Map an interior and stream it in FiveM

Custom interiors turn a generic GTA building into YOUR space - a police station, a gang hideout, a player apartment. This lesson walks the full pipeline from CodeWalker to in-game, covering the file types that confuse every beginner and the exact fxmanifest lines that make it work.

You'll build: A custom MLO interior mapped with CodeWalker, exported as a FiveM resource, and streamed into your server.
Time: ~40 minutes
You need: CodeWalker (free GTA V mapping tool), a local FiveM server, and basic understanding of YMAP/YBN files.
You'll learn: What MLOs are, how YMAPs and YTYP files define interiors, using CodeWalker to place and export interiors, writing the correct fxmanifest, and streaming the interior in-game.

BEFORE YOU START

Build it

Create the interior in CodeWalker

Your YMAP and YTYP files are exported.

Open CodeWalker, load the GTA V world
Navigate to the building you want to map (e.g., an empty warehouse)
Use the object browser to place walls, floors, furniture, lighting
Once satisfied, Export → select both YMAP and YTYP formats

Export names must match. If your interior is called my_interior, you get:

code

my_interior.ymap
my_interior.ytyp

Create the resource structure

The FiveM resource is ready.

code

resources/my_interior/
fxmanifest.lua
stream/
my_interior.ymap
my_interior.ytyp
my_interior.ybn       <- any bound files
my_interior.ydd       <- any drawable dictionary
my_interior.ydr       <- any drawable model
my_interior.yft       <- any fragment model
my_interior.ytd       <- any texture dictionary

Write the fxmanifest

FiveM streams your interior.

code

fx_version 'cerulean'
game 'gta5'

description 'My Custom Interior'

files {
'stream/*.ymap',
'stream/*.ytyp',
'stream/*.ybn',
'stream/*.ydd',
'stream/*.ydr',
'stream/*.yft',
'stream/*.ytd',
}

data_file 'DLC_ITYP_REQUEST' 'stream/my_interior.ytyp'

this_is_a_map 'yes'

Critical lines:

files {} - lists every streamed asset
data_file 'DLC_ITYP_REQUEST' - loads the YTYP (archetype definitions)
this_is_a_map 'yes' - tells FiveM this resource adds map data

Verify placement and fix issues

The interior is correctly positioned with no gaps.

Join the server, go to the building, and check:

Do the walls appear inside the building shell?
Is the lighting correct (not too dark/bright)?
Can you walk through the space without falling through the floor?

Common fixes:

Floating objects: adjust Z position in CodeWalker and re-export
No collision: the YBN (bound) file is missing - add it to files {}
Missing textures: the YTD is missing - add it to files {}

Keep reading the full lesson

Still ahead in this lesson

Common failures