I only have 2 children, a 14 yo girl & 17 yo boy...and we have 3 bedrooms & a playroom upstairs (master is down.) My son's room has its own bath, but we actually added another door so it also opens to the playroom. So glad we did this! Our daughter has a Jack & Jill with the guest room. She has her own very large vanity with a sink and drop down counter area where she can sit & apply makeup. Her large, walk-in closet in is this dressing area as well. There is a door to the shared toilet/tub area, which of course connects to the vanity area of the guest room. The guest room vanity is much smaller, a single, and the guest room closet is just a small walkin in the actual guest room, not the vanity area. If we had 2 teen girls sharing this set up, the one in the guest room would definitely get the short stick! Since we custom designed our plan & knew we were only going to have the 2 children, our set up works just fine. Dd was 8 when we built, and we knew the teen years were coming. Teen girls just have so much crap! Personally, if I were you...I'd make the two older ones involved in the process. I bet they would prefer sharing a J&J to having a hall bath. Make sure they understand you are not getting involved in any fights & that they have to figure out a system. It will be good practice for college where many dorms have this type of set up now. The little ones can have the hall...and when your littlest dd becomes a teen, the other girls will be adults & she can have the J&J to herself!

It's so simple! When there's a bathroom designed for use by more than one person, just think about how frustrating it will be if all of the facilities are behind one lockable door. First person in locks the door and no one else can access the facilities! If these are small up through adolescent children, think how long they remain in the bathroom looking at themselves in the mirror, using all the hot water and leaving a mountain of mess behind them when they eventually depart, sometime before day's end! What's the solution? It's so simple! Design the bathroom in a segregated fashion so that private usage (toilet and bathing) are behind one door. Better yet, behind two doors! Provide multiple lavatories and storage in another accessible space! Ta-dah! Everyone can use at least part of the bathroom at the same time! It's so simple!

See I think a J&J is ok in lots of situations. We have one child who has a J&J bathroom. It is nice that he has access without going in the hallway - and it gives the occasional guest access to that bathroom. We do have another guest room so the vast majority of the time, the Jill portion is unused. Obviously we don't really need that 4th bedroom but resale.... We could cut the other bath and just have 1 hall bath upstairs, but then guests are using a hall bath and sharing with my son. That wasn't considered ideal. So we are building our second J&J. It could be a hall bath with access to his room but layout dictated a J&J. Harder to have a hall bath with a window also.

This plan is not tiny. Nor even little, that's for sure. But your needs don't seem to be tiny or little, either. They are quite a bit more than basic, especially by the time you get into wall ovens, master baths with two sinks, a tub and a shower, and craft spaces. I do like much about your plan, but it's all theoretical. ALL may have to change once you get your lot. Suppose access to the lot is from the south, and your garage will end up on the sunny side? Your big rooms will face north! Suppose water runoff means you can't build a square house? So, consider this not even as a draft, but as a wish list. Find yourself a lot. Do all kinds of reading on different ways to build, how much things cost relative to each other (like the example above on complicated roof lines). Will the house be netZero or high-efficiency, or solar, or..... These features have to be accommodated in the floor plan and construction budget.... You really want breeze on your head while you're sleeping? That seems very odd to me. Read up on universal design. Even little things matter, like the height of the light switches, lever handles, C-shaped cabinet pulls, location of the microwave, door widths, window choices, etc. You can install a ramp to the front door, but different levels inside or a lot of corners and tight spaces to navigate...NO. All of these things are part of home-design, not after-thoughts.