have got a price for renovating my family home in the west,which is much the same as yours. the house is circa 100 years old with an 1970's extension with flat roof.it is been rewired, plumbed, plastered, insulated, re roofed, windows internal and external doors.bathroom is been repositioned.new stairs is been installed as the current one does not meet modern regulation.all this been done for 63,000 including vat. am employing a builder who has been building since he left school and took over fathers company. was established pre the boom and has good reputation. the house is not occupied and he estimates work will take three months
in relation to the attic this can proove costly,you will need archetict cert if you convert if you ever intend to sell and it does depend on attic space