Stall Builder is a Sweet Home 3D Furniture Library that contains all the parts you need to create any number of stalls: divider walls, doors, end wall mount, and extenders with panels for bigger stalls.
But first this:
It is an almost universal rule that stall doors open inwards. This poses a problem because the door needs space to open in an already cramped area. The most prominent reason for opening inwards is that it allows smaller bathrooms because an outward opening door needs floor space that could be used for sinks and people standing before the sinks. Of course it's also safer: an outward opening door can slam into people passing by the stall. You don't have that problem with inward opening doors. There's another not well known reason: inward opening doors can be fitted with special hinges that keep the door opened when not locked. This makes it easy to see which stalls are available to use.
Since the doors open inwards you should only use the small door (90cm) for 100cm and 120cm deep toilet stalls. There is not enough space inside the stall for a wider door because of the space a toilet occupies. If you create a toilet stall 90cm wide by 100cm deep you should place the toilet a little off the center to allow the door more opening space to step inside.
First determine what size stall you want to create and what type of stall feet you like. A public toilet or shower stall is usually the smallest, 90cm wide and 100cm deep. Changing, dressing, and fitting stalls are usually bigger. You can create stalls that are 90cm or 100cm wide and 100cm, 120cm, or 150cm deep.
THE WIDTH of the stall is determined by the door you choose: 90cm or 100cm. The actual door is smaller, the size corresponds to the stall width and the door object is created at the same width for easy alignment.
Stall doors have an indication in the name for the hinge they use: H0 indicates a non-opening door, H1-H9 have hinges 1 to 9. The static door H0 makes it easy to quickly create a large row of stalls using the Multiplier plugin but the doors will of course not open. If you don't intend to export the stalls as a single object you can use multiple H1 doors. They will open as long as they remain individual doors and are not exported together.
THE DEPTH of the stalls is determined by the divider you choose. You can choose between 100cm, 120cm, and 150cm deep dividers.