From
You must get the application to the local authority within 2 weeks of the notice appearing in the local newspaper. The site notice must be put up on or before the day you make the application and stay there for at least one month afterwards.
You must not start building before you receive the grant of permission.
Sometimes planning permission is subject to conditions, which may require changes to your proposals.
Planning permission normally lasts for five years
Does'nt say if thats for OPP or FPP. I would assume FPP.