Hi there Bobe, welcome to OSM. 
Just a small tip, in ID, the OSM web based editor, you can press `Q` to square a way. this would make your houses a lot cleaner. Also semi-detached houses should be connected by at least 2 nodes, you can simply drag nodes on to other nodes or lines to connect them. Hope this helps.
Kind regards,
Kits
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            Published using OSMCha: https://osmcha.org/changesets/153622823
            