diff --git a/src/albert/collections/lots.py b/src/albert/collections/lots.py
index 96b71a17..35f1ae00 100644
--- a/src/albert/collections/lots.py
+++ b/src/albert/collections/lots.py
@@ -403,21 +403,22 @@ def adjust(
         else:
             delta = -current
 
-        patch_payload = PatchPayload(
-            data=[
-                PatchDatum(
-                    operation=PatchOperation.UPDATE,
-                    attribute="inventoryOnHand",
-                    old_value=str(existing_lot.inventory_on_hand),
-                    new_value=self._format_inventory_delta(delta),
-                )
-            ]
-        )
-        payload = patch_payload.model_dump(mode="json", by_alias=True)
-        if description is not None:
-            payload["notes"] = description
+        if delta != 0:
+            patch_payload = PatchPayload(
+                data=[
+                    PatchDatum(
+                        operation=PatchOperation.UPDATE,
+                        attribute="inventoryOnHand",
+                        old_value=str(existing_lot.inventory_on_hand),
+                        new_value=self._format_inventory_delta(delta),
+                    )
+                ]
+            )
+            payload = patch_payload.model_dump(mode="json", by_alias=True)
+            if description is not None:
+                payload["notes"] = description
 
-        self.session.patch(f"{self.base_path}/{lot_id}", json=payload)
+            self.session.patch(f"{self.base_path}/{lot_id}", json=payload)
         return self.get_by_id(id=lot_id)
 
     @validate_call
@@ -450,22 +451,24 @@ def transfer(
         """
         if quantity == "ALL":
             source_lot = self.get_by_id(id=lot_id)
-            patch_payload = PatchPayload(
-                data=[
-                    PatchDatum(
-                        operation=PatchOperation.UPDATE,
-                        attribute="storageLocation",
-                        old_value=source_lot.storage_location.id
-                        if source_lot.storage_location
-                        else None,
-                        new_value=storage_location_id,
-                    )
-                ]
-            )
-            self.session.patch(
-                f"{self.base_path}/{lot_id}",
-                json=patch_payload.model_dump(mode="json", by_alias=True),
+            current_location_id = (
+                source_lot.storage_location.id if source_lot.storage_location else None
             )
+            if current_location_id != storage_location_id:
+                patch_payload = PatchPayload(
+                    data=[
+                        PatchDatum(
+                            operation=PatchOperation.UPDATE,
+                            attribute="storageLocation",
+                            old_value=current_location_id,
+                            new_value=storage_location_id,
+                        )
+                    ]
+                )
+                self.session.patch(
+                    f"{self.base_path}/{lot_id}",
+                    json=patch_payload.model_dump(mode="json", by_alias=True),
+                )
             return self.get_by_id(id=lot_id)
 
         transfer_quantity = quantity
diff --git a/tests/collections/test_lots.py b/tests/collections/test_lots.py
index 2aa35dcc..76132582 100644
--- a/tests/collections/test_lots.py
+++ b/tests/collections/test_lots.py
@@ -238,3 +238,37 @@ def test_transfer_all_quantity(
     assert updated_lot.inventory_on_hand == pytest.approx(seeded_lot.inventory_on_hand)
     assert updated_lot.storage_location is not None
     assert updated_lot.storage_location.id == destination.id
+
+
+def test_transfer_all_same_location_no_op(client: Albert, seeded_lot: Lot):
+    """Test that transferring ALL to the current location does not raise an error."""
+    current_location_id = seeded_lot.storage_location.id if seeded_lot.storage_location else None
+    assert current_location_id is not None, "Seeded lot must have a storage location"
+
+    result = client.lots.transfer(
+        lot_id=seeded_lot.id,
+        quantity="ALL",
+        storage_location_id=current_location_id,
+    )
+    assert result.id == seeded_lot.id
+    assert result.storage_location is not None
+    assert result.storage_location.id == current_location_id
+
+
+def test_adjust_set_no_op(client: Albert, seeded_lot: Lot):
+    """Test that SET to the current inventory value does not raise an error."""
+    result = client.lots.adjust(
+        lot_id=seeded_lot.id,
+        action=LotAdjustmentAction.SET,
+        quantity=seeded_lot.inventory_on_hand,
+    )
+    assert result.inventory_on_hand == pytest.approx(seeded_lot.inventory_on_hand)
+
+
+def test_adjust_zero_no_op(client: Albert, seeded_lot: Lot):
+    """Test that ZERO on a lot already at zero does not raise an error."""
+    # First zero it out
+    client.lots.adjust(lot_id=seeded_lot.id, action=LotAdjustmentAction.ZERO)
+    # Zero again — should be a no-op without error
+    result = client.lots.adjust(lot_id=seeded_lot.id, action=LotAdjustmentAction.ZERO)
+    assert result.inventory_on_hand == pytest.approx(0)