PreventBuild

PreventBuild

A simple but flexible mod that prevents unwanted player actions described in the custom configs

by
759 Downloads
fabricutility
Rent Server with this Mod

About this Mod

logo

PreventBuild

Adds control to prevent the player from performing certain actions that are set in configs. Configs, in turn, have a very flexible structure that allows you to build complex logical conditions describing what actions the mod should prevent.

Original purpose of creating this mod was enhancing experience of hand-building map-arts without using any printers and easy-place mode. But now it's more than just preventing placing and breaking: you can prevent any right- or left-click actions, just make sure there is a suitable condition.

This mod is just cancelling the player's actions, so it's fully client-side.

How to use the mod

It's almost necessary to visit the Wiki to understand how to write a config, because there is no other way to write it except by hand.

There are a few files in config/preventbuild/:

  • conditions/ - contains config .cfg files
  • condition_configs.json - defines which configurations are active by its individual name
  • ore_dictionaries.json - defines custom ore dictionary lists for using in configs

Once you have created/updated your configs, you should update configs in the game using commands. Also configs are updating automatically when the player joins a world.

(For developers) Also you can find out how to create and register your own conditions that you will be able to use in the same config files.

Commands

  • /pb config list - display a list of configs with their status
  • /pb config switch - enable/disable config by name
  • /pb config update - reload all configs

Server restrictions of the conditions

Since I'm trying to keep gameplay fair and rules-friendly, I decided to give server owners the ability to restrict
some conditions that they can consider as "cheating-like" actions.

For now, there's only a few of such restrictions. To use them, you need to add the following strings to the plugin
message via the "preventbuild:restrictions" channel and send it to players on PlayerRegisterChannelEvent:

NoItemDamage - Disables all the "Item Damage" and "Item Durability" conditions

NoBlockState - Disables the "Block State" condition

NoAgeBlockState - Disables only the use of the "age" state in the "Block State" condition

ResetAll - Resets all restrictions

Example:

@EventHandler
public void onRegisterChannelJoin(PlayerRegisterChannelEvent event) {
	if (event.getChannel().equals("preventbuild:restrictions")) {
		Player player = event.getPlayer();
		ByteArrayDataOutput out = ByteStreams.newDataOutput();
		out.writeUTF("NoItemDamage NoAgeState");
		player.sendPluginMessage(this, event.getChannel(), out.toByteArray());
	}
}

Contacts

If you have some issues with the mod, any questions or just want to leave feedback, you are always welcome:

Note

Well, this is my first relatively serious mod and especially the first one for public use. Thanks for visiting :)

Available Versions

PreventBuild 1.4.5+mc1.21.9release
MC 1.21.9, 1.21.10, 1.21.11fabric
December 27, 2025
PreventBuild 1.4.5+mc1.21.6release
MC 1.21.5, 1.21.6, 1.21.7, 1.21.8fabric
December 27, 2025
PreventBuild 1.4.4+mc1.21.9release
MC 1.21.9, 1.21.10, 1.21.11fabric
October 31, 2025
PreventBuild 1.4.4+mc1.21.6release
MC 1.21.5, 1.21.6, 1.21.7, 1.21.8fabric
July 11, 2025
PreventBuild 1.3.5+mc1.21.6release
MC 1.21.5, 1.21.6, 1.21.7fabric
July 3, 2025

How to Install PreventBuild on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

3

Install Mod

Open the mod browser in the dashboard and search for "PreventBuild". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.11, 1.21.10, 1.21.9 (+5 more)

Server-side

Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

PreventBuild server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.

Is PreventBuild compatible with fabric?

PreventBuild officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.9. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with PreventBuild – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if PreventBuild consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install PreventBuild with just one click on your server.

Recommended RAM
4 GBab €8/mo
Min. 3 GB | +1 GB pro 8 Spieler
Create Server Now
1-Click Mod Install
NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Unsupported

Supported Versions

1.21.111.21.101.21.91.21.81.21.71.21.61.21.51.21.4