diff --git a/homeassistant/components/bosch_shc/sensor.py b/homeassistant/components/bosch_shc/sensor.py
index a5974a0b1527..c83863a1acd9 100644
--- a/homeassistant/components/bosch_shc/sensor.py
+++ b/homeassistant/components/bosch_shc/sensor.py
@@ -7,6 +7,7 @@ from typing import TYPE_CHECKING, Any, override
 from boschshcpy import (
     SHCLightSwitchBSM,
     SHCMicromoduleShutterControl,
+    SHCSession,
     SHCSmartPlug,
     SHCSmartPlugCompact,
     SHCThermostat,
@@ -28,10 +29,12 @@ from homeassistant.const import (
     UnitOfTemperature,
 )
 from homeassistant.core import HomeAssistant
+from homeassistant.helpers.device_registry import DeviceInfo
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 from homeassistant.helpers.typing import StateType
 
 from . import BoschConfigEntry
+from .const import DOMAIN
 from .entity import SHCEntity
 
 PARALLEL_UPDATES = 0
@@ -297,6 +300,57 @@ async def async_setup_entry(
 
     async_add_entities(entities)
 
+    async_add_entities(
+        [SHCOpenWindowsSensor(session=session, parent_id=shc_info.unique_id)],
+        update_before_add=True,
+    )
+
+
+class SHCOpenWindowsSensor(SensorEntity):
+    """Whole-home summary of open doors/windows (official OpenAPI spec).
+
+    Not tied to one SHC device, so this does not inherit SHCEntity — it's
+    scoped to the config entry and linked to the hub device directly. The
+    underlying doors-windows/openwindows endpoint is a plain GET, not
+    delivered by the long-poll stream, so this needs should_poll=True.
+    """
+
+    _attr_has_entity_name = True
+    _attr_translation_key = "open_windows_doors"
+    _attr_should_poll = True
+
+    def __init__(self, session: SHCSession, parent_id: str) -> None:
+        """Initialize the open-windows/doors summary sensor."""
+        self._session = session
+        self._attr_unique_id = f"{parent_id}_open_windows_doors"
+        self._attr_device_info = DeviceInfo(identifiers={(DOMAIN, parent_id)})
+        self._open_doors: list[dict[str, Any]] = []
+        self._open_windows: list[dict[str, Any]] = []
+        self._open_others: list[dict[str, Any]] = []
+
+    @property
+    @override
+    def native_value(self) -> int:
+        """Return the total count of open doors, windows, and other openings."""
+        return len(self._open_doors) + len(self._open_windows) + len(self._open_others)
+
+    @property
+    @override
+    def extra_state_attributes(self) -> dict[str, list[str]]:
+        """Return the names of each currently-open door/window/other opening."""
+        return {
+            "open_doors": [d.get("name", "") for d in self._open_doors],
+            "open_windows": [w.get("name", "") for w in self._open_windows],
+            "open_others": [o.get("name", "") for o in self._open_others],
+        }
+
+    def update(self) -> None:
+        """Poll the whole-home open-doors/open-windows summary."""
+        data = self._session.api.get_open_windows()
+        self._open_doors = data.get("openDoors", [])
+        self._open_windows = data.get("openWindows", [])
+        self._open_others = data.get("openOthers", [])
+
 
 class SHCSensor[_DeviceT: SHCDevice](SHCEntity, SensorEntity):
     """Representation of a SHC sensor."""
diff --git a/homeassistant/components/bosch_shc/strings.json b/homeassistant/components/bosch_shc/strings.json
index d2359625d613..1788a5194b74 100644
--- a/homeassistant/components/bosch_shc/strings.json
+++ b/homeassistant/components/bosch_shc/strings.json
@@ -53,6 +53,9 @@
       "humidity_rating": {
         "name": "Humidity rating"
       },
+      "open_windows_doors": {
+        "name": "Open doors and windows"
+      },
       "purity": {
         "name": "Purity"
       },
diff --git a/tests/components/bosch_shc/test_sensor.py b/tests/components/bosch_shc/test_sensor.py
new file mode 100644
index 000000000000..7827f27db15e
--- /dev/null
+++ b/tests/components/bosch_shc/test_sensor.py
@@ -0,0 +1,67 @@
+"""Tests for the Bosch SHC sensor platform."""
+
+from collections.abc import Generator
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from homeassistant.const import Platform
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import device_registry as dr, entity_registry as er
+from homeassistant.helpers.entity_component import async_update_entity
+
+from .conftest import setup_integration
+
+from tests.common import MockConfigEntry
+
+
+@pytest.fixture(autouse=True)
+def platforms() -> Generator[None]:
+    """Restrict bosch_shc setup to the sensor platform."""
+    with patch("homeassistant.components.bosch_shc.PLATFORMS", [Platform.SENSOR]):
+        yield
+
+
+@pytest.mark.usefixtures("mock_session")
+async def test_open_windows_doors_sensor(
+    hass: HomeAssistant,
+    mock_session: MagicMock,
+    mock_config_entry: MockConfigEntry,
+    entity_registry: er.EntityRegistry,
+    device_registry: dr.DeviceRegistry,
+) -> None:
+    """The whole-home open-doors/open-windows summary is exposed and polled."""
+    mock_session.api.get_open_windows.return_value = {
+        "openDoors": [{"name": "Front Door"}],
+        "openWindows": [{"name": "Kitchen Window"}, {"name": "Bedroom Window"}],
+        "openOthers": [{"name": "Cat Flap"}],
+    }
+    await setup_integration(hass, mock_config_entry)
+
+    entity_id = "sensor.mock_title_open_doors_and_windows"
+    state = hass.states.get(entity_id)
+    assert state is not None
+    assert state.state == "4"
+    assert state.attributes["open_doors"] == ["Front Door"]
+    assert state.attributes["open_windows"] == ["Kitchen Window", "Bedroom Window"]
+    assert state.attributes["open_others"] == ["Cat Flap"]
+
+    hub_device = device_registry.async_get_device_by_identifier(
+        ("bosch_shc", "test-mac"), mock_config_entry.entry_id
+    )
+    assert hub_device is not None
+    entry = entity_registry.async_get(entity_id)
+    assert entry is not None
+    assert entry.device_id == hub_device.id
+
+    mock_session.api.get_open_windows.return_value = {
+        "openDoors": [],
+        "openWindows": [],
+        "openOthers": [],
+    }
+    await async_update_entity(hass, entity_id)
+    await hass.async_block_till_done()
+
+    state = hass.states.get(entity_id)
+    assert state is not None
+    assert state.state == "0"