ECB Builder is a Minecraft Java Fabric 1.21.1 mod that lets players generate original structures using simple /ecb commands. Instead of building every block by hand, players can type prompts like /ecb build a house, /ecb build a city, /ecb build a castle, or /ecb build an underground base, and ECB Builder will create the structure directly in the world.
ECB Builder is designed to be more than a basic house generator. It can create houses, towns, cities, castles, towers, bridges, farms, greenhouses, parks, statues, ships, docks, underground bases, underground cities, cave builds, survival rooms, storage areas, and more.
Simple /ecb command system
Prompt-based structure generation
Houses, cities, towns, castles, underground bases, and underground cities
Preview and confirm system
Undo support
Saved build support
Terrain blending for hills, slopes, and uneven ground
Biome-adaptive block palettes
Better foundations so towns and cities do not float awkwardly
Underground builds with ladder access, tunnels, doors, and lighting
Safer furniture placement so doors and beds are not blocked
Dense lighting for underground structures
Mob clearing support for underground builds
Sorted storage support
Safe furniture and interior generation
Balanced survival-friendly loot
Optional EPC Buildet API support for smarter planning
/ecb help/ecb examples/ecb build a house/ecb build a large medieval city/ecb build a hidden underground base/ecb build an underground city/ecb preview a castle/ecb confirm/ecb undo/ecb add light/ecb add loot/ecb add animals
ECB Builder can work by itself, but it also supports the optional EPC Buildet API companion mod. The API acts like a local planning brain for ECB Builder and helps with underground structures, city planning, Build IDs, safer placement rules, access tunnels, lighting plans, and structure layout logic.
The API is optional, but recommended for the best underground base and underground city generation.
ECB Builder is made to help players build faster without breaking survival gameplay. It avoids overpowered rewards, rare loot, diamonds, netherite, enchanted gear, and progression-breaking items.
The mod also focuses on original Minecraft-style builds instead of copying copyrighted or trademarked designs.
Minecraft Java Edition 1.21.1
Fabric Loader
Fabric API
Java 21
