Huge kitchen or extra box room?

[StiffLittleFingers]

Please help me plan my extension - we can extend our two bed garden flat and have two options: a huge (dream) kitchen with lots of work surface and room for 6 seater table. Keep our 2 double bedrooms
OR
A smaller kitchen (4m squared) with room for table but far less units. Then an added 3rd single room which could be used as study/guest room. Its windows would look out onto the side return so I think it'd be too gloomy for a proper bedroom.

We have 2 girls who are just tots so I'd be interested to hear how people think might we appreciate either space as they grow older.
No option to move house yet for financial reasons, want to stay here for great school catchments. Unfortunately no scope to add a 2nd toilet!
Do I go for the dream eat in kitchen where I envisage the girls having loads of room to do their homework or the more practical extra room?!

meadowquark, the kitchen with the extra bedroom would be 4m x 4m which is not 4sqm but 16 sq m.

4sqm is the size of my kitchen and just slightly smaller than StiffLittleFingers' kitchen at 2mx2m5 (i.e. 5sqm).

Thanks for clarifying IssyStark. It seems most vote in favour of a big family kitchen/playroom. I fear I'm misselling the 3rd room though - it's a decent single bedroom size rather than a boxroom, but it'd have two small frosted windows into a ground floor side return, which I think is a bit depressing for a bedroom (even for a goth teenager)

Big kitchen with a play 'zone' in one corner. Attractive to future buyers and you'll have moved by the time your girls really need their own rooms.

go for big kitchen. If you have one large and one small bedroom for the girls how are you going to decide who should have the bigger, nicer room? Big kitchen every time!

Big kitchen, but zone it so there's a play space with storage for toys etc. In time, think about sticking a sofa in there so it becomes an extra hang out space.

The one thing that is really hard to get your head round when you are surrounded by the plastic tat of toddlerhood is how little stuff teenagers really have. My DS is 9 now and X box and outside stuff is all he really plays with (although he did get ALL the playmobile back out just before Christmas because he sensed I wanted to sell it, he's smart that one).

A place for homework/music docking/watching YouTube etc will become more important as your girls grow.

Oh and if you're selling soon-ish the dream kitchen will always sell a house.

Also I hate unused space!

Meadowquark 4m x 4m isn't "unacceptably small" - its all relative to the size of a house!

Kitchen easily! With great kitchen size comes great amounts of storage and living space as lets face it if we all have a large kitchen, we'll probably do the majority of our activities in it.

The 3rd room would without doubt end up being the dumping ground for old toys and whatever else finds its way in there.

Kitchen for me every time