diff --git a/packages/vite/src/node/build.ts b/packages/vite/src/node/build.ts
index ccf6dab5ee5551..339161192c391e 100644
--- a/packages/vite/src/node/build.ts
+++ b/packages/vite/src/node/build.ts
@@ -1528,6 +1528,7 @@ export type ResolvedBuilderOptions = Required<BuilderOptions>
 
 /**
  * Creates a ViteBuilder to orchestrate building multiple environments.
+ * @experimental
  */
 export async function createBuilder(
   inlineConfig: InlineConfig = {},
diff --git a/packages/vite/src/node/config.ts b/packages/vite/src/node/config.ts
index 5eb1045ef51c65..c3ba03076c6c49 100644
--- a/packages/vite/src/node/config.ts
+++ b/packages/vite/src/node/config.ts
@@ -345,6 +345,7 @@ export interface UserConfig extends DefaultEnvironmentOptions {
   assetsInclude?: string | RegExp | (string | RegExp)[]
   /**
    * Builder specific options
+   * @experimental
    */
   builder?: BuilderOptions
   /**
@@ -564,6 +565,7 @@ export type ResolvedConfig = Readonly<
     esbuild: ESBuildOptions | false
     server: ResolvedServerOptions
     dev: ResolvedDevEnvironmentOptions
+    /** @experimental */
     builder: ResolvedBuilderOptions
     build: ResolvedBuildOptions
     preview: ResolvedPreviewOptions