diff --git a/apps/scandic-web/components/Forms/Edit/Profile/schema.ts b/apps/scandic-web/components/Forms/Edit/Profile/schema.ts
index cb377e1fd..798ddb43f 100644
--- a/apps/scandic-web/components/Forms/Edit/Profile/schema.ts
+++ b/apps/scandic-web/components/Forms/Edit/Profile/schema.ts
@@ -6,6 +6,7 @@ import { phoneValidator } from "@/utils/zod/phoneValidator"
 export const editProfileErrors = {
   COUNTRY_REQUIRED: "COUNTRY_REQUIRED",
   ZIP_CODE_REQUIRED: "ZIP_CODE_REQUIRED",
+  ZIP_CODE_INVALID: "ZIP_CODE_INVALID",
   PHONE_REQUIRED: "PHONE_REQUIRED",
   PHONE_REQUESTED: "PHONE_REQUESTED",
   PASSWORD_NEW_REQUIRED: "PASSWORD_NEW_REQUIRED",
@@ -25,7 +26,10 @@ export const editProfileSchema = z
         })
         .min(1, editProfileErrors.COUNTRY_REQUIRED),
       streetAddress: z.string().optional(),
-      zipCode: z.string().min(1, editProfileErrors.ZIP_CODE_REQUIRED),
+      zipCode: z
+        .string()
+        .min(1, editProfileErrors.ZIP_CODE_REQUIRED)
+        .regex(/^[A-Za-z0-9-\s]{1,9}$/g, editProfileErrors.ZIP_CODE_INVALID),
     }),
     dateOfBirth: z.string().min(1),
     email: z.string().email(),
diff --git a/apps/scandic-web/components/Forms/Signup/schema.ts b/apps/scandic-web/components/Forms/Signup/schema.ts
index 1225a59c2..d2ab3dfac 100644
--- a/apps/scandic-web/components/Forms/Signup/schema.ts
+++ b/apps/scandic-web/components/Forms/Signup/schema.ts
@@ -15,6 +15,7 @@ export const signupErrors = {
   PASSWORD_REQUIRED: "PASSWORD_REQUIRED",
   TERMS_REQUIRED: "TERMS_REQUIRED",
   ZIP_CODE_REQUIRED: "ZIP_CODE_REQUIRED",
+  ZIP_CODE_INVALID: "ZIP_CODE_INVALID",
 } as const
 
 export const signUpSchema = z.object({
@@ -44,7 +45,10 @@ export const signUpSchema = z.object({
         invalid_type_error: signupErrors.COUNTRY_REQUIRED,
       })
       .min(1, signupErrors.COUNTRY_REQUIRED),
-    zipCode: z.string().min(1, signupErrors.ZIP_CODE_REQUIRED),
+    zipCode: z
+      .string()
+      .min(1, signupErrors.ZIP_CODE_REQUIRED)
+      .regex(/^[A-Za-z0-9-\s]{1,9}$/g, signupErrors.ZIP_CODE_INVALID),
   }),
   password: passwordValidator(signupErrors.PASSWORD_REQUIRED),
   termsAccepted: z
diff --git a/apps/scandic-web/components/HotelReservation/EnterDetails/Details/RoomOne/schema.ts b/apps/scandic-web/components/HotelReservation/EnterDetails/Details/RoomOne/schema.ts
index 5af4f2e5f..14550b0db 100644
--- a/apps/scandic-web/components/HotelReservation/EnterDetails/Details/RoomOne/schema.ts
+++ b/apps/scandic-web/components/HotelReservation/EnterDetails/Details/RoomOne/schema.ts
@@ -23,6 +23,7 @@ export const roomOneErrors = {
   MEMBERSHIP_NO_ONLY_DIGITS: "MEMBERSHIP_NO_ONLY_DIGITS",
   MEMBERSHIP_NO_INVALID: "MEMBERSHIP_NO_INVALID",
   ZIP_CODE_REQUIRED: "ZIP_CODE_REQUIRED",
+  ZIP_CODE_INVALID: "ZIP_CODE_INVALID",
   BIRTH_DATE_REQUIRED: "BIRTH_DATE_REQUIRED",
   BIRTH_DATE_AGE_18: "BIRTH_DATE_AGE_18",
 } as const
@@ -72,7 +73,10 @@ export const notJoinDetailsSchema = baseDetailsSchema.merge(
 export const joinDetailsSchema = baseDetailsSchema.merge(
   z.object({
     join: z.literal<boolean>(true),
-    zipCode: z.string().min(1, roomOneErrors.ZIP_CODE_REQUIRED),
+    zipCode: z
+      .string()
+      .min(1, roomOneErrors.ZIP_CODE_REQUIRED)
+      .regex(/^[A-Za-z0-9-\s]{1,9}$/g, roomOneErrors.ZIP_CODE_INVALID),
     dateOfBirth: z
       .string()
       .min(1, roomOneErrors.BIRTH_DATE_REQUIRED)
diff --git a/apps/scandic-web/components/TempDesignSystem/Form/Input/errors.ts b/apps/scandic-web/components/TempDesignSystem/Form/Input/errors.ts
index 54aae4b62..bf2d4c4b3 100644
--- a/apps/scandic-web/components/TempDesignSystem/Form/Input/errors.ts
+++ b/apps/scandic-web/components/TempDesignSystem/Form/Input/errors.ts
@@ -103,6 +103,12 @@ export function getErrorMessage(intl: IntlShape, errorCode?: string) {
       return intl.formatMessage({
         defaultMessage: "Zip code is required",
       })
+    case roomOneErrors.ZIP_CODE_INVALID:
+    case editProfileErrors.ZIP_CODE_INVALID:
+    case signupErrors.ZIP_CODE_INVALID:
+      return intl.formatMessage({
+        defaultMessage: "The postal code can only contain numbers and letters",
+      })
     case signupErrors.PASSWORD_REQUIRED:
       return intl.formatMessage({
         defaultMessage: "Password is required",