Prefaced by NOMB, I would say the younger girls deserve some play space. Three girls in 12 x 11 is quite crowded, and means two must share a full or queen bottom bunk. The real solution is the eldest,, in her own room at night. if these siblings, were of male gender, it's not even an idea that would be contemplated or remotely desirable in any scenario.

Perhaps a night light, a soothing radio with the sound of the ocean, and a chat as to the delights of privacy? ! This fearful phase seems it would be outgrown very, very shortly, and is NOT something in which I would invest a furniture plan that crowds the younger girls, only to have the eldest announce she is ready for total privacy!!

How about instead, a grown up queen size bed for the 13 year old, new room scheme or bedding, and a sleepover with a close friend now and then, as a reward for being so grown up.. A bonus for you, as almost no decor will make both a five year old, and a thirteen year old, equally thrilled. Paint the wainscoting white, it needs nothing more. Have fun with the upper portion instead. Tailored to the younger two girls........with new privacy at the windows, on a well supported curtain rod, appropriately sized. : )

If you remove the toy and book shelves from this room, could you get 3 single beds in? This could be the sleeping room, and the other room the play room.

I wouldn't invest in new furniture since your 13 year old may change her mind quite soon.

What size bedroom does the 13 year old have. Is it larger than this one. What about switching, if it is larger. In the interim, I'd create the space for the other 2 girls, and make a rule that the 13 year old could only sleep in their room 3 or 4 times out of the week, and on the other days, she has to sleep in her own room.

I'd remove the wainscoting and paint the room one color.

What are the girls' interests? Are the colors pictured their favorite?

The premise is, how do I fit three girls in one bedroom?

If they need play space, there is a whole other bedroom for playing.

So, beds, I love creative bunks and I bet the girls will too. You can buy them or have them made. If you have access to a good carpenter, I'd have them custom made. How old are the other two girls?

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Remember Marcia, Jan and Cindy's room? It looks like there is room for another bed where the bookcase is.

Then, the bookcase and other pieces that aren't needed for sleep can go into the empty 'playroom.'

Here is a cool use of space for a bunk I found while searching for the Brady Bunch girls' room. I love how the bed is using the same space as the dresser and other bed.

I found some more (as you can tell, I love a well planned bunk!)

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We have 3 girls sharing one room, too (11x13), ages ranging from 5-9. The first thing I would do is get all of the books, toys, etc out of there. We have two double beds in the room (it is tight!), knowing that eventually one of the beds will go back to its own bedroom. A twin and a double would fit better, but I will not buy a new bed for this temporary setup. Their bedroom is for sleeping, we have nothing else in there (besides clothes). And then they use another bedroom for their toys, books, etc. I have a small couch in there for them for reading and hanging out. It works well for us for the time being.

I would work with the furniture you have, if possible. It is likely that one of them will want to branch off to their own room sometime soon. No guarantee, though.....my 19 year old niece still sleeps in the same room as her 7 year old sister (by choice). She uses her room for studying (she has a desk in there), hanging out with friends, etc.

I agree with Partim, a 13 YO girl would want her own room soon. If you can hold off the project for another year or so that will be the smartest move. If not, I saw many layout and furniture in the comments above - Chose your favorite :)

The smaller boxes next to the beds are meant to be under-the-bed storage boxes.

A great substitute for TVs and smartphones as a source of entertainment for kids is the best kids radio. Even though it's outdated, this is a great way to listen to music in a fun way while cutting down on screen time.