diff --git a/samsung_appliance/registry/capabilities/__init__.py b/samsung_appliance/registry/capabilities/__init__.py
new file mode 100644
index 0000000..27f21af
--- /dev/null
+++ b/samsung_appliance/registry/capabilities/__init__.py
@@ -0,0 +1,11 @@
+from ..capability import Capability
+from . import common
+
+
+def _is_capability(v):
+    return isinstance(v, Capability)
+
+
+ALL = [
+    *[v for v in vars(common).values() if _is_capability(v)],
+]
diff --git a/samsung_appliance/registry/capabilities/common.py b/samsung_appliance/registry/capabilities/common.py
new file mode 100644
index 0000000..6341e5e
--- /dev/null
+++ b/samsung_appliance/registry/capabilities/common.py
@@ -0,0 +1,119 @@
+"""Capabilities shared across multiple appliance families.
+
+rt strings verified against live device dumps:
+  /kidslock/vs/0        -> x.com.samsung.da.operation
+  /remotectrl/vs/0      -> x.com.samsung.da.configuration
+  /power/vs/0           -> x.com.samsung.da.operation  (shares rt with kidslock)
+  /alarms/vs/0          -> x.com.samsung.da.alarms
+  /energy/consumption/vs/0  -> x.com.samsung.da.energyconsumption
+  /water/consumption/vs/0   -> x.com.samsung.da.waterconsumption
+  /filter/waterfilter/vs/0  -> x.com.samsung.da.filter.water
+
+NOTE: KIDS_LOCK and POWER share the same rt (x.com.samsung.da.operation).
+When building a registry dict keyed by rt, only one can be present.
+They target different hrefs (/kidslock/vs/0 vs /power/vs/0) with different
+field keys — at runtime the absent field returns None and is filtered.
+"""
+from ..capability import Capability
+from ..entities import BinarySensorDesc, SensorDesc
+
+
+def _num(v):
+    try:
+        return float(v)
+    except (TypeError, ValueError):
+        return None
+
+
+def _clamp_power(v):
+    n = _num(v)
+    return 0.0 if (n is not None and n < 0) else n
+
+
+def _wh_to_kwh(v):
+    n = _num(v)
+    return round(n / 1000.0, 2) if n is not None else None
+
+
+def _ml_to_l(v):
+    n = _num(v)
+    return round(n / 1000.0, 1) if n is not None else None
+
+
+def _last_alarm_code(items):
+    if items and isinstance(items, list):
+        return items[-1].get('x.com.samsung.da.code')
+    return None
+
+
+KIDS_LOCK = Capability(
+    rt='x.com.samsung.da.operation',
+    entities=(
+        BinarySensorDesc(key='child_lock', field='x.com.samsung.da.kidsLock',
+                         name='Child lock', device_class='lock',
+                         value_fn=lambda v: v != 'Ready'),
+    ),
+)
+
+REMOTE_CONTROL = Capability(
+    rt='x.com.samsung.da.configuration',
+    entities=(
+        BinarySensorDesc(key='remote_control',
+                         field='x.com.samsung.da.remoteControlEnabled',
+                         name='Remote control', device_class='connectivity',
+                         value_fn=lambda v: str(v).lower() == 'true'),
+    ),
+)
+
+# POWER shares rt with KIDS_LOCK (x.com.samsung.da.operation).
+# Do not include both in the same registry dict simultaneously.
+POWER = Capability(
+    rt='x.com.samsung.da.operation',
+    entities=(
+        BinarySensorDesc(key='power_state', field='x.com.samsung.da.power',
+                         name='Power', device_class='power',
+                         value_fn=lambda v: v == 'On'),
+    ),
+)
+
+ALARMS = Capability(
+    rt='x.com.samsung.da.alarms',
+    entities=(
+        SensorDesc(key='alarm_code', field='x.com.samsung.da.items',
+                   name='Alarm code', icon='mdi:alert',
+                   entity_category='diagnostic', value_fn=_last_alarm_code),
+    ),
+)
+
+ENERGY_METER = Capability(
+    rt='x.com.samsung.da.energyconsumption',
+    entities=(
+        SensorDesc(key='power_watts', field='x.com.samsung.da.instantaneousPower',
+                   name='Power', device_class='power', state_class='measurement',
+                   unit='W', value_fn=_clamp_power),
+        SensorDesc(key='energy_kwh', field='x.com.samsung.da.cumulativePower',
+                   name='Energy', device_class='energy',
+                   state_class='total_increasing', unit='kWh', value_fn=_wh_to_kwh),
+    ),
+)
+
+WATER_METER = Capability(
+    rt='x.com.samsung.da.waterconsumption',
+    entities=(
+        SensorDesc(key='water_liters', field='x.com.samsung.da.cumulativeWater',
+                   name='Water consumption', device_class='water',
+                   state_class='total_increasing', unit='L', icon='mdi:water',
+                   value_fn=_ml_to_l),
+    ),
+)
+
+WATER_FILTER = Capability(
+    rt='x.com.samsung.da.filter.water',
+    entities=(
+        SensorDesc(key='filter_usage', field='x.com.samsung.da.filterUsage',
+                   name='Filter usage', unit='%', state_class='measurement',
+                   icon='mdi:filter'),
+        SensorDesc(key='filter_status', field='x.com.samsung.da.filterStatus',
+                   name='Filter status', icon='mdi:filter-check'),
+    ),
+)
diff --git a/tests/test_common_capabilities.py b/tests/test_common_capabilities.py
new file mode 100644
index 0000000..92276fc
--- /dev/null
+++ b/tests/test_common_capabilities.py
@@ -0,0 +1,30 @@
+from samsung_appliance.registry.capabilities import common
+from samsung_appliance.registry.discovery import discover
+
+
+def _reg():
+    return {c.rt: c for c in (
+        common.KIDS_LOCK, common.REMOTE_CONTROL, common.ALARMS,
+        common.ENERGY_METER, common.WATER_METER, common.WATER_FILTER,
+    )}
+
+
+def test_kids_lock_binary_value_fn():
+    desc = common.KIDS_LOCK.entities[0]
+    assert desc.value_fn('Lock') is True
+    assert desc.value_fn('Ready') is False
+
+
+def test_energy_clamps_negative_power(fridge_resources):
+    # instantaneousPower can read negative at idle; must clamp to 0.
+    pw = next(e for e in common.ENERGY_METER.entities if e.key == 'power_watts')
+    assert pw.value_fn(-500.0) == 0.0
+    assert pw.value_fn(93.0) == 93.0
+
+
+def test_common_caps_discover_on_dishwasher(dishwasher_resources):
+    bound = discover(dishwasher_resources, _reg())
+    keys = {b.desc.key for b in bound}
+    assert 'child_lock' in keys
+    assert 'remote_control' in keys
+    assert 'power_watts' in keys