How much to build a house per sqr metere?

So I've been looking around for a while at building a small standard "affordable" 46 square meter bungalow up in scotland and I've been quoted 2,100 (£96,000 , 1,560 £71k before had another company say they charge 900 per sqr meter but that's a pre fab cabin company, of course all the... show more So I've been looking around for a while at building a small standard "affordable" 46 square meter bungalow up in scotland and I've been quoted 2,100 (£96,000 , 1,560 £71k before had another company say they charge 900 per sqr meter but that's a pre fab cabin company, of course all the companies I've looked at before have different standard's and expierence/abbilities, I'm now trying the route of just going through local companies and independant builders as well as learning some of the trade myself, I've spent the last couple of years working hard as hell trying to save for a possible build after looking at many different "affordable" building types ie tiny houses and cabins etc... of course I know I'll also have ground work cost, fittings etc.. below is a layout

https://photos.app.goo.gl/sWpiPcGThfQ8UDzk8
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