Yesterday, I started mapping house numbers. Since the roads were pretty complete and almost all POIs I knew were OK, I had to find something else. I can't start drawing buildings since I don't have aerial material, so I began mapping house numbers.
Mapping house numbers is a quite huge job. When I do it, I try to map every house that stands separate. If houses stand close to each other for a longer row, I map about every 5th house and connect them with an addr:interpolation way.
I understand why there are so little house numbers in the database. It's quite a job, you can't do armchair mapping (no data available) and the result is only a few numbers on the map. You don't get to see the result that was intended: better search.
Are there any other mappers doing house numbers?