Children's' bedrooms in separate wing of house?

[Nigatsudo]

Hello! We are looking to buy a house out of London. I'm expecting twins (my first pregnancy) and we want more space and proximity to countryside. We've found a very characterful period house that has 4 bedrooms but they're split between two separate wings each with own staircase that on the ground floor are divided by several rooms. We don't know the sex of the babies yet but if they're same sex was imagining they might share til 8yrs or so. If bg then we'd separate sooner. I'd welcome your thoughts on when you'd think children would be mature enough to have their own wing. I was thinking adolescence- maybe 12/13? Obviously a lot depends on their feelings and development. Ideally they'd both go to the second wing rather than one on their own. I wouldn't want to be that far away from them as even older children 8-11yrs) as we wouldn't be able to hear them and it would be a long distance to walk to us. Thanks for all thoughts in advance!

To be honest the house sounds a bit impractical for the stage of life you’re in if you’re not wanting children to be in a separate wing from you.
I agree that it would be hard to get to your child if one of them was far away. You could obviously keep a baby monitor in their room so you could hear if they were upset, but I guess it depends whether you then want to be walking through the house to comfort them multiple times. Or you’d end up one of you sleeping in one wing with one kid and the other sleeping in the other wing with a kid when they’re struggling to sleep / scared / refusing to go to bed etc.
Also, the thought of teenagers having a separate wing would terrify me! I’ve worked with enough teens to know that given the chance many of them would take the opportunity of their parents being nowhere near them in the house to get up to all sorts. Though to be fair, some parents may prefer it!
Is there no way to create some kind of
hallway to joint the two upstairs areas?

Without really seeing the house it’s difficult to picture and imagine however our home was originally a bungalow which has been extended and another floor added. Master (our bedroom) is on ground floor with the two kids bedrooms upstairs. I worried about this before they were born but actually it is completely fine. We have safety measures in place that we probably wouldn’t have if we were all on the same floor such as alarms on all windows including break glass alarms, stair gates on bedroom doors (only on our youngest door). And we still use a baby monitor on our 4 year old. She knows if she needs us through the night to just call on us and we will come to her instead of trying to navigate the stairs half asleep. We also are very diligent with fire safety and have fire alarms everywhere and fire doors in the hall and I have a fire plan in my head for emergencies which me and DH have spoke about (although this is probably more to do with my job as an ICU nurse in a national burns hospital, than bedroom locations!! And actually off topic I would recommend everybody to have an escape plan for every room in the house!). It’s really has never been an issue for us.

Our kiddo is 2 floors away from us (early primary age) and has been since she was a baby. It’s been fine, but she’s a great sleeper so we only rarely have to go downstairs. It was incredibly irritating when we had a few weeks where she kept leaving her room in the middle of the night. Like PP we use a sound baby monitor in the hallway so DC doesn’t have to come all the way up if she needs something.

Without knowing the layout of the house exactly, it doesn’t sound like it’d be a huge deal. But you also don’t know what kind of kids you’re going to get. Our DC was already a great sleeper when we bought our house and is not clingy at all.