Biome Builder
Biome Builder lets players create Minecraft's own biomes and structures wherever they choose by placing a set of anchor blocks.
What it does
Biome Builder adds two kinds of block, Biome Anchors and Structure Anchors. Placing an anchor in a chunk and activating it turns that area into the chosen biome or structure, in a style inspired by Terraria's mechanic of placing a set number of specific blocks to mark an area. Each anchor reaches 12 blocks above and below its position, and that vertical range can be configured for structures.
Some biomes need a minimum or maximum elevation, and Structure Anchors add a further requirement: at least three directly adjacent chunks to the north, east, south and west must contain the biome the structure needs. A chunk can hold more than two biomes, but only the biome center block at 8 counts for detection. Certain biomes and structures also become available for crafting higher-tier anchors, and the author's config document gives a detailed guide to the settings.
Ocean Monuments, for example, can be built so that Guardians spawn in them, and Nether Fortresses can be set to spawn Blazes and Wither Skeletons. Activated Structure Anchors and their range are configurable.
Key features
Biome Anchors
Placed anchors turn a chunk into a chosen Minecraft biome, so biomes can appear wherever a player wants them.
Structure Anchors
Structure Anchors create Minecraft structures and work like biome anchors, with the extra adjacency requirement.
Configurable vertical range
Anchors reach 12 blocks above and below their position, and the structure vertical range can be set in the config.
Visible anchor chunks
The chunk an anchor is placed in can be shown by pressing F3 + G, which helps players check their placement.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Custom biome builds
Players lay out biomes in a chosen order to shape a world's terrain around their own design.
Structure placement
Players place monuments and fortresses in areas where they want them, with their mobs set in the config.
Who it’s for: Players who want to place biomes or structures in an existing world, and server owners who want to control where they appear.
How it compares
ChunkMix is a Fabric mod for 1.21.1 that is required on the client, with the server optional, under a Creative Commons non-commercial, no-derivatives license that is not open source. Biome MOD is a Fabric mod for 1.21.8 that runs on the client and server, under All rights reserved, and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Biome Builder | Fabric | 1.21.1 | Client and server | 2026-06-19 |
| ChunkMix | Fabric | 1.21.1 | Client required, server optional | 2026-04-29 |
| Biome MOD | Fabric | 1.21.8 | Client and server | 2026-03-31 |
Questions
Does Biome Builder need Fabric API?
Does Biome Builder have to be installed on the server?
Where are the anchor settings described?
In the catalog
Biome Builder is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
Biome Builder gives the player the ability to create Minecraft's biomes and structures, wherever they want. Insipired by Terraria's mechanic of "placing down a number of specific blocks turns the area into a particular biome/structure", the mod adds two types of new blocks: Biome Anchors and Structure Anchors.
Official listing
- Modrinth page
- modrinth.com/mod/biome-builder
- Owner
- Loading_Screen_
- Published
- 2026-06-13
- Updated on Modrinth
- 2026-06-19
- Facts verified
- 2026-10-15