Medieval Engineers server hosting for your builders
Build castles, siege engines and working machines together on a server that stays online. Run Keen’s official dedicated server with Workshop mods and your own world, or the Community Edition branch that volunteers keep improving.
- Official dedicated server (SteamCMD app 367970)
- Steam Workshop mods loaded by ID
- Bring your own world from your PC
- Admins by Steam ID and Steam group access
- PlayersThe maxPlayers start option overrides the player limit of the config file.
- Set with maxPlayers
- PortsThe game port is changeable; every instance on one address needs its own game and Remote API port.
- 27016 UDP · 8080 TCP (Remote API)
- Config
- MedievalEngineers-Dedicated.cfg
- Mods
- Steam Workshop
- Branches
- public and communityedition
- Server software
- Windows, .NET 4.6.1 or newer
Options
- Steam Workshop
- Community Edition
- World upload
- Steam group
- Remote API
Game facts from Keen Software House’s official dedicated server guide, SteamCMD data and the game’s Steam news, checked in October 2026.
- DDoS protection
- 20 game server locations
Medieval Engineers plans are being prepared
Tell us your player count, your mods and whether you play the Community Edition, and our team will reply with the options. Or open a ticket and we will let you know when the plans are online.
How much RAM does a Medieval Engineers server need?
Physics drives the load: every block, mechanism and siege engine your players build has to be simulated. Large castles and many mods need more.
Find your size
| Feature |
Small group
Up to 6 players
|
Recommended Community
Up to 16 players
|
Large
Up to 32 players
|
|---|---|---|---|
| Memory (RAM)Working memory for the world, the players and every mod. Leave headroom: memory use grows as players explore. | 4 GB | 8 GB | 12 GB+ |
| CPU coresPhysics runs mostly on one main thread, so fast cores keep big builds smooth. | 2 | 3–4 | 4+ |
| Disk spaceRoom for the game files, the world and its backups, plus updates and mods. | 20 GB | 25 GB | 30 GB |
| BuildsMoving parts such as gears, catapults and trebuchets cost far more simulation time than static walls. | Villages and houses | Castles and machines | Large sieges |
| Typical use | Friends building together | A community with Workshop mods | A busy server with big castles |
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Small group
Up to 6 players
- Memory (RAM)Working memory for the world, the players and every mod. Leave headroom: memory use grows as players explore.
- 4 GB
- CPU coresPhysics runs mostly on one main thread, so fast cores keep big builds smooth.
- 2
- Disk spaceRoom for the game files, the world and its backups, plus updates and mods.
- 20 GB
- BuildsMoving parts such as gears, catapults and trebuchets cost far more simulation time than static walls.
- Villages and houses
- Typical use
- Friends building together
-
Recommended
Community
Up to 16 players
- Memory (RAM)Working memory for the world, the players and every mod. Leave headroom: memory use grows as players explore.
- 8 GB
- CPU coresPhysics runs mostly on one main thread, so fast cores keep big builds smooth.
- 3–4
- Disk spaceRoom for the game files, the world and its backups, plus updates and mods.
- 25 GB
- BuildsMoving parts such as gears, catapults and trebuchets cost far more simulation time than static walls.
- Castles and machines
- Typical use
- A community with Workshop mods
-
Large
Up to 32 players
- Memory (RAM)Working memory for the world, the players and every mod. Leave headroom: memory use grows as players explore.
- 12 GB+
- CPU coresPhysics runs mostly on one main thread, so fast cores keep big builds smooth.
- 4+
- Disk spaceRoom for the game files, the world and its backups, plus updates and mods.
- 30 GB
- BuildsMoving parts such as gears, catapults and trebuchets cost far more simulation time than static walls.
- Large sieges
- Typical use
- A busy server with big castles
Keen publishes no server hardware figures; these starting points follow common practice. Physics-heavy builds and many Workshop mods can double the need.
Workshop, worlds and access
Everything is set in one config file, from the world you load to the mods and admins.
Steam Workshop
Enter Workshop mod IDs, one per line; the server loads them and players get them when they join.
Your own world
Copy a save from %AppData%\MedievalEngineers on your PC to the server and point LoadWorld at it.
Admins and Steam group
List admins by 64-bit Steam ID, one per line; a Steam group ID limits the server to that group.
Community Edition
Keen ended development in March 2020; volunteers continue the game as the Community Edition, a beta branch the server can run too.
Remote API
A key-protected Remote API on port 8080 lets tools manage the server remotely.
Start options
console, noconsole, path, ignorelastsession, maxPlayers, ip and port control how the server starts.
Set up your Medieval Engineers server
Four steps from an empty field to your first castle.
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Choose a branch and size
Pick the public or Community Edition branch to match your players, then a size from the table above.
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Pick a location
Choose the one closest to your players from our 20 game server locations.
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Load world and mods
Upload your save or start a new world, add Workshop mod IDs and your admins’ Steam IDs.
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Invite your players
Players join from the server list or by address and port.
Other game servers you might like
Stormworks: Build and Rescue
Build and rescue together with up to 32 players and Workshop addons.
Learn moreFrequently asked questions
Which port does the server use?
UDP 27016 for the game by default; you can change it. The Remote API uses port 8080 by default. Every instance on the same address needs its own ports.
How do I set the player limit?
Set it in the server’s config or with the maxPlayers start option, which overrides the config value. Physics-heavy worlds need more CPU as player numbers grow.
Can I bring my existing world?
Yes. Your saves are in %AppData%\MedievalEngineers on your PC. Copy the save folder to the server and set LoadWorld in MedievalEngineers-Dedicated.cfg to its full path.
How do I add Workshop mods?
Enter the Workshop mod IDs in the server config, one per line, and restart. Players download the mods when they join.
How do I add admins?
List their 64-bit Steam IDs, not their names, one per line under the server admins. Admins can kick and ban players.
Can I keep the server for my Steam group?
Yes. Enter your Steam group ID and only its members see the server. You find the ID as groupID64 on the group’s members list XML page.
What is the Community Edition?
Keen Software House ended development of Medieval Engineers in March 2020. Volunteers, with Keen’s support, continue it as the Community Edition, a beta branch on Steam; version 0.7.4 came out in December 2024. Run the server on the same branch as your players.
Does the server run on Linux?
The official server is a Windows program and needs .NET Framework 4.6.1 or newer.
How do I stop the server without losing progress?
Stop it normally so it saves first. Forcing it to close skips the save; ignorelastsession at start ignores the last automatic save if you need an older one.
Ready to raise your castle?
Tell us your players, branch and mods, and we will help you pick the right Medieval Engineers server.