Thanks for your reply.

The problem is that with those houses (most of them residential, no doubt), you're including many other areas, like gardens, agricultural areas, religious areas, sporting areas and commercial areas.
Also, mapping residential areas like this violates one of the main bases of OSM: verifiability.
Please, refer to the wiki for this well know problem of mapping residential areas in general:
https://wiki.openstreetmap.org/wiki/Tag:landuse%3Dresidential#When_not_to_use

Regards,
António.