Our house is 792 square feet... we have one toddler, 2 adults, another baby on the way, two large dogs, and one cat living here. I would like a well organized house at least twice the size of what we have... I'd like: a large walk-in pantry, a cold room, closets (there are only two closets in our entire house, no coat closets or linen closets), a basement (we just have a crawl space), a play room to keep kid's toys in so our living room doesn't look like a toy store threw up, a kitchen with more than 2 cupboards, a dining room table that our family can sit and eat a real dinner on.... I want STORAGE for SS gadgets and organization, and I really want a dedicated room for me to draw my portraits in.
Sure, I don't NEED all those things, but they would make me happier than I am in this house... I don't need a mansion, I'd just like at least 1500 well-laid out square feet.
Our house was built in 1883 as a rooming house for men working at a sawmill close by so it's just a box with teeny, tiny rooms... the largest room in our house is 10x12 feet, the smallest bedroom is 5x8, and I would love to have more room than that in any given room... there's no room to take more than one step in any direction before you hit a wall or furniture or a dog or a child's toy. The foot print is 16x22, and it's a story and a half which makes upstairs feel much smaller.
We stay because it's paid off, but we're trying to fix it up so that we can sell it for a profit and use that to buy a house with enough land for animals and more room for small children to run and play inside.
I go crazy in the house all winter, but I don't mind it so much during the summer because I love our yard, my raised beds, the fruit trees, the berries, and there's always stuff to do outside during the summer, I just feel trapped during the winter.
Everything we own has use, nothing strictly for looks. I can't keep this clean half the time, why would I want more?! 
I'm too busy for a bigger house. 
