diff --git a/src/citrine/__version__.py b/src/citrine/__version__.py
index f87b7d84c..659cac322 100644
--- a/src/citrine/__version__.py
+++ b/src/citrine/__version__.py
@@ -1 +1 @@
-__version__ = "3.21.0"
+__version__ = "3.22.0"
diff --git a/src/citrine/informatics/design_spaces/design_space.py b/src/citrine/informatics/design_spaces/design_space.py
index 77c17dfb5..295d4094e 100644
--- a/src/citrine/informatics/design_spaces/design_space.py
+++ b/src/citrine/informatics/design_spaces/design_space.py
@@ -26,6 +26,15 @@ class DesignSpace(PolymorphicSerializable['DesignSpace'], AsynchronousObject):
     name = properties.String('data.name')
     description = properties.Optional(properties.String(), 'data.description')
 
+    locked_by = properties.Optional(properties.UUID, 'metadata.locked.user',
+                                    serializable=False)
+    """:Optional[UUID]: id of the user whose action cause the design space to
+    be locked, if it is locked"""
+    lock_time = properties.Optional(properties.Datetime, 'metadata.locked.time',
+                                    serializable=False)
+    """:Optional[datetime]: date and time at which the resource was locked,
+    if it is locked"""
+
     @staticmethod
     def wrap_instance(subspace_data: dict) -> dict:
         """Insert a serialized embedded design space into an entity envelope.
@@ -65,6 +74,11 @@ def get_type(cls, data) -> Type[Serializable]:
             'HierarchicalDesignSpace': HierarchicalDesignSpace
         }[data['data']['instance']['type']]
 
+    @property
+    def is_locked(self) -> bool:
+        """If is_locked is true, edits to the design space will be rejected."""
+        return self.locked_by is not None
+
     @property
     def sample_design_space_executions(self):
         """Start a Sample Design Space Execution using the current Design Space."""
diff --git a/tests/resources/test_design_space.py b/tests/resources/test_design_space.py
index 972b8b207..7b95746b0 100644
--- a/tests/resources/test_design_space.py
+++ b/tests/resources/test_design_space.py
@@ -1,6 +1,7 @@
+import random
 import uuid
 from copy import deepcopy
-import random
+from datetime import datetime, timezone
 
 import mock
 import pytest
@@ -534,3 +535,31 @@ def test_carrying_settings_from_get(valid_product_design_space):
 
     assert session.num_calls == 3
     assert session.calls[1] == expected_call
+
+
+def test_locked(valid_product_design_space_data):
+    session = FakeSession()
+    collection = DesignSpaceCollection(project_id=uuid.uuid4(), session=session)
+
+    session.set_response(deepcopy(valid_product_design_space_data))
+
+    ds = collection.get(uuid.uuid4())
+
+    assert not ds.is_locked
+    assert ds.locked_by is None
+    assert ds.lock_time is None
+
+    lock_user = uuid.uuid4()
+    lock_time = datetime(2020, 4, 23, 15, 46, 23, tzinfo=timezone.utc)
+    lock_timestamp = int(lock_time.timestamp()) * 1000
+
+    response_data = deepcopy(valid_product_design_space_data)
+    response_data['metadata']['locked'] = {'user': str(lock_user), 'time': lock_timestamp}
+
+    session.set_response(response_data)
+
+    ds = collection.get(uuid.uuid4())
+
+    assert ds.is_locked
+    assert ds.locked_by == lock_user
+    assert ds.lock_time == lock_time