You put the sink in the required open space in front of the toilet. If Florida requires 16" either side of the midline, you need a space 32"wide for the full 24" in front of the toilet, with no obstructions. Unless the cabinet above the toilet is high enough to be unreachable, you can't put it there. You're trying to fit 10 pounds of flour in a 5 pound sack.

I don't see a corner in your closet, and it certainly isn't a walk-in.

Maybe something like this will make it possible.

This is a Florida clearance requirement from the 2020 Res building code I'm sure 2018 and 2015 would be the same. This hasn't changed in ages.

There is no way this will work with your dimensions.

The smallest comfortable full bathroom in my opinion is a 5ftx7 ft. What is on the other side of the closet wall? What is on the other side of the entrance door wall where the chair is? Maybe think about putting it by the entrance door instead where the chair is? OR can you go with just a powder room? No matter what it will leave you a very small master bedroom.

Youre interpreting spacing requirements entirely wrongly. You need much more space than you have to make a bath work. You can not have a toilet sink combo in the US, except in prison. The toilet is in the way of the required front clearance for the sink.

No one over the age of 12 is going to want to shower in a 32" X 32" shower. What is your motivation for wanting to do this?

Not to mention when using the bathroom the pocket door will have to remain open so the floor space in front of the bed can be used to negotiate through the shower door and then to towel off.

The bedroom has a desk and a chair that seem to take up a lot of space, but no dresser. Is that correct? Do you need/use the desk and the chair? You need room for a bed, and for getting around it, and, unless you have a dressing room, for closet/dresser(s), that's about it.

One possibility -- using standard 5 x 8 layout: As pointed out above, you need more space for bathroom, which means some furniture in bedroom will not fit. Also, it would be difficult to move furniture in/out of room due to tight entrance. It might be better for entrance to be 90-degree turn - i.e. to enter in direction of storage closet.

@Verbo, I am not sure what is not up to code based on your drawing. I can make the bathroom longer and steal some space from the closet if need be, but which code issue are you referring to? I can go also much smaller with the sink, this is only 7.3" deep: https://www.amazon.com/Gimify-Bathroom-Corner-Mount-Ceramic/dp/B07LFVRDRY

As for the 32"x32" shower, I had a 30"x30" shower all my life in Italy, never been an issue, I guess its cause we are all skinny. I appreciate bringing up concerns, if you think adding this bathroom to a 4 room 3 bathrooms house to make it a 4 bdr 4 bath is gonna decrease its value or turn off potential American buyers (I might sell in >5 years but nothing sure) I wont do it.

@mjlb, thanks for the suggestion but the room is beautiful the way it is, i don't wanna remove too much space.

Also, any suggestion on the wall thickness? Can i go 2.5" by rotating 2x4 studs?

Maybe try removing the closet and storage to get all the space available. I wonder if that can achieve a better layout? How much wall space is on the left of the window including the closet space?

Too tight to be usable. Maybe better off, to just put in a toilet and a sink.

Putting in a really uncomfortable bathroom is worse, IMO, than not having one ensuite. Unless you can steal square footage from an adjacent room, this is not really workable.

You can't fit 10 lbs in a 5 lb bag which is what you're trying to do.

I need to add a bathroom in a 10'10"x16' 5.5" bedroom to make it ensuite.

Why do you need to do this? Understanding the "why" may help answer the "how".

Well as of now I am renting 2 bedrooms on Airbnb (3 months and above only) and these 2 rooms are sharing one hallway bathroom. If I make one room ensuite, in my area I can charge for each $1400 per month rather than the $1000 I am charging now. I know it because I often just rent one room with a private hallway bathroom for $1400 and leave the other unrented just to have fewer people around ($1400 for 1 person better than 2000 for 2 people, but $2800 for two people is best). The bathroom will cost 10k so in 1 year I break even, I get a free bathroom and hopefully I increase the house value. I am in my thirties, I could maybe stop renting and moving in with my girlfriend (new relationship) in 1-2 years and have kids. I wanna make sure to do it in a way that it will look good. Bathrooms this size are not uncommon in Europe. Anyways, If I can make the wall 2.5" with 2x2 I can get a 34x34 shower. And if I need more leg space I can do it a little longer. What do you guys think?

LOL at that only costing 10K. The average remodel of a 3 piece bath that already exists is 22K. Yours doesn’t yet exist, and needs all the permitting, red tape for rental property permitting, and the basic build out of the infrastructure created. You'll be lucky if it only costs 50K. 70K would be closer to the mark as a start. If you can get a permit for it at all.

What you're describing is not a real bathroom and won't add value to your home.

Post a complete floorplan and maybe there will be other ideas. For example, might you combine the two bedrooms and bath into a master suite with walk-in closet and sitting area. That way you could rent to a couple, which might be less disruptive.

@Verbo what is "red tape for rental property permitting"? it is not a rental property. I live here, I have homestead. I can rent rooms if I live here, 100% sure I asked the city. I got a 15k quote from my contractor. That with tiles around the shower and waterproofing with "I forgot the name". He is trying to bring the price down to 11-12k using marble-looking acrilyic as shower's wall.

Make both rooms & the existing bathroom one listing. Put two small beds in one room as a family rental.

Re: red tape & permitting. Depending on where you're located, you *do* need a rental license to rent out a room in your home. I live in one of those cities.

If this is an AIr BnB does it really need a closet that size? I have stayed in some that have nothing more than a few hooks or a coat rack. How about something like this?

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

@GN Builders L.L.C, 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?

"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."

Then stop fighting for inches when it makes no difference. The answers to #1)-4) is maybe, no, no gain, not worth it. All no's or lean more to no's than yes'.

Room is still good size. Bathroom is normal. Maybe even an easier tie-in for an assumed sanitary line bustin up only the hall.

I have the bathroom that you are trying to design, more or less, for that room, and here they will allow 21" clearance with space under a wall hung sink to overlap partly into that space and they will allow toilets 15" on center and will even grandfather a 12" on center toilet because of the small size of older housing stock.

It ended up needing to be about 44" wide, or the room would have had to have been slightly T shaped to allow the sink area to abut into another space. I wanted it to work in 36" and it did not, and we are allowed tighter tolerances that you are. And the door (pocket) is never closed when the shower is used, even with good ventilation it somehow feels too confined. Even though it is ensuite, we use it like a powder room and are more comfortable using one of the other bathrooms in the house most of the time, because we have a choice.

If this were a short term rental like someone using it for a weekend or week, it would be one thing, but having that as your full bathroom for an entire semester or something like that, I don't know, if it's too small it's not going to be a pleasure to use. I have been through the micro bathroom thing in places like Manhattan, and sure it's better than nothing but if I had a choice of rooms in this situation, a room with a bathroom of that size is not the room I would pick first, and I am speaking from some experience.

@3onthetree, thank you. My bad, I just figured out that the farther edge of the window in the room I am trying to put a bathroom in is actually at 5' 7" from the wall, see updated cad below. I see it complicated to add the bathroom the way you described without having to move that window that is on an exterior concrete block wall.

But you don't live in the house: "I could maybe stop renting and moving in with my girlfriend".

Since you don't live in the house, it is illegal to discriminate based on age or familial status.

If I rented that space, I would not be happy with that bathroom. Especially for that price. Perhaps if I was there on business for only one night, maybe, and there were no hotel rooms available. If I was on vacation I would probably look for another room after the first night. Yes, just because of too small bathroom. I'd rather share a large bathroom. Even with a stranger.

@catbuilder. I live in the house every day of my life! I am typing from the master bedroom on the bottom of the cad drawing right now. I expressed myself badly, though, about "moving in", I apologize, I meant my girlfriend might move in with me and we might live forever in the house discussed in this topic, or I might sell the house (or rent it in full) and move in with her, god knows where, in the case the job market brings us somewhere else. Or I might break up with her god knows, it is a brand new relationship. As of now, the plan is to live forever here since my job is good but who knows. It is a 400k house with swimming pool, and I am spending 250k on improvements, which are: new kitchen with Miele appliances, renovating my master bathroom, tearing down the two walls in the drawing, built in cabinetry at two sides of the family room + electric fireplace, bifold door to the pool instead of the two old sliding door in the cad, hardwood floor everywhere (now carpet), smooth replastering/painting everywhere. And yes I will still rent after renovation because I love living with people I get along with, and rental income is helping a lot with the renovation cost.

Sorry Vex, you cannot see the forest for the trees. You want to spend all the human capital (time, money, heartache living through it) for a quickie 10ga bath in a 5ga space (3rd reference) because you see nothing but dollar signs. Yet you want it to be viable long-term for an actual house when it is not an Airbnb. Wasted capital and competing interests.

The existing window doesn't matter. You may note that for a shower it is smart to not have a window in it at all, however if you must it should be a transom window. So that means you can replace an existing window to a much smaller shape, and infill the rest. So for about $30 in CMU materials + stucco patch + the window you can make it, or many other presented real bath ideas alone or combined together, work.

I do understand though it's much easier to request professional and experienced advice, then cover your ears and eyes from it.

@3onthetree . I agree that I am trying to stretch it, that is why I am trying to look for advice, maybe I was missing a way to make it work. I appreciate your help.