diff --git a/homeassistant/components/deconz/gateway.py b/homeassistant/components/deconz/gateway.py
index ccb43d346d8..ef07a97ad8f 100644
--- a/homeassistant/components/deconz/gateway.py
+++ b/homeassistant/components/deconz/gateway.py
@@ -62,13 +62,12 @@ class DeconzGateway:
         self.ignore_state_updates = False
 
         self.signal_reachable = f"deconz-reachable-{config_entry.entry_id}"
+        self.signal_reload_groups = f"deconz_reload_group_{config_entry.entry_id}"
 
-        self.signal_new_group = f"deconz_new_group_{config_entry.entry_id}"
         self.signal_new_light = f"deconz_new_light_{config_entry.entry_id}"
         self.signal_new_sensor = f"deconz_new_sensor_{config_entry.entry_id}"
 
         self.deconz_resource_type_to_signal_new_device = {
-            ResourceGroup.GROUP.value: self.signal_new_group,
             ResourceGroup.LIGHT.value: self.signal_new_light,
             ResourceGroup.SENSOR.value: self.signal_new_sensor,
         }
@@ -77,6 +76,10 @@ class DeconzGateway:
         self.entities: dict[str, set[str]] = {}
         self.events: list[DeconzAlarmEvent | DeconzEvent] = []
 
+        self._option_allow_deconz_groups = self.config_entry.options.get(
+            CONF_ALLOW_DECONZ_GROUPS, DEFAULT_ALLOW_DECONZ_GROUPS
+        )
+
     @property
     def bridgeid(self) -> str:
         """Return the unique identifier of the gateway."""
@@ -218,11 +221,13 @@ class DeconzGateway:
             ]
 
         if self.option_allow_deconz_groups:
-            self.async_add_device_callback(ResourceGroup.GROUP.value)
-
+            if not self._option_allow_deconz_groups:
+                async_dispatcher_send(self.hass, self.signal_reload_groups)
         else:
             deconz_ids += [group.deconz_id for group in self.api.groups.values()]
 
+        self._option_allow_deconz_groups = self.option_allow_deconz_groups
+
         entity_registry = er.async_get(self.hass)
 
         for entity_id, deconz_id in self.deconz_ids.items():
diff --git a/homeassistant/components/deconz/light.py b/homeassistant/components/deconz/light.py
index 8f881ce4917..ebfa2104783 100644
--- a/homeassistant/components/deconz/light.py
+++ b/homeassistant/components/deconz/light.py
@@ -5,6 +5,7 @@ from typing import Any, Generic, TypedDict, TypeVar
 
 from pydeconz.interfaces.lights import LightResources
 from pydeconz.models import ResourceType
+from pydeconz.models.event import EventType
 from pydeconz.models.group import Group
 from pydeconz.models.light import (
     ALERT_LONG,
@@ -110,39 +111,42 @@ async def async_setup_entry(
         )
     )
 
+    async_add_light()
+
     @callback
-    def async_add_group(groups: list[Group] | None = None) -> None:
+    def async_add_group(_: EventType, group_id: str) -> None:
         """Add group from deCONZ."""
-        if not gateway.option_allow_deconz_groups:
+        if (
+            not gateway.option_allow_deconz_groups
+            or (group := gateway.api.groups[group_id])
+            and not group.lights
+        ):
             return
 
-        entities = []
+        async_add_entities([DeconzGroup(group, gateway)])
 
-        if groups is None:
-            groups = list(gateway.api.groups.values())
+    config_entry.async_on_unload(
+        gateway.api.groups.subscribe(
+            async_add_group,
+            EventType.ADDED,
+        )
+    )
 
-        for group in groups:
-            if not group.lights:
-                continue
-
-            known_groups = set(gateway.entities[DOMAIN])
-            new_group = DeconzGroup(group, gateway)
-            if new_group.unique_id not in known_groups:
-                entities.append(new_group)
-
-        if entities:
-            async_add_entities(entities)
+    @callback
+    def async_load_groups() -> None:
+        """Load deCONZ groups."""
+        for group_id in gateway.api.groups:
+            async_add_group(EventType.ADDED, group_id)
 
     config_entry.async_on_unload(
         async_dispatcher_connect(
             hass,
-            gateway.signal_new_group,
-            async_add_group,
+            gateway.signal_reload_groups,
+            async_load_groups,
         )
     )
 
-    async_add_light()
-    async_add_group()
+    async_load_groups()
 
 
 class DeconzBaseLight(Generic[_L], DeconzDevice, LightEntity):