work started. When the building was up to first floor, we were told that we had not got permission to take down an old wall that had been at the back of the outbuildings and had to apply for retrospective planning. (The stones from the wall had already been used in the new build) You will need a lot of time and patience Good Luck
And by the way we only wanted to paint the front of the house a neutral cream colour not purple or lime green!!