diff --git a/homeassistant/helpers/intent.py b/homeassistant/helpers/intent.py
index c46a506a2eb..01763fade9d 100644
--- a/homeassistant/helpers/intent.py
+++ b/homeassistant/helpers/intent.py
@@ -718,9 +718,13 @@ class IntentHandler:
     """Intent handler registration."""
 
     intent_type: str
-    slot_schema: vol.Schema | None = None
     platforms: Iterable[str] | None = []
 
+    @property
+    def slot_schema(self) -> dict | None:
+        """Return a slot schema."""
+        return None
+
     @callback
     def async_can_handle(self, intent_obj: Intent) -> bool:
         """Test if an intent can be handled."""
@@ -761,14 +765,6 @@ class DynamicServiceIntentHandler(IntentHandler):
     Service specific intent handler that calls a service by name/entity_id.
     """
 
-    slot_schema = {
-        vol.Any("name", "area", "floor"): cv.string,
-        vol.Optional("domain"): vol.All(cv.ensure_list, [cv.string]),
-        vol.Optional("device_class"): vol.All(cv.ensure_list, [cv.string]),
-        vol.Optional("preferred_area_id"): cv.string,
-        vol.Optional("preferred_floor_id"): cv.string,
-    }
-
     # We use a small timeout in service calls to (hopefully) pass validation
     # checks, but not try to wait for the call to fully complete.
     service_timeout: float = 0.2
@@ -809,33 +805,33 @@ class DynamicServiceIntentHandler(IntentHandler):
                 self.optional_slots[key] = value_schema
 
     @cached_property
-    def _slot_schema(self) -> vol.Schema:
-        """Create validation schema for slots (with extra required slots)."""
-        if self.slot_schema is None:
-            raise ValueError("Slot schema is not defined")
+    def slot_schema(self) -> dict:
+        """Return a slot schema."""
+        slot_schema = {
+            vol.Any("name", "area", "floor"): cv.string,
+            vol.Optional("domain"): vol.All(cv.ensure_list, [cv.string]),
+            vol.Optional("device_class"): vol.All(cv.ensure_list, [cv.string]),
+            vol.Optional("preferred_area_id"): cv.string,
+            vol.Optional("preferred_floor_id"): cv.string,
+        }
 
-        if self.required_slots or self.optional_slots:
-            slot_schema = {
-                **self.slot_schema,
-                **{
-                    vol.Required(key[0]): schema
-                    for key, schema in self.required_slots.items()
-                },
-                **{
-                    vol.Optional(key[0]): schema
-                    for key, schema in self.optional_slots.items()
-                },
-            }
-        else:
-            slot_schema = self.slot_schema
+        if self.required_slots:
+            slot_schema.update(
+                {
+                    vol.Required(key[0]): validator
+                    for key, validator in self.required_slots.items()
+                }
+            )
 
-        return vol.Schema(
-            {
-                key: SLOT_SCHEMA.extend({"value": validator})
-                for key, validator in slot_schema.items()
-            },
-            extra=vol.ALLOW_EXTRA,
-        )
+        if self.optional_slots:
+            slot_schema.update(
+                {
+                    vol.Optional(key[0]): validator
+                    for key, validator in self.optional_slots.items()
+                }
+            )
+
+        return slot_schema
 
     @abstractmethod
     def get_domain_and_service(
diff --git a/tests/helpers/test_intent.py b/tests/helpers/test_intent.py
index 5e54277b423..1ac189d8242 100644
--- a/tests/helpers/test_intent.py
+++ b/tests/helpers/test_intent.py
@@ -32,7 +32,12 @@ class MockIntentHandler(intent.IntentHandler):
 
     def __init__(self, slot_schema) -> None:
         """Initialize the mock handler."""
-        self.slot_schema = slot_schema
+        self._mock_slot_schema = slot_schema
+
+    @property
+    def slot_schema(self):
+        """Return the slot schema."""
+        return self._mock_slot_schema
 
 
 async def test_async_match_states(