Am I right in assuming that if new extensions to an existing residential building are less than 100sq.m then there is no CIL obligation? If one was to also have a garden annex which would take the total new build area over 100sq.m that that would not be liable for CIL ether, as it is an Annex? Thirdly, from what I am reading lofts cannot be included in existing GIA if there is no fixed ladder or stair? This is for Hounslow Borough.