diff --git a/core/modules/layout_builder/config/schema/layout_builder.schema.yml b/core/modules/layout_builder/config/schema/layout_builder.schema.yml
index 7faad99c24..329e5bb590 100644
--- a/core/modules/layout_builder/config/schema/layout_builder.schema.yml
+++ b/core/modules/layout_builder/config/schema/layout_builder.schema.yml
@@ -28,6 +28,11 @@ layout_builder.section:
       label: 'Components'
       sequence:
         type: layout_builder.component
+    third_party_settings:
+      type: sequence
+      label: 'Third party settings'
+      sequence:
+        type: '[%parent.%parent.%type].third_party.[%key]'
 
 layout_builder.component:
   type: mapping
@@ -47,6 +52,11 @@ layout_builder.component:
     additional:
       type: ignore
       label: 'Additional data'
+    third_party_settings:
+      type: sequence
+      label: 'Third party settings'
+      sequence:
+        type: '[%parent.%parent.%type].third_party.[%key]'
 
 inline_block:
   type: block_settings
diff --git a/core/modules/layout_builder/src/Section.php b/core/modules/layout_builder/src/Section.php
index 1ec0b8af10..73173c4087 100644
--- a/core/modules/layout_builder/src/Section.php
+++ b/core/modules/layout_builder/src/Section.php
@@ -2,6 +2,8 @@
 
 namespace Drupal\layout_builder;
 
+use Drupal\Core\Config\Entity\ThirdPartySettingsInterface;
+
 /**
  * Provides a domain object for layout sections.
  *
@@ -22,7 +24,9 @@
  * @todo Determine whether an interface will be provided for this in
  *   https://www.drupal.org/project/drupal/issues/2930334.
  */
-class Section {
+class Section implements ThirdPartySettingsInterface {
+
+  use ThirdPartySettingsTrait;
 
   /**
    * The layout plugin ID.
@@ -54,13 +58,16 @@ class Section {
    *   (optional) The layout plugin settings.
    * @param \Drupal\layout_builder\SectionComponent[] $components
    *   (optional) The components.
+   * @param array $third_party_settings
+   *   (optional) Any third party settings.
    */
-  public function __construct($layout_id, array $layout_settings = [], array $components = []) {
+  public function __construct($layout_id, array $layout_settings = [], array $components = [], array $third_party_settings = []) {
     $this->layoutId = $layout_id;
     $this->layoutSettings = $layout_settings;
     foreach ($components as $component) {
       $this->setComponent($component);
     }
+    $this->third_party_settings = $third_party_settings;
   }
 
   /**
@@ -334,6 +341,7 @@ public function toArray() {
       'components' => array_map(function (SectionComponent $component) {
         return $component->toArray();
       }, $this->getComponents()),
+      'third_party_settings' => $this->third_party_settings,
     ];
   }
 
@@ -349,10 +357,18 @@ public function toArray() {
    *   The section object.
    */
   public static function fromArray(array $section) {
+    // Ensure expected array keys are present.
+    $section += [
+      'layout_id' => '',
+      'layout_settings' => [],
+      'components' => [],
+      'third_party_settings' => [],
+    ];
     return new static(
       $section['layout_id'],
       $section['layout_settings'],
-      array_map([SectionComponent::class, 'fromArray'], $section['components'])
+      array_map([SectionComponent::class, 'fromArray'], $section['components']),
+      $section['third_party_settings']
     );
   }
 
diff --git a/core/modules/layout_builder/src/SectionComponent.php b/core/modules/layout_builder/src/SectionComponent.php
index 4937f7fbcd..25a06719c7 100644
--- a/core/modules/layout_builder/src/SectionComponent.php
+++ b/core/modules/layout_builder/src/SectionComponent.php
@@ -3,6 +3,7 @@
 namespace Drupal\layout_builder;
 
 use Drupal\Component\Plugin\Exception\PluginException;
+use Drupal\Core\Config\Entity\ThirdPartySettingsInterface;
 use Drupal\Core\Plugin\ContextAwarePluginInterface;
 use Drupal\layout_builder\Event\SectionComponentBuildRenderArrayEvent;
 
@@ -28,7 +29,9 @@
  * @todo Determine whether an interface will be provided for this in
  *   https://www.drupal.org/project/drupal/issues/2930334.
  */
-class SectionComponent {
+class SectionComponent implements ThirdPartySettingsInterface {
+
+  use ThirdPartySettingsTrait;
 
   /**
    * The UUID of the component.
@@ -76,12 +79,15 @@ class SectionComponent {
    *   The plugin configuration.
    * @param mixed[] $additional
    *   An additional values.
+   * @param array $third_party_settings
+   *   (optional) Any third party settings.
    */
-  public function __construct($uuid, $region, array $configuration = [], array $additional = []) {
+  public function __construct($uuid, $region, array $configuration = [], array $additional = [], array $third_party_settings = []) {
     $this->uuid = $uuid;
     $this->region = $region;
     $this->configuration = $configuration;
     $this->additional = $additional;
+    $this->third_party_settings = $third_party_settings;
   }
 
   /**
@@ -304,6 +310,7 @@ public function toArray() {
       'configuration' => $this->getConfiguration(),
       'additional' => $this->additional,
       'weight' => $this->getWeight(),
+      'third_party_settings' => $this->third_party_settings,
     ];
   }
 
@@ -319,11 +326,20 @@ public function toArray() {
    *   The section component object.
    */
   public static function fromArray(array $component) {
+    // Ensure expected array keys are present.
+    $component += [
+      'uuid' => '',
+      'region' => [],
+      'configuration' => [],
+      'additional' => [],
+      'third_party_settings' => [],
+    ];
     return (new static(
       $component['uuid'],
       $component['region'],
       $component['configuration'],
-      $component['additional']
+      $component['additional'],
+      $component['third_party_settings']
     ))->setWeight($component['weight']);
   }
 
diff --git a/core/modules/layout_builder/tests/fixtures/update/layout-builder-enable.php b/core/modules/layout_builder/tests/fixtures/update/layout-builder-enable.php
index fc69baae33..d770c6fd65 100644
--- a/core/modules/layout_builder/tests/fixtures/update/layout-builder-enable.php
+++ b/core/modules/layout_builder/tests/fixtures/update/layout-builder-enable.php
@@ -30,8 +30,10 @@
       ],
       'additional' => [],
       'weight' => 0,
+      'third_party_settings' => [],
     ],
   ],
+  'third_party_settings' => [],
 ];
 $connection->update('config')
   ->fields([
diff --git a/core/modules/layout_builder/tests/src/Functional/Update/LayoutBuilderEnableUpdatePathTest.php b/core/modules/layout_builder/tests/src/Functional/Update/LayoutBuilderEnableUpdatePathTest.php
index 5577539359..5cc1d38d2a 100644
--- a/core/modules/layout_builder/tests/src/Functional/Update/LayoutBuilderEnableUpdatePathTest.php
+++ b/core/modules/layout_builder/tests/src/Functional/Update/LayoutBuilderEnableUpdatePathTest.php
@@ -45,8 +45,10 @@ public function testRunUpdates() {
               ],
               'additional' => [],
               'weight' => 0,
+              'third_party_settings' => [],
             ],
           ],
+          'third_party_settings' => [],
         ],
       ],
     ];
diff --git a/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php b/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php
index 48a24778c1..c86dda230c 100644
--- a/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php
+++ b/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php
@@ -20,6 +20,8 @@
  */
 class SectionComponentTest extends UnitTestCase {
 
+  use ThirdPartySettingsTestTrait;
+
   /**
    * @covers ::toRenderArray
    */
@@ -68,4 +70,11 @@ public function testToRenderArray() {
     $this->assertEquals($expected, $result);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  private function getThirdPartySettingsObject() {
+    return new SectionComponent('', '', [], [], $this->initialThirdPartySettings);
+  }
+
 }
diff --git a/core/modules/layout_builder/tests/src/Unit/SectionTest.php b/core/modules/layout_builder/tests/src/Unit/SectionTest.php
index eff239507d..86aba110ec 100644
--- a/core/modules/layout_builder/tests/src/Unit/SectionTest.php
+++ b/core/modules/layout_builder/tests/src/Unit/SectionTest.php
@@ -12,6 +12,8 @@
  */
 class SectionTest extends UnitTestCase {
 
+  use ThirdPartySettingsTestTrait;
+
   /**
    * The section object to test.
    *
@@ -25,11 +27,16 @@ class SectionTest extends UnitTestCase {
   protected function setUp() {
     parent::setUp();
 
-    $this->section = new Section('layout_onecol', [], [
-      new SectionComponent('existing-uuid', 'some-region', ['id' => 'existing-block-id']),
-      (new SectionComponent('second-uuid', 'ordered-region', ['id' => 'second-block-id']))->setWeight(3),
-      (new SectionComponent('first-uuid', 'ordered-region', ['id' => 'first-block-id']))->setWeight(2),
-    ]);
+    $this->section = new Section(
+      'layout_onecol',
+      [],
+      [
+        new SectionComponent('existing-uuid', 'some-region', ['id' => 'existing-block-id']),
+        (new SectionComponent('second-uuid', 'ordered-region', ['id' => 'second-block-id']))->setWeight(3),
+        (new SectionComponent('first-uuid', 'ordered-region', ['id' => 'first-block-id']))->setWeight(2),
+      ],
+      $this->initialThirdPartySettings
+    );
   }
 
   /**
@@ -179,4 +186,11 @@ protected function assertComponents(array $expected, Section $section) {
     $this->assertSame(array_keys($expected), array_keys($result));
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  private function getThirdPartySettingsObject() {
+    return $this->section;
+  }
+
 }