diff --git a/mautrix_amp/portal.py b/mautrix_amp/portal.py
index 0d61c08..107f39a 100644
--- a/mautrix_amp/portal.py
+++ b/mautrix_amp/portal.py
@@ -341,7 +341,7 @@ class Portal(DBPortal, BasePortal):
         if self.config["bridge.encryption.default"] and self.matrix.e2ee:
             self.encrypted = True
             initial_state.append({
-                "type": "m.room.encryption",
+                "type": str(EventType.ROOM_ENCRYPTION),
                 "content": {"algorithm": "m.megolm.v1.aes-sha2"},
             })
             if self.is_direct:
@@ -353,6 +353,20 @@ class Portal(DBPortal, BasePortal):
                 "type": "m.room.related_groups",
                 "content": {"groups": [self.config["appservice.community_id"]]},
             })
+        initial_state.append({
+            "type": str(EventType.ROOM_POWER_LEVELS),
+            "content": {
+                "users": {
+                    self.az.bot_mxid: 100,
+                    self.main_intent.mxid: 9001,
+                },
+                "events": {},
+                "events_default": 100 if info.readonly else 0,
+                "state_default": 50,
+                "invite": 50,
+                "redact": 0
+            }
+        })
 
         # We lock backfill lock here so any messages that come between the room being created
         # and the initial backfill finishing wouldn't be bridged before the backfill messages.
diff --git a/mautrix_amp/rpc/types.py b/mautrix_amp/rpc/types.py
index d7941f2..cf8138a 100644
--- a/mautrix_amp/rpc/types.py
+++ b/mautrix_amp/rpc/types.py
@@ -41,6 +41,7 @@ class Participant(SerializableAttrs['Participant']):
 @dataclass
 class ChatInfo(ChatListInfo, SerializableAttrs['ChatInfo']):
     participants: List[Participant]
+    readonly: bool
 
 
 @dataclass
diff --git a/puppet/src/puppet.js b/puppet/src/puppet.js
index 033b624..e138ade 100644
--- a/puppet/src/puppet.js
+++ b/puppet/src/puppet.js
@@ -181,6 +181,7 @@ export default class MessagesPuppeteer {
 	 * @typedef ChatInfo
 	 * @type object
 	 * @property {[Participant]} participants
+	 * @property {boolean} readonly
 	 */
 
 	/**
@@ -256,6 +257,7 @@ export default class MessagesPuppeteer {
 		await this.page.click("mw-conversation-menu button")
 		await this.page.waitForSelector(".mat-menu-panel button.mat-menu-item.details",
 			{ timeout: 500 })
+		const readonly = await this.page.$("mw-conversation-container .compose-readonly") !== null
 		// There's a 250ms animation and I don't know how to wait for it properly
 		await sleep(250)
 		await this.page.click(".mat-menu-panel button.mat-menu-item.details")
@@ -267,6 +269,7 @@ export default class MessagesPuppeteer {
 		await this.page.click("mws-dialog mat-dialog-actions button.confirm")
 		return {
 			participants,
+			readonly,
 			...await this.page.$eval(this._listItemSelector(id),
 				elem => window.__mautrixController.parseChatListItem(elem)),
 		}