diff --git a/src/main/java/org/betterx/bclib/api/v2/levelgen/structures/BCLStructure.java b/src/main/java/org/betterx/bclib/api/v2/levelgen/structures/BCLStructure.java
index deb03584..09cef8a5 100644
--- a/src/main/java/org/betterx/bclib/api/v2/levelgen/structures/BCLStructure.java
+++ b/src/main/java/org/betterx/bclib/api/v2/levelgen/structures/BCLStructure.java
@@ -28,6 +28,8 @@ public abstract class BCLStructure<S extends Structure> {
         private final Function<Structure.StructureSettings, S> structureBuilder;
         private final TerrainAdjustment terrainAdjustment;
 
+        private Bound<S> registered;
+
         protected Unbound(
                 @NotNull ResourceLocation id,
                 @NotNull GenerationStep.Decoration step,
@@ -48,12 +50,14 @@ public abstract class BCLStructure<S extends Structure> {
                     BCLStructure.registerStructureType(id, codec)
             );
 
+            registered = null;
             this.structureBuilder = structureBuilder;
             this.terrainAdjustment = terrainAdjustment;
         }
 
 
         public Bound<S> register(BootstapContext<Structure> bootstrapContext) {
+            if (registered != null) return registered;
             S baseStructure = structureBuilder.apply(structure(
                     bootstrapContext,
                     this.biomeTag,
@@ -61,7 +65,8 @@ public abstract class BCLStructure<S extends Structure> {
                     terrainAdjustment
             ));
             Holder.Reference<Structure> structure = bootstrapContext.register(structureKey, baseStructure);
-            return new Bound<>(
+            BCLStructureBuilder.UNBOUND_STRUCTURES.remove(this);
+            registered = new Bound<>(
                     this.id,
                     this.structureKey,
                     this.structureSetKey,
@@ -73,6 +78,7 @@ public abstract class BCLStructure<S extends Structure> {
                     baseStructure,
                     structure
             );
+            return registered;
         }
     }
 
@@ -243,11 +249,16 @@ public abstract class BCLStructure<S extends Structure> {
         return biomes;
     }
 
+    private boolean registeredSet = false;
+
     public void registerSet(BootstapContext<StructureSet> bootstrapContext) {
+        if (registeredSet) return;
+        registeredSet = true;
         bootstrapContext.register(structureSetKey, new StructureSet(
                 bootstrapContext.lookup(Registries.STRUCTURE).getOrThrow(structureKey),
                 spreadConfig
         ));
+        BCLStructureBuilder.UNBOUND_STRUCTURE_SETS.remove(this);
     }
 
     public abstract Bound<S> register(BootstapContext<Structure> bootstrapContext);
diff --git a/src/main/java/org/betterx/bclib/api/v2/levelgen/structures/BCLStructureBuilder.java b/src/main/java/org/betterx/bclib/api/v2/levelgen/structures/BCLStructureBuilder.java
index dabe662b..cd930060 100644
--- a/src/main/java/org/betterx/bclib/api/v2/levelgen/structures/BCLStructureBuilder.java
+++ b/src/main/java/org/betterx/bclib/api/v2/levelgen/structures/BCLStructureBuilder.java
@@ -3,19 +3,24 @@ package org.betterx.bclib.api.v2.levelgen.structures;
 import org.betterx.worlds.together.tag.v3.TagManager;
 
 import com.mojang.serialization.Codec;
+import net.minecraft.data.worldgen.BootstapContext;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.tags.TagKey;
 import net.minecraft.world.level.biome.Biome;
 import net.minecraft.world.level.levelgen.GenerationStep;
 import net.minecraft.world.level.levelgen.structure.Structure;
+import net.minecraft.world.level.levelgen.structure.StructureSet;
 import net.minecraft.world.level.levelgen.structure.TerrainAdjustment;
 import net.minecraft.world.level.levelgen.structure.placement.RandomSpreadStructurePlacement;
 import net.minecraft.world.level.levelgen.structure.placement.RandomSpreadType;
 import net.minecraft.world.level.levelgen.structure.placement.StructurePlacement;
 
+import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.function.Function;
 
 public class BCLStructureBuilder<S extends Structure> {
+    static final ConcurrentLinkedQueue<BCLStructure.Unbound<?>> UNBOUND_STRUCTURES = new ConcurrentLinkedQueue<>();
+    static final ConcurrentLinkedQueue<BCLStructure.Unbound<?>> UNBOUND_STRUCTURE_SETS = new ConcurrentLinkedQueue<>();
 
     private final ResourceLocation structureID;
     private final Function<Structure.StructureSettings, S> structureBuilder;
@@ -98,7 +103,7 @@ public class BCLStructureBuilder<S extends Structure> {
         if (codec == null) codec(Structure.simpleCodec(structureBuilder));
         if (biomeTag == null) biomeTag(structureID.getNamespace(), structureID.getPath());
 
-        return new BCLStructure.Unbound<>(
+        var res = new BCLStructure.Unbound<>(
                 structureID,
                 step,
                 placement,
@@ -107,5 +112,18 @@ public class BCLStructureBuilder<S extends Structure> {
                 structureBuilder,
                 terrainAdjustment
         );
+        UNBOUND_STRUCTURES.add(res);
+        UNBOUND_STRUCTURE_SETS.add(res);
+        return res;
+    }
+
+    public static void registerUnbound(BootstapContext<Structure> context) {
+        UNBOUND_STRUCTURES.forEach(s -> s.register(context));
+        UNBOUND_STRUCTURES.clear();
+    }
+
+    public static void registerUnboundSets(BootstapContext<StructureSet> context) {
+        UNBOUND_STRUCTURE_SETS.forEach(s -> s.registerSet(context));
+        UNBOUND_STRUCTURE_SETS.clear();
     }
 }