07811433554 dale building control private, he says no need for building control becuase it is still a dwellinghouse.
yorkshire building control
manchester
I spoke to nathan 07825158912 and he said that if the HMO is still a c4 no sound insulation or thermal insulation are mandatory since the c4 is still classed as dwellinghouse. His manchester office is 0161 660 0806 I can speak to any surveyor.
0330038132