I think it is fine for a bedroom that size, kids like to be where you are anyway. I use to share a room not that much bigger with 2 siblings (bunk bed + single bed), it didn't worry us, we were always playing outside.
I'm guesing this house is to buy?
If so, if the bedrooms next to each other could you knock out the wall and rebuild it. We did this with our current house to make master bedroom a bit bigger for a wardrobe and took some space out of the study. Hubby is handy so did it himself but if it's not a load bearing wall it should be a realtively easy task. At most may cost you a couple of thousand for a tradie to do it if it's a straight forward case and is a small cost in the scheme of buying a house.
I think it's fine for now. Bedrooms are for sleep. If you've got space to store stuff (like the garage) then you don't need a massive amount of storage space and they can study elsewhere (like the 4th bedroom off the kitchen). And 20 yo's don't need a double bed in my opinion (they are shorter than a single anyway!), maybe a king single, but that would still fit in that room.
When you've been in the house for a while think about how you'd like to change it and consider your options. Move walls, extend a bit, etc. You're looking at $1000 - $3000 per square metre for building in general, but that won't be right if you're knocking down load bearing external walls, etc, it will be more. A 50cm extension to a single room would cost A LOT of money, but adding another 50cm to that wouldn't be so expensive.
If that's your only worry with the house then I'd buy it. But I'd probably go back & look at it again if I were you as it doesn't sound like you remember all the details exactly and this is a big decision.
One of our bedrooms is tiny at 2.7 x 2.3 and we have 2 boys in there. The set up we have is bunks with 2 huge storage draws under for lego etc and the top bunk has an ikea bookself on the wall above for storage and display. Then we have a chest of drawers in the cupboard for all the clothes and a hook rack on the wall for bags and towels. The set up is awesome for the space and there is a spare bedroom but not on the same level so the boys chose to be together in the smaller room. It looks very neat as everything has a place.
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