Multiple Floors Sandboxing
⚪ Last updated 2015⚠️ Install Order · 3 steps
Install in this order, then this mod last — most mods fail to load without their framework and dependencies in place.
Preview

🔍 Analysis
- 👍 5.5% endorsement rate — high engagement, a strong quality signal
- 🏆 #29 of 121 Gameplay mods in this game by downloads
📋 About This Mod
Do you have a nice custom home that has multiple floors in the same cell (i.e. no loading doors), and you want your NPCs to move up- and downstairs more?
This little tweak should address that need.
What does sandboxing mean? Sandboxing is just a term describing NPCs' auto behavior in a given location, like walking around, sitting down, drinking, eating, etc. Keep in mind that NPCs cannot roam outside of this location.
Why don't NPCs go up and down the floors in a cell (a single loaded area) with multiple floors? In Skyrim, NPC's sandboxing behaviors are defined to a specific location in 3d (a spherical shape). The global game settings GMST fSandboxCylinderTop and fSandboxCylinderBottom restricts that location to a more flat shape (imagine chopping the top and bottom of an orange off, so it's flat on top and bottom). The default value for fSandboxCylinderTop is 150 and fSandboxCylinderBottom -100, which is too flat for the NPC to notice things the floor above or below (a floor is 288 unit tall).
What this does: This is a little tweak to change the global game settings GMST fSandboxCylinderTop from 150 to 576, and fSandboxCylinderBottom from -100 to -576. As a result, the NPC can detect things (markers for various actions) roughly 2 floors above and below during their sandboxing behavior within their sandbox radius, so they will go up or down the floors to use those things (furnitures, markers, etc.).
P. S. I hope many of you will find the information helpful, but I also hope I have demonstrated in the little way that I can what my ideal modding community should be, one that shares files, knowledge, skills, and methods openly and selflessly with the sole intention of improving modding as a hobby without violating anyone's intellectual properties.
Requirements: None, just Skyrim the base game.
Compatibility: Should be compatible to everything.
How to Install: NMM: simply download with NMM and install it with NMM
Manual Install: simply extract sandboxcylinderheight.esp to Skyrim\Data
Load order doesn't matter. You can place it anywhere within your mod list, as I have yet know of any mods that make the same changes.
This plugin only makes small changes to the game setting. So it is entirely safe to add or remove this plugin at any point of the game. Disabling this plugin will not corrupt your playthroughs or saves.
This plugin will NOT impact game performance negatively.[/c
This gameplay tweak for Skyrim encourages NPCs to climb stairs and explore multiple floors within cells, addressing the common issue of NPCs staying on one level. With over 21,000 endorsements and 400,000 downloads, it's a popular, lightweight fix for more dynamic NPC behavior.
✨ Key Features
📊 Pros & Cons
✅ Pros
- Huge community trust (21,906 endorsements) — this is a must-have for immersion fans
- Simple tweak that fixes a noticeable AI quirk without overhauling the game
- Proven track record with 400k downloads — it works for a lot of players
⚠️ Cons
- Last updated in 2015 — may have compatibility issues with newer Skyrim versions or mods
- No detailed documentation on how it works or potential conflicts
- Only affects NPC pathing in multi-floor cells — not a major gameplay overhaul
For Skyrim players who notice NPCs stuck on one floor and want more lifelike exploration. Perfect for immersion-focused modlists. Skip if you're looking for combat or quest changes — this is a subtle AI fix.
💡 Beginner Tips
- Place this mod early in your load order to avoid conflicts with other AI mods
- Test in a city like Whiterun to see NPCs using stairs more often
- If you use a mod manager, let it handle the file placement to keep things clean
📊 Mod Details
- Game
- Skyrim LE Mods
- Author
- Dovahklon
- Version
- 1.0B
- Downloads
- 400,092
- Endorsements
- 21,906
- Category
- Gameplay
- Created
- 8/22/2014
- Updated
- 5/27/2015
🧩 Commonly Used Together
Users add these mods to the same collections — a real compatibility signal, not an AI guess.
🔧 How to Install Skyrim LE Mods
Download from Nexus.
📖 Full step-by-step install guide for Skyrim LE →
Visit the official mod page for specific installation instructions for this mod.
🎮 Need cheat codes or console commands? Check ur gaming wiki for Skyrim LE commands, item IDs, and more.
Keep browsing — more Skyrim LE mods await