that's 111 m² usable space right?
and 4.5 people .. meaning parents and 3 kids, well, yeah, that's not super big, but everyone can have their own room (let's say 10+ m² so that's half of the house, and you still have around 50 m² for a living/dining room with kitchen, bathrooms, etc.)
it sounds lovely to my European ears :)
I'd argue we are simply purchasing larger homes because that's what people want?