Tips on ideal house for teenagers

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We have a family of six in a three bed house. We are having an architect help rejig the house to make it a four bed, but in the process I want to make it a house that will work for the next 15 years until the youngest have finished A levels.
My oldest is only 9 now so I struggle to imagine what life will be like, and this is my chance to get things right.

What do I need to think about?
What should I prioritise?

If you have teens what do you really appreciate having in your home set up?
What do you really wish you could change?

Many thanks.

DD2 seriously suggested turning the cupboard under the stairs into a bedroom for her at one point.

We keep coats and shoes in bedrooms tbh, with just one coat each in the cupboard under the stairs.

How many are there in your household, Ruby? That small room would make a really good cloaks cupboard, but if you all are quite tidy everyone would be able to store their coats and shoes in their bedrooms and the small room could be a sitting area. Try it the way you want it but alter it to the other function if it doesn't work. Where else would you put the ironing board, hoover and general crap if not in that room?

This might just be me & my experience - but I wouldn't want bedrooms away from the rest of the family. When I was 12 we moved into a 3 storey house & I got the bedroom on the top floor while the rest of the family (parents & 2 brothers) were on the 2nd floor. I had my own bathroom up there too. In retrospect I think it was a bit distancing, although at the time of course I wanted that to be my room!

We haven't found seperate sitting rooms to be much used, currently all 3 of mine at home are in with me, though DH is still in his study. As many bathrooms and loos as possible, we. Have 3 loos, 3 showers for 6. Yes to as much fridge space as possible, and freezer space. Mine are lucky enough to have their own room each, but clever planning in rooms could make that less of a problem, and it is only in the part 3/4 years ( dc are 19, 18, 15 and 12) that all their bedrooms have been used as they like to shre.

ruby I would try the small room as storage and see if it works.
Just get a coat rack you can move to start.
I had a utility/storage room in my last house and it was great, it house coats/shoes/sports gear/ironing board/clothes airer, DIY gear/craft stuff/recycling.
It meant it was so much easier to keep the rest of the house clearer.
I don't have that now and the house is a constant mess.

We have a shower cubicle in a nook off one bedroom ( with a normal door outside the shower door so it's hidden).
I would also look at trying to get 5 small bedrooms rather than 4 if poss.