diff --git a/commands/core/cache.drush.inc b/commands/core/cache.drush.inc
index f911f915e1..c7ed4c92c8 100644
--- a/commands/core/cache.drush.inc
+++ b/commands/core/cache.drush.inc
@@ -1,6 +1,7 @@
 <?php
 
 use Drupal\Core\DrupalKernel;
+use Drupal\Core\Site\Settings;
 use Symfony\Component\HttpFoundation\Request;
 
 /**
@@ -75,7 +76,7 @@ function cache_drush_command() {
     // do the same
     'options' => array(),
     'arguments' => array(),
-    'bootstrap' => DRUSH_BOOTSTRAP_DRUPAL_CONFIGURATION,
+    'bootstrap' => DRUSH_BOOTSTRAP_DRUPAL_ROOT,
     'core' => array('8+'),
     'aliases' => array('cr', 'rebuild'),
   );
@@ -245,20 +246,25 @@ function drush_cache_clear_drush() {
 
 /**
  * Rebuild a Drupal 8 site.
+ *
+ * This is a transpose of core/rebuild.php. Additionally
+ * it also clears drush cache and drupal render cache.
  */
 function drush_cache_rebuild() {
-  $drupal_core = drush_get_context('DRUSH_DRUPAL_CORE');
-  chdir(dirname($drupal_core));
-  $autoloader = require  $drupal_core . '/vendor/autoload.php';
-  require_once $drupal_core . '/includes/utility.inc';
+  chdir(DRUPAL_ROOT);
+  $autoloader = drush_drupal_load_autoloader(DRUPAL_ROOT);
+  require_once DRUSH_DRUPAL_CORE . '/includes/utility.inc';
 
   $request = Request::createFromGlobals();
-// Manually resemble early bootstrap of DrupalKernel::boot().
-  require_once $drupal_core . '/includes/bootstrap.inc';
+  // Manually resemble early bootstrap of DrupalKernel::boot().
+  require_once DRUSH_DRUPAL_CORE . '/includes/bootstrap.inc';
   DrupalKernel::bootEnvironment();
+  Settings::initialize(DrupalKernel::findSitePath($request), $autoloader);
 
   // drupal_rebuild() calls drupal_flush_all_caches() itself, so we don't do it manually.
   drupal_rebuild($autoloader, $request);
+  drush_log(dt('Cache rebuild complete.'), 'ok');
+
   // As this command replaces `drush cache-clear all` for Drupal 8 users, clear
   // the Drush cache as well, for consistency with that behavior.
   drush_cache_clear_drush();
@@ -267,3 +273,4 @@ function drush_cache_rebuild() {
   drush_include_engine('drupal', 'cache', drush_drupal_major_version());
   drush_cache_clear_render();
 }
+
diff --git a/includes/drupal.inc b/includes/drupal.inc
index c4db5192c6..4d8f3fbcad 100644
--- a/includes/drupal.inc
+++ b/includes/drupal.inc
@@ -5,6 +5,17 @@
  * Utility functions related to Drupal.
  */
 
+/**
+ * Loads the Drupal autoloader and returns the instance.
+ */
+function drush_drupal_load_autoloader($drupal_root) {
+  static $autoloader = FALSE;
+  if (!$autoloader) {
+    $autoloader = require_once $drupal_root .'/core/vendor/autoload.php';
+  }
+  return $autoloader;
+}
+
 /**
  * Detects the version number of the current Drupal installation,
  * if any. Returns FALSE if there is no current Drupal installation,
@@ -19,30 +30,31 @@ function drush_drupal_version($drupal_root = NULL) {
 
   if (!$version) {
     if (($drupal_root != NULL) || ($drupal_root = drush_get_context('DRUSH_DRUPAL_ROOT'))) {
-      // D7 stores VERSION in bootstrap.inc.
-      $version_constant_paths = array('/includes/bootstrap.inc', '/modules/system/system.module');
-      foreach ($version_constant_paths as $path) {
-        if (file_exists($drupal_root . $path)) {
-          require_once $drupal_root . $path;
-          if (defined('VERSION')) {
-            $version = VERSION;
-            break;
-          }
-        }
-      }
-      // We just might be dealing with an early Drupal version (pre 4.7)
-      if (defined('VERSION')) {
-        $version = VERSION;
-      }
-      elseif (file_exists($drupal_root . '/core/vendor/autoload.php')) {
+      // Try and find D8.
+      if (file_exists($drupal_root . '/core/vendor/autoload.php')) {
+        drush_include_engine('drupal', 'environment');
         // Load the autoloader so we can access the class constants.
-        require_once $drupal_root .'/core/vendor/autoload.php';
-        // Drush depends on bootstrap being loaded at this point;
+        drush_drupal_load_autoloader($drupal_root);
+        // Drush depends on bootstrap being loaded at this point.
         require_once $drupal_root .'/core/includes/bootstrap.inc';
         if (defined('Drupal::VERSION')) {
           $version = Drupal::VERSION;
         }
       }
+      else {
+        // D7 stores VERSION in bootstrap.inc.
+        // D6 and below does it in system.module.
+        $version_constant_paths = array('/includes/bootstrap.inc', '/modules/system/system.module');
+        foreach ($version_constant_paths as $path) {
+          if (file_exists($drupal_root . $path)) {
+            require_once $drupal_root . $path;
+            if (defined('VERSION')) {
+              $version = VERSION;
+              break;
+            }
+          }
+        }
+      }
     }
   }
   return $version;