The 2 are in a box in the spare room just now but I have a dog cage in the garage that they can stay in under the brooder til they get too big for it.
Harmony/Eve - It is easier to take the hen's chick in when needed than put the other 2 under as she isn't that great at mothering. I have fostered day olds onto a broody before but decided against this time because it is so cold and she'd let a chick die already trying to follow another, then abandoned her one expecting it to follow her rather than stay and keep it warm. She's doing ok for it now in the wee coop but I'd rather she did that one well than risk the others outside now they're in and safe. I was planning to leave her with the 1 until she is bored, probably 5 weeks or so, then put it in the cage with the others until they're all able to cope outdoors. I might steal it from her earlier tho she won't like that at the moment!
Will see if they can still fit in it inside til 8 weeks thanks Eve. I had pols in that cage out on the back drive with a pallet and roofing tin extension last winter to cover them - that might be the answer for their transition as it will be more sheltered if a little dark - with extra board at the base as they're small enough to find gaps and it will be extra wind/rain shelter too yes, thanks MF.
Eve - yes indeed, I factor in broodies in summer but not my first thought in late October/early November when most are coming out of moult and not laying again yet - someone clearly was tho!