I applied for a prior approval for a 6 metre extension on the ground floor in our mid terraced home with a pitched roof and the neighbours agreed initially but one of them expressed concern about the light to their ground floor kitchen window. The other neighbour has no problems as his extension is larger than the one I planned. The council refused the prior approval citing that light will be reduced to the concerned neighbour. There were no planning officers involved as it was prior approval application. Any suggestions on next steps?