diff --git a/core/tests/Drupal/FunctionalTests/Theme/ClaroLayoutBuilderTest.php b/core/tests/Drupal/FunctionalTests/Theme/ClaroLayoutBuilderTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..a198c110ea49fdaa3051905d6293a2e553d2fd85
--- /dev/null
+++ b/core/tests/Drupal/FunctionalTests/Theme/ClaroLayoutBuilderTest.php
@@ -0,0 +1,111 @@
+<?php
+
+namespace Drupal\FunctionalTests\Theme;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests the layout builder with the Claro theme.
+ *
+ * @group claro
+ */
+class ClaroLayoutBuilderTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'claro';
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'views',
+    'layout_builder',
+    'layout_builder_views_test',
+    'layout_test',
+    'block',
+    'block_test',
+    'node',
+    'layout_builder_test',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalPlaceBlock('local_tasks_block', ['region' => 'header']);
+
+    // Create two nodes.
+    $this->createContentType([
+      'type' => 'bundle_with_section_field',
+      'name' => 'Bundle with section field',
+    ]);
+    $this->createNode([
+      'type' => 'bundle_with_section_field',
+      'title' => 'The first node title',
+      'body' => [
+        [
+          'value' => 'The first node body',
+        ],
+      ],
+    ]);
+    $this->createNode([
+      'type' => 'bundle_with_section_field',
+      'title' => 'The second node title',
+      'body' => [
+        [
+          'value' => 'The second node body',
+        ],
+      ],
+    ]);
+  }
+
+  /**
+   * Tests the layout builder has expected contextual links with Claro.
+   *
+   * @see claro.theme
+   */
+  public function testContextualLinks() {
+    $assert_session = $this->assertSession();
+    $page = $this->getSession()->getPage();
+
+    $this->drupalLogin($this->drupalCreateUser([
+      'configure any layout',
+      'administer node display',
+      'administer node fields',
+      'access contextual links',
+    ]));
+
+    $field_ui_prefix = 'admin/structure/types/manage/bundle_with_section_field';
+
+    // From the manage display page, go to manage the layout.
+    $this->drupalGet("$field_ui_prefix/display/default");
+    $assert_session->linkNotExists('Manage layout');
+    $assert_session->fieldDisabled('layout[allow_custom]');
+
+    $this->drupalPostForm(NULL, ['layout[enabled]' => TRUE], 'Save');
+    $assert_session->linkExists('Manage layout');
+    $this->clickLink('Manage layout');
+
+    // Add a new block.
+    $assert_session->linkExists('Add block');
+    $this->clickLink('Add block');
+    $assert_session->linkExists('Powered by Drupal');
+    $this->clickLink('Powered by Drupal');
+    $page->fillField('settings[label]', 'This is the label');
+    $page->checkField('settings[label_display]');
+    $page->pressButton('Add block');
+
+    // Test that the block has the contextual class applied and the container
+    // for contextual links.
+    $assert_session->elementExists('css', 'div.block-system-powered-by-block.contextual-region div[data-contextual-id]');
+
+    // Ensure other blocks do not have contextual links.
+    $assert_session->elementExists('css', 'div.block-page-title-block');
+    $assert_session->elementNotExists('css', 'div.block-page-title-block.contextual-region div[data-contextual-id]');
+  }
+
+}
diff --git a/core/tests/Drupal/FunctionalTests/Theme/SevenLayoutBuilderTest.php b/core/tests/Drupal/FunctionalTests/Theme/SevenLayoutBuilderTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..ff668895813da71266f6a1e2bc7ac8121c1d08c5
--- /dev/null
+++ b/core/tests/Drupal/FunctionalTests/Theme/SevenLayoutBuilderTest.php
@@ -0,0 +1,112 @@
+<?php
+
+namespace Drupal\FunctionalTests\Theme;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests the Seven theme.
+ *
+ * @group seven
+ */
+class SevenLayoutBuilderTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'seven';
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'views',
+    'layout_builder',
+    'layout_builder_views_test',
+    'layout_test',
+    'block',
+    'block_test',
+    'node',
+    'layout_builder_test',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalPlaceBlock('page_title_block', ['region' => 'header']);
+    $this->drupalPlaceBlock('local_tasks_block', ['region' => 'header']);
+
+    // Create two nodes.
+    $this->createContentType([
+      'type' => 'bundle_with_section_field',
+      'name' => 'Bundle with section field',
+    ]);
+    $this->createNode([
+      'type' => 'bundle_with_section_field',
+      'title' => 'The first node title',
+      'body' => [
+        [
+          'value' => 'The first node body',
+        ],
+      ],
+    ]);
+    $this->createNode([
+      'type' => 'bundle_with_section_field',
+      'title' => 'The second node title',
+      'body' => [
+        [
+          'value' => 'The second node body',
+        ],
+      ],
+    ]);
+  }
+
+  /**
+   * Tests the layout builder has expected contextual links with Seven.
+   *
+   * @see seven.theme
+   */
+  public function testContextualLinks() {
+    $assert_session = $this->assertSession();
+    $page = $this->getSession()->getPage();
+
+    $this->drupalLogin($this->drupalCreateUser([
+      'configure any layout',
+      'administer node display',
+      'administer node fields',
+      'access contextual links',
+    ]));
+
+    $field_ui_prefix = 'admin/structure/types/manage/bundle_with_section_field';
+
+    // From the manage display page, go to manage the layout.
+    $this->drupalGet("$field_ui_prefix/display/default");
+    $assert_session->linkNotExists('Manage layout');
+    $assert_session->fieldDisabled('layout[allow_custom]');
+
+    $this->drupalPostForm(NULL, ['layout[enabled]' => TRUE], 'Save');
+    $assert_session->linkExists('Manage layout');
+    $this->clickLink('Manage layout');
+
+    // Add a new block.
+    $assert_session->linkExists('Add block');
+    $this->clickLink('Add block');
+    $assert_session->linkExists('Powered by Drupal');
+    $this->clickLink('Powered by Drupal');
+    $page->fillField('settings[label]', 'This is the label');
+    $page->checkField('settings[label_display]');
+    $page->pressButton('Add block');
+
+    // Test that the block has the contextual class applied and the container
+    // for contextual links.
+    $assert_session->elementExists('css', 'div.block-system-powered-by-block.contextual-region div[data-contextual-id]');
+
+    // Ensure other blocks do not have contextual links.
+    $assert_session->elementExists('css', 'div.block-page-title-block');
+    $assert_session->elementNotExists('css', 'div.block-page-title-block.contextual-region div[data-contextual-id]');
+  }
+
+}
diff --git a/core/themes/claro/claro.theme b/core/themes/claro/claro.theme
index bc6bcfed7b0f926f56f533303ec2f6dcc61c26c7..df810f09b8fbf2309a433d64841c20511d103758 100644
--- a/core/themes/claro/claro.theme
+++ b/core/themes/claro/claro.theme
@@ -175,10 +175,10 @@ function claro_preprocess_entity_add_list(&$variables) {
 /**
  * Implements hook_preprocess_block() for block content.
  *
- * Disables contextual links for all blocks.
+ * Disables contextual links for all blocks except for layout builder blocks.
  */
 function claro_preprocess_block(&$variables) {
-  if (isset($variables['title_suffix']['contextual_links'])) {
+  if (isset($variables['title_suffix']['contextual_links']) && !isset($variables['elements']['#contextual_links']['layout_builder_block'])) {
     unset($variables['title_suffix']['contextual_links']);
     unset($variables['elements']['#contextual_links']);
 
diff --git a/core/themes/seven/seven.theme b/core/themes/seven/seven.theme
index 740f1bd28d6fb3e9982708c6b93081a836384b71..08a594b5a53388d69769be1851d0990a748935be 100644
--- a/core/themes/seven/seven.theme
+++ b/core/themes/seven/seven.theme
@@ -89,10 +89,10 @@ function seven_preprocess_block_content_add_list(&$variables) {
 /**
  * Implements hook_preprocess_block() for block content.
  *
- * Disables contextual links for all blocks.
+ * Disables contextual links for all blocks except for layout builder blocks.
  */
 function seven_preprocess_block(&$variables) {
-  if (isset($variables['title_suffix']['contextual_links'])) {
+  if (isset($variables['title_suffix']['contextual_links']) && !isset($variables['elements']['#contextual_links']['layout_builder_block'])) {
     unset($variables['title_suffix']['contextual_links']);
     unset($variables['elements']['#contextual_links']);