For the German regions of Sachsen-Anhalt and Niedersachen, I thought there are probably all buildings mapped. At least those called Einfamilienhaus or Reihenhaus.

But I found that with the following overPass query, many potential spots for missing buildings data can be found:

way["landuse"="construction"]({{bbox}});

And because of that my change set statistics of today is as follows:

Edited on 2026-01-27:

• 2281 nodes
• 404 ways
• 1 relation

Most used tags for nodes:

1. natural (371)
2. addr:housenumber (48)
3. addr:street (48)
4. addr:postcode (46)
5. addr:city (46)
6. entrance (36)
7. addr:country (26)

Most used tags for ways:

1. building (319)
2. landuse (22)
3. highway (16)
4. amenity (9)
5. addr:postcode (9)
6. addr:city (9)

Conclusion

Many buildings have been added (and some trees 🌳👼) in Niedersachsen and Sachsen-Anhalt.

But as the query suggests, there are still some construction sites which can be investigated. Probably this “trick” is already known to hardcore-mapper ;)