Hi. Can anyone tell me if a principal elevation can change after alteration of a house?The widest part of my house fronts the road and historically the front door was here. The house is around 150 years old. 5 yrs ago we made a "side door" the front door and access it by drive and blocked in old front door. We built a porch around the new front door so that this side of the house looks like front of house. The planners have said this changes the principal elevation to the new front of the house I understood that principal elevation related to the original house as of 1948 and couldn't change even after alterations. Any suggestions if planners are right? Many thanks. Tim