diff --git a/backend/internal/common/errors.go b/backend/internal/common/errors.go
index 7062d2c0..cab2ebb2 100644
--- a/backend/internal/common/errors.go
+++ b/backend/internal/common/errors.go
@@ -28,10 +28,10 @@ func (e *AlreadyInUseError) Is(target error) bool {
 	return errors.As(target, &x)
 }
 
-type SetupAlreadyCompletedError struct{}
+type SetupNotAvailableError struct{}
 
-func (e *SetupAlreadyCompletedError) Error() string       { return "setup already completed" }
-func (e *SetupAlreadyCompletedError) HttpStatusCode() int { return http.StatusConflict }
+func (e *SetupNotAvailableError) Error() string       { return "not found" }
+func (e *SetupNotAvailableError) HttpStatusCode() int { return http.StatusNotFound }
 
 type TokenInvalidOrExpiredError struct{}
 
diff --git a/backend/internal/controller/user_signup_controller.go b/backend/internal/controller/user_signup_controller.go
index 4b53c44f..b8c4edf5 100644
--- a/backend/internal/controller/user_signup_controller.go
+++ b/backend/internal/controller/user_signup_controller.go
@@ -7,6 +7,7 @@ import (
 	"github.com/pocket-id/pocket-id/backend/internal/utils/cookie"
 
 	"github.com/gin-gonic/gin"
+	"github.com/pocket-id/pocket-id/backend/internal/common"
 	"github.com/pocket-id/pocket-id/backend/internal/dto"
 	"github.com/pocket-id/pocket-id/backend/internal/middleware"
 	"github.com/pocket-id/pocket-id/backend/internal/service"
@@ -30,6 +31,7 @@ func NewUserSignupController(group *gin.RouterGroup, authMiddleware *middleware.
 	group.GET("/signup-tokens", authMiddleware.Add(), usc.listSignupTokensHandler)
 	group.DELETE("/signup-tokens/:id", authMiddleware.Add(), usc.deleteSignupTokenHandler)
 	group.POST("/signup", rateLimitMiddleware.Add(rate.Every(1*time.Minute), 10), usc.signupHandler)
+	group.GET("/signup/setup", usc.checkInitialAdminSetupAvailable)
 	group.POST("/signup/setup", usc.signUpInitialAdmin)
 
 }
@@ -39,6 +41,21 @@ type UserSignupController struct {
 	appConfigService  *service.AppConfigService
 }
 
+func (usc *UserSignupController) checkInitialAdminSetupAvailable(c *gin.Context) {
+	setupCompleted, err := usc.userSignUpService.IsInitialAdminSetupCompleted(c.Request.Context())
+	if err != nil {
+		_ = c.Error(err)
+		return
+	}
+
+	if setupCompleted {
+		_ = c.Error(&common.SetupNotAvailableError{})
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}
+
 // signUpInitialAdmin godoc
 // @Summary Sign up initial admin user
 // @Description Sign up and generate setup access token for initial admin user
diff --git a/backend/internal/service/user_signup_service.go b/backend/internal/service/user_signup_service.go
index 222e1a01..b733762e 100644
--- a/backend/internal/service/user_signup_service.go
+++ b/backend/internal/service/user_signup_service.go
@@ -124,14 +124,12 @@ func (s *UserSignUpService) SignUpInitialAdmin(ctx context.Context, signUpData d
 		tx.Rollback()
 	}()
 
-	var userCount int64
-	if err := tx.WithContext(ctx).Model(&model.User{}).
-		Where("id != ?", staticApiKeyUserID).
-		Count(&userCount).Error; err != nil {
+	setupCompleted, err := s.isInitialAdminSetupCompleted(ctx, tx)
+	if err != nil {
 		return model.User{}, "", err
 	}
-	if userCount != 0 {
-		return model.User{}, "", &common.SetupAlreadyCompletedError{}
+	if setupCompleted {
+		return model.User{}, "", &common.SetupNotAvailableError{}
 	}
 
 	userToCreate := dto.UserCreateDto{
@@ -161,6 +159,21 @@ func (s *UserSignUpService) SignUpInitialAdmin(ctx context.Context, signUpData d
 	return user, token, nil
 }
 
+func (s *UserSignUpService) IsInitialAdminSetupCompleted(ctx context.Context) (bool, error) {
+	return s.isInitialAdminSetupCompleted(ctx, s.db)
+}
+
+func (s *UserSignUpService) isInitialAdminSetupCompleted(ctx context.Context, db *gorm.DB) (bool, error) {
+	var userCount int64
+	if err := db.WithContext(ctx).Model(&model.User{}).
+		Where("id != ?", staticApiKeyUserID).
+		Count(&userCount).Error; err != nil {
+		return false, err
+	}
+
+	return userCount != 0, nil
+}
+
 func (s *UserSignUpService) ListSignupTokens(ctx context.Context, listRequestOptions utils.ListRequestOptions) ([]model.SignupToken, utils.PaginationResponse, error) {
 	var tokens []model.SignupToken
 	query := s.db.WithContext(ctx).Preload("UserGroups").Model(&model.SignupToken{})
diff --git a/frontend/src/lib/services/user-service.ts b/frontend/src/lib/services/user-service.ts
index c7d69274..230ecdd3 100644
--- a/frontend/src/lib/services/user-service.ts
+++ b/frontend/src/lib/services/user-service.ts
@@ -123,6 +123,10 @@ export default class UserService extends APIService {
 		return res.data as User;
 	};
 
+	checkInitialUserSetupAvailable = async () => {
+		await this.api.get('/signup/setup');
+	};
+
 	listSignupTokens = async (options?: ListRequestOptions) => {
 		const res = await this.api.get('/signup-tokens', { params: options });
 		return res.data as Paginated<SignupToken>;
diff --git a/frontend/src/routes/signup/setup/+page.ts b/frontend/src/routes/signup/setup/+page.ts
new file mode 100644
index 00000000..9be70df0
--- /dev/null
+++ b/frontend/src/routes/signup/setup/+page.ts
@@ -0,0 +1,18 @@
+import { error } from '@sveltejs/kit';
+import UserService from '$lib/services/user-service';
+import { AxiosError } from 'axios';
+import type { PageLoad } from './$types';
+
+export const load: PageLoad = async () => {
+	const userService = new UserService();
+
+	try {
+		await userService.checkInitialUserSetupAvailable();
+	} catch (e) {
+		if (e instanceof AxiosError && e.response?.status === 404) {
+			error(404, 'Not found');
+		}
+
+		throw e;
+	}
+};
diff --git a/tests/specs/user-signup.spec.ts b/tests/specs/user-signup.spec.ts
index 8cb48b30..e178f502 100644
--- a/tests/specs/user-signup.spec.ts
+++ b/tests/specs/user-signup.spec.ts
@@ -81,15 +81,11 @@ test.describe('Initial User Signup', () => {
 		await expect(page.getByText('Set up your passkey')).toBeVisible();
 	});
 
-	test('Initial Signup - setup already completed', async ({ page }) => {
+	test('Initial Signup - setup route unavailable after completion', async ({ page }) => {
 		await cleanupBackend();
 		await page.goto('/setup');
-		await page.getByLabel('First name').fill('Test');
-		await page.getByLabel('Last name').fill('User');
-		await page.getByLabel('Username').fill('testuser123');
-		await page.getByLabel('Email').fill(users.tim.email);
-		await page.getByRole('button', { name: 'Sign Up' }).click();
-		await expect(page.getByText('Setup already completed')).toBeVisible();
+		await expect(page.getByText('Not found')).toBeVisible();
+		await expect(page.getByRole('button', { name: 'Sign Up' })).not.toBeVisible();
 	});
 });