"The kind that you enter the bath from the bedroom, sinks in main area, pocket door to toilet and shower. " THIS kind, with a double sink, if there is room. We have it and enjoy it. The other kind, where you have to lock/unlock two doors every time you want to shower/potty is very obnoxious to me. My mom has one in her home, and I have shared that J&J with various relatives or guests. Nearly every time I have shared, someone forgets to unlock the door when they are done. Maybe it's different because guests aren't in the habit of doing that each time, but I find it annoying.

We currently have a similar jack and jill set up to what rmverb will have. The kids love it and it works really well. The guest bedroom upstairs has a doorway directly into the other upstairs bathroom. It has a small sink and then there's a door leading into the room with the shower and toilet. At the other end of that is another door with opens into a small room with a sink. That room opens into the hallway. That setup works really well right now and affords everyone some privacy while allowing hallway bathroom access. Our new house will be totally different though. The architect originally designed it so that the boys' bathroom was a hall bath. I said absolutely not because the bathroom would have a direct sight line to the guest bedroom and upstairs landing. I didn't want in the future to have two teen boys streaking down the hall and startling our frequent overnight guests. Our upstairs layout doesn't allow for a j&j though. We instead will have a boys' minisuite setup. Off the upstairs landing will be a barn door When you open it you'll see at either end the two boys' bedroom doors. In the middle will be the door to their shared bathroom and the door to the linen closet. I use the same sheets for their beds so having them share a closet for bedding and towels will be very convenient. The bathroom will have two sinks on a single counter. They're used to having their own so I think that will be best. At the end of a short hallway off the landing will be the door to the upstairs guest bath. It will have a walk-in shower, toilet and one sink. There will also be a door in the bathroom leading directly to the guest bedroom. Originally the architect had designated the boys' bathroom as the guest bathroom since it's right off the landing and didn't include door over their minisuite area. I insisted on the door for privacy. A friend of mine who has two older brothers told me that the architect was insane to designate that as the guest bath since the smell emanating from that bathroom once my older son reaches puberty will be enough to turn off guests. Once she told me that I asked him to add a hall door to the guest room bathroom.

Eh, you are building a custom home, and to me, these types of decisions are what make a home "custom!" I would absolutely use different finishes for each child's vanity. I imagine you aren't planning on moving in the near future, and even if you were...I don't think this is a situation that would cause people to not consider your house. It is a relatively easy fix to slap a new stone remnant on one of the tops if a buyer were so inclined.

I had this set up as a master in my first house. HATED IT - knocked down the dividing wall. That bathroom isn't that big - sectioning it further will make it seriously claustrophobic in the shower space. Having the shower and toilet in same room now means that when anyone is taking a shower, you have rendered your "powder room" function not usable. I divided my guest bath / powder room so that a sink / toilet is in one area, and a sink / shower is in another. That way, if I have guests, they can leave their stuff all over the counter in the shower room, and the function of the "hall bath" still is public, without the guest feeling like they are messing up the public area / we're rifling through their makeup / shaving kit. (My bath has access from both the hall and the guest room - so not sure that's possible for you - that space shown is, IMO, too small to ask it to do this many things.)