yes Kelv, look at the start of the mk.2 escort build.

mine was footings...labour to dig then price of concrete...iirc £300-£400...brickie to do the block work...cannot recall price...my mate to do the roof...free...trusses were made at just over £12 each. i needed about 15 iirc.

slates..iirc...about £330.

doors go for about £250-£500 each depending the type.

concrete floor..mate to do it again for free ....about £200 iirc.

upvc window..£120. ( windows saves brick/ block etc... )

rendering for the outside,i bought the materials...£70 approx, then about £350 to get it rendered.

so all in all it was not that expensive, but you are going for a bigger size so the costs will be higher obviously.

depends on roughly what you want it building like etc...and the builders.

you then need the old one knocking down and taking away...more money.

hope that helps.