diff --git a/quote-handler.php b/quote-handler.php
index 37d1cd0..802729c 100644
--- a/quote-handler.php
+++ b/quote-handler.php
@@ -375,6 +375,60 @@ if (!checkRateLimit()) {
     sendResponse(false, 'Too many requests. Please try again later.');
 }
 
+// reCAPTCHA Verification
+require_once '.recaptcha-config.php';
+
+function validateRecaptcha($token) {
+    if (!RECAPTCHA_ENABLED) {
+        // Skip validation if reCAPTCHA is disabled (test keys)
+        error_log("reCAPTCHA validation skipped - test keys in use");
+        return true;
+    }
+    
+    if (empty($token)) {
+        return false;
+    }
+    
+    $secretKey = RECAPTCHA_SECRET_KEY;
+    $verifyURL = 'https://www.google.com/recaptcha/api/siteverify';
+    
+    $data = [
+        'secret' => $secretKey,
+        'response' => $token,
+        'remoteip' => $_SERVER['REMOTE_ADDR']
+    ];
+    
+    $options = [
+        'http' => [
+            'header' => "Content-type: application/x-www-form-urlencoded\r\n",
+            'method' => 'POST',
+            'content' => http_build_query($data)
+        ]
+    ];
+    
+    $context = stream_context_create($options);
+    $result = file_get_contents($verifyURL, false, $context);
+    
+    if ($result === false) {
+        error_log('reCAPTCHA verification request failed');
+        return false;
+    }
+    
+    $resultJson = json_decode($result, true);
+    
+    if ($resultJson['success'] && isset($resultJson['score'])) {
+        return $resultJson['score'] >= RECAPTCHA_THRESHOLD;
+    }
+    
+    return false;
+}
+
+// Verify reCAPTCHA
+$recaptchaResponse = $_POST['recaptcha_response'] ?? '';
+if (!validateRecaptcha($recaptchaResponse)) {
+    sendResponse(false, 'Security verification failed. Please try again.');
+}
+
 // Spam protection - honeypot field
 if (isset($_POST['website']) && !empty($_POST['website'])) {
     sendResponse(false, 'Spam detected');
diff --git a/quote.php b/quote.php
index 8908650..dcbda5f 100644
--- a/quote.php
+++ b/quote.php
@@ -503,6 +503,8 @@ $canonical_url = "https://ukdataservices.co.uk/quote";
                     $_SESSION['form_start_time'] = time();
                     ?>
                     <input type="hidden" name="csrf_token" value="<?php echo htmlspecialchars($_SESSION['csrf_token']); ?>">
+                    <!-- reCAPTCHA response field -->
+                    <input type="hidden" name="recaptcha_response" id="recaptchaResponseQuote" value="">
                     <!-- Honeypot field for spam protection -->
                     <input type="text" name="website" style="display: none !important; position: absolute !important; left: -9999px !important;" tabindex="-1" autocomplete="off">
                     <!-- Step 1: Project Type -->