I did mine 2 years ago, stood a hipped roof up to a gable, big boxy dormer, about 5.2m x 6m with one shower room and fiddling with a few walls on the first floor to get the stairs in was <£40k.
Like you say, 50-60k should get a high spec job done.
@Hefty started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
I did mine 2 years ago, stood a hipped roof up to a gable, big boxy dormer, about 5.2m x 6m with one shower room and fiddling with a few walls on the first floor to get the stairs in was <£40k.
Like you say, 50-60k should get a high spec job done.