diff --git a/modules/environments/home-assistant/default.nix b/modules/environments/home-assistant/default.nix
index 057b139..54a217c 100644
--- a/modules/environments/home-assistant/default.nix
+++ b/modules/environments/home-assistant/default.nix
@@ -23,6 +23,23 @@ in
     services.home-assistant = {
       enable = true;
       openFirewall = true;
+
+      # HACS-style custom components, packaged declaratively (no HACS runtime).
+      # Config-flow based: add via Settings > Devices & Services after rebuild.
+      customComponents = [
+        (pkgs.buildHomeAssistantComponent {
+          owner = "Matts-Baps";
+          domain = "sourdough";
+          version = "1.1.3";
+          src = pkgs.fetchFromGitHub {
+            owner = "Matts-Baps";
+            repo = "ha-sourdough";
+            rev = "v1.1.3";
+            hash = "sha256-Uoid/2f6GxZMuE5Keu2VjHPYuOxnYG8hsCD6BYcaTvM=";
+          };
+        })
+      ];
+
       extraComponents = [
         "matter"
         "mobile_app"