diff --git a/includes/class-hvac-plugin.php b/includes/class-hvac-plugin.php
index 7de097c1..20767668 100644
--- a/includes/class-hvac-plugin.php
+++ b/includes/class-hvac-plugin.php
@@ -196,6 +196,9 @@ final class HVAC_Plugin {
         // Unified Event Management System (replaces 8+ fragmented implementations)
         require_once HVAC_PLUGIN_DIR . 'includes/class-hvac-event-manager.php';
 
+        // Base Form Builder (required for Phase 2A)
+        require_once HVAC_PLUGIN_DIR . 'includes/class-hvac-form-builder.php';
+
         // Phase 2A: Event Templates & Bulk Operations System
         require_once HVAC_PLUGIN_DIR . 'includes/class-hvac-event-template-manager.php';
         require_once HVAC_PLUGIN_DIR . 'includes/class-hvac-event-form-builder.php';