We are currently in the process of renovating our house and trying to figure out where the best placement of the Master bedroom/en-suite would be. It is a three floor house, all the bedrooms are on 1st and 2nd floors. There are currently 4 bedrooms on 1st floor and initially we planned to knock two of these through to create a Master bedroom with en-suite/WIW. This would leave 2 bedrooms on 1st floor, one which is a small nursery and one larger room. However we're now considering putting the Master on 2nd floor instead, and doing the same knock through to create an en-suite/WIW. This would leave one other room on 2nd floor which would be used as the study. Not a massive difference in general size of rooms except 2nd floor rooms have some sloping ceilings.
We currently have 2x young children and another on the way, so a current concern is having young kids sleeping on a different floor from us. They currently sleep on 1st floor (we all do) and they would continue to sleep on 1st floor even if we put our Master on 2nd floor (obviously baby would be in with us for first 6 months at least). If needed our eldest two could share a room for a while to keep them on 1st floor, but if our Master was on 1st at least one child would have to go upstairs by the age of 6/7 years.
We're also trying to future proof the house and think it might be better as they get older to have kids on 1st floor and us on 2nd, as opposed to the other way around? I'd love to know if anyone else had to make a similar decision or if parents of older kids had a preference either way!