Will the 10ft passage be concreted? If so that will require PD too so would take you over anyway.Was going to have a twin span building 100ft x 100ft which is just under 1000sq m but now thinking 2 separate buildings 100ft x 50ft with 10 ft passage in between, unfortunately this would take area including passage to over 1000sqm
(the passage would just be existing surface no new hardcore or concrete)
Just a general reminder, 1000sqm includes any hardstanding created as well, not just buildings. Concrete aprons, enlarged yards etc all require PD and affects your allowance.