As if I didn't have enough part started and not even started stuff to do, I've been asked to work out what a garden room would cost. I said £10k, I wasn't believed so I've made up an estimate for something I don't know how to do and taken my best stab at it.   It would be a trapezium (?) shaped building due to the shape of the bottom of the garden, surrounded by trees and about 5m from a stream. It would be 1m from the boundary one each side. It would be approximately 27m2, constructed