Hi,
Way 1202238830 for building house is 'not very good' ... 
First the JOSM validator would have given you a warning that 2 nodes were duplicates of each other. 

See https://tools.geofabrik.de/osmi/?view=areas&lon=149.62249&lat=-33.44073&zoom=19&baselayer=Geofabrik%20Standard&overlays=duplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways%2Cduplicate_node%2Csingle_node_in_way%2Cduplicate_segment%2Cway_in_multiple_rings%2Cintersection%2Cintersecting_segments%2Cring_not_closed%2Ctouching_rings%2Crole_should_be_inner%2Crole_should_be_outer%2Cinner_with_same_tags%2Cways

These can be merged into one node without loss of data. 
Second the DCS Imagery would have given you better imagery to better map the house. 

I leave this for you to look at. 