diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index cfc0497bbc..c35008ad68 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -6,6 +6,9 @@
  */
 
 use Drupal\Component\Utility\UrlHelper;
+use Drupal\Core\Config\ConfigImporter;
+use Drupal\Core\Config\ConfigImporterException;
+use Drupal\Core\Config\StorageComparer;
 use Drupal\Core\DrupalKernel;
 use Drupal\Core\Database\Database;
 use Drupal\Core\Database\DatabaseExceptionWrapper;
@@ -188,6 +191,12 @@ function install_state_defaults() {
     // The last task that was completed during the previous installation
     // request.
     'completed_task' => NULL,
+    // Partial configuration cached during an installation from existing config.
+    'config' => NULL,
+    // TRUE when installing from existing configuration.
+    'config_install' => FALSE,
+      // The path to the configuration to install when installing from config.
+    'profile_sync' => NULL,
     // TRUE when there are valid config directories.
     'config_verified' => FALSE,
     // TRUE when there is a valid database connection.
@@ -445,10 +454,16 @@ function install_begin_request($class_loader, &$install_state) {
     }
   }
 
-  // Use the language from the profile configuration, if available, to override
-  // the language previously set in the parameters.
-  if (isset($install_state['profile_info']['distribution']['langcode'])) {
-    $install_state['parameters']['langcode'] = $install_state['profile_info']['distribution']['langcode'];
+  // Use the language from profile configuration if available.
+  if (!empty($install_state['config_install']) && $install_state['config']['system.site']) {
+    $install_state['parameters']['langcode'] = $install_state['config']['system.site']['default_langcode'];
+  }
+  else {
+    // Otherwise, Use the language from the profile configuration, if available,
+    // to override the language previously set in the parameters.
+    if (isset($install_state['profile_info']['distribution']['langcode'])) {
+      $install_state['parameters']['langcode'] = $install_state['profile_info']['distribution']['langcode'];
+    }
   }
 
   // Set the default language to the selected language, if any.
@@ -787,6 +802,33 @@ function install_tasks($install_state) {
     ],
   ];
 
+  if (!empty($install_state['config_install'])) {
+    // The chosen profile indicates that rather than installing a new site, an
+    // instance of the same site should be installed from the given
+    // configuration.
+    // That means we need to remove the steps installing the extensions and
+    // replace them with a configuration synchronisation step.
+    unset($tasks['install_download_translation']);
+    $key = array_search('install_profile_modules', array_keys($tasks), TRUE);
+    unset($tasks['install_profile_modules']);
+    unset($tasks['install_profile_themes']);
+    unset($tasks['install_install_profile']);
+    $config_tasks = [
+      'drupal_install_config_directories' => [
+        'run' => empty($install_state['profile_sync']) ? INSTALL_TASK_SKIP : INSTALL_TASK_RUN_IF_NOT_COMPLETED,
+      ],
+      'install_config_import_batch' => [
+        'display_name' => t('Install configuration'),
+        'type' => 'batch',
+      ],
+      'install_config_download_translations' => [],
+      'install_config_fix_profile' => [],
+    ];
+    $tasks = array_slice($tasks, 0, $key, TRUE) +
+      $config_tasks +
+      array_slice($tasks, $key, NULL, TRUE);
+  }
+
   // Now add any tasks defined by the installation profile.
   if (!empty($install_state['parameters']['profile'])) {
     // Load the profile install file, because it is not always loaded when
@@ -1461,9 +1503,25 @@ function _install_get_version_info($version) {
  *   profile information will be added here.
  */
 function install_load_profile(&$install_state) {
+  global $config_directories;
+
   $profile = $install_state['parameters']['profile'];
   $install_state['profiles'][$profile]->load();
   $install_state['profile_info'] = install_profile_info($profile, isset($install_state['parameters']['langcode']) ? $install_state['parameters']['langcode'] : 'en');
+  if (!empty($install_state['profile_info']['config_install']) && !empty($config_directories[CONFIG_SYNC_DIRECTORY])) {
+    $install_state['config_install'] = TRUE;
+    $install_state['config']['system.site'] = \Drupal::service('config.storage.sync')->read('system.site');
+  }
+  elseif (!empty($install_state['profile_info']['profile_sync'])) {
+    // If the profile has a config/sync directory copy the information to the
+    // install_state global.
+    $install_state['config_install'] = TRUE;
+    $install_state['profile_sync'] = $install_state['profile_info']['profile_sync'];
+
+    if (!empty($install_state['profile_info']['config'])) {
+      $install_state['config'] = $install_state['profile_info']['config'];
+    }
+  }
 }
 
 /**
@@ -2217,3 +2275,194 @@ function install_write_profile($install_state) {
     throw new InstallProfileMismatchException($install_state['parameters']['profile'], $settings_profile, $settings_path, \Drupal::translation());
   }
 }
+
+/**
+ * Creates a batch for the config importer to process.
+ *
+ * @see install_tasks()
+ */
+function install_config_import_batch() {
+  // We need to manually trigger the installation of core-provided entity types,
+  // as those will not be handled by the module installer.
+  // @see install_profile_modules()
+  install_core_entity_type_definitions();
+
+  // Get the sync storage.
+  $sync = \Drupal::service('config.storage.sync');
+  // Match up the site uuids, the install_base_system install task will have
+  // installed the system module and created a new UUID.
+  $system_site = $sync->read('system.site');
+  \Drupal::configFactory()->getEditable('system.site')->set('uuid', $system_site['uuid'])->save();
+
+  // Create the storage comparer and the config importer.
+  $config_manager = \Drupal::service('config.manager');
+  $storage_comparer = new StorageComparer($sync, \Drupal::service('config.storage'), $config_manager);
+  $storage_comparer->createChangelist();
+  $config_importer = new ConfigImporter(
+    $storage_comparer,
+    \Drupal::service('event_dispatcher'),
+    $config_manager,
+    \Drupal::service('lock.persistent'),
+    \Drupal::service('config.typed'),
+    \Drupal::service('module_handler'),
+    \Drupal::service('module_installer'),
+    \Drupal::service('theme_handler'),
+    \Drupal::service('string_translation')
+  );
+
+  try {
+    $sync_steps = $config_importer->initialize();
+
+    $batch = [
+      'operations' => [],
+      'finished' => 'install_config_import_batch_finish',
+      'title' => t('Synchronizing configuration'),
+      'init_message' => t('Starting configuration synchronization.'),
+      'progress_message' => t('Completed @current step of @total.'),
+      'error_message' => t('Configuration synchronization has encountered an error.'),
+      'file' => drupal_get_path('module', 'config') . '/config.admin.inc',
+    ];
+    foreach ($sync_steps as $sync_step) {
+      $batch['operations'][] = ['install_config_import_batch_process', [$config_importer, $sync_step]];
+    }
+
+    return $batch;
+  }
+  catch (ConfigImporterException $e) {
+    global $install_state;
+    // There are validation errors.
+    drupal_set_message(t('The configuration synchronization failed validation.'), 'error');
+    foreach ($config_importer->getErrors() as $message) {
+      drupal_set_message($message, 'error');
+    }
+    install_display_output(['#title' => t('Configuration validation')], $install_state);
+  }
+}
+
+/**
+ * Processes the config import batch and persists the importer.
+ *
+ * @param \Drupal\Core\Config\ConfigImporter $config_importer
+ *   The batch config importer object to persist.
+ * @param string $sync_step
+ *   The synchronisation step to do.
+ * @param $context
+ *   The batch context.
+ *
+ * @see install_config_import_batch()
+ */
+function install_config_import_batch_process(ConfigImporter $config_importer, $sync_step, &$context) {
+  if (!isset($context['sandbox']['config_importer'])) {
+    $context['sandbox']['config_importer'] = $config_importer;
+  }
+
+  $config_importer = $context['sandbox']['config_importer'];
+  $config_importer->doSyncStep($sync_step, $context);
+  if ($errors = $config_importer->getErrors()) {
+    if (!isset($context['results']['errors'])) {
+      $context['results']['errors'] = [];
+    }
+    $context['results']['errors'] += $errors;
+  }
+}
+
+/**
+ * Finish config importer batch.
+ *
+ * @see install_config_import_batch()
+ */
+function install_config_import_batch_finish($success, $results, $operations) {
+  if ($success) {
+    if (!empty($results['errors'])) {
+      foreach ($results['errors'] as $error) {
+        drupal_set_message($error, 'error');
+        \Drupal::logger('config_sync')->error($error);
+      }
+      drupal_set_message(t('The configuration was imported with errors.'), 'warning');
+    }
+    else {
+      // Configuration sync needs a complete cache flush.
+      drupal_flush_all_caches();
+    }
+  }
+  else {
+    // An error occurred.
+    // $operations contains the operations that remained unprocessed.
+    $error_operation = reset($operations);
+    $message = t('An error occurred while processing %error_operation with arguments: @arguments', [
+      '%error_operation' => $error_operation[0],
+      // The arguments are usually added with print_r which does not handle
+      // circular references very well. All operations use the $config_importer.
+      '@arguments' => sprintf('%s::%s', get_class($error_operation[1][0]), $error_operation[1][1])
+    ]);
+    drupal_set_message($message, 'error');
+  }
+}
+
+
+/**
+ * Replaces install_download_translation() during configuration installs.
+ *
+ * @param array $install_state
+ *   An array of information about the current installation state.
+ *
+ * @return string
+ *   A themed status report, or an exception if there are requirement errors.
+ *   Upon successful download the page is reloaded and no output is returned.
+ *
+ * @see install_download_translation()
+ */
+function install_config_download_translations(&$install_state) {
+  $needs_download = isset($install_state['parameters']['langcode']) && !isset($install_state['translations'][$install_state['parameters']['langcode']]) && $install_state['parameters']['langcode'] !== 'en';
+  if ($needs_download) {
+    return install_download_translation($install_state);
+  }
+}
+
+
+/**
+ * Fixes configuration if the install profile has made changes in hook_install().
+ */
+function install_config_fix_profile() {
+  global $install_state;
+  // It is possible that installing the profile makes unintended configuration
+  // changes.
+  $config_manager = \Drupal::service('config.manager');
+  $storage_comparer = new StorageComparer(\Drupal::service('config.storage.sync'), \Drupal::service('config.storage'), $config_manager);
+  $storage_comparer->createChangelist();
+  if ($storage_comparer->hasChanges()) {
+    $config_importer = new ConfigImporter(
+      $storage_comparer,
+      \Drupal::service('event_dispatcher'),
+      $config_manager,
+      \Drupal::service('lock.persistent'),
+      \Drupal::service('config.typed'),
+      \Drupal::service('module_handler'),
+      \Drupal::service('module_installer'),
+      \Drupal::service('theme_handler'),
+      \Drupal::service('string_translation')
+    );
+    try {
+      $config_importer->import();
+    }
+    catch (ConfigImporterException $e) {
+      global $install_state;
+      // There are validation errors.
+      drupal_set_message(t('The configuration synchronization failed validation.'), 'error');
+      foreach ($config_importer->getErrors() as $message) {
+        drupal_set_message($message, 'error');
+      }
+      install_display_output(['#title' => t('Configuration validation')], $install_state);
+    }
+
+    // At this point the configuration should match completely.
+    if (\Drupal::moduleHandler()->moduleExists('language')) {
+      // If the English language exists at this point we need to ensure
+      // install_download_additional_translations_operations() does not delete
+      // it.
+      if (ConfigurableLanguage::load('en')) {
+        $install_state['profile_info']['keep_english'] = TRUE;
+      }
+    }
+  }
+}
diff --git a/core/includes/install.inc b/core/includes/install.inc
index c5b93b58a6..5ba241bbf0 100644
--- a/core/includes/install.inc
+++ b/core/includes/install.inc
@@ -10,6 +10,7 @@
 use Drupal\Component\Utility\Crypt;
 use Drupal\Component\Utility\OpCodeCache;
 use Drupal\Component\Utility\UrlHelper;
+use Drupal\Core\Config\FileStorage;
 use Drupal\Core\Extension\ExtensionDiscovery;
 use Drupal\Core\Site\Settings;
 
@@ -482,12 +483,20 @@ function _drupal_rewrite_settings_dump_one(\stdClass $variable, $prefix = '', $s
  * @see update_prepare_d8_bootstrap()
  */
 function drupal_install_config_directories() {
-  global $config_directories;
+  global $config_directories, $install_state;
 
-  // Add a randomized config directory name to settings.php, unless it was
-  // manually defined in the existing already.
+  // If settings.php does not contain a config sync directory name we need to
+  // configure one.
   if (empty($config_directories[CONFIG_SYNC_DIRECTORY])) {
-    $config_directories[CONFIG_SYNC_DIRECTORY] = \Drupal::service('site.path') . '/files/config_' . Crypt::randomBytesBase64(55) . '/sync';
+    if (empty($install_state['profile_sync'])) {
+      // Add a randomized config directory name to settings.php
+      $config_directories[CONFIG_SYNC_DIRECTORY] = \Drupal::service('site.path') . '/files/config_' . Crypt::randomBytesBase64(55) . '/sync';
+    }
+    else {
+      // Install profiles can contain a config sync directory. If they do,
+      // 'profile_sync' is a path to the directory.
+      $config_directories[CONFIG_SYNC_DIRECTORY] = $install_state['profile_sync'];
+    }
     $settings['config_directories'][CONFIG_SYNC_DIRECTORY] = (object) [
       'value' => $config_directories[CONFIG_SYNC_DIRECTORY],
       'required' => TRUE,
@@ -1090,6 +1099,13 @@ function install_profile_info($profile, $langcode = 'en') {
 
     $info['dependencies'] = array_unique(array_merge($required, $info['dependencies'], $locale));
 
+    // If the profile has a config/sync directory use that to install drupal.
+    $profile_path = drupal_get_path('profile', $profile);
+    if (is_dir($profile_path . '/config/sync')) {
+      $info['profile_sync'] = $profile_path . '/config/sync';
+      $sync = new FileStorage($profile_path . '/config/sync');
+      $info['config']['system.site'] = $sync->read('system.site');
+    }
     $cache[$profile][$langcode] = $info;
   }
   return $cache[$profile][$langcode];
diff --git a/core/lib/Drupal/Core/Config/ConfigImporter.php b/core/lib/Drupal/Core/Config/ConfigImporter.php
index 06fed4b1b0..25937e691e 100644
--- a/core/lib/Drupal/Core/Config/ConfigImporter.php
+++ b/core/lib/Drupal/Core/Config/ConfigImporter.php
@@ -405,6 +405,14 @@ protected function createExtensionChangelist() {
     $module_list = array_reverse($module_list);
     $this->extensionChangelist['module']['install'] = array_intersect(array_keys($module_list), $install);
 
+    // If we're installing the install profile ensure it comes last. This will
+    // when installing a site from configuration.
+    $install_profile_key = array_search($new_extensions['profile'], $this->extensionChangelist['module']['install'], TRUE);
+    if ($install_profile_key !== FALSE) {
+      unset($this->extensionChangelist['module']['install'][$install_profile_key]);
+      $this->extensionChangelist['module']['install'][] = $new_extensions['profile'];
+    }
+
     // Work out what themes to install and to uninstall.
     $this->extensionChangelist['theme']['install'] = array_keys(array_diff_key($new_extensions['theme'], $current_extensions['theme']));
     $this->extensionChangelist['theme']['uninstall'] = array_keys(array_diff_key($current_extensions['theme'], $new_extensions['theme']));
diff --git a/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php b/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
index c28b7f8fd4..0632ca9233 100644
--- a/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
+++ b/core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
@@ -118,6 +118,7 @@ protected function getEditableConfigNames() {
    * {@inheritdoc}
    */
   public function buildForm(array $form, FormStateInterface $form_state) {
+    global $install_state;
     $form['#title'] = $this->t('Configure site');
 
     // Warn about settings.php permissions risk
@@ -145,12 +146,14 @@ public function buildForm(array $form, FormStateInterface $form_state) {
     $form['site_information'] = [
       '#type' => 'fieldgroup',
       '#title' => $this->t('Site information'),
+      '#access' => empty($install_state['config_install']),
     ];
     $form['site_information']['site_name'] = [
       '#type' => 'textfield',
       '#title' => $this->t('Site name'),
       '#required' => TRUE,
       '#weight' => -20,
+      '#access' => empty($install_state['config_install']),
     ];
     $form['site_information']['site_mail'] = [
       '#type' => 'email',
@@ -159,6 +162,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#description' => $this->t("Automated emails, such as registration information, will be sent from this address. Use an address ending in your site's domain to help prevent these emails from being flagged as spam."),
       '#required' => TRUE,
       '#weight' => -15,
+      '#access' => empty($install_state['config_install']),
     ];
 
     $form['admin_account'] = [
@@ -188,6 +192,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
     $form['regional_settings'] = [
       '#type' => 'fieldgroup',
       '#title' => $this->t('Regional settings'),
+      '#access' => empty($install_state['config_install']),
     ];
     $countries = $this->countryManager->getList();
     $form['regional_settings']['site_default_country'] = [
@@ -198,6 +203,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#options' => $countries,
       '#description' => $this->t('Select the default country for the site.'),
       '#weight' => 0,
+      '#access' => empty($install_state['config_install']),
     ];
     $form['regional_settings']['date_default_timezone'] = [
       '#type' => 'select',
@@ -208,17 +214,20 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#description' => $this->t('By default, dates in this site will be displayed in the chosen time zone.'),
       '#weight' => 5,
       '#attributes' => ['class' => ['timezone-detect']],
+      '#access' => empty($install_state['config_install']),
     ];
 
     $form['update_notifications'] = [
       '#type' => 'fieldgroup',
       '#title' => $this->t('Update notifications'),
       '#description' => $this->t('The system will notify you when updates and important security releases are available for installed components. Anonymous information about your site is sent to <a href=":drupal">Drupal.org</a>.', [':drupal' => 'https://www.drupal.org']),
+      '#access' => empty($install_state['config_install']),
     ];
     $form['update_notifications']['enable_update_status_module'] = [
       '#type' => 'checkbox',
       '#title' => $this->t('Check for updates automatically'),
       '#default_value' => 1,
+      '#access' => empty($install_state['config_install']),
     ];
     $form['update_notifications']['enable_update_status_emails'] = [
       '#type' => 'checkbox',
@@ -229,6 +238,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
           'input[name="enable_update_status_module"]' => ['checked' => TRUE],
         ],
       ],
+      '#access' => empty($install_state['config_install']),
     ];
 
     $form['actions'] = ['#type' => 'actions'];
@@ -255,21 +265,25 @@ public function validateForm(array &$form, FormStateInterface $form_state) {
    * {@inheritdoc}
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
-    $this->config('system.site')
-      ->set('name', (string) $form_state->getValue('site_name'))
-      ->set('mail', (string) $form_state->getValue('site_mail'))
-      ->save(TRUE);
+    global $install_state;
 
-    $this->config('system.date')
-      ->set('timezone.default', (string) $form_state->getValue('date_default_timezone'))
-      ->set('country.default', (string) $form_state->getValue('site_default_country'))
-      ->save(TRUE);
+    if (empty($install_state['config_install'])) {
+      $this->config('system.site')
+        ->set('name', (string) $form_state->getValue('site_name'))
+        ->set('mail', (string) $form_state->getValue('site_mail'))
+        ->save(TRUE);
+
+      $this->config('system.date')
+        ->set('timezone.default', (string) $form_state->getValue('date_default_timezone'))
+        ->set('country.default', (string) $form_state->getValue('site_default_country'))
+        ->save(TRUE);
+    }
 
     $account_values = $form_state->getValue('account');
 
     // Enable update.module if this option was selected.
     $update_status_module = $form_state->getValue('enable_update_status_module');
-    if ($update_status_module) {
+    if (empty($install_state['config_install']) && $update_status_module) {
       $this->moduleInstaller->install(['file', 'update'], FALSE);
 
       // Add the site maintenance account's email address to the list of