The short version - I have a garage that could fit 4 or 5 cars (OK, all the ones in the front would have to move out to get the one in the back out, but...). I can legally only keep one of my own cars in it - I'd be OK parking my neighbour's cars in there, as long as they have parking permits, but you can only get a parking permit for one car per household. And you need a parking permit to park a car in your own garage!

Oh, and I am not allowed to wash my car in the garage, because the drain doesn't have the required oil filters, BUT I am perfectly OK washing it in the street outside the garage, where the water runs straight into the canal. Go figure.