The Sims 4 has one of the largest modding communities in gaming. From realistic gameplay overhauls to custom hairstyles, houses, and entire story expansions — mods completely transform the experience.

If you're new to modding or just need a clear refresher, this step-by-step guide will show you exactly how to install:

• Script mods

• Custom content (CC)

• Houses & lots

• Custom Sims

• Tray files

• Mod updates

Everything explained in a simple and safe way.

Before You Start: Enable Mods in The Sims 4

Before installing anything, you must enable mod support inside the game.

1. Launch The Sims 4

2. Go to Game Options

3. Open the Other tab

4. Check:

   • ✔ Enable Custom Content and Mods

   • ✔ Script Mods Allowed

5. Click Apply Changes

6. Restart the game

Without this step, mods will not work.

Where to Put Mods in The Sims 4

All mods must be placed inside the official Mods folder:

⚠ Never install mods inside the Program Files game directory.
Always use the Documents folder.

How to Install Custom Content (CC)

Custom content includes:

• Hairstyles

• Clothes

• Furniture

• Skins

• Makeup

• Build objects

These usually come in .package files.

Installation Steps:

1. Download the mod file

2. Extract it if it's in a .zip or .rar archive

3. Place the .package file into:

You can create subfolders (for example: Hairstyles, Furniture, Build Mode), but:

⚠ Script mods should NOT be placed more than one folder deep.

Example:
✔ Mods/Hairstyles/file.package
❌ Mods/Folder1/Folder2/file.package (may not load correctly)

How to Install Script Mods

Script mods change gameplay mechanics and usually include:

• .ts4script files

• .package files

• Sometimes both

Examples:

• Gameplay overhauls

• Relationship systems

• Career mods

• UI mods

Installation:

1. Extract the archive

2. Place all included files directly into:

⚠ Important:

• Do NOT unzip .ts4script files separately

• Do NOT rename script files

• Keep them no deeper than one subfolder

How to Install Houses & Lots

Houses and community lots use Tray files, not regular mod files.

They usually come with several files like:

• .trayitem

• .blueprint

• .bpi

• .room

Installation:

1. Extract the downloaded archive

2. Copy ALL included files into:

3. Launch the game

4. Open the Gallery

5. Go to My Library

6. Enable:
   ✔ Include Custom Content

Your lot should now appear.

How to Install Custom Sims

Custom Sims are also Tray files.

Installation is exactly the same as lots:

1. Extract files

2. Place them into the Tray folder

3. Enable “Include Custom Content” in Gallery

After that, you can place the Sim into your household.

How to Update Mods After a Game Patch

The Sims 4 updates frequently — and updates can break mods.

When a patch releases:

1. Disable mods in Game Options

2. Move your Mods folder to desktop

3. Launch the game once (to generate fresh files)

4. Check mod creators for updates

5. Replace outdated files

6. Re-enable mods

Never keep outdated script mods after a major patch — they can corrupt saves.

How to Organize Your Mods Folder

If you use many mods, organization becomes essential.

Recommended structure:

This makes troubleshooting much easier.

How to Fix Mods Not Showing Up

If your mods don't appear:

✔ Make sure mods are enabled in settings
✔ Check that files are inside the correct folder
✔ Make sure files are extracted
✔ Check for duplicates
✔ Clear cache (delete localthumbcache.package)
✔ Make sure script mods are only one folder deep

The file you can safely delete:

The game will regenerate it.

Are Mods Safe?

Mods are generally safe if:

• Downloaded from trusted sources

• Scanned with antivirus

• Updated regularly

Avoid:

• Suspicious executable (.exe) files

• Fake “installers”

• Files outside .package or .ts4script format

The Sims 4 mods never require external installers.

Backup Your Saves (Highly Recommended)

Before installing large gameplay mods:

1. Go to:

2. Copy the entire folder

3. Store it somewhere safe

If something breaks, you can restore your progress.

Final Tips for Smooth Modding

• Install mods gradually

• Test the game after adding new mods

• Keep gameplay mods separate from cosmetic CC

• Remove broken or outdated files regularly

• Follow creator update notes after patches

Conclusion

Installing mods in The Sims 4 is simple once you understand where files go. Whether you're adding realistic gameplay systems, beautiful custom homes, or unique Sims — the process always follows the same structure:

• Mods → Mods folder

• Lots & Sims → Tray folder

• Enable mods in settings

With proper organization and regular updates, you can enjoy a fully customized Sims 4 experience without issues.