The Monti government estimated in march 2012 that the global fiscal amount not perceived by Italian administrations due to illegal buildings was around 500 million Euros. According to some sources, up to 17% of the yearly building production in Italy would be illegal, implying, among other problems, urban sprawl.
The Marenostrum 2012 report, by legambiente.it, describes the situation along the coasts, only a part of the larger issue of “abusivismo elizio”. In cities like Naples or Palermo there are over 6.000 illegal buildings.
This is one of the main problems of an Italian urban planning system that produces sophisticated plans: ensuring the enforcement of the laws.