diff --git a/integration-tests/plugins/simplest/tljh_simplest.py b/integration-tests/plugins/simplest/tljh_simplest.py
index 4e03f3c..3c6a3f7 100644
--- a/integration-tests/plugins/simplest/tljh_simplest.py
+++ b/integration-tests/plugins/simplest/tljh_simplest.py
@@ -39,4 +39,10 @@ def tljh_config_post_install(config):
 
 @hookimpl
 def tljh_custom_jupyterhub_config(c):
-    c.JupyterHub.authenticator_class = 'tmpauthenticator.TmpAuthenticator'
\ No newline at end of file
+    c.JupyterHub.authenticator_class = 'tmpauthenticator.TmpAuthenticator'
+
+
+@hookimpl
+def tljh_post_install():
+    with open('test_post_install', 'w') as f:
+        f.write('123456789')
diff --git a/integration-tests/test_simplest_plugin.py b/integration-tests/test_simplest_plugin.py
index 37d17c4..bb07a83 100644
--- a/integration-tests/test_simplest_plugin.py
+++ b/integration-tests/test_simplest_plugin.py
@@ -54,6 +54,7 @@ def test_config_hook():
 
     assert data['simplest_plugin']['present']
 
+
 def test_jupyterhub_config_hook():
     """
     Test that tmpauthenticator is enabled by our custom config plugin
@@ -61,3 +62,13 @@ def test_jupyterhub_config_hook():
     resp = requests.get('http://localhost/hub/tmplogin', allow_redirects=False)
     assert resp.status_code == 302
     assert resp.headers['Location'] == '/hub/spawn'
+
+
+def test_post_install_hook():
+    """
+    Test that the test_post_install file has the correct content
+    """
+    with open("test_post_install") as f:
+        content = f.read()
+
+    assert content == "123456789"
diff --git a/tljh/hooks.py b/tljh/hooks.py
index 8ab8d13..d59f246 100644
--- a/tljh/hooks.py
+++ b/tljh/hooks.py
@@ -58,4 +58,14 @@ def tljh_config_post_install(config):
     be the serialized contents of config, so try to not
     overwrite anything the user might have explicitly set.
     """
+    pass
+
+@hookspec
+def tljh_post_install():
+    """
+    Post install script to be executed after installation
+    and after all the other hooks.
+
+    This can be arbitrary Python code.
+    """
     pass
\ No newline at end of file
diff --git a/tljh/installer.py b/tljh/installer.py
index 3a4ea93..05055e2 100644
--- a/tljh/installer.py
+++ b/tljh/installer.py
@@ -405,6 +405,9 @@ def run_plugin_actions(plugin_manager, plugins):
         ))
         conda.ensure_pip_packages(USER_ENV_PREFIX, user_pip_packages)
 
+    # Custom post install actions
+    hook.tljh_post_install()
+
 
 def ensure_config_yaml(plugin_manager):
     """