diff --git a/packages/http-client-csharp/emitter/src/code-model-writer.ts b/packages/http-client-csharp/emitter/src/code-model-writer.ts
index 994d0bad2e7..5693d2bf253 100644
--- a/packages/http-client-csharp/emitter/src/code-model-writer.ts
+++ b/packages/http-client-csharp/emitter/src/code-model-writer.ts
@@ -20,6 +20,7 @@ export async function writeCodeModel(
   codeModel: CodeModel,
   outputFolder: string,
 ) {
+  await context.program.host.mkdirp(outputFolder);
   await context.program.host.writeFile(
     resolvePath(outputFolder, tspOutputFileName),
     prettierOutput(JSON.stringify(buildJson(context, codeModel), transformJSONProperties, 2)),
@@ -104,6 +105,7 @@ export async function writeConfiguration(
   configurations: Configuration,
   outputFolder: string,
 ) {
+  await context.program.host.mkdirp(outputFolder);
   await context.program.host.writeFile(
     resolvePath(outputFolder, configurationFileName),
     prettierOutput(JSON.stringify(configurations, null, 2)),
diff --git a/packages/http-client-csharp/emitter/test/Unit/emitter.test.ts b/packages/http-client-csharp/emitter/test/Unit/emitter.test.ts
index 6755c79fde1..e9314af1a39 100644
--- a/packages/http-client-csharp/emitter/test/Unit/emitter.test.ts
+++ b/packages/http-client-csharp/emitter/test/Unit/emitter.test.ts
@@ -66,6 +66,7 @@ describe("$onEmit tests", () => {
       hasError: () => false,
       host: {
         writeFile: vi.fn(),
+        mkdirp: vi.fn(),
         rm: vi.fn(),
       },
       tracer: {
@@ -84,6 +85,13 @@ describe("$onEmit tests", () => {
     $onEmit = (await import("../../src/emitter.js")).$onEmit;
   });
 
+  it("should ensure output folder exists before writing files", async () => {
+    const context: EmitContext<CSharpEmitterOptions> = createEmitterContext(program);
+    await $onEmit(context);
+    // writeCodeModel and writeConfiguration each call mkdirp with the output folder
+    expect(program.host.mkdirp).toHaveBeenCalledWith(context.emitterOutputDir);
+  });
+
   it("should apply the update-code-model callback just once", async () => {
     const context: EmitContext<CSharpEmitterOptions> = createEmitterContext(program);
     const updateCallback = vi.fn().mockImplementation((model: CodeModel) => {