diff --git a/cara/apps/calculator/model_generator.py b/cara/apps/calculator/model_generator.py
index cb6738f7..43779f26 100644
--- a/cara/apps/calculator/model_generator.py
+++ b/cara/apps/calculator/model_generator.py
@@ -202,6 +202,23 @@ class FormData:
                 raise ValueError(
                     f"{start_name} must be less than {end_name}. Got {start} and {end}.")
 
+        # Validate lunch time within the activity times.
+        def validate_lunch(start, finish, time):
+            return start < time < finish 
+        if (self.exposed_lunch_option and (
+                not validate_lunch(self.exposed_start, self.exposed_finish, self.exposed_lunch_start) or
+                not validate_lunch(self.exposed_start, self.exposed_finish, self.exposed_lunch_finish))):
+            raise ValueError(
+                "Exposed lunch break must be within presence times."
+            )
+
+        if (self.infected_dont_have_breaks_with_exposed and self.infected_lunch_option and (
+                not validate_lunch(self.infected_start, self.infected_finish, self.infected_lunch_start) or
+                not validate_lunch(self.infected_start, self.infected_finish, self.infected_lunch_finish))):
+            raise ValueError(
+                "Infected lunch break must be within presence times."
+            )
+
         validation_tuples = [('activity_type', ACTIVITY_TYPES),    
                              ('exposed_coffee_break_option', COFFEE_OPTIONS_INT), 
                              ('infected_coffee_break_option', COFFEE_OPTIONS_INT),   
diff --git a/cara/tests/apps/calculator/test_model_generator.py b/cara/tests/apps/calculator/test_model_generator.py
index cd7de105..fa4ab587 100644
--- a/cara/tests/apps/calculator/test_model_generator.py
+++ b/cara/tests/apps/calculator/test_model_generator.py
@@ -255,6 +255,58 @@ def test_exposed_present_lunch_end_before_beginning(baseline_form: model_generat
         baseline_form.validate()
 
 
+def test_exposed_presence_lunch_start_before_begining(baseline_form: model_generator.FormData):
+    baseline_form.exposed_lunch_start = minutes_since_midnight(8 * 60)
+    with pytest.raises(ValueError, match='Exposed lunch break must be within presence times.'):
+        baseline_form.validate()
+
+
+def test_exposed_presence_lunch_start_after_finishing(baseline_form: model_generator.FormData):
+    baseline_form.exposed_lunch_start = minutes_since_midnight(19 * 60)
+    baseline_form.exposed_lunch_finish = minutes_since_midnight(20 * 60)
+    with pytest.raises(ValueError, match='Exposed lunch break must be within presence times.'):
+        baseline_form.validate()
+
+
+def test_exposed_presence_lunch_finish_before_begining(baseline_form: model_generator.FormData):
+    baseline_form.exposed_lunch_start = minutes_since_midnight(7 * 60)
+    baseline_form.exposed_lunch_finish = minutes_since_midnight(8 * 60)
+    with pytest.raises(ValueError, match='Exposed lunch break must be within presence times.'):
+        baseline_form.validate()
+
+
+def test_exposed_presence_lunch_finish_after_finishing(baseline_form: model_generator.FormData):
+    baseline_form.exposed_lunch_finish = minutes_since_midnight(19 * 60)
+    with pytest.raises(ValueError, match='Exposed lunch break must be within presence times.'):
+        baseline_form.validate()
+
+
+def test_infected_presence_lunch_start_before_begining(baseline_form: model_generator.FormData):
+    baseline_form.infected_lunch_start = minutes_since_midnight(8 * 60)
+    with pytest.raises(ValueError, match='Infected lunch break must be within presence times.'):
+        baseline_form.validate()
+
+
+def test_infected_presence_lunch_start_after_finishing(baseline_form: model_generator.FormData):
+    baseline_form.infected_lunch_start = minutes_since_midnight(19 * 60)
+    baseline_form.infected_lunch_finish = minutes_since_midnight(20 * 60)
+    with pytest.raises(ValueError, match='Infected lunch break must be within presence times.'):
+        baseline_form.validate()
+
+
+def test_infected_presence_lunch_finish_before_begining(baseline_form: model_generator.FormData):
+    baseline_form.infected_lunch_start = minutes_since_midnight(7 * 60)
+    baseline_form.infected_lunch_finish = minutes_since_midnight(8 * 60)
+    with pytest.raises(ValueError, match='Infected lunch break must be within presence times.'):
+        baseline_form.validate()
+
+
+def test_infected_presence_lunch_finish_after_finishing(baseline_form: model_generator.FormData):
+    baseline_form.infected_lunch_finish = minutes_since_midnight(19 * 60)
+    with pytest.raises(ValueError, match='Infected lunch break must be within presence times.'):
+        baseline_form.validate()
+
+
 @pytest.fixture
 def coffee_break_between_1045_and_1115(baseline_form: model_generator.FormData):
     baseline_form.exposed_coffee_break_option = 'coffee_break_1'