http://www.wilkinsonplus.com/invt/wa00030
concrete base, put in a cheap woodburner or paraffin heater?
Me and a mate are just in the process of completing a "workshop" for him.
Thats 5.2m x3.5m or so.
Its got 50mm kingspan insulation, 100mmx50mm stud walls covered with a sheet of ply on the inside and out ,the outside ply covered with Tyvek then battoned out and tongued and grooved boards on the outside, a window in the back end, side door and two large garage doors that I made up.
He's found a source of reconstituted marble flooring thats supposed to be a fiver per square yard so it's getting that as well all being well.
We got the art room benches out of a local school that was being demolished and as soon as the floors levelled up and in right its getting the woodburning stove built from a gas cylinder that we made for the place as well.
I reckon its going to be nicer environment than most peoples home office
Including the foundations I reckon its going to be about two and a half to three grand all in.