diff --git a/resources/sql/autopatches/20180730.project.01.spaces.sql b/resources/sql/autopatches/20180730.project.01.spaces.sql
new file mode 100644
--- /dev/null
+++ b/resources/sql/autopatches/20180730.project.01.spaces.sql
@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_project.project
+  ADD COLUMN spacePHID VARBINARY(64) DEFAULT NULL;
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -9752,6 +9752,7 @@
       'PhabricatorFerretInterface',
       'PhabricatorConduitResultInterface',
       'PhabricatorColumnProxyInterface',
+      'PhabricatorSpacesInterface',
     ),
     'PhabricatorProjectAddHeraldAction' => 'PhabricatorProjectHeraldAction',
     'PhabricatorProjectApplication' => 'PhabricatorApplication',
diff --git a/src/applications/project/storage/PhabricatorProject.php b/src/applications/project/storage/PhabricatorProject.php
--- a/src/applications/project/storage/PhabricatorProject.php
+++ b/src/applications/project/storage/PhabricatorProject.php
@@ -11,7 +11,8 @@
     PhabricatorFulltextInterface,
     PhabricatorFerretInterface,
     PhabricatorConduitResultInterface,
-    PhabricatorColumnProxyInterface {
+    PhabricatorColumnProxyInterface,
+    PhabricatorSpacesInterface {
 
   protected $name;
   protected $status = PhabricatorProjectStatus::STATUS_ACTIVE;
@@ -38,6 +39,7 @@
   protected $projectPathKey;
 
   protected $properties = array();
+  protected $spacePHID;
 
   private $memberPHIDs = self::ATTACHABLE;
   private $watcherPHIDs = self::ATTACHABLE;
@@ -82,6 +84,7 @@
       ->setViewPolicy($view_policy)
       ->setEditPolicy($edit_policy)
       ->setJoinPolicy($join_policy)
+      ->setSpacePHID($actor->getDefaultSpacePHID())
       ->setIsMembershipLocked(0)
       ->attachMemberPHIDs(array())
       ->attachSlugs(array())
@@ -697,6 +700,14 @@
   }
 
 
+/* -(  PhabricatorSpacesInterface  )----------------------------------------- */
+
+
+  public function getSpacePHID() {
+    return $this->spacePHID;
+  }
+
+
 /* -(  PhabricatorDestructibleInterface  )----------------------------------- */