diff --git a/nixos/modules/services/misc/home-assistant.nix b/nixos/modules/services/misc/home-assistant.nix
index 8279d075bafb..2de25d87ed39 100644
--- a/nixos/modules/services/misc/home-assistant.nix
+++ b/nixos/modules/services/misc/home-assistant.nix
@@ -24,6 +24,8 @@ let
 
   availableComponents = cfg.package.availableComponents;
 
+  explicitComponents = cfg.package.extraComponents;
+
   usedPlatforms = config:
     if isAttrs config then
       optional (config ? platform) config.platform
@@ -42,10 +44,13 @@ let
   # } ];
   useComponentPlatform = component: elem component (usedPlatforms cfg.config);
 
-  # Returns whether component is used in config
+  useExplicitComponent = component: elem component explicitComponents;
+
+  # Returns whether component is used in config or explicitly passed into package
   useComponent = component:
     hasAttrByPath (splitString "." component) cfg.config
-    || useComponentPlatform component;
+    || useComponentPlatform component
+    || useExplicitComponent component;
 
   # List of components used in config
   extraComponents = filter useComponent availableComponents;
diff --git a/nixos/tests/home-assistant.nix b/nixos/tests/home-assistant.nix
index 0894736bac9c..1ab5755863f7 100644
--- a/nixos/tests/home-assistant.nix
+++ b/nixos/tests/home-assistant.nix
@@ -24,6 +24,11 @@ in {
     services.home-assistant = {
       inherit configDir;
       enable = true;
+      package = (pkgs.home-assistant.override {
+        extraComponents = [ "zha" ];
+      }).overrideAttrs (oldAttrs: {
+        doInstallCheck = false;
+      });
       config = {
         homeassistant = {
           name = "Home";
@@ -87,6 +92,8 @@ in {
     with subtest("Check that capabilities are passed for emulated_hue to bind to port 80"):
         hass.wait_for_open_port(80)
         hass.succeed("curl --fail http://localhost:80/description.xml")
+    with subtest("Check extra components are considered in systemd unit hardening"):
+        hass.succeed("systemctl show -p DeviceAllow home-assistant.service | grep -q char-ttyUSB")
     with subtest("Print log to ease debugging"):
         output_log = hass.succeed("cat ${configDir}/home-assistant.log")
         print("\n### home-assistant.log ###\n")
diff --git a/pkgs/servers/home-assistant/default.nix b/pkgs/servers/home-assistant/default.nix
index 4b4cb222e964..5febf010dff8 100644
--- a/pkgs/servers/home-assistant/default.nix
+++ b/pkgs/servers/home-assistant/default.nix
@@ -888,7 +888,7 @@ in with py.pkgs; buildPythonApplication rec {
   '';
 
   passthru = {
-    inherit availableComponents;
+    inherit availableComponents extraComponents;
     python = py;
     tests = {
       inherit (nixosTests) home-assistant;