I never cease to be amazed at the sheer size of American houses, at least in some parts of the country. My niece’s house in Fort Worth is like that, I’ve seen smaller places over here that were open to the public ....
Mind you, building standards differ greatly. My garden shed is more robustly constructed than my neice’s house, and there is a running joke between my kids about “staying in flat pack houses in Florida”, the idea that a house built of 4x2 and plasterboard has a swimming pool amuses them greatly. Drywall is a lining, not a main construction technique.