diff --git a/src/video-grid/TileDescriptor.tsx b/src/video-grid/TileDescriptor.tsx
new file mode 100644
index 00000000..cc375284
--- /dev/null
+++ b/src/video-grid/TileDescriptor.tsx
@@ -0,0 +1,32 @@
+/*
+Copyright 2022 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+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 { RoomMember } from "matrix-js-sdk";
+import { CallFeed } from "matrix-js-sdk/src/webrtc/callFeed";
+
+import { ConnectionState } from "../room/useGroupCall";
+
+// Represents something that should get a tile on the layout,
+// ie. a user's video feed or a screen share feed.
+export interface TileDescriptor {
+  id: string;
+  member: RoomMember;
+  focused: boolean;
+  presenter: boolean;
+  callFeed?: CallFeed;
+  isLocal?: boolean;
+  connectionState: ConnectionState;
+}