diff --git a/migrations/057_team_lock_policy.sql b/migrations/057_team_lock_policy.sql
new file mode 100644
index 0000000..b49b369
--- /dev/null
+++ b/migrations/057_team_lock_policy.sql
@@ -0,0 +1,3 @@
+ALTER TABLE teams
+  ADD COLUMN lock_max_minutes INTEGER NULL,
+  ADD COLUMN lock_force_vault BOOLEAN NOT NULL DEFAULT FALSE;
diff --git a/src/main.rs b/src/main.rs
index f91632f..0fec9ef 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -404,6 +404,10 @@ async fn main() {
                 .layer(middleware::from_fn(features::require_team_invites)),
         )
         .route("/v1/teams/:team_id", delete(routes::teams::delete_team).patch(routes::teams::rename_team))
+        .route(
+            "/v1/teams/:team_id/lock-policy",
+            put(routes::team_lock_policy::set_lock_policy).delete(routes::team_lock_policy::clear_lock_policy),
+        )
         .route(
             "/v1/teams/:team_id/members/:user_id",
             delete(routes::teams::remove_member),
diff --git a/src/routes/mod.rs b/src/routes/mod.rs
index 7e84bec..a99bfcb 100644
--- a/src/routes/mod.rs
+++ b/src/routes/mod.rs
@@ -14,6 +14,7 @@ pub mod resend_webhook;
 pub mod session_codes;
 pub mod sync;
 pub mod team_grants;
+pub mod team_lock_policy;
 pub mod team_sync;
 pub mod team_objects;
 pub mod team_object_prefs;
diff --git a/src/routes/team_lock_policy.rs b/src/routes/team_lock_policy.rs
new file mode 100644
index 0000000..2ddf607
--- /dev/null
+++ b/src/routes/team_lock_policy.rs
@@ -0,0 +1,342 @@
+use axum::{
+    extract::{Path, State},
+    http::StatusCode,
+    Extension, Json,
+};
+use serde::{Deserialize, Serialize};
+use serde_json::json;
+use sqlx::PgPool;
+use tracing::error;
+use uuid::Uuid;
+
+use crate::auth::AuthUser;
+use crate::routes::audit::write_audit_event;
+use crate::routes::teams::{notify_team_members_changed, require_vault_manager};
+use crate::sync_notifier::SyncNotifier;
+use crate::team_plan::require_granular;
+
+const LOCK_MINUTES: [i32; 6] = [0, 5, 15, 30, 60, 240];
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+pub struct LockPolicy {
+    pub max_minutes: i32,
+    pub force_vault: bool,
+}
+
+impl LockPolicy {
+    pub fn from_columns(max_minutes: Option<i32>, force_vault: bool) -> Option<Self> {
+        max_minutes.map(|max_minutes| Self {
+            max_minutes,
+            force_vault,
+        })
+    }
+}
+
+pub async fn set_lock_policy(
+    State(pool): State<PgPool>,
+    Extension(auth): Extension<AuthUser>,
+    Extension(notifier): Extension<SyncNotifier>,
+    Path(team_id): Path<Uuid>,
+    Json(body): Json<LockPolicy>,
+) -> Result<StatusCode, StatusCode> {
+    require_vault_manager(&pool, team_id, auth.0).await?;
+    if !LOCK_MINUTES.contains(&body.max_minutes) {
+        return Err(StatusCode::BAD_REQUEST);
+    }
+    require_granular(&pool, team_id, false).await?;
+    write_policy(&pool, &notifier, team_id, auth.0, Some(body)).await
+}
+
+pub async fn clear_lock_policy(
+    State(pool): State<PgPool>,
+    Extension(auth): Extension<AuthUser>,
+    Extension(notifier): Extension<SyncNotifier>,
+    Path(team_id): Path<Uuid>,
+) -> Result<StatusCode, StatusCode> {
+    require_vault_manager(&pool, team_id, auth.0).await?;
+    require_granular(&pool, team_id, true).await?;
+    write_policy(&pool, &notifier, team_id, auth.0, None).await
+}
+
+async fn write_policy(
+    pool: &PgPool,
+    notifier: &SyncNotifier,
+    team_id: Uuid,
+    actor: Uuid,
+    policy: Option<LockPolicy>,
+) -> Result<StatusCode, StatusCode> {
+    sqlx::query("UPDATE teams SET lock_max_minutes = $2, lock_force_vault = $3 WHERE id = $1")
+        .bind(team_id)
+        .bind(policy.map(|p| p.max_minutes))
+        .bind(policy.is_some_and(|p| p.force_vault))
+        .execute(pool)
+        .await
+        .map_err(|e| {
+            error!(error = %e, team_id = %team_id, "Failed to write team lock policy");
+            StatusCode::INTERNAL_SERVER_ERROR
+        })?;
+    let (action, metadata) = match policy {
+        Some(p) => ("team.lock_policy_set", Some(json!(p))),
+        None => ("team.lock_policy_removed", None),
+    };
+    write_audit_event(
+        pool.clone(),
+        team_id,
+        actor,
+        action,
+        Some("team"),
+        Some(team_id.to_string()),
+        None,
+        metadata,
+    )
+    .await;
+    notify_team_members_changed(pool, notifier, team_id).await;
+    Ok(StatusCode::NO_CONTENT)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::permissions::{PERM_MANAGE_MEMBERS, PERM_MANAGE_VAULT};
+    use crate::routes::teams::list_teams;
+    use crate::sync_notifier::SyncEvent;
+    use crate::test_support::{
+        member_with_role, seed_team_with_roles, seed_user, set_user_tier, BillingMode,
+    };
+
+    async fn listed(pool: &PgPool, team: Uuid, user: Uuid) -> Option<LockPolicy> {
+        let Json(teams) = list_teams(State(pool.clone()), Extension(AuthUser(user)))
+            .await
+            .unwrap();
+        teams
+            .into_iter()
+            .find(|t| t.id == team)
+            .unwrap()
+            .lock_policy
+    }
+
+    #[tokio::test]
+    async fn list_teams_carries_the_stored_policy() {
+        let pool = crate::test_pool_or_skip!();
+        let owner = seed_user(&pool).await;
+        let team = seed_team_with_roles(&pool, owner).await;
+        assert_eq!(listed(&pool, team, owner).await, None);
+
+        sqlx::query(
+            "UPDATE teams SET lock_max_minutes = 15, lock_force_vault = TRUE WHERE id = $1",
+        )
+        .bind(team)
+        .execute(&pool)
+        .await
+        .unwrap();
+
+        assert_eq!(
+            listed(&pool, team, owner).await,
+            Some(LockPolicy {
+                max_minutes: 15,
+                force_vault: true
+            })
+        );
+    }
+
+    async fn put(
+        pool: &PgPool,
+        team: Uuid,
+        user: Uuid,
+        max_minutes: i32,
+        force_vault: bool,
+    ) -> Result<StatusCode, StatusCode> {
+        set_lock_policy(
+            State(pool.clone()),
+            Extension(AuthUser(user)),
+            Extension(SyncNotifier::new()),
+            Path(team),
+            Json(LockPolicy {
+                max_minutes,
+                force_vault,
+            }),
+        )
+        .await
+    }
+
+    async fn clear(pool: &PgPool, team: Uuid, user: Uuid) -> Result<StatusCode, StatusCode> {
+        clear_lock_policy(
+            State(pool.clone()),
+            Extension(AuthUser(user)),
+            Extension(SyncNotifier::new()),
+            Path(team),
+        )
+        .await
+    }
+
+    async fn audit_count(pool: &PgPool, team: Uuid, action: &str) -> i64 {
+        sqlx::query_scalar("SELECT count(*) FROM audit_logs WHERE team_id = $1 AND action = $2")
+            .bind(team)
+            .bind(action)
+            .fetch_one(pool)
+            .await
+            .unwrap()
+    }
+
+    #[tokio::test]
+    async fn owner_sets_and_clears_the_policy_every_member_lists() {
+        let _env = BillingMode::self_hosted();
+        let pool = crate::test_pool_or_skip!();
+        let owner = seed_user(&pool).await;
+        let team = seed_team_with_roles(&pool, owner).await;
+        let member = member_with_role(&pool, team, PERM_MANAGE_MEMBERS).await;
+
+        assert_eq!(
+            put(&pool, team, owner, 15, true).await,
+            Ok(StatusCode::NO_CONTENT)
+        );
+        assert_eq!(
+            listed(&pool, team, member).await,
+            Some(LockPolicy {
+                max_minutes: 15,
+                force_vault: true
+            })
+        );
+        assert_eq!(audit_count(&pool, team, "team.lock_policy_set").await, 1);
+
+        assert_eq!(clear(&pool, team, owner).await, Ok(StatusCode::NO_CONTENT));
+        assert_eq!(listed(&pool, team, member).await, None);
+        assert_eq!(
+            audit_count(&pool, team, "team.lock_policy_removed").await,
+            1
+        );
+        assert_eq!(clear(&pool, team, owner).await, Ok(StatusCode::NO_CONTENT));
+    }
+
+    #[tokio::test]
+    async fn only_values_from_the_auto_lock_list_are_accepted() {
+        let _env = BillingMode::self_hosted();
+        let pool = crate::test_pool_or_skip!();
+        let owner = seed_user(&pool).await;
+        let team = seed_team_with_roles(&pool, owner).await;
+
+        for bad in [-1, 1, 7, 241, 1440] {
+            assert_eq!(
+                put(&pool, team, owner, bad, false).await,
+                Err(StatusCode::BAD_REQUEST),
+                "{bad}"
+            );
+        }
+        for good in [0, 5, 15, 30, 60, 240] {
+            assert_eq!(
+                put(&pool, team, owner, good, false).await,
+                Ok(StatusCode::NO_CONTENT),
+                "{good}"
+            );
+        }
+        assert_eq!(
+            listed(&pool, team, owner).await,
+            Some(LockPolicy {
+                max_minutes: 240,
+                force_vault: false
+            })
+        );
+    }
+
+    #[tokio::test]
+    async fn writing_the_policy_needs_manage_vault() {
+        let _env = BillingMode::self_hosted();
+        let pool = crate::test_pool_or_skip!();
+        let owner = seed_user(&pool).await;
+        let team = seed_team_with_roles(&pool, owner).await;
+        let member = member_with_role(&pool, team, PERM_MANAGE_MEMBERS).await;
+        let manager = member_with_role(&pool, team, PERM_MANAGE_VAULT).await;
+        let outsider = seed_user(&pool).await;
+
+        assert_eq!(
+            put(&pool, team, member, 15, false).await,
+            Err(StatusCode::FORBIDDEN)
+        );
+        assert_eq!(
+            put(&pool, team, outsider, 15, false).await,
+            Err(StatusCode::FORBIDDEN)
+        );
+        assert_eq!(clear(&pool, team, member).await, Err(StatusCode::FORBIDDEN));
+        assert_eq!(
+            put(&pool, team, manager, 30, false).await,
+            Ok(StatusCode::NO_CONTENT)
+        );
+    }
+
+    #[tokio::test]
+    async fn below_business_the_policy_stays_and_can_only_be_removed() {
+        let _env = BillingMode::hosted();
+        let pool = crate::test_pool_or_skip!();
+        let owner = seed_user(&pool).await;
+        set_user_tier(&pool, owner, "teams").await;
+        let team = seed_team_with_roles(&pool, owner).await;
+        sqlx::query("UPDATE teams SET lock_max_minutes = 5 WHERE id = $1")
+            .bind(team)
+            .execute(&pool)
+            .await
+            .unwrap();
+
+        assert_eq!(
+            put(&pool, team, owner, 15, false).await,
+            Err(StatusCode::PAYMENT_REQUIRED)
+        );
+        assert_eq!(
+            listed(&pool, team, owner).await,
+            Some(LockPolicy {
+                max_minutes: 5,
+                force_vault: false
+            })
+        );
+        assert_eq!(clear(&pool, team, owner).await, Ok(StatusCode::NO_CONTENT));
+        assert_eq!(listed(&pool, team, owner).await, None);
+    }
+
+    #[tokio::test]
+    async fn a_business_team_can_set_the_policy_when_hosted() {
+        let _env = BillingMode::hosted();
+        let pool = crate::test_pool_or_skip!();
+        let owner = seed_user(&pool).await;
+        set_user_tier(&pool, owner, "business").await;
+        let team = seed_team_with_roles(&pool, owner).await;
+
+        assert_eq!(
+            put(&pool, team, owner, 60, true).await,
+            Ok(StatusCode::NO_CONTENT)
+        );
+    }
+
+    #[tokio::test]
+    async fn every_member_is_told_the_team_changed() {
+        let _env = BillingMode::self_hosted();
+        let pool = crate::test_pool_or_skip!();
+        let owner = seed_user(&pool).await;
+        let team = seed_team_with_roles(&pool, owner).await;
+        let member = member_with_role(&pool, team, PERM_MANAGE_MEMBERS).await;
+        let notifier = SyncNotifier::new();
+        let mut rx = notifier.subscribe();
+
+        set_lock_policy(
+            State(pool.clone()),
+            Extension(AuthUser(owner)),
+            Extension(notifier),
+            Path(team),
+            Json(LockPolicy {
+                max_minutes: 15,
+                force_vault: false,
+            }),
+        )
+        .await
+        .unwrap();
+
+        let want = format!("team_members:{team}");
+        let mut told = std::collections::HashSet::new();
+        while let Ok(ev) = rx.try_recv() {
+            if let SyncEvent::BlobPushed { user_id, device_id } = ev {
+                if device_id == want {
+                    told.insert(user_id);
+                }
+            }
+        }
+        assert!(told.contains(&owner) && told.contains(&member));
+    }
+}
diff --git a/src/routes/teams.rs b/src/routes/teams.rs
index 1c1c3cd..6abd304 100644
--- a/src/routes/teams.rs
+++ b/src/routes/teams.rs
@@ -173,6 +173,7 @@ pub struct TeamWithRole {
     pub role_ids: Vec<Uuid>,
     pub permission_allow: i64,
     pub permission_deny: i64,
+    pub lock_policy: Option<crate::routes::team_lock_policy::LockPolicy>,
 }
 
 pub async fn list_teams(
@@ -203,6 +204,8 @@ async fn teams_for_user(
         Option<Uuid>,
         i64,
         i64,
+        Option<i32>,
+        bool,
         String,
         Option<chrono::DateTime<chrono::Utc>>,
         bool,
@@ -212,6 +215,7 @@ async fn teams_for_user(
         r#"
         SELECT t.id, t.name, t.owner_id, t.created_at, tmr.role_id,
                COALESCE(o.allow_mask, 0), COALESCE(o.deny_mask, 0),
+               t.lock_max_minutes, t.lock_force_vault,
                {}
         FROM teams t
         JOIN team_members tm ON tm.team_id = t.id AND tm.user_id = $1
@@ -237,6 +241,8 @@ async fn teams_for_user(
         role_id,
         permission_allow,
         permission_deny,
+        lock_max_minutes,
+        lock_force_vault,
         tier,
         trial_ends_at,
         admin_override,
@@ -261,6 +267,7 @@ async fn teams_for_user(
                     role_ids: role_id.into_iter().collect(),
                     permission_allow,
                     permission_deny,
+                    lock_policy: crate::routes::team_lock_policy::LockPolicy::from_columns(lock_max_minutes, lock_force_vault),
                 });
             }
         }
@@ -653,6 +660,14 @@ pub struct RenameTeamRequest {
     pub name: String,
 }
 
+pub(crate) async fn require_vault_manager(pool: &PgPool, team_id: Uuid, user: Uuid) -> Result<(), StatusCode> {
+    let effective = crate::permissions::effective_permissions(pool, team_id, user).await?;
+    if effective & (crate::permissions::PERM_MANAGE_VAULT | crate::permissions::PERM_ADMINISTRATOR) == 0 {
+        return Err(StatusCode::FORBIDDEN);
+    }
+    Ok(())
+}
+
 pub async fn rename_team(
     State(pool): State<PgPool>,
     axum::Extension(auth): axum::Extension<AuthUser>,
@@ -660,10 +675,7 @@ pub async fn rename_team(
     Path(team_id): Path<Uuid>,
     Json(body): Json<RenameTeamRequest>,
 ) -> Result<StatusCode, StatusCode> {
-    let effective = crate::permissions::effective_permissions(&pool, team_id, auth.0).await?;
-    if effective & (crate::permissions::PERM_MANAGE_VAULT | crate::permissions::PERM_ADMINISTRATOR) == 0 {
-        return Err(StatusCode::FORBIDDEN);
-    }
+    require_vault_manager(&pool, team_id, auth.0).await?;
     let name = body.name.trim();
     if name.is_empty() || name.chars().count() > MAX_TEAM_NAME_CHARS {
         return Err(StatusCode::BAD_REQUEST);