diff -u b/core/modules/layout_builder/src/Annotation/SectionStorage.php b/core/modules/layout_builder/src/Annotation/SectionStorage.php
--- b/core/modules/layout_builder/src/Annotation/SectionStorage.php
+++ b/core/modules/layout_builder/src/Annotation/SectionStorage.php
@@ -23,6 +23,13 @@
   public $id;
 
   /**
+   * The plugin weight.
+   *
+   * @var int
+   */
+  public $weight = 0;
+
+  /**
    * Any required context definitions.
    *
    * @var array
diff -u b/core/modules/layout_builder/src/SectionStorage/SectionStorageManager.php b/core/modules/layout_builder/src/SectionStorage/SectionStorageManager.php
--- b/core/modules/layout_builder/src/SectionStorage/SectionStorageManager.php
+++ b/core/modules/layout_builder/src/SectionStorage/SectionStorageManager.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\layout_builder\SectionStorage;
 
+use Drupal\Component\Utility\SortArray;
 use Drupal\Core\Cache\CacheBackendInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Plugin\Context\ContextAwarePluginManagerTrait;
@@ -44,0 +46,18 @@
+  protected function findDefinitions() {
+    $definitions = parent::findDefinitions();
+
+    uasort($definitions, function (SectionStorageDefinition $a, SectionStorageDefinition $b) {
+      $a = [
+        'weight' => $a->get('weight'),
+      ];
+      $b = [
+        'weight' => $b->get('weight'),
+      ];
+      return SortArray::sortByWeightElement($a, $b);
+    });
+    return $definitions;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
diff -u b/core/modules/layout_builder/tests/modules/layout_builder_test/layout_builder_test.module b/core/modules/layout_builder/tests/modules/layout_builder_test/layout_builder_test.module
--- b/core/modules/layout_builder/tests/modules/layout_builder_test/layout_builder_test.module
+++ b/core/modules/layout_builder/tests/modules/layout_builder_test/layout_builder_test.module
@@ -68,2 +68,3 @@
   $storages['overrides']->setClass(OverridesSectionStorage::class);
+  $storages['overrides']->set('weight', -10);
 }
diff -u b/core/modules/layout_builder/tests/src/Functional/LayoutBuilderTest.php b/core/modules/layout_builder/tests/src/Functional/LayoutBuilderTest.php
--- b/core/modules/layout_builder/tests/src/Functional/LayoutBuilderTest.php
+++ b/core/modules/layout_builder/tests/src/Functional/LayoutBuilderTest.php
@@ -546,6 +546,16 @@
     $this->getSession()->reload();
     $state->resetCache();
     $this->assertTrue($state->get($state_key));
+
+    // Test that plugin weights are respected.
+    /** @var \Drupal\layout_builder\SectionStorage\SectionStorageDefinition[] $definitions */
+    $definitions = $this->container
+      ->get('plugin.manager.layout_builder.section_storage')
+      ->getDefinitions();
+
+    $this->assertSame('overrides', key($definitions));
+    $this->assertSame(-10, $definitions['overrides']->get('weight'));
+    $this->assertSame(0, $definitions['defaults']->get('weight'));
   }
 
 }