I've been back and forth on what foundations I would like to use on our plot and I am really keen on a passive insulated raft. I had originally liked the idea, but then went off it as assumed too expensive, then read more and believe it should theoretically should be cheaper/ less hassle but I have never quanitified this.    Hence I am going do a cost vs benefit analysis to see what the actual costs are and from there assess the benefit. E.g it might still be more expensive, but if it