DH and I are having a disagreement atm.
We have three dc, ds's aged 7 and 5 and dd aged 2. We're currently in a two bedroom house, and the dc share the largest room. Ds1 and ds2 have bunk beds, and dd has a toddler bed.
Dd is very big for 2 and has pretty much outgrown the toddler bed, so we need to now move her up to a 'standard' sized bed.
A standard single will take up a lot more space than her tiny toddler bed. The ds's bunks are in a kind of alcove in the room, meaning they fit in and then there is about 4 foot of space before the room 'begins' iyswim.
Rather than getting dd a single bed and taking up space that could otherwise be used by them, i would like to get bunk beds with a single on top and a double on the bottom. They would still fit into the alcove meaning no bedroom space would be lost (and with the toddler bed being removed would actually be gaining space). Due to dd's age I wouldn't want her on the top, so it would be ds1 (7) on top and ds2 (5) and dd (2) sharing the double.
I will add that this will only be for a maximum of two years. We have an investment maturing in December 2015 and will then be buying a bigger house, 3 bed min, so the dc will probably all have their own rooms.
DH thinks it's an awful idea, that a child should have their own bed, particularly as it would be girl/boy sharing. He's embarrassed about people 'finding out' that they share a bed and thinking we're poor/neglectful in not giving them their own beds 
For me, I think the additional space in the bedroom will be more than worth it. At ages 5 and 2 (up until ages 7 and 4) I think it's fine for them to share as they're not of an age where they need 'privacy' as such - obviously if they were 15 and 12 I wouldn't consider it! Often I wake to find that dd has squeezed into bed with ds2 during the night anyway, and I think they'd actually be thrilled with the idea.
AIBU?