ModsFinder

CastleBlocks

by jusipat

Players building on a shared survival server use CastleBlocks to raise castle walls, doors and bricks that only the original builder can break.

FabricForgeNeoForgeClient and serverMIT LicenseOpen source1.16 – 1.21.1

What it does

CastleBlocks is a decoration and gameplay mod for Fabric, Forge and NeoForge. Its castle bricks can be broken only by the player who placed them, so a fortification stays standing against griefers and intruders without needing a chunk claiming mod. Breaking one takes a long time even with a diamond tool.

The mod adds lockable doors that open only for players holding the right keys, along with boulders and burning pitch buckets for defending a castle during PvP and PvE. A trowel identifies a castle brick's owner on right click. Several small aesthetic blocks, including a new candle variant, complete the set. The trowel recipe is shown in REI, and NEI and JEI support is available on Forge.

CastleBlocks needs to be installed on the server and on every player's client, since it runs on client and server. Its optional companion is Jade, which can display block information. The mod is open source under the MIT License and is published for 1.16 – 1.21.1 across 17 release versions. The latest NeoForge file is 1.0.14 for 1.21.1, and the latest Fabric file is 1.3.3 for 1.21.1.

Key features

  1. Owner-only castle bricks

    Castle bricks are hard for anyone except the original builder to break, which discourages tunneling into a base.

  2. Lockable doors

    A door system lets the owner grant access to specific players who hold the matching key.

  3. Siege items

    Boulders and burning pitch buckets give defenders tools to use during PvP and PvE fights.

  4. Trowel ownership check

    Right clicking a castle brick with a trowel reveals who owns it.

Compatibility

Latest build for each game version and loader.

1.21.x2 of 2 versions with builds
1.21.11.3.3Not available1.0.14
1.211.3.2Not available1.0.14
1.20.x5 of 5 versions with builds
1.20.41.3.1Not availableNot available
1.20.31.3.1Not availableNot available
1.20.21.3.1Not availableNot available
1.20.11.3.11.0.121.0.12
1.201.3.11.0.111.0.11
1.19.x1 of 1 version with builds
1.19.41.2.21.0.9.1Not available
1.18.x3 of 3 versions with builds
1.18.21.0.91.0.9Not available
1.18.11.0.9Not availableNot available
1.181.0.9Not availableNot available
1.16.x6 of 6 versions with builds
1.16.51.0.8.1Not availableNot available
1.16.41.0.8.1Not availableNot available
1.16.31.0.8.1Not availableNot available
1.16.21.0.8.1Not availableNot available
1.16.11.0.8.1Not availableNot available
1.161.0.8.1Not availableNot available
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Optional 1

Jade 🔍Shows information about what you are looking at. (Hwyla/Waila fork for Minecraft 1.16+)
Optional

Use cases

Survival servers

Groups on a shared server can build fortified bases without relying on a chunk claiming mod.

Build-focused PvP

Castles stay useful as defensive structures, not only as cosmetic builds.

Who it’s for: Server owners running survival or SMP worlds with PvP, and builders who want castles that other players cannot dismantle without the owner's permission.

How it compares

Full comparison

Brick Variety is a Fabric, Forge and NeoForge mod for client and server, with files for 1.16.5 – 26.2 and no open source code. Caleari Castle covers 1.20 – 26.3 on Fabric, Forge, NeoForge and Quilt, and is server required with the client optional. Bignay is open source under the GNU General Public License v3.0 only, published for 1.20 – 1.21.10 on Fabric, Forge and NeoForge.

ModLoadersGame versionsEnvironmentUpdated
CastleBlocksFabric, Forge and NeoForge1.16 – 1.21.1Client and server2026-06-24
Brick VarietyFabric, Forge and NeoForge1.16.5 – 26.2Client and server2026-08-31
Caleari CastleFabric, Forge, NeoForge and Quilt1.20 – 26.3Server required, client optional2026-09-27
BignayFabric, Forge and NeoForge1.20 – 1.21.10Client and server2026-10-15

Questions

Does CastleBlocks need to be installed on the server?

Yes. The server and every player need the mod installed.

Which loaders does CastleBlocks support?

It is published for Fabric, Forge and NeoForge. Older 1.16 and 1.18 builds are backports that lack some features of the main branch.

Is Jade required to use CastleBlocks?

No. Jade is an optional dependency that adds block information in game.

In the catalog

CastleBlocks is one of 12,078 Decoration mods on ModsFinder, and one of 6,982 Decoration mods for Fabric. 32,366 mods support Minecraft 1.21.1.

Decoration mods12,078Fabric modsMods for 1.21.132,366

More from jusipat

All projects
AstikorCarts Redux1.19.4 – 1.21.8No Dirt Warfare!1.18.2 – 1.20.1

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[ETF] Entity Texture Features1.16.5 – 26.3Not Enough Animations1.16.5 – 26.3Continuity1.17.1 – 26.3LambDynamicLights - Dynamic Lights1.16.2 – 26.3Presence Footsteps1.7.10 – 26.3AmbientSounds1.12.2 – 26.3

What the author says

Want to support me? Buy me a tea! - Introduces bricks which only the owner can easily break, this has many PvP applications. - Introduces boulders for use in PvP or PvE defending your castle! (Fabric & Forge 1.20+) #### Fabric Only Features - Introduces a lockable door system that allows only certain players with…
jusipat, on the Modrinth page

Official listing

Owner
jusipat
Published
2023-10-09
Updated on Modrinth
2026-06-24
Facts verified
2026-10-15

Tags

DecorationGame mechanicsUtilityAdventure
Open on ModrinthCompare