You are going to want more than 32" for the toilet. 36" is standard (and perhaps even code in some areas???? Not here in Maine but I heard people saying that on other forums...) We have 34" and it feels fine but I dont think I'd want to go much tighter. You could solve that simply by flipping the closet and shower. So, have your shower -rotated 90 degrees and witha glass end wall- at the end of the tub (which is a nice setup you can see in many bathrooms, the tub deck can actually protrude under the shower glass wall and be a ledge or seat in the shower). Then the passageway moves to the left, and you can steal a bit of space from the other closet for the toilet. Either that of have a shorter vanity. 48" isn't a size I'd fight for. It's too short for a double vanity, really (unless you're using one of the new two-faucet 'trough" styles) so why not go down to 42" and have a better toilet area? For resale, though, you should consider a double vanity. Some people I guess expert truly huge ones, like at least 5+' long. But you CAN get smaller ones, Ikea has some great ones for tight spaces. But if you're not selling anytime soon, do what YOU like!! (But I still think you'll want more toilet space...)

When you build with the WOW and 4k square feet, (which sounds like a lot but is not ) . It is NOT when you give starring role /NEARLY five hundred sq ft of it to a great room in front of the entry. Another couple hundred to a "hearth" area ......and what will happen here is nobody will actually gather in the great room, the fire will be the traffic stopper. Then you give each of three bedrooms a "walk in " closet. etc Result? you are left with the master suite that seems ( is) out of scale to the wow in the middle. Also small scale kid/guest bedrooms. The only answer to this plan is to lose a chunk of the "covered porch" square off the kitchen corner, bump the master suite to flush with the kitchen exterior wall.Change the window, to two on the covered porch wall and center the bed between. Plan to lose the tub for a decent shower too. Adjust bath and closet , center the entry to those with a right and left side for each. Anything else requires a total overhaul of the plan. That would mean a second story with two beds and baths on a second floor. ..........a completely different house. But this much under roof on one floor, with allocation to functions as is ? Yup......this is what you get Bump the master suite....or build something else.. ( square off that breakfast nook in any scenario.)

LisaMac- JuneKnow knows. What is that saying about throwing good money after bad? Not that your house is bad of course, it is perfectly fine as is, but just not for your current needs. It would be great for another family at a different stage of life. Do you think you can just hold on and do a serious search for a one-story home? Would you be willing to look outside your immediate neighborhood to find it? How aggressive would you be to look? If I were in your shoes now, I would drive around every single weekend and if you see a ranch house that looks to be the size you want, slip under the door and in the mail box index cards you had printed that says something like, "My husband and I really like your house! If you are thinking of selling your home, please contact us, we are interested in purchasing it to live in, please contact us. Sally and Joe Blow, Phone, email." Then you may get contacted by the owner or the real estate agent as these people decide to sell, or if they pass away. You can also contact a real estate agent that specializes in the geographic area you want and tell him/her that you need a one story home and specify the other things you need, e.g another full bathroom and bedroom not right next to the master but not at the other end of the house that will allow you to dress without awakening your husband. Or whatever it is that you want. For sure, you are not the only couple with different schedules, you may find what you are looking for. The other thing is, assuming you are willing to sell your house and buy another house that is all on one floor. Are you willing to compromise to get that one-floor house, such as less bedrooms? Even if grandchildren sleep over, you can use bunk beds, kids love those. Even bunk beds with trundle beds. If your husband needs a workshop you can have one added to the back yard with a big shed with electricity added to it unless you find that miracle of a three car garage. So you can do a three bedroom house instead of a 4. it is something to think about, because it seems the pros here have told you that you can't achieve the re-model you want with the money you have to spend on it. (One thing you should know, just because someone doesn't have PRO next to their name doesn't mean they aren't a professional. Some people prefer to be anonymous.)

Thank you everyone for the suggestions. Really appreciated. @Carrie B I don't want families, couples, or kids. I am targeting people in their late twenties/thirties with whom I have things in common. I am very selective. 99% are people visiting the universities for a few months or travel nurses. Currently, I have a Pediatrician (last year of residency), a lab technician, and a travel nurse. And I am % sure in Gainesville you do not need a permit if you live in the house and you are homestead, I asked the city. @palimpsest it is my house, I am renting rooms just for a few extra years. The closet can be smaller, I can extend the bathroom toward the closet. Having a 5'x8' or 5'x7' bathroom on that corner is not an option, it would ruin that beautiful room @Greg GN Builders., That is a good point, but I can enlarge toward the bottom of the drawing and move the sink to create space for the person to walk. @latifolia Below is the entire floorplan Going back to the original question. I want to figure out if I can get this 4th bathroom in a way that it will increase house price values and do not look weird. What is the minimum depth of the bathroom that you think would be enough? See below the full floor plan. As you see, on the top right, there is already a 34x34 shower in the previous master bathroom (the part on the bottom of the drawing is a 2008 addition the previous owner made, the part where I live). The upper two-third of the drawing is the old house (1959). No one complained about the 34x34 shower or small bathroom and everyone was happy to pay $1400 a month for that room. Questions again are: 1) can I make the wall (which separates room from bathroom) 2.5" thick by rotating 2x4 studs (so 1.5" stud + 2x0.5" drywalls) or just using 2x2s? That would bring the bathroom shower to 34x34. 2) Can I do a pocket door on a 2'5" wall? 3) With the same studs, I could bring the wall between the proposed bathroom and the room on its left down to 2'5". Which would bring the new bathroom up to 36" of depth. 4) If I need an even deeper bathroom, I could move the wall by 5" into the next room. As you see the window is off-centered by exactly 5" in that room, moving the wall by 5" would bring the depth of the bathroom to 39" or 41" depending on executing only (1) or also (2). Honestly, I would prefer not to move that wall, it is an extra cost. What do you guys think?