I looked into this pretty extensively when Italy announced it and like most government initiatives there it's a borderline scam and was done for the PR not because it makes sense. Each of these houses requires extensive renovation work, usually of the type that can only be performed by an expensive specialized contractor. Besides the expected costs for this work (Which will be at least 20k Euros up to 200k or more) y…
Maybe, but this is a constant, no matter how much you initially paid the house (to be restructured).
Strangely enough, for a few hundred thousands of dollars/Euros, a large number of houses already perfectly rehabiitated are available that you can buy and enter into in a matter of a few days.
Also, in all western world you will need to comply with building regulations, build masonry and plants according to norms, have licensed architects and engineers for the projects, "fight" with contractors, etc., etc.
Italy is not much worse or different than other countries in this regard, maybe - it greatly depends on the specific place - permmits will talke a little longer than in other places, but all the rest will be very similar in any EU country.