diff --git a/src/Extensions/FileSubsites.php b/src/Extensions/FileSubsites.php
index ccbe183b..b2e47f85 100644
--- a/src/Extensions/FileSubsites.php
+++ b/src/Extensions/FileSubsites.php
@@ -107,7 +107,7 @@ protected function onAfterUpload()
         $this->owner->write();
     }
 
-    public function canEdit($member = null)
+    protected function canEdit($member = null)
     {
         // Opt out of making opinions if no subsite ID is set yet
         if (!$this->owner->SubsiteID) {
diff --git a/src/Extensions/GroupSubsites.php b/src/Extensions/GroupSubsites.php
index 469622dc..e214f3c3 100644
--- a/src/Extensions/GroupSubsites.php
+++ b/src/Extensions/GroupSubsites.php
@@ -43,7 +43,7 @@ class GroupSubsites extends DataExtension implements PermissionProvider
     /**
      * Migrations for GroupSubsites data.
      */
-    public function requireDefaultRecords()
+    protected function onRequireDefaultRecords()
     {
         if (!$this->owner) {
             return;
diff --git a/src/Extensions/LeftAndMainSubsites.php b/src/Extensions/LeftAndMainSubsites.php
index 733b092d..2c9eb3ba 100644
--- a/src/Extensions/LeftAndMainSubsites.php
+++ b/src/Extensions/LeftAndMainSubsites.php
@@ -41,7 +41,7 @@ class LeftAndMainSubsites extends LeftAndMainExtension
      */
     private static $treats_subsite_0_as_global = false;
 
-    public function init()
+    protected function onInit()
     {
         Requirements::css('silverstripe/subsites:client/dist/styles/LeftAndMain_Subsites.css');
         Requirements::javascript('silverstripe/subsites:client/dist/js/LeftAndMain_Subsites.js');
@@ -223,7 +223,7 @@ public function shouldChangeSubsite($adminClass, $recordSubsiteID, $currentSubsi
      *
      * @param Member $member
      */
-    public function canAccess(Member $member = null)
+    protected function canAccess(Member $member = null)
     {
         if (!$member) {
             $member = Security::getCurrentUser();
@@ -253,7 +253,7 @@ public function canAccess(Member $member = null)
      */
     public function alternateAccessCheck(Member $member = null)
     {
-        return $this->owner->canAccess($member);
+        return $this->canAccess($member);
     }
 
     /**
@@ -345,7 +345,7 @@ protected function onBeforeInit()
 
         // SECOND, check if we need to change subsites due to lack of permissions.
 
-        if (!$this->owner->canAccess()) {
+        if (!$this->canAccess()) {
             $member = Security::getCurrentUser();
 
             // Current section is not accessible, try at least to stick to the same subsite.
diff --git a/src/Extensions/SiteTreeSubsites.php b/src/Extensions/SiteTreeSubsites.php
index 94008cd7..2d199b4f 100644
--- a/src/Extensions/SiteTreeSubsites.php
+++ b/src/Extensions/SiteTreeSubsites.php
@@ -316,7 +316,7 @@ protected function alternateSiteConfig()
      * @param Member|null $member
      * @return bool|null
      */
-    public function canEdit($member = null)
+    protected function canEdit($member = null)
     {
         if (!$member) {
             $member = Security::getCurrentUser();
@@ -351,7 +351,7 @@ public function canEdit($member = null)
      * @param null $member
      * @return bool
      */
-    public function canDelete($member = null)
+    protected function canDelete($member = null)
     {
         if (!$member && $member !== false) {
             $member = Security::getCurrentUser();
@@ -364,7 +364,7 @@ public function canDelete($member = null)
      * @param null $member
      * @return bool
      */
-    public function canAddChildren($member = null)
+    protected function canAddChildren($member = null)
     {
         if (!$member && $member !== false) {
             $member = Security::getCurrentUser();
@@ -377,7 +377,7 @@ public function canAddChildren($member = null)
      * @param Member|null $member
      * @return bool|null
      */
-    public function canPublish($member = null)
+    protected function canPublish($member = null)
     {
         if (!$member && $member !== false) {
             $member = Security::getCurrentUser();
@@ -445,7 +445,7 @@ protected function updatePreviewLink(&$link, $action = null)
      * @param $tags
      * @return string
      */
-    public function MetaTags(&$tags)
+    protected function updateMetaTags(&$tags)
     {
         if ($this->owner->SubsiteID) {
             $tags .= '<meta name="x-subsite-id" content="' . $this->owner->SubsiteID . "\" />\n";
@@ -527,7 +527,7 @@ protected function cacheKeyComponent()
      * @param Member $member
      * @return boolean|null
      */
-    public function canCreate($member = null)
+    protected function canCreate($member = null)
     {
         // Typically called on a singleton, so we're not using the Subsite() relation
         $subsite = Subsite::currentSubsite();