Belgian houses are exceptionally ugly. Very badly proportioned. Belgium has the most beautiful cities in the world, but what that really means is that all the attractive areas predate the 30s. Once outside, it's a shockingly ugly country. Architects cannot seem to balance anything, weirdly positioned windows everywhere (e.g. https://www.a2o-architecten.be/work/vaartkom, this is so typical of all the dreck I saw going up there). Sad to see you use Leuven as an example. When I lived there some decade ago, all new buildings going up were unfathomably ugly. The old core was perfection though.

Kudos to Belgium to preserving its heritage so well, big thumbs down to being a black hole for architecture today.