diff --git a/bridgev2/matrix/connector.go b/bridgev2/matrix/connector.go
index cdfc2568..aed6d3bd 100644
--- a/bridgev2/matrix/connector.go
+++ b/bridgev2/matrix/connector.go
@@ -81,6 +81,8 @@ type Connector struct {
 
 	MediaConfig             mautrix.RespMediaConfig
 	SpecVersions            *mautrix.RespVersions
+	SpecCaps                *mautrix.RespCapabilities
+	specCapsLock            sync.Mutex
 	Capabilities            *bridgev2.MatrixCapabilities
 	IgnoreUnsupportedServer bool
 
@@ -409,6 +411,21 @@ func (br *Connector) ensureConnection(ctx context.Context) {
 	br.Bot.EnsureAppserviceConnection(ctx)
 }
 
+func (br *Connector) fetchCapabilities(ctx context.Context) *mautrix.RespCapabilities {
+	br.specCapsLock.Lock()
+	defer br.specCapsLock.Unlock()
+	if br.SpecCaps != nil {
+		return br.SpecCaps
+	}
+	caps, err := br.Bot.Capabilities(ctx)
+	if err != nil {
+		br.Log.Err(err).Msg("Failed to fetch capabilities from homeserver")
+		return nil
+	}
+	br.SpecCaps = caps
+	return caps
+}
+
 func (br *Connector) fetchMediaConfig(ctx context.Context) {
 	cfg, err := br.Bot.GetMediaConfig(ctx)
 	if err != nil {
diff --git a/bridgev2/matrix/intent.go b/bridgev2/matrix/intent.go
index 1f82f77f..44dcbc5b 100644
--- a/bridgev2/matrix/intent.go
+++ b/bridgev2/matrix/intent.go
@@ -512,6 +512,39 @@ func (br *Connector) getDefaultEncryptionEvent() *event.EncryptionEventContent {
 	return content
 }
 
+func (as *ASIntent) filterCreateRequestForV12(ctx context.Context, req *mautrix.ReqCreateRoom) {
+	if as.Connector.Config.Homeserver.Software == bridgeconfig.SoftwareHungry {
+		// Hungryserv doesn't override the capabilities endpoint nor do room versions
+		return
+	}
+	caps := as.Connector.fetchCapabilities(ctx)
+	roomVer := req.RoomVersion
+	if roomVer == "" && caps != nil && caps.RoomVersions != nil {
+		roomVer = id.RoomVersion(caps.RoomVersions.Default)
+	}
+	if roomVer != "" && !roomVer.PrivilegedRoomCreators() {
+		return
+	}
+	creators, _ := req.CreationContent["additional_creators"].([]id.UserID)
+	creators = append(slices.Clone(creators), as.GetMXID())
+	if req.PowerLevelOverride != nil {
+		for _, creator := range creators {
+			delete(req.PowerLevelOverride.Users, creator)
+		}
+	}
+	for _, evt := range req.InitialState {
+		if evt.Type != event.StatePowerLevels {
+			continue
+		}
+		content, ok := evt.Content.Parsed.(*event.PowerLevelsEventContent)
+		if ok {
+			for _, creator := range creators {
+				delete(content.Users, creator)
+			}
+		}
+	}
+}
+
 func (as *ASIntent) CreateRoom(ctx context.Context, req *mautrix.ReqCreateRoom) (id.RoomID, error) {
 	if as.Connector.Config.Encryption.Default {
 		req.InitialState = append(req.InitialState, &event.Event{
@@ -527,6 +560,7 @@ func (as *ASIntent) CreateRoom(ctx context.Context, req *mautrix.ReqCreateRoom)
 		}
 		req.CreationContent["m.federate"] = false
 	}
+	as.filterCreateRequestForV12(ctx, req)
 	resp, err := as.Matrix.CreateRoom(ctx, req)
 	if err != nil {
 		return "", err
diff --git a/bridgev2/portal.go b/bridgev2/portal.go
index 7d479be2..8bd66b6a 100644
--- a/bridgev2/portal.go
+++ b/bridgev2/portal.go
@@ -4999,7 +4999,6 @@ func (portal *Portal) createMatrixRoomInLoop(ctx context.Context, source *UserLo
 		IsDirect:           portal.RoomType == database.RoomTypeDM,
 		PowerLevelOverride: powerLevels,
 		BeeperLocalRoomID:  portal.Bridge.Matrix.GenerateDeterministicRoomID(portal.PortalKey),
-		RoomVersion:        id.RoomV11,
 	}
 	autoJoinInvites := portal.Bridge.Matrix.GetCapabilities().AutoJoinInvites
 	if autoJoinInvites {
diff --git a/bridgev2/space.go b/bridgev2/space.go
index f6d07922..2ca2bce3 100644
--- a/bridgev2/space.go
+++ b/bridgev2/space.go
@@ -164,8 +164,7 @@ func (ul *UserLogin) GetSpaceRoom(ctx context.Context) (id.RoomID, error) {
 				ul.UserMXID:             50,
 			},
 		},
-		RoomVersion: id.RoomV11,
-		Invite:      []id.UserID{ul.UserMXID},
+		Invite: []id.UserID{ul.UserMXID},
 	}
 	if autoJoin {
 		req.BeeperInitialMembers = []id.UserID{ul.UserMXID}
diff --git a/bridgev2/user.go b/bridgev2/user.go
index af9e9694..9a7896d6 100644
--- a/bridgev2/user.go
+++ b/bridgev2/user.go
@@ -229,9 +229,8 @@ func (user *User) GetManagementRoom(ctx context.Context) (id.RoomID, error) {
 				user.MXID:                 50,
 			},
 		},
-		RoomVersion: id.RoomV11,
-		Invite:      []id.UserID{user.MXID},
-		IsDirect:    true,
+		Invite:   []id.UserID{user.MXID},
+		IsDirect: true,
 	}
 	if autoJoin {
 		req.BeeperInitialMembers = []id.UserID{user.MXID}