diff --git a/api/core/house/house.checkUsersPresence.js b/api/core/house/house.checkUsersPresence.js
new file mode 100644
index 0000000000..2751dddea7
--- /dev/null
+++ b/api/core/house/house.checkUsersPresence.js
@@ -0,0 +1,34 @@
+const queries = require('./house.queries.js');
+const Promise = require('bluebird');
+
+module.exports = function checkUsersPresence(){
+    sails.log.debug(`House : checkUsersPresence`);
+
+    // first, get the time a user is considered not at home anymore
+    return gladys.param.getValue('USER_TIME_BEFORE_CONSIDERING_LEFT_HOME')
+        .then((timeBeforeLeftInMinute) => {
+
+            // get all houses
+            return [timeBeforeLeftInMinute, gladys.house.getAll()];
+        })
+        .spread((timeBeforeLeftInMinute, houses) => {
+
+            return [houses, 
+                Promise.map(houses, function(house) {  
+                    return gladys.utils.sql(queries.getUserAtHomeAndNotSeenSince, [house.id, house.id, timeBeforeLeftInMinute]);
+                })
+            ];
+        })
+        .spread((houses, usersArray) => {
+
+            // foreach house
+            return Promise.map(houses, function(house, index) {
+
+                // foreach user in this house and not put as 
+                return Promise.map(usersArray[index], function(user) {
+                    sails.log.debug(`House : checkUserPresence : Putting user ${user.id} as left house : ${house.id}`);
+                    return gladys.event.create({code: 'left-home', user: user.id, house: house.id});
+                });
+            });
+        });
+};
\ No newline at end of file
diff --git a/api/core/house/house.queries.js b/api/core/house/house.queries.js
index b2f40e4c71..d0e24980ad 100644
--- a/api/core/house/house.queries.js
+++ b/api/core/house/house.queries.js
@@ -33,5 +33,28 @@ module.exports = {
       FROM user 
       WHERE user.id = ?
       HAVING lastHouseEvent = 'back-at-home'
+  `,
+  getUserAtHomeAndNotSeenSince: 
+  `
+    SELECT user.id, MAX(event.datetime) as datetime  
+    FROM user
+    JOIN event ON event.user = user.id
+    JOIN eventtype ON event.eventtype = eventtype.id
+    WHERE ( eventtype.code = 'back-at-home' OR eventtype.code = 'user-seen-at-home' )
+    AND house = ?
+    AND user.id IN (
+        SELECT user.id
+        FROM user 
+        WHERE ( 
+            SELECT eventtype.code
+            FROM event 
+            JOIN eventtype ON event.eventtype = eventtype.id
+            WHERE 
+            ( eventtype.code = 'back-at-home' OR eventtype.code = 'left-home' )
+            AND user = user.id
+            AND house = ?
+            ORDER BY datetime DESC LIMIT 1 ) = 'back-at-home'
+    )
+    HAVING datetime < DATE_SUB(NOW(), INTERVAL ? MINUTE)
   `
 };
\ No newline at end of file
diff --git a/api/core/house/index.js b/api/core/house/index.js
index 8ed11b448c..d0bb9e3173 100644
--- a/api/core/house/index.js
+++ b/api/core/house/index.js
@@ -1,4 +1,5 @@
 
+module.exports.checkUsersPresence = require('./house.checkUsersPresence.js');
 module.exports.create = require('./house.create.js');
 module.exports.delete = require('./house.delete.js');
 module.exports.get = require('./house.get.js');
diff --git a/test/fixtures/eventtype.json b/test/fixtures/eventtype.json
index d9ab6d9de0..239b9e6cdb 100644
--- a/test/fixtures/eventtype.json
+++ b/test/fixtures/eventtype.json
@@ -62,5 +62,13 @@
 		"service": "house",
 		"faIcon": "fa fa-desktop",
 		"iconColor": "bg-black"
+	},
+	{
+		"id": 9,
+		"code": "left-home",
+		"name": "User has left home !",
+		"service": "house",
+		"faIcon": "fa fa-desktop",
+		"iconColor": "bg-black"
 	}
 ]
\ No newline at end of file
diff --git a/test/fixtures/param.json b/test/fixtures/param.json
index eeb1882da1..dd48c5f9ab 100644
--- a/test/fixtures/param.json
+++ b/test/fixtures/param.json
@@ -2,5 +2,9 @@
     {
         "name": "quote_of_the_day",
         "value": "Design is not just what it looks like and feels like. Design is how it works."
+    },
+    {
+        "name": "USER_TIME_BEFORE_CONSIDERING_LEFT_HOME",
+        "value": "20"
     }
 ]
\ No newline at end of file
diff --git a/test/unit/api/core/house/house.checkUsersPresence.test.js b/test/unit/api/core/house/house.checkUsersPresence.test.js
new file mode 100644
index 0000000000..4a468447eb
--- /dev/null
+++ b/test/unit/api/core/house/house.checkUsersPresence.test.js
@@ -0,0 +1,18 @@
+var should = require('should');
+var validateHouse = require('../../validator/houseValidator.js');
+
+describe('House', function() {
+
+  describe('checkUserPresence', function() {
+    
+    it('should check if user is present and not seen since a given time', function (done) {
+          
+        gladys.house.checkUsersPresence()
+            .then(function(result){
+                
+                done();
+            }).catch(done);
+    });
+    
+  });
+});
\ No newline at end of file