How much HDD space does the game take?

[Pheex]

For some reason it doesn't say in the system specs on the store page. Searched but no dice

[Metacritical]

the download is 12.5GB, the installed file size is 24GB

[TheLostPenguin]

Note also that the save files are pretty chunky, which might be worth bearing in mind/managing if you need to think about HDD space.
My main save file is currently 527MB and I'd say that's still fairly small, if you keep a bunch of different saves around it would be very easy to fill up many GB more space just with save files.

[Pheex]

Fantastic, thank you both!

[✪Happy Dude✪]

1 billion GB

[mmmcheesywaffles]

That depends on the size of your HDD [or other storage medium]. Large HDD's have larger cluster sizes and some more space may get used up storing files using clusters that are larger than the files they are storing.

Even two apparently identical 2 Gig drives might have very different cluster size allocation. The smaller that cluster size the less space is 'wasted' when a file is not stored exactly in one cluster.

I'm not sure if Steam reaches the storage size based upon your actual cluster size on the target drive, or on some average based upon customers data across the customer base.

So the same game stored on 2 different machines might have several meg difference depending on the cluster size and the game's individual file sizes.

When trying to work this out you also need to consider that Windows generally needs a lot of 'breathing space' on a drive for file management. So if you have say 12% 'space' left on your drive and your game would make that free space only 10%; you might get away with it. But it is often recommended to keep free space to at LEAST 10% or bottlenecks might occur in Disk I/O that slows your machine to a crawl.

[Tsubame ⭐]

If you expect to use mods, expect to use a few GB as well, I have over 100 GB+ of mods stored.

[canophone]

There's the base game size. But also the savegame size. And then there's the model size if you use mods that use models.

At times, these latter two have caused me to have limited disk space.