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
@@ -2910,6 +2910,7 @@
     'PhabricatorDashboardApplication' => 'applications/dashboard/application/PhabricatorDashboardApplication.php',
     'PhabricatorDashboardApplicationInstallWorkflow' => 'applications/dashboard/install/PhabricatorDashboardApplicationInstallWorkflow.php',
     'PhabricatorDashboardArchiveController' => 'applications/dashboard/controller/dashboard/PhabricatorDashboardArchiveController.php',
+    'PhabricatorDashboardColumn' => 'applications/dashboard/layoutconfig/PhabricatorDashboardColumn.php',
     'PhabricatorDashboardConsoleController' => 'applications/dashboard/controller/PhabricatorDashboardConsoleController.php',
     'PhabricatorDashboardController' => 'applications/dashboard/controller/PhabricatorDashboardController.php',
     'PhabricatorDashboardDAO' => 'applications/dashboard/storage/PhabricatorDashboardDAO.php',
@@ -2919,6 +2920,8 @@
     'PhabricatorDashboardEditController' => 'applications/dashboard/controller/dashboard/PhabricatorDashboardEditController.php',
     'PhabricatorDashboardEditEngine' => 'applications/dashboard/editor/PhabricatorDashboardEditEngine.php',
     'PhabricatorDashboardFavoritesInstallWorkflow' => 'applications/dashboard/install/PhabricatorDashboardFavoritesInstallWorkflow.php',
+    'PhabricatorDashboardFullLayoutMode' => 'applications/dashboard/layoutconfig/PhabricatorDashboardFullLayoutMode.php',
+    'PhabricatorDashboardHalfLayoutMode' => 'applications/dashboard/layoutconfig/PhabricatorDashboardHalfLayoutMode.php',
     'PhabricatorDashboardHomeInstallWorkflow' => 'applications/dashboard/install/PhabricatorDashboardHomeInstallWorkflow.php',
     'PhabricatorDashboardIconSet' => 'applications/dashboard/icon/PhabricatorDashboardIconSet.php',
     'PhabricatorDashboardIconTransaction' => 'applications/dashboard/xaction/dashboard/PhabricatorDashboardIconTransaction.php',
@@ -2926,12 +2929,14 @@
     'PhabricatorDashboardInstallController' => 'applications/dashboard/controller/dashboard/PhabricatorDashboardInstallController.php',
     'PhabricatorDashboardInstallWorkflow' => 'applications/dashboard/install/PhabricatorDashboardInstallWorkflow.php',
     'PhabricatorDashboardLayoutConfig' => 'applications/dashboard/layoutconfig/PhabricatorDashboardLayoutConfig.php',
+    'PhabricatorDashboardLayoutMode' => 'applications/dashboard/layoutconfig/PhabricatorDashboardLayoutMode.php',
     'PhabricatorDashboardLayoutTransaction' => 'applications/dashboard/xaction/dashboard/PhabricatorDashboardLayoutTransaction.php',
     'PhabricatorDashboardListController' => 'applications/dashboard/controller/PhabricatorDashboardListController.php',
     'PhabricatorDashboardMovePanelController' => 'applications/dashboard/controller/PhabricatorDashboardMovePanelController.php',
     'PhabricatorDashboardNameTransaction' => 'applications/dashboard/xaction/dashboard/PhabricatorDashboardNameTransaction.php',
     'PhabricatorDashboardNgrams' => 'applications/dashboard/storage/PhabricatorDashboardNgrams.php',
     'PhabricatorDashboardObjectInstallWorkflow' => 'applications/dashboard/install/PhabricatorDashboardObjectInstallWorkflow.php',
+    'PhabricatorDashboardOneThirdLayoutMode' => 'applications/dashboard/layoutconfig/PhabricatorDashboardOneThirdLayoutMode.php',
     'PhabricatorDashboardPanel' => 'applications/dashboard/storage/PhabricatorDashboardPanel.php',
     'PhabricatorDashboardPanelArchiveController' => 'applications/dashboard/controller/panel/PhabricatorDashboardPanelArchiveController.php',
     'PhabricatorDashboardPanelContainerIndexEngineExtension' => 'applications/dashboard/engineextension/PhabricatorDashboardPanelContainerIndexEngineExtension.php',
@@ -3006,6 +3011,7 @@
     'PhabricatorDashboardTransactionEditor' => 'applications/dashboard/editor/PhabricatorDashboardTransactionEditor.php',
     'PhabricatorDashboardTransactionQuery' => 'applications/dashboard/query/PhabricatorDashboardTransactionQuery.php',
     'PhabricatorDashboardTransactionType' => 'applications/dashboard/xaction/dashboard/PhabricatorDashboardTransactionType.php',
+    'PhabricatorDashboardTwoThirdsLayoutMode' => 'applications/dashboard/layoutconfig/PhabricatorDashboardTwoThirdsLayoutMode.php',
     'PhabricatorDashboardViewController' => 'applications/dashboard/controller/dashboard/PhabricatorDashboardViewController.php',
     'PhabricatorDataCacheSpec' => 'applications/cache/spec/PhabricatorDataCacheSpec.php',
     'PhabricatorDataNotAttachedException' => 'infrastructure/storage/lisk/PhabricatorDataNotAttachedException.php',
@@ -8904,6 +8910,7 @@
     'PhabricatorDashboardApplication' => 'PhabricatorApplication',
     'PhabricatorDashboardApplicationInstallWorkflow' => 'PhabricatorDashboardInstallWorkflow',
     'PhabricatorDashboardArchiveController' => 'PhabricatorDashboardController',
+    'PhabricatorDashboardColumn' => 'Phobject',
     'PhabricatorDashboardConsoleController' => 'PhabricatorDashboardController',
     'PhabricatorDashboardController' => 'PhabricatorController',
     'PhabricatorDashboardDAO' => 'PhabricatorLiskDAO',
@@ -8913,6 +8920,8 @@
     'PhabricatorDashboardEditController' => 'PhabricatorDashboardController',
     'PhabricatorDashboardEditEngine' => 'PhabricatorEditEngine',
     'PhabricatorDashboardFavoritesInstallWorkflow' => 'PhabricatorDashboardApplicationInstallWorkflow',
+    'PhabricatorDashboardFullLayoutMode' => 'PhabricatorDashboardLayoutMode',
+    'PhabricatorDashboardHalfLayoutMode' => 'PhabricatorDashboardLayoutMode',
     'PhabricatorDashboardHomeInstallWorkflow' => 'PhabricatorDashboardApplicationInstallWorkflow',
     'PhabricatorDashboardIconSet' => 'PhabricatorIconSet',
     'PhabricatorDashboardIconTransaction' => 'PhabricatorDashboardTransactionType',
@@ -8920,12 +8929,14 @@
     'PhabricatorDashboardInstallController' => 'PhabricatorDashboardController',
     'PhabricatorDashboardInstallWorkflow' => 'Phobject',
     'PhabricatorDashboardLayoutConfig' => 'Phobject',
+    'PhabricatorDashboardLayoutMode' => 'Phobject',
     'PhabricatorDashboardLayoutTransaction' => 'PhabricatorDashboardTransactionType',
     'PhabricatorDashboardListController' => 'PhabricatorDashboardController',
     'PhabricatorDashboardMovePanelController' => 'PhabricatorDashboardController',
     'PhabricatorDashboardNameTransaction' => 'PhabricatorDashboardTransactionType',
     'PhabricatorDashboardNgrams' => 'PhabricatorSearchNgrams',
     'PhabricatorDashboardObjectInstallWorkflow' => 'PhabricatorDashboardInstallWorkflow',
+    'PhabricatorDashboardOneThirdLayoutMode' => 'PhabricatorDashboardLayoutMode',
     'PhabricatorDashboardPanel' => array(
       'PhabricatorDashboardDAO',
       'PhabricatorApplicationTransactionInterface',
@@ -9015,6 +9026,7 @@
     'PhabricatorDashboardTransactionEditor' => 'PhabricatorApplicationTransactionEditor',
     'PhabricatorDashboardTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
     'PhabricatorDashboardTransactionType' => 'PhabricatorModularTransactionType',
+    'PhabricatorDashboardTwoThirdsLayoutMode' => 'PhabricatorDashboardLayoutMode',
     'PhabricatorDashboardViewController' => 'PhabricatorDashboardProfileController',
     'PhabricatorDataCacheSpec' => 'PhabricatorCacheSpec',
     'PhabricatorDataNotAttachedException' => 'Exception',
diff --git a/src/applications/dashboard/editor/PhabricatorDashboardEditEngine.php b/src/applications/dashboard/editor/PhabricatorDashboardEditEngine.php
--- a/src/applications/dashboard/editor/PhabricatorDashboardEditEngine.php
+++ b/src/applications/dashboard/editor/PhabricatorDashboardEditEngine.php
@@ -67,6 +67,8 @@
   }
 
   protected function buildCustomEditFields($object) {
+    $layout_options = PhabricatorDashboardLayoutMode::getLayoutModeMap();
+
     $fields = array(
       id(new PhabricatorTextEditField())
         ->setKey('name')
@@ -96,8 +98,7 @@
         ->setConduitTypeDescription(pht('New dashboard layout mode.'))
         ->setTransactionType(
           PhabricatorDashboardLayoutTransaction::TRANSACTIONTYPE)
-        ->setOptions(
-          PhabricatorDashboardLayoutConfig::getLayoutModeSelectOptions())
+        ->setOptions($layout_options)
         ->setValue($object->getRawLayoutMode()),
     );
 
diff --git a/src/applications/dashboard/layoutconfig/PhabricatorDashboardColumn.php b/src/applications/dashboard/layoutconfig/PhabricatorDashboardColumn.php
new file mode 100644
--- /dev/null
+++ b/src/applications/dashboard/layoutconfig/PhabricatorDashboardColumn.php
@@ -0,0 +1,27 @@
+<?php
+
+final class PhabricatorDashboardColumn
+  extends Phobject {
+
+  private $columnKey;
+  private $classes = array();
+
+  public function setColumnKey($column_key) {
+    $this->columnKey = $column_key;
+    return $this;
+  }
+
+  public function getColumnKey() {
+    return $this->columnKey;
+  }
+
+  public function addClass($class) {
+    $this->classes[] = $class;
+    return $this;
+  }
+
+  public function getClasses() {
+    return $this->classes;
+  }
+
+}
diff --git a/src/applications/dashboard/layoutconfig/PhabricatorDashboardFullLayoutMode.php b/src/applications/dashboard/layoutconfig/PhabricatorDashboardFullLayoutMode.php
new file mode 100644
--- /dev/null
+++ b/src/applications/dashboard/layoutconfig/PhabricatorDashboardFullLayoutMode.php
@@ -0,0 +1,23 @@
+<?php
+
+final class PhabricatorDashboardFullLayoutMode
+  extends PhabricatorDashboardLayoutMode {
+
+  const LAYOUTMODE = 'layout-mode-full';
+
+  public function getLayoutModeOrder() {
+    return 0;
+  }
+
+  public function getLayoutModeName() {
+    return pht('One Column: 100%%');
+  }
+
+  public function getLayoutModeColumns() {
+    return array(
+      $this->newColumn()
+        ->setColumnKey('main'),
+    );
+  }
+
+}
diff --git a/src/applications/dashboard/layoutconfig/PhabricatorDashboardHalfLayoutMode.php b/src/applications/dashboard/layoutconfig/PhabricatorDashboardHalfLayoutMode.php
new file mode 100644
--- /dev/null
+++ b/src/applications/dashboard/layoutconfig/PhabricatorDashboardHalfLayoutMode.php
@@ -0,0 +1,27 @@
+<?php
+
+final class PhabricatorDashboardHalfLayoutMode
+  extends PhabricatorDashboardLayoutMode {
+
+  const LAYOUTMODE = 'layout-mode-half-and-half';
+
+  public function getLayoutModeOrder() {
+    return 500;
+  }
+
+  public function getLayoutModeName() {
+    return pht('Two Columns: 50%%/50%%');
+  }
+
+  public function getLayoutModeColumns() {
+    return array(
+      $this->newColumn()
+        ->setColumnKey('left')
+        ->addClass('half'),
+      $this->newColumn()
+        ->setColumnKey('right')
+        ->addClass('half'),
+    );
+  }
+
+}
diff --git a/src/applications/dashboard/layoutconfig/PhabricatorDashboardLayoutConfig.php b/src/applications/dashboard/layoutconfig/PhabricatorDashboardLayoutConfig.php
--- a/src/applications/dashboard/layoutconfig/PhabricatorDashboardLayoutConfig.php
+++ b/src/applications/dashboard/layoutconfig/PhabricatorDashboardLayoutConfig.php
@@ -107,15 +107,6 @@
     return $class;
   }
 
-  public static function getLayoutModeSelectOptions() {
-    return array(
-      self::MODE_FULL             => pht('One full-width column'),
-      self::MODE_HALF_AND_HALF    => pht('Two columns, 1/2 and 1/2'),
-      self::MODE_THIRD_AND_THIRDS => pht('Two columns, 1/3 and 2/3'),
-      self::MODE_THIRDS_AND_THIRD => pht('Two columns, 2/3 and 1/3'),
-    );
-  }
-
   public static function newFromDictionary(array $dict) {
     $layout_config = id(new PhabricatorDashboardLayoutConfig())
       ->setLayoutMode(idx($dict, 'layoutMode', self::MODE_FULL));
diff --git a/src/applications/dashboard/layoutconfig/PhabricatorDashboardLayoutMode.php b/src/applications/dashboard/layoutconfig/PhabricatorDashboardLayoutMode.php
new file mode 100644
--- /dev/null
+++ b/src/applications/dashboard/layoutconfig/PhabricatorDashboardLayoutMode.php
@@ -0,0 +1,34 @@
+<?php
+
+abstract class PhabricatorDashboardLayoutMode
+  extends Phobject {
+
+  final public function getLayoutModeKey() {
+    return $this->getPhobjectClassConstant('LAYOUTMODE', 32);
+  }
+
+  public function getLayoutModeOrder() {
+    return 1000;
+  }
+
+  abstract public function getLayoutModeName();
+  abstract public function getLayoutModeColumns();
+
+  final protected function newColumn() {
+    return new PhabricatorDashboardColumn();
+  }
+
+  final public static function getAllLayoutModes() {
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getLayoutModeKey')
+      ->setSortMethod('getLayoutModeOrder')
+      ->execute();
+  }
+
+  final public static function getLayoutModeMap() {
+    $modes = self::getAllLayoutModes();
+    return mpull($modes, 'getLayoutModeName', 'getLayoutModeKey');
+  }
+
+}
diff --git a/src/applications/dashboard/layoutconfig/PhabricatorDashboardOneThirdLayoutMode.php b/src/applications/dashboard/layoutconfig/PhabricatorDashboardOneThirdLayoutMode.php
new file mode 100644
--- /dev/null
+++ b/src/applications/dashboard/layoutconfig/PhabricatorDashboardOneThirdLayoutMode.php
@@ -0,0 +1,27 @@
+<?php
+
+final class PhabricatorDashboardOneThirdLayoutMode
+  extends PhabricatorDashboardLayoutMode {
+
+  const LAYOUTMODE = 'layout-mode-third-and-thirds';
+
+  public function getLayoutModeOrder() {
+    return 700;
+  }
+
+  public function getLayoutModeName() {
+    return pht('Two Columns: 33%%/66%%');
+  }
+
+  public function getLayoutModeColumns() {
+    return array(
+      $this->newColumn()
+        ->setColumnKey('left')
+        ->addClass('third'),
+      $this->newColumn()
+        ->setColumnKey('right')
+        ->addClass('thirds'),
+    );
+  }
+
+}
diff --git a/src/applications/dashboard/layoutconfig/PhabricatorDashboardTwoThirdsLayoutMode.php b/src/applications/dashboard/layoutconfig/PhabricatorDashboardTwoThirdsLayoutMode.php
new file mode 100644
--- /dev/null
+++ b/src/applications/dashboard/layoutconfig/PhabricatorDashboardTwoThirdsLayoutMode.php
@@ -0,0 +1,27 @@
+<?php
+
+final class PhabricatorDashboardTwoThirdsLayoutMode
+  extends PhabricatorDashboardLayoutMode {
+
+  const LAYOUTMODE = 'layout-mode-thirds-and-third';
+
+  public function getLayoutModeOrder() {
+    return 600;
+  }
+
+  public function getLayoutModeName() {
+    return pht('Two Columns: 66%%/33%%');
+  }
+
+  public function getLayoutModeColumns() {
+    return array(
+      $this->newColumn()
+        ->setColumnKey('left')
+        ->addClass('thirds'),
+      $this->newColumn()
+        ->setColumnKey('right')
+        ->addClass('third'),
+    );
+  }
+
+}
diff --git a/src/applications/dashboard/xaction/dashboard/PhabricatorDashboardLayoutTransaction.php b/src/applications/dashboard/xaction/dashboard/PhabricatorDashboardLayoutTransaction.php
--- a/src/applications/dashboard/xaction/dashboard/PhabricatorDashboardLayoutTransaction.php
+++ b/src/applications/dashboard/xaction/dashboard/PhabricatorDashboardLayoutTransaction.php
@@ -26,7 +26,7 @@
   public function validateTransactions($object, array $xactions) {
     $errors = array();
 
-    $mode_map = PhabricatorDashboardLayoutConfig::getLayoutModeSelectOptions();
+    $mode_map = PhabricatorDashboardLayoutMode::getLayoutModeMap();
 
     $old_value = $object->getRawLayoutMode();
     foreach ($xactions as $xaction) {