diff --git a/packages/angular/build/src/builders/extract-i18n/builder.ts b/packages/angular/build/src/builders/extract-i18n/builder.ts
index 8ade2b0a5609..5e44c31fa516 100644
--- a/packages/angular/build/src/builders/extract-i18n/builder.ts
+++ b/packages/angular/build/src/builders/extract-i18n/builder.ts
@@ -94,7 +94,7 @@ export async function execute(
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     checkFileSystem as any,
     extractionResult.messages,
-    'warning',
+    normalizedOptions.i18nOptions.i18nDuplicateTranslation || 'warning',
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     extractionResult.basePath as any,
   );
diff --git a/packages/angular/build/src/utils/i18n-options.ts b/packages/angular/build/src/utils/i18n-options.ts
index 2482729e7813..9ab7b3aea9b8 100644
--- a/packages/angular/build/src/utils/i18n-options.ts
+++ b/packages/angular/build/src/utils/i18n-options.ts
@@ -6,6 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
+import { DiagnosticHandlingStrategy } from '@angular/localize/tools';
 import path from 'node:path';
 import type { TranslationLoader } from './load-translations';
 
@@ -28,6 +29,7 @@ export interface I18nOptions {
   flatOutput?: boolean;
   readonly shouldInline: boolean;
   hasDefinedSourceLocale?: boolean;
+  i18nDuplicateTranslation?: DiagnosticHandlingStrategy;
 }
 
 function normalizeTranslationFileOption(