Kids are sharing a bedroom and one of them is starting to mind.
The dining room is half storage. You haven't eaten an adult meal in your own dining room in months.
Your home office is half the living room couch.
You can't host. Not because you don't want to. Because there's genuinely no space.
The dog's "spot" is in the middle of the only walking path through the living room.
You're fighting with your spouse about stuff that never used to be fights, because the space pressure is real and it's affecting everybody.
This isn't a you problem. It's a square footage problem.