Apartment block roof being completely renewed. Changing from felt/shingle roof to tiled roof. Do we need to get permission for a change of roofing material? We have been told that way the roof is constructed is enshrined in the law and we would be changing building permissions. The original roof struts are beginning to bow and the roof needs a major overhaul. Would anybody be able to advise on this? We were also going to set up a management plan, but have been told that if anyone objects the roof repair will be cancelled. Any advice appreciated on how roof repairs links with priority set up of management plan. Also, the rooms are attic rooms in use. Has anyone experienced having a new roof, on top of attic rooms that are in use? What is the impact of a new roof on the ceilings of this living space? Thanks.