��������

Have you considered getting quotes from other builders?

It would be advisable to get three quotes before deciding. 

Hell, lets be adventurous and get four quotes.

i used to live in an appartment in milano,it is common/usual for the kind of works you refer to to be a source of disagreement amongst the condomini,usually the people who do not live under the roof (as in your case) tend to suggest lifting up a few tiles and renewing a bit of asphalt covering (cheap) the ones who live under the roof obviously think differently. We used to live under the roof.Interestingly it is not an opinion if the roof needs redoing it can be established (fairly quickly and easily)a qualified examination of the state of the roof (in all it's aspects) after which if you don't have a building administrator all together you organize a few quotations making sure that they are tendering to the same itemized parameters.It is highly probable that the waterproofing of the roof needs completely redoing,it is also very probable, given that it has a certain age, that proper insulation is either lacking or insufficient this is important these days for the new criteria of energy conservation,there may be more serious or structural problems, given the highly sismic nature of the the area.The condition of some or all of the tiles maybe comporomised.It's not unreasonable to think that the roof needs a complete overhaul.The price could be reasonable,which doesn't mean that it couldn't be beaten as a quote and yes scaffolding is always pricey.Local authorities will also be particularly vigilant in checks/controls being part of a village (health and safety) so there won't be short cuts to work procedures...so one way or another i'm afraid you're in for your share which is usually based on the size of apartment NOT the number of apartments (milesimi)btw