lees price is about what most people will quote you tbh, mine is pretty big if i may say so myself

full length, stairs with 3 levels, 6 newel posts, full width dormer, two velux, built in wardrobes and lowe end storage, full wired, two radiators, in roof lighting, it wasnt anything near 20k.
shop around pal, dont ask the loft conversion people as they will try to pull your pants down. in all honousty from my experiance with all the building work i have had done and done myself the building trade - brickies-plasterers-plumbers-electricians are more robbing gits in general than the motor trade ever is or has been.
present company accepted.
you do really need to have a good look around, then ask them to show you the actual work in hours, as also from experiance the building trade seam to have their own set of working hours that they seam to want to charge you for, even when theyre not at your property. ive had all the lame excuses in the world. ive queriedinvoices and asked where they get the labour figure from, and been told " well i was at the merchants" - what aload of bollox, if your not at my property doing what im paying you to do that aint my problem.
just be careful thats all i will say.