diff --git a/administrator/components/com_templates/src/View/Template/HtmlView.php b/administrator/components/com_templates/src/View/Template/HtmlView.php
index f0b21dca56f24..b673a2c6614d1 100644
--- a/administrator/components/com_templates/src/View/Template/HtmlView.php
+++ b/administrator/components/com_templates/src/View/Template/HtmlView.php
@@ -258,7 +258,12 @@ protected function addToolbar()
 			// Add a copy template button
 			elseif ($this->type === 'home')
 			{
-				ToolbarHelper::modal('copyModal', 'icon-copy', 'COM_TEMPLATES_BUTTON_COPY_TEMPLATE');
+				$templatesPath = ((int) $this->template->client_id === 1 ? JPATH_ADMINISTRATOR : JPATH_SITE) . '/templates/';
+				$templateDetails = $templatesPath . $this->template->name . '/templateDetails.xml';
+				$templateXML = simplexml_load_file($templateDetails);
+				if ((string) $templateXML->namespace === '' || $templateXML->namespace === null) {
+					ToolbarHelper::modal('copyModal', 'icon-copy', 'COM_TEMPLATES_BUTTON_COPY_TEMPLATE');
+				}
 			}
 		}
 
diff --git a/libraries/namespacemap.php b/libraries/namespacemap.php
index 572a63c85576f..0210ea4d9657c 100644
--- a/libraries/namespacemap.php
+++ b/libraries/namespacemap.php
@@ -65,6 +65,7 @@ public function create()
 		$extensions = array_merge(
 			$this->getNamespaces('component'),
 			$this->getNamespaces('module'),
+			$this->getNamespaces('template'),
 			$this->getNamespaces('plugin'),
 			$this->getNamespaces('library')
 		);
@@ -139,7 +140,7 @@ protected function writeNamespaceFile($elements)
 	 */
 	private function getNamespaces(string $type): array
 	{
-		if (!in_array($type, ['component', 'module', 'plugin', 'library'], true))
+		if (!in_array($type, ['component', 'module', 'plugin', 'template', 'library'], true))
 		{
 			return [];
 		}
@@ -153,6 +154,10 @@ private function getNamespaces(string $type): array
 		{
 			$directories = [JPATH_SITE . '/modules', JPATH_ADMINISTRATOR . '/modules'];
 		}
+		elseif ($type === 'template')
+		{
+			$directories = [JPATH_SITE . '/templates', JPATH_ADMINISTRATOR . '/templates'];
+		}
 		elseif ($type === 'plugin')
 		{
 			$directories = Folder::folders(JPATH_PLUGINS, '.', false, true);
@@ -173,6 +178,7 @@ private function getNamespaces(string $type): array
 
 				// Strip the com_ from the extension name for components
 				$name = str_replace('com_', '', $extension, $count);
+				$name = $type === 'template' ? 'templateDetails' : $name;
 				$file = $extensionPath . $name . '.xml';
 
 				// If there is no manifest file, ignore. If it was a component check if the xml was named with the com_ prefix.