diff --git a/app/jobs/regular/bulk_grant_trust_level.rb b/app/jobs/regular/bulk_grant_trust_level.rb
new file mode 100644
index 00000000000..9302dc6bc1f
--- /dev/null
+++ b/app/jobs/regular/bulk_grant_trust_level.rb
@@ -0,0 +1,17 @@
+module Jobs
+
+  class BulkGrantTrustLevel < Jobs::Base
+
+    def execute(args)
+      trust_level = args[:trust_level]
+      user_ids = args[:user_ids]
+
+      raise Discourse::InvalidParameters.new(:trust_level) if trust_level.blank?
+      raise Discourse::InvalidParameters.new(:user_ids) if user_ids.blank?
+
+      User.where(id: user_ids).find_each do |user|
+        TrustLevelGranter.grant(trust_level, user)
+      end
+    end
+  end
+end
diff --git a/app/models/group.rb b/app/models/group.rb
index 8e457c72de7..56236717738 100644
--- a/app/models/group.rb
+++ b/app/models/group.rb
@@ -414,6 +414,10 @@ class Group < ActiveRecord::Base
       if self.title.present?
         User.where(id: user_ids).update_all(title: self.title)
       end
+
+      if self.grant_trust_level.present?
+        Jobs.enqueue(:bulk_grant_trust_level, user_ids: user_ids, trust_level: self.grant_trust_level)
+      end
     end
     true
   end
diff --git a/app/models/group_user.rb b/app/models/group_user.rb
index df666a0278f..8d1e3beba59 100644
--- a/app/models/group_user.rb
+++ b/app/models/group_user.rb
@@ -55,11 +55,7 @@ class GroupUser < ActiveRecord::Base
 
   def grant_trust_level
     return if group.grant_trust_level.nil?
-    if user.trust_level < group.grant_trust_level
-      user.change_trust_level!(group.grant_trust_level)
-      user.trust_level_locked = true
-      user.save
-    end
+    TrustLevelGranter.grant(group.grant_trust_level, user)
   end
 end
 
diff --git a/app/services/trust_level_granter.rb b/app/services/trust_level_granter.rb
new file mode 100644
index 00000000000..1a826ba18d3
--- /dev/null
+++ b/app/services/trust_level_granter.rb
@@ -0,0 +1,18 @@
+class TrustLevelGranter
+
+  def initialize(trust_level, user)
+    @trust_level, @user = trust_level, user
+  end
+
+  def self.grant(trust_level, user)
+    TrustLevelGranter.new(trust_level, user).grant
+  end
+
+  def grant
+    if @user.trust_level < @trust_level
+      @user.change_trust_level!(@trust_level)
+      @user.trust_level_locked = true
+      @user.save!
+    end
+  end
+end
diff --git a/spec/controllers/admin/groups_controller_spec.rb b/spec/controllers/admin/groups_controller_spec.rb
index 732d07c3ad2..64fd305e0ef 100644
--- a/spec/controllers/admin/groups_controller_spec.rb
+++ b/spec/controllers/admin/groups_controller_spec.rb
@@ -51,9 +51,9 @@ describe Admin::GroupsController do
 
   context ".bulk" do
     it "can assign users to a group by email or username" do
-      group = Fabricate(:group, name: "test", primary_group: true, title: 'WAT')
-      user = Fabricate(:user)
-      user2 = Fabricate(:user)
+      group = Fabricate(:group, name: "test", primary_group: true, title: 'WAT', grant_trust_level: 3)
+      user = Fabricate(:user, trust_level: 2)
+      user2 = Fabricate(:user, trust_level: 4)
 
       xhr :put, :bulk_perform, group_id: group.id, users: [user.username.upcase, user2.email, 'doesnt_exist']
 
@@ -62,10 +62,12 @@ describe Admin::GroupsController do
       user.reload
       expect(user.primary_group).to eq(group)
       expect(user.title).to eq("WAT")
+      expect(user.trust_level).to eq(3)
 
       user2.reload
       expect(user2.primary_group).to eq(group)
-
+      expect(user2.title).to eq("WAT")
+      expect(user2.trust_level).to eq(4)
     end
   end
 
diff --git a/spec/jobs/bulk_grant_trust_level_spec.rb b/spec/jobs/bulk_grant_trust_level_spec.rb
new file mode 100644
index 00000000000..0c8112d3863
--- /dev/null
+++ b/spec/jobs/bulk_grant_trust_level_spec.rb
@@ -0,0 +1,25 @@
+require 'rails_helper'
+require_dependency 'jobs/regular/bulk_grant_trust_level'
+
+describe Jobs::BulkGrantTrustLevel do
+
+  it "raises an error when trust_level is missing" do
+    expect { Jobs::BulkGrantTrustLevel.new.execute(user_ids: [1,2]) }.to raise_error(Discourse::InvalidParameters)
+  end
+
+  it "raises an error when user_ids are missing" do
+    expect { Jobs::BulkGrantTrustLevel.new.execute(trust_level: 0) }.to raise_error(Discourse::InvalidParameters)
+  end
+
+  it "updates the trust_level" do
+    user1 = Fabricate(:user, email: "foo@wat.com", trust_level: 0)
+    user2 = Fabricate(:user, email: "foo@bar.com", trust_level: 2)
+
+    Jobs::BulkGrantTrustLevel.new.execute(trust_level: 3, user_ids: [user1.id,user2.id])
+
+    user1.reload
+    user2.reload
+    expect(user1.trust_level).to eq(3)
+    expect(user2.trust_level).to eq(3)
+  end
+end
diff --git a/spec/services/trust_level_granter_spec.rb b/spec/services/trust_level_granter_spec.rb
new file mode 100644
index 00000000000..b85222c7bea
--- /dev/null
+++ b/spec/services/trust_level_granter_spec.rb
@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+describe TrustLevelGranter do
+
+  describe 'grant' do
+
+    it 'grants trust level' do
+      user = Fabricate(:user, email: "foo@bar.com", trust_level: 0)
+      TrustLevelGranter.grant(3, user)
+
+      user.reload
+      expect(user.trust_level).to eq(3)
+    end
+  end
+end