diff --git a/changelog.d/8331.misc b/changelog.d/8331.misc
new file mode 100644
index 0000000000..0e1bae20ef
--- /dev/null
+++ b/changelog.d/8331.misc
@@ -0,0 +1 @@
+Use the `admin_patterns` helper in additional locations.
diff --git a/synapse/rest/admin/__init__.py b/synapse/rest/admin/__init__.py
index 1c88c93f38..abf362c7b7 100644
--- a/synapse/rest/admin/__init__.py
+++ b/synapse/rest/admin/__init__.py
@@ -16,13 +16,13 @@
 
 import logging
 import platform
-import re
 
 import synapse
 from synapse.api.errors import Codes, NotFoundError, SynapseError
 from synapse.http.server import JsonResource
 from synapse.http.servlet import RestServlet, parse_json_object_from_request
 from synapse.rest.admin._base import (
+    admin_patterns,
     assert_requester_is_admin,
     historical_admin_path_patterns,
 )
@@ -61,7 +61,7 @@ logger = logging.getLogger(__name__)
 
 
 class VersionServlet(RestServlet):
-    PATTERNS = (re.compile("^/_synapse/admin/v1/server_version$"),)
+    PATTERNS = admin_patterns("/server_version$")
 
     def __init__(self, hs):
         self.res = {
diff --git a/synapse/rest/admin/_base.py b/synapse/rest/admin/_base.py
index d82eaf5e38..db9fea263a 100644
--- a/synapse/rest/admin/_base.py
+++ b/synapse/rest/admin/_base.py
@@ -44,7 +44,7 @@ def historical_admin_path_patterns(path_regex):
     ]
 
 
-def admin_patterns(path_regex: str):
+def admin_patterns(path_regex: str, version: str = "v1"):
     """Returns the list of patterns for an admin endpoint
 
     Args:
@@ -54,7 +54,7 @@ def admin_patterns(path_regex: str):
     Returns:
         A list of regex patterns.
     """
-    admin_prefix = "^/_synapse/admin/v1"
+    admin_prefix = "^/_synapse/admin/" + version
     patterns = [re.compile(admin_prefix + path_regex)]
     return patterns
 
diff --git a/synapse/rest/admin/devices.py b/synapse/rest/admin/devices.py
index 8d32677339..4670d7160d 100644
--- a/synapse/rest/admin/devices.py
+++ b/synapse/rest/admin/devices.py
@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import logging
-import re
 
 from synapse.api.errors import NotFoundError, SynapseError
 from synapse.http.servlet import (
@@ -21,7 +20,7 @@ from synapse.http.servlet import (
     assert_params_in_dict,
     parse_json_object_from_request,
 )
-from synapse.rest.admin._base import assert_requester_is_admin
+from synapse.rest.admin._base import admin_patterns, assert_requester_is_admin
 from synapse.types import UserID
 
 logger = logging.getLogger(__name__)
@@ -32,10 +31,8 @@ class DeviceRestServlet(RestServlet):
     Get, update or delete the given user's device
     """
 
-    PATTERNS = (
-        re.compile(
-            "^/_synapse/admin/v2/users/(?P<user_id>[^/]*)/devices/(?P<device_id>[^/]*)$"
-        ),
+    PATTERNS = admin_patterns(
+        "/users/(?P<user_id>[^/]*)/devices/(?P<device_id>[^/]*)$", "v2"
     )
 
     def __init__(self, hs):
@@ -98,7 +95,7 @@ class DevicesRestServlet(RestServlet):
     Retrieve the given user's devices
     """
 
-    PATTERNS = (re.compile("^/_synapse/admin/v2/users/(?P<user_id>[^/]*)/devices$"),)
+    PATTERNS = admin_patterns("/users/(?P<user_id>[^/]*)/devices$", "v2")
 
     def __init__(self, hs):
         """
@@ -131,9 +128,7 @@ class DeleteDevicesRestServlet(RestServlet):
     key which lists the device_ids to delete.
     """
 
-    PATTERNS = (
-        re.compile("^/_synapse/admin/v2/users/(?P<user_id>[^/]*)/delete_devices$"),
-    )
+    PATTERNS = admin_patterns("/users/(?P<user_id>[^/]*)/delete_devices$", "v2")
 
     def __init__(self, hs):
         self.hs = hs
diff --git a/synapse/rest/admin/purge_room_servlet.py b/synapse/rest/admin/purge_room_servlet.py
index f474066542..8b7bb6d44e 100644
--- a/synapse/rest/admin/purge_room_servlet.py
+++ b/synapse/rest/admin/purge_room_servlet.py
@@ -12,14 +12,13 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-import re
-
 from synapse.http.servlet import (
     RestServlet,
     assert_params_in_dict,
     parse_json_object_from_request,
 )
 from synapse.rest.admin import assert_requester_is_admin
+from synapse.rest.admin._base import admin_patterns
 
 
 class PurgeRoomServlet(RestServlet):
@@ -35,7 +34,7 @@ class PurgeRoomServlet(RestServlet):
     {}
     """
 
-    PATTERNS = (re.compile("^/_synapse/admin/v1/purge_room$"),)
+    PATTERNS = admin_patterns("/purge_room$")
 
     def __init__(self, hs):
         """
diff --git a/synapse/rest/admin/server_notice_servlet.py b/synapse/rest/admin/server_notice_servlet.py
index 6e9a874121..375d055445 100644
--- a/synapse/rest/admin/server_notice_servlet.py
+++ b/synapse/rest/admin/server_notice_servlet.py
@@ -12,8 +12,6 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-import re
-
 from synapse.api.constants import EventTypes
 from synapse.api.errors import SynapseError
 from synapse.http.servlet import (
@@ -22,6 +20,7 @@ from synapse.http.servlet import (
     parse_json_object_from_request,
 )
 from synapse.rest.admin import assert_requester_is_admin
+from synapse.rest.admin._base import admin_patterns
 from synapse.rest.client.transactions import HttpTransactionCache
 from synapse.types import UserID
 
@@ -56,13 +55,13 @@ class SendServerNoticeServlet(RestServlet):
         self.snm = hs.get_server_notices_manager()
 
     def register(self, json_resource):
-        PATTERN = "^/_synapse/admin/v1/send_server_notice"
+        PATTERN = "/send_server_notice"
         json_resource.register_paths(
-            "POST", (re.compile(PATTERN + "$"),), self.on_POST, self.__class__.__name__
+            "POST", admin_patterns(PATTERN + "$"), self.on_POST, self.__class__.__name__
         )
         json_resource.register_paths(
             "PUT",
-            (re.compile(PATTERN + "/(?P<txn_id>[^/]*)$"),),
+            admin_patterns(PATTERN + "/(?P<txn_id>[^/]*)$"),
             self.on_PUT,
             self.__class__.__name__,
         )
diff --git a/synapse/rest/admin/users.py b/synapse/rest/admin/users.py
index f3e77da850..0f537031c4 100644
--- a/synapse/rest/admin/users.py
+++ b/synapse/rest/admin/users.py
@@ -15,7 +15,6 @@
 import hashlib
 import hmac
 import logging
-import re
 from http import HTTPStatus
 
 from synapse.api.constants import UserTypes
@@ -29,6 +28,7 @@ from synapse.http.servlet import (
     parse_string,
 )
 from synapse.rest.admin._base import (
+    admin_patterns,
     assert_requester_is_admin,
     assert_user_is_admin,
     historical_admin_path_patterns,
@@ -60,7 +60,7 @@ class UsersRestServlet(RestServlet):
 
 
 class UsersRestServletV2(RestServlet):
-    PATTERNS = (re.compile("^/_synapse/admin/v2/users$"),)
+    PATTERNS = admin_patterns("/users$", "v2")
 
     """Get request to list all local users.
     This needs user to have administrator access in Synapse.
@@ -105,7 +105,7 @@ class UsersRestServletV2(RestServlet):
 
 
 class UserRestServletV2(RestServlet):
-    PATTERNS = (re.compile("^/_synapse/admin/v2/users/(?P<user_id>[^/]+)$"),)
+    PATTERNS = admin_patterns("/users/(?P<user_id>[^/]+)$", "v2")
 
     """Get request to list user details.
     This needs user to have administrator access in Synapse.
@@ -642,7 +642,7 @@ class UserAdminServlet(RestServlet):
                 {}
     """
 
-    PATTERNS = (re.compile("^/_synapse/admin/v1/users/(?P<user_id>[^/]*)/admin$"),)
+    PATTERNS = admin_patterns("/users/(?P<user_id>[^/]*)/admin$")
 
     def __init__(self, hs):
         self.hs = hs