diff --git a/src/includes/constants.php b/src/includes/constants.php
index 2002a2321..89d386494 100644
--- a/src/includes/constants.php
+++ b/src/includes/constants.php
@@ -22,6 +22,8 @@ use SilverStripe\Core\TempFolder;
  * - THEMES_PATH: Absolute filepath, e.g. "/var/www/my-webroot/themes"
  * - FRAMEWORK_DIR: Path relative to webroot, e.g. "framework"
  * - FRAMEWORK_PATH:Absolute filepath, e.g. "/var/www/my-webroot/framework"
+ * - PUBLIC_DIR: Webroot path relative to project root, e.g. "public" or ""
+ * - PUBLIC_PATH: Absolute path to webroot, e.g. "/var/www/project/public"
  * - THIRDPARTY_DIR: Path relative to webroot, e.g. "framework/thirdparty"
  * - THIRDPARTY_PATH: Absolute filepath, e.g. "/var/www/my-webroot/framework/thirdparty"
  */
@@ -56,6 +58,14 @@ if (!defined('BASE_PATH')) {
     }));
 }
 
+// Set public webroot dir / path
+if (!defined('PUBLIC_DIR')) {
+    define('PUBLIC_DIR', '');
+}
+if (!defined('PUBLIC_PATH')) {
+    define('PUBLIC_PATH', BASE_PATH);
+}
+
 // Allow a first class env var to be set that disables .env file loading
 if (!Environment::getEnv('SS_IGNORE_DOT_ENV')) {
     call_user_func(function () {