diff --git a/annotations/src/main/java/mindustry/annotations/entity/EntityIO.java b/annotations/src/main/java/mindustry/annotations/entity/EntityIO.java
index 4d9ce94869..e0c32bc820 100644
--- a/annotations/src/main/java/mindustry/annotations/entity/EntityIO.java
+++ b/annotations/src/main/java/mindustry/annotations/entity/EntityIO.java
@@ -229,7 +229,7 @@ public class EntityIO{
             s(type.equals("boolean") ? "bool" : type.charAt(0) + "", field);
         }else if(instanceOf(type, "mindustry.ctype.Content") && !type.equals("mindustry.ai.UnitStance") && !type.equals("mindustry.ai.UnitCommand")){
             if(write){
-                s("s", field + ".id");
+                s("s", field + " == null ? -1 : " + field + ".id");
             }else{
                 st(field + "mindustry.Vars.content.getByID(mindustry.ctype.ContentType.$L, read.s())", BaseProcessor.simpleName(type).toLowerCase().replace("type", ""));
             }
diff --git a/core/src/mindustry/core/NetClient.java b/core/src/mindustry/core/NetClient.java
index fbbd502826..e38694fe5a 100644
--- a/core/src/mindustry/core/NetClient.java
+++ b/core/src/mindustry/core/NetClient.java
@@ -13,6 +13,7 @@ import arc.util.serialization.*;
 import arc.util.serialization.JsonValue.*;
 import mindustry.*;
 import mindustry.annotations.Annotations.*;
+import mindustry.content.*;
 import mindustry.core.GameState.*;
 import mindustry.entities.*;
 import mindustry.game.EventType.*;
@@ -699,7 +700,7 @@ public class NetClient implements ApplicationListener{
             unit == null ? 0f : unit.vel.x, unit == null ? 0f : unit.vel.y,
             dead ? null : unit.mineTile,
             player.boosting, player.shooting, ui.chatfrag.shown(), control.input.isBuilding,
-            player.isBuilder() && unit != null ? unit.plans : null,
+            player.selectedBlock, player.selectedRotation, player.isBuilder() && unit != null ? unit.plans : null,
             Core.camera.position.x, Core.camera.position.y,
             Core.camera.width, Core.camera.height
             );
diff --git a/core/src/mindustry/core/NetServer.java b/core/src/mindustry/core/NetServer.java
index 25e68576e4..5640d67af6 100644
--- a/core/src/mindustry/core/NetServer.java
+++ b/core/src/mindustry/core/NetServer.java
@@ -647,7 +647,7 @@ public class NetServer implements ApplicationListener{
     float xVelocity, float yVelocity,
     Tile mining,
     boolean boosting, boolean shooting, boolean chatting, boolean building,
-    @Nullable Queue<BuildPlan> plans,
+    Block selectedBlock, int selectedRotation, @Nullable Queue<BuildPlan> plans,
     float viewX, float viewY, float viewWidth, float viewHeight
     ){
         NetConnection con = player.con;
@@ -686,6 +686,8 @@ public class NetServer implements ApplicationListener{
         player.typing = chatting;
         player.shooting = shooting;
         player.boosting = boosting;
+        player.selectedBlock = selectedBlock;
+        player.selectedRotation = selectedRotation;
 
         @Nullable var unit = player.unit();
 
diff --git a/core/src/mindustry/entities/comp/PlayerComp.java b/core/src/mindustry/entities/comp/PlayerComp.java
index 6bf426c4e4..3b32fe410a 100644
--- a/core/src/mindustry/entities/comp/PlayerComp.java
+++ b/core/src/mindustry/entities/comp/PlayerComp.java
@@ -21,6 +21,7 @@ import mindustry.net.Administration.*;
 import mindustry.net.*;
 import mindustry.net.Packets.*;
 import mindustry.ui.*;
+import mindustry.world.*;
 import mindustry.world.blocks.storage.*;
 import mindustry.world.blocks.storage.CoreBlock.*;
 
@@ -37,6 +38,8 @@ abstract class PlayerComp implements UnitController, Entityc, Syncc, Timerc, Dra
     transient @Nullable NetConnection con;
     @ReadOnly Team team = Team.sharded;
     @SyncLocal boolean typing, shooting, boosting;
+    @SyncLocal @Nullable Block selectedBlock;
+    @SyncLocal int selectedRotation;
     @SyncLocal float mouseX, mouseY;
     /** command the unit had before it was controlled. */
     @Nullable @NoSync UnitCommand lastCommand;
diff --git a/core/src/mindustry/entities/comp/UnitComp.java b/core/src/mindustry/entities/comp/UnitComp.java
index 6b44ec2b7e..c814343a5a 100644
--- a/core/src/mindustry/entities/comp/UnitComp.java
+++ b/core/src/mindustry/entities/comp/UnitComp.java
@@ -276,6 +276,8 @@ abstract class UnitComp implements Healthc, Physicsc, Hitboxc, Statusc, Teamc, I
             case mining -> mining() ? 1 : 0;
             case mineX -> mining() ? mineTile.x : -1;
             case mineY -> mining() ? mineTile.y : -1;
+            case buildX -> isBuilding() ? buildPlan().x : -1;
+            case buildY -> isBuilding() ? buildPlan().y : -1;
             case armor -> armorOverride >= 0f ? armorOverride : armor;
             case flag -> flag;
             case speed -> type.speed * 60f / tilesize * speedMultiplier;
@@ -289,6 +291,7 @@ abstract class UnitComp implements Healthc, Physicsc, Hitboxc, Statusc, Teamc, I
             case payloadCapacity -> type.payloadCapacity / tilePayload;
             case size -> hitSize / tilesize;
             case color -> Color.toDoubleBits(team.color.r, team.color.g, team.color.b, 1f);
+            case selectedRotation -> controller instanceof Player p ? p.selectedRotation : 0;
             default -> Float.NaN;
         };
     }
@@ -304,6 +307,9 @@ abstract class UnitComp implements Healthc, Physicsc, Hitboxc, Statusc, Teamc, I
                 (pay.payloads().isEmpty() ? null :
                 pay.payloads().peek() instanceof UnitPayload p1 ? p1.unit.type :
                 pay.payloads().peek() instanceof BuildPayload p2 ? p2.block() : null) : null;
+            case building -> isBuilding() && !buildPlan().breaking ? buildPlan().tile().build : null;
+            case breaking -> isBuilding() && buildPlan().breaking ? buildPlan().tile().build : null;
+            case selectedBlock -> controller instanceof Player p ? p.selectedBlock : null;
             default -> noSensed;
         };
     }
diff --git a/core/src/mindustry/input/InputHandler.java b/core/src/mindustry/input/InputHandler.java
index 3335642327..68bb108c22 100644
--- a/core/src/mindustry/input/InputHandler.java
+++ b/core/src/mindustry/input/InputHandler.java
@@ -944,6 +944,9 @@ public abstract class InputHandler implements InputProcessor, GestureListener{
             block = null;
         }
 
+        player.selectedBlock = block;
+        player.selectedRotation = rotation;
+
         wasShooting = player.shooting;
 
         //only reset the controlled type and control a unit after the timer runs out
diff --git a/core/src/mindustry/io/TypeIO.java b/core/src/mindustry/io/TypeIO.java
index c0b1b753d1..18f4049b3f 100644
--- a/core/src/mindustry/io/TypeIO.java
+++ b/core/src/mindustry/io/TypeIO.java
@@ -392,11 +392,12 @@ public class TypeIO{
     }
 
     public static void writeBlock(Writes write, Block block){
-        write.s(block.id);
+        write.s(block == null ? -1 : block.id);
     }
 
     public static Block readBlock(Reads read){
-        return content.block(read.s());
+        short id = read.s();
+        return id == -1 ? null : content.block(id);
     }
 
     /** @return the maximum acceptable amount of plans to send over the network */
diff --git a/core/src/mindustry/logic/LAccess.java b/core/src/mindustry/logic/LAccess.java
index 5f3b25f890..91c4e70113 100644
--- a/core/src/mindustry/logic/LAccess.java
+++ b/core/src/mindustry/logic/LAccess.java
@@ -51,6 +51,10 @@ public enum LAccess{
     mineX,
     mineY,
     mining,
+    buildX,
+    buildY,
+    building,
+    breaking,
     speed,
     team,
     type,
@@ -64,6 +68,8 @@ public enum LAccess{
     payloadCapacity,
     maxUnits,
     id,
+    selectedBlock,
+    selectedRotation,
 
     //values with parameters are considered controllable
     enabled("to"), //"to" is standard for single parameter access
diff --git a/core/src/mindustry/world/blocks/ConstructBlock.java b/core/src/mindustry/world/blocks/ConstructBlock.java
index 68a5475d19..f8bf94b418 100644
--- a/core/src/mindustry/world/blocks/ConstructBlock.java
+++ b/core/src/mindustry/world/blocks/ConstructBlock.java
@@ -212,8 +212,19 @@ public class ConstructBlock extends Block{
 
         @Override
         public double sense(LAccess sensor){
-            if(sensor == LAccess.progress) return Mathf.clamp(progress);
-            return super.sense(sensor);
+            return switch(sensor){
+                case progress -> Mathf.clamp(progress);
+                case breaking -> activeDeconstruct ? 1 : 0;
+                default -> super.sense(sensor);
+            };
+        }
+
+        @Override
+        public Object senseObject(LAccess sensor){
+            return switch(sensor){
+                case building -> current;
+                default -> super.senseObject(sensor);
+            };
         }
 
         @Override
diff --git a/core/src/mindustry/world/blocks/defense/BuildTurret.java b/core/src/mindustry/world/blocks/defense/BuildTurret.java
index 58bd7912f1..e5616694bf 100644
--- a/core/src/mindustry/world/blocks/defense/BuildTurret.java
+++ b/core/src/mindustry/world/blocks/defense/BuildTurret.java
@@ -13,6 +13,7 @@ import mindustry.game.Teams.*;
 import mindustry.gen.*;
 import mindustry.graphics.*;
 import mindustry.io.*;
+import mindustry.logic.*;
 import mindustry.type.*;
 import mindustry.world.*;
 import mindustry.world.blocks.ConstructBlock.*;
@@ -264,5 +265,21 @@ public class BuildTurret extends BaseTurret{
                 }
             }
         }
+
+        @Override
+        public double sense(LAccess sensor){
+            return switch(sensor){
+                case buildX, buildY -> unit.sense(sensor);
+                default -> super.sense(sensor);
+            };
+        }
+
+        @Override
+        public Object senseObject(LAccess sensor){
+            return switch(sensor){
+                case building, breaking -> unit.senseObject(sensor);
+                default -> super.senseObject(sensor);
+            };
+        }
     }
 }