hi please can you tell me if my inlaws have had a decent job done and was it too much? Any way the job was to replace existing projected flat roof garage and hall on front of house ,and to fit mono pitched tiled roof . the roof area was about 15 feet by 6 feet. any way the builder only took up single skin brick walls and fitted monopitched roof tiled but left old flat roof deck under . he did refit guttering and facia job cost £ 3400 was that alot and should the wall have been cavity and insulated .and should the deck have been totally ripped off and insulated? have been insulated ? should building regs been applied for? any way any builder help me with this please ?