diff --git a/package-lock.json b/package-lock.json
index a8e1547..213997a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,7 @@
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+          "url": "https://github.com/sponsors/feross"
+        },
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       "version": "4.2.3",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
       "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "emoji-regex": "^8.0.0",
@@ -8020,7 +8295,6 @@
       "version": "6.2.2",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
       "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=12"
@@ -8033,7 +8307,6 @@
       "version": "6.2.3",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
       "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=12"
@@ -8046,7 +8319,6 @@
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.2.0.tgz",
       "integrity": "sha512-yDPMNjp4WyfYBkHnjIRLfca1i6KMyGCtsVgoKe/z1+6vukgaENdgGBZt+ZmKPc4gavvEZ5OgHfHdrazhgNyG7w==",
-      "dev": true,
       "license": "MIT",
       "dependencies": {
         "ansi-regex": "^6.2.2"
diff --git a/package.json b/package.json
index 17876e0..a537a34 100644
--- a/package.json
+++ b/package.json
@@ -20,6 +20,7 @@
     "@prisma/client": "^7.8.0",
     "@types/nodemailer": "^8.0.1",
     "bcryptjs": "^3.0.3",
+    "googleapis": "^173.0.0",
     "jose": "^6.2.3",
     "jsonwebtoken": "^9.0.3",
     "next": "14.2.35",
diff --git a/src/app/api/admin/turnos/[id]/route.ts b/src/app/api/admin/turnos/[id]/route.ts
index 6c6a693..4eb0615 100644
--- a/src/app/api/admin/turnos/[id]/route.ts
+++ b/src/app/api/admin/turnos/[id]/route.ts
@@ -1,6 +1,7 @@
 import { NextRequest, NextResponse } from "next/server";
 import { prisma } from "@/lib/prisma";
 import { verificarSesion } from "@/lib/auth-admin";
+import { agregarFilaSheet } from "@/lib/google-sheets";
 
 export async function PATCH(req: NextRequest, { params }: { params: Promise<{ id: string }> }) {
   const sesion = await verificarSesion("admin_session");
@@ -15,5 +16,26 @@ export async function PATCH(req: NextRequest, { params }: { params: Promise<{ id
     include: { auto: true, tipoServicio: true, cliente: true },
   });
 
+  if (estado === "COMPLETADO") {
+    try {
+      await agregarFilaSheet({
+        patente: turno.auto.patente,
+        kilometros: turno.kilometros,
+        marca: turno.auto.marca,
+        modelo: turno.auto.modelo,
+        anio: turno.auto.anio,
+        nroChasis: turno.auto.nroChasis,
+        nombre: turno.cliente.nombre,
+        apellido: turno.cliente.apellido,
+        email: turno.cliente.email,
+        telefono: turno.cliente.telefono,
+        fecha: turno.fechaInicio,
+        trabajo: turno.tipoServicio.nombre,
+      });
+    } catch (err) {
+      console.error("Error escribiendo en Google Sheet:", err);
+    }
+  }
+
   return NextResponse.json(turno);
 }
diff --git a/src/lib/google-sheets.ts b/src/lib/google-sheets.ts
new file mode 100644
index 0000000..01cf49f
--- /dev/null
+++ b/src/lib/google-sheets.ts
@@ -0,0 +1,95 @@
+import crypto from "crypto";
+
+const SHEET_ID = process.env.GOOGLE_SHEET_ID!;
+const SHEET_TAB = "Hoja1";
+
+async function getAccessToken(): Promise<string> {
+  const clientEmail = process.env.GOOGLE_CLIENT_EMAIL!;
+  const privateKey = process.env.GOOGLE_PRIVATE_KEY!.replace(/\\n/g, "\n");
+
+  const now = Math.floor(Date.now() / 1000);
+  const header = Buffer.from(JSON.stringify({ alg: "RS256", typ: "JWT" })).toString("base64url");
+  const payload = Buffer.from(
+    JSON.stringify({
+      iss: clientEmail,
+      scope: "https://www.googleapis.com/auth/spreadsheets",
+      aud: "https://oauth2.googleapis.com/token",
+      exp: now + 3600,
+      iat: now,
+    })
+  ).toString("base64url");
+
+  const sign = crypto.createSign("RSA-SHA256");
+  sign.update(`${header}.${payload}`);
+  const signature = sign.sign(privateKey, "base64url");
+
+  const jwt = `${header}.${payload}.${signature}`;
+
+  const res = await fetch("https://oauth2.googleapis.com/token", {
+    method: "POST",
+    headers: { "Content-Type": "application/x-www-form-urlencoded" },
+    body: new URLSearchParams({
+      grant_type: "urn:ietf:params:oauth:grant-type:jwt-bearer",
+      assertion: jwt,
+    }),
+  });
+
+  const data = await res.json() as { access_token: string };
+  return data.access_token;
+}
+
+export interface FilaTaller {
+  patente: string;
+  kilometros: number;
+  marca: string;
+  modelo: string;
+  anio: number;
+  nroChasis?: string | null;
+  nombre: string;
+  apellido: string;
+  email: string;
+  telefono: string;
+  fecha: Date;
+  trabajo: string;
+}
+
+export async function agregarFilaSheet(fila: FilaTaller) {
+  const token = await getAccessToken();
+
+  const fecha = fila.fecha.toLocaleDateString("es-AR", {
+    day: "2-digit",
+    month: "2-digit",
+    year: "numeric",
+  });
+
+  const valores = [
+    fila.patente,
+    fila.kilometros,
+    fila.marca,
+    fila.modelo,
+    fila.anio,
+    fila.nroChasis ?? "",
+    fila.nombre,
+    fila.apellido,
+    fila.email,
+    fila.telefono,
+    fecha,
+    fila.trabajo,
+  ];
+
+  const url = `https://sheets.googleapis.com/v4/spreadsheets/${SHEET_ID}/values/${SHEET_TAB}!A:L:append?valueInputOption=USER_ENTERED`;
+
+  const res = await fetch(url, {
+    method: "POST",
+    headers: {
+      Authorization: `Bearer ${token}`,
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify({ values: [valores] }),
+  });
+
+  if (!res.ok) {
+    const err = await res.text();
+    throw new Error(`Sheets API error: ${err}`);
+  }
+}