Where do you store all your stuff that you dont ned every day? Or things that don't actually belong to the living area or a bedroom?

Things like:
computer
craft and sewing things
spare heaters and fans
sporting equipment
filing cabinet
christmas decorations

We have a 3bedroom home and being that DH and I share a room, and DD has her own room, we have one spare bedroom. The living room is quite small so the computer lives in the spare room. Plus everything else on that list! If we are to have another child we need to put those things elsewhere...but where?

We have no built in storage in any rooms bar the kitchen cupboards. I would dearly love built-in wardrobes in all the bedrooms because I think you get that extra bit of cupboard space up the top and I could store all sorts of crap up there!

So, do you have a smallish house and if so where do you keep all your stuff?