A friend of mine in Zaandam had to get some substantial piling done before he could get permission for his garage. OK it was a two story industrial unit but it shows how unstable a lot of the reclaimed land is. His house, garage and a large area around it now flattened after a buy out by a housing consortium. Financially that didn't do him any harm and he's now rebuilt his garage with lift etc into a rather nice bungalow not too many miles away.