I think if you have suffiencent storage space, then you're okay. We have an 18 square house, 4 of that is garage. We don't really have anything here we don't use, and we're bursting at the seams. We have one double cupboard that was half shelved and half for brooms - we ended up shelving the entire thing just for some extra linen space. We don't have a lot of everything, but towels and things are bulky! Our kitchen is too small - no cupboards, just drawers, it looks great, but is useless for people like us who enjoy cooking and have a range of things for it. Our house doesn't look cluttered, but we do need the extra space because to get what I need from a cupboard, I need to pull everything out, find what I need, then put it all back. Our next house (we've already picked it) is 24 squares, with plenty of storage, and we believe it will be our "forever" house.

On your bigger bedroom idea, go for two double wardrobes. We had that in the house I grew up in and it was fantastic. Plenty of room for clothes on one side, and things like books, drawers, school bags, school stuff etc in the other side. Makes the bedrooms look large and open and not cluttered. My cousin did this and she even put in a power point in the wardrobe so her tv could go in there.