diff --git a/application/ConstructionConsentProject/ConstructionConsentProject.php b/application/ConstructionConsentProject/ConstructionConsentProject.php
index 1d7c2965b..c0844a85a 100644
--- a/application/ConstructionConsentProject/ConstructionConsentProject.php
+++ b/application/ConstructionConsentProject/ConstructionConsentProject.php
@@ -274,6 +274,9 @@ AND (
       (cco.zip IS NULL OR cco.zip NOT REGEXP '^[0-9]{4}$')
     )
     OR
+    /* street lowercase should not be oesterreich, österreich, austria, germany, deutschland, schweiz, switzerland */
+    (LOWER(cco.street) NOT REGEXP '^(österreich|austria|germany|deutschland|schweiz|switzerland)$')
+    OR
     /* For Germany: ZIP must be exactly 5 digits */
     (
       (LOWER(cco.country) = 'deutschland' OR LOWER(cco.country) = 'germany') AND
@@ -361,6 +364,9 @@ AND (
         (cco.zip IS NULL OR cco.zip NOT REGEXP '^[0-9]{4}$')
     )
     OR
+    /* street lowercase should not be oesterreich, österreich, austria, germany, deutschland, schweiz, switzerland */
+    (LOWER(cco.street) NOT REGEXP '^(österreich|austria|germany|deutschland|schweiz|switzerland)$')
+    OR
     /* For Germany: ZIP must be exactly 5 digits */
     (
         (LOWER(cco.country) = 'deutschland' OR LOWER(cco.country) = 'germany') AND
@@ -406,6 +412,12 @@ ORDER BY
                 $errors[] = 'country';
             }
 
+            // Check street for specific lowercase values
+            $streetLower = strtolower(trim($data['street'] ?? ''));
+            if (in_array($streetLower, ['österreich', 'austria', 'germany', 'deutschland', 'schweiz', 'switzerland'])) {
+                $errors[] = 'street';
+            }
+
             // Check ZIP based on country
             $country = strtolower($data['country'] ?? '');
 
diff --git a/public/js/pages/ConstructionConsentFaultyEntries/ConstructionConsentFaultyEntries.js b/public/js/pages/ConstructionConsentFaultyEntries/ConstructionConsentFaultyEntries.js
index 6dff2b780..a4e947f22 100644
--- a/public/js/pages/ConstructionConsentFaultyEntries/ConstructionConsentFaultyEntries.js
+++ b/public/js/pages/ConstructionConsentFaultyEntries/ConstructionConsentFaultyEntries.js
@@ -166,6 +166,7 @@ Vue.component('construction-consent-faulty-entries', {
                 'lastname': 'Fehlender Nachname',
                 'city': 'Fehlende Stadt',
                 'zip': 'Ungültige PLZ',
+                'street': 'Ungültige Straße',
                 'country': 'Ungültiges Land (enthält Zahlen)'
             };
             return errors[error] || error;