diff --git a/homeassistant/components/sensor/yr.py b/homeassistant/components/sensor/yr.py
index 3a434e30a85..593cb1cf061 100644
--- a/homeassistant/components/sensor/yr.py
+++ b/homeassistant/components/sensor/yr.py
@@ -9,7 +9,10 @@ import requests
 import voluptuous as vol
 
 import homeassistant.helpers.config_validation as cv
-from homeassistant.const import CONF_LATITUDE, CONF_LONGITUDE
+from homeassistant.const import (
+    CONF_PLATFORM, CONF_LATITUDE, CONF_LONGITUDE, CONF_ELEVATION,
+    CONF_MONITORED_CONDITIONS
+)
 from homeassistant.helpers.entity import Entity
 from homeassistant.util import dt as dt_util
 from homeassistant.util import location
@@ -19,8 +22,6 @@ _LOGGER = logging.getLogger(__name__)
 
 REQUIREMENTS = ['xmltodict']
 
-CONF_MONITORED_CONDITIONS = 'monitored_conditions'
-
 # Sensor types are defined like so:
 SENSOR_TYPES = {
     'symbol': ['Symbol', None],
@@ -40,10 +41,12 @@ SENSOR_TYPES = {
 }
 
 PLATFORM_SCHEMA = vol.Schema({
-    vol.Required('platform'): 'yr',
+    vol.Required(CONF_PLATFORM): 'yr',
     vol.Optional(CONF_MONITORED_CONDITIONS, default=[]):
         [vol.In(SENSOR_TYPES.keys())],
-    vol.Optional('elevation'): cv.positive_int,
+    vol.Optional(CONF_LATITUDE): cv.latitude,
+    vol.Optional(CONF_LONGITUDE): cv.longitude,
+    vol.Optional(CONF_ELEVATION): cv.positive_int,
 })
 
 
@@ -51,7 +54,7 @@ def setup_platform(hass, config, add_devices, discovery_info=None):
     """Setup the Yr.no sensor."""
     latitude = config.get(CONF_LATITUDE, hass.config.latitude)
     longitude = config.get(CONF_LONGITUDE, hass.config.longitude)
-    elevation = config.get('elevation')
+    elevation = config.get(CONF_ELEVATION)
 
     if None in (latitude, longitude):
         _LOGGER.error("Latitude or longitude not set in Home Assistant config")
diff --git a/homeassistant/components/sun.py b/homeassistant/components/sun.py
index f4e13b11761..b33159f49e1 100644
--- a/homeassistant/components/sun.py
+++ b/homeassistant/components/sun.py
@@ -13,13 +13,12 @@ from homeassistant.helpers.event import (
     track_point_in_utc_time, track_utc_time_change)
 from homeassistant.util import dt as dt_util
 from homeassistant.util import location as location_util
+from homeassistant.const import CONF_ELEVATION
 
 REQUIREMENTS = ['astral==1.0']
 DOMAIN = "sun"
 ENTITY_ID = "sun.sun"
 
-CONF_ELEVATION = 'elevation'
-
 STATE_ABOVE_HORIZON = "above_horizon"
 STATE_BELOW_HORIZON = "below_horizon"
 
diff --git a/homeassistant/const.py b/homeassistant/const.py
index 700c4d964a3..68a61c18cb8 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -16,6 +16,7 @@ DEVICE_DEFAULT_NAME = "Unnamed Device"
 CONF_ICON = "icon"
 CONF_LATITUDE = "latitude"
 CONF_LONGITUDE = "longitude"
+CONF_ELEVATION = "elevation"
 CONF_TEMPERATURE_UNIT = "temperature_unit"
 CONF_NAME = "name"
 CONF_TIME_ZONE = "time_zone"
@@ -30,6 +31,7 @@ CONF_PASSWORD = "password"
 CONF_API_KEY = "api_key"
 CONF_ACCESS_TOKEN = "access_token"
 CONF_FILENAME = "filename"
+CONF_MONITORED_CONDITIONS = 'monitored_conditions'
 CONF_OPTIMISTIC = 'optimistic'
 CONF_SCAN_INTERVAL = "scan_interval"
 CONF_VALUE_TEMPLATE = "value_template"