diff --git a/kolla/common/config.py b/kolla/common/config.py
index 2d8e17a2f6..526bc706cc 100644
--- a/kolla/common/config.py
+++ b/kolla/common/config.py
@@ -199,6 +199,10 @@ _CLI_OPTS = [
     cfg.StrOpt('format', short='f', default='json',
                choices=['json', 'none'],
                help='Format to write the final results in.'),
+    cfg.StrOpt('summary-json-file',
+               help='Name of a file to write the build summary to when format '
+                    'is json. If unset, the summary will be written to '
+                    'standard output'),
     cfg.StrOpt('tarballs-base', default=TARBALLS_BASE,
                help='Base url to OpenStack tarballs'),
     cfg.IntOpt('threads', short='T', default=8, min=1,
diff --git a/kolla/image/build.py b/kolla/image/build.py
index fdf1635c82..86f0d8a713 100644
--- a/kolla/image/build.py
+++ b/kolla/image/build.py
@@ -11,7 +11,6 @@
 # limitations under the License.
 
 import contextlib
-import json
 import logging
 import queue
 import shutil
@@ -195,8 +194,6 @@ def run_build():
             raise
 
     if conf.summary:
-        results = kolla.summary()
-        if conf.format == 'json':
-            print(json.dumps(results))
+        kolla.summary()
     kolla.cleanup()
     return kolla.get_image_statuses()
diff --git a/kolla/image/kolla_worker.py b/kolla/image/kolla_worker.py
index 1a665ddd44..e7ee355749 100644
--- a/kolla/image/kolla_worker.py
+++ b/kolla/image/kolla_worker.py
@@ -564,6 +564,26 @@ class KollaWorker(object):
                     'name': name,
                 })
 
+        if self.conf.format == 'json':
+
+            def json_summary(f, **kwargs):
+                json.dump(results, f, **kwargs)
+
+            if self.conf.summary_json_file:
+                try:
+                    with open(self.conf.summary_json_file, "w") as f:
+                        json_summary(f, indent=4)
+                except OSError as e:
+                    LOG.error(f'Failed to write JSON build summary to '
+                              '{self.conf.summary_json_file}')
+                    LOG.error(f'Exception caught: {e}')
+                    sys.exit(1)
+
+            else:
+                # NOTE(mgoddard): Keep single line output for
+                # backwards-compatibility.
+                json_summary(sys.stdout)
+
         return results
 
     def get_image_statuses(self):
diff --git a/kolla/tests/test_build.py b/kolla/tests/test_build.py
index eb42595b8b..5b748ef13a 100644
--- a/kolla/tests/test_build.py
+++ b/kolla/tests/test_build.py
@@ -727,6 +727,53 @@ class KollaWorkerTest(base.TestCase):
         self.assertEqual('error', results['failed'][0]['status'])  # bad
         self.assertEqual('error', results['failed'][1]['status'])  # bad2
 
+    @mock.patch('json.dump')
+    def test_summary_json_format(self, dump_mock):
+        self.conf.set_override('format', 'json')
+        kolla = build.KollaWorker(self.conf)
+        kolla.images = self.images
+        kolla.image_statuses_good['good'] = build.Status.BUILT
+        kolla.image_statuses_bad['bad'] = build.Status.ERROR
+        kolla.image_statuses_allowed_to_fail['bad2'] = build.Status.ERROR
+        kolla.image_statuses_unmatched['unmatched'] = build.Status.UNMATCHED
+        results = kolla.summary()
+        dump_mock.assert_called_once_with(results, sys.stdout)
+
+    @mock.patch('json.dump')
+    def test_summary_json_format_file(self, dump_mock):
+        tmpdir = tempfile.mkdtemp()
+        file_path = os.path.join(tmpdir, 'summary.json')
+        try:
+            self.conf.set_override('format', 'json')
+            self.conf.set_override('summary_json_file', file_path)
+            kolla = build.KollaWorker(self.conf)
+            kolla.images = self.images
+            kolla.image_statuses_good['good'] = build.Status.BUILT
+            kolla.image_statuses_bad['bad'] = build.Status.ERROR
+            kolla.image_statuses_allowed_to_fail['bad2'] = build.Status.ERROR
+            kolla.image_statuses_unmatched['unmatched'] = (
+                build.Status.UNMATCHED)
+            results = kolla.summary()
+            dump_mock.assert_called_once_with(results, mock.ANY, indent=4)
+            self.assertEqual(dump_mock.call_args[0][1].name, file_path)
+        finally:
+            os.remove(file_path)
+            os.rmdir(tmpdir)
+
+    @mock.patch('builtins.open')
+    def test_summary_json_format_file_error(self, open_mock):
+        open_mock.side_effect = OSError
+        self.conf.set_override('format', 'json')
+        self.conf.set_override('summary_json_file', 'fake-file')
+        kolla = build.KollaWorker(self.conf)
+        kolla.images = self.images
+        kolla.image_statuses_good['good'] = build.Status.BUILT
+        kolla.image_statuses_bad['bad'] = build.Status.ERROR
+        kolla.image_statuses_allowed_to_fail['bad2'] = build.Status.ERROR
+        kolla.image_statuses_unmatched['unmatched'] = (
+            build.Status.UNMATCHED)
+        self.assertRaises(SystemExit, kolla.summary)
+
     @mock.patch('shutil.copytree')
     def test_work_dir(self, copytree_mock):
         self.conf.set_override('work_dir', 'tmp/foo')
diff --git a/releasenotes/notes/summary-json-file-96441e67076fc480.yaml b/releasenotes/notes/summary-json-file-96441e67076fc480.yaml
new file mode 100644
index 0000000000..d6ff5928eb
--- /dev/null
+++ b/releasenotes/notes/summary-json-file-96441e67076fc480.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Adds support for writing the build summary to a JSON file specified via the
+    ``[DEFAULT] summary_json_file`` option.