Once upon a time, it used to be free however now the government is charging £96 for the application fee.
You can claim an exemption to this fee if :
· The proposal is for extensions and alterations to a disabled person’s dwelling house to improve access, safety, comfort, etc; or
· An application for planning permission (for which a fee is payable is being made by the same applicant on the same date for the same site, buildings or land as the prior approval application.