Updates:
I'm sure we're not the only ones who have wanted one! This is Project Spiral, a functional spiral staircase mod that uses animations when traveling between floors and does not use the elevator teleporting system. It's also base game compatible and easy to use, and sims will use it just like EA stairs and ladders after it's placed.
These stairs are objects though and do not auto-adjust their height to match the wall height, so only the shortest wall height is currently visually supported, but sims can still use the stairs to travel to the next floor without issue. A future update will have additional stair heights to choose from for the walls. Also, you can place as many down as you'd like, and the floor cutout auto-applies and moves with the spiral staircase wherever it goes, similar to EA stairs/ladders. You can also place stairs directly above each other on each floor and sims will route with them continuously when going to higher floors!

Please note that this is (Edit: now beta) testing, there will very likely be bugs (though we've done our best to fix everything) and that not all features are added! There shouldn't be any game breaking bugs though and you should be able to safely use this in your main saves.
Download and extract the files to your main mods folder or only one folder deep, as this is a script mod. Clear your localthumbcache before loading the game, instructions here if you are unfamiliar (you should always do this whenever adding or removing mods).
To uninstall, it's recommended to remove the stairs from your save first (to be safe) and then delete the files from your folder. Clear caches as usual after.
See the "Current Notes & Issues" down below for a list of what's not currently added, what to be aware of, and what is coming next before doing anything!
Once installed and in build mode you can either search by our names or "spiral", or "staircase", or go to the Appliances > Misc category to find the stairs and swatch of your choice, place it down where you'd like. That's it! The script and game handles the rest, even if you move it. If you delete the stairs though, you will need to delete the cutout manually. We will be looking into a way to remove the cutout after the stairs are deleted so you guys don't have to delete it yourselves.
If interested, please see the FAQ post (coming soon) to learn more details about the issues in the list.
LittleDica made the Industrial Spiral Staircase (included in the download)! The Radiant is converted from TS3, and more options and swatches will be coming at a later date as well!

Simplest thing to do is clone one of our spiral stairs, then import your meshes and textures as normal, keeping the general shape of the entrance/exit in line with the rig and cutout. As noted in the current issues, custom cutouts are not currently supported, but we will be looking into solutions for stairs that need a different cutout.
None, this is a fully custom mod and should not conflict with anything.
Major thanks to littledica for the Industrial Spiral Staircase object mesh, as well as lot51 for major help with scripting!
saturatedspark
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