Far too much agreement in this thread because I agree with RKQ too.
You may get your basic house cost down to well below €100/sq.ft. but the finishing out of the site or laying in the drainage connection or tank and the access and driveway will push things up to this level again.
While this seems a long way from the €167+ per sq.ft. estate design 4 bed house rebuilding guideline quoted by Bruce Shaw and the Surveyors, there doesn't seem much room for improvement below this figure, given that materials haven't dropped as fast or as far as house prices.
Also the Bruce Shaw figure is a qualified figure for house rebuilding and has notable exclusions and inclusions and can be found here.
http://www.bruceshaw.ie/cost_management/latest_publications/Bruce%20Shaw%20Handbook%202010.pdf
See P. 60 - 4 Bed 118 sq.m. = €1,804/sq.m. = over €167/sq.ft.
See the 8 qualifications listed which include; -
"The figures allow for demolition costs,
professional fees incurred in reinstatement
and VAT at 13.5% on building costs and 21%
on professional fees."
The professional surveyors have to stand over profitable figures.
Direct labour will reduce the figure as will below cost selling.
Be wary of figures that are too low - dodgy materials!
ONQ
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.