Unable to answer "What’s the house number of this building?" – Detached House – https://osm.org/way/1003824077 via StreetComplete 58.2:

Not a house.  This is 2 garages.
One belongs to  50 Ashford drive, the other belongs to 51 thornewood ave

Attached photo(s):
https://westnordost.de/p/228592.jpg