Signs you might have out-grown your current home:
If there's a box of old lanterns next to your toilet.
If the big bag of dog food is in the living room.
If the dining room table is used to hold food-between meals.
If the bookshelves hold books...and flashlights...and a menorah...and tools....a stapler...a pipe....
If the oven is used for storage, as well as cooking.
If the fireplace begins to look like an option for someplace to put your shoes.
If you think the term "counter-space" is a new physics theory.