diff --git a/app/assets/javascripts/angularjs/controllers/build_lists_controller.js.erb b/app/assets/javascripts/angularjs/controllers/build_lists_controller.js.erb
index 96f1089ea..9d51ec89c 100644
--- a/app/assets/javascripts/angularjs/controllers/build_lists_controller.js.erb
+++ b/app/assets/javascripts/angularjs/controllers/build_lists_controller.js.erb
@@ -45,7 +45,8 @@ RosaABF.controller('BuildListsController', ['$scope', '$http', '$location', '$ti
       // Grouping of build_lists
       _.each(results.build_lists, function(r){
         var bl = new BuildList(r, dictionary);
-        var key = bl.project_id + '-' + bl.commit_hash + '-' + bl.user_id;
+        var key = bl.project_id + '-';
+        key += bl.group_id ? bl.group_id : (bl.commit_hash + '-' + bl.user_id);
         if (groups[key]) {
           groups[key].addRelated(bl);
         } else {
diff --git a/app/controllers/projects/build_lists_controller.rb b/app/controllers/projects/build_lists_controller.rb
index dd6394412..e6f39d222 100644
--- a/app/controllers/projects/build_lists_controller.rb
+++ b/app/controllers/projects/build_lists_controller.rb
@@ -62,6 +62,7 @@ class Projects::BuildListsController < Projects::BaseController
     build_for_platforms = Repository.select(:platform_id).
       where(:id => params[:build_list][:include_repos]).group(:platform_id).map(&:platform_id)
 
+    build_lists = []
     Arch.where(:id => params[:arches]).each do |arch|
       Platform.main.where(:id => build_for_platforms).each do |build_for_platform|
         @build_list = @project.build_lists.build(params[:build_list])
@@ -71,6 +72,7 @@ class Projects::BuildListsController < Projects::BaseController
 
         flash_options = {:project_version => @build_list.project_version, :arch => arch.name, :build_for_platform => build_for_platform.name}
         if authorize!(:create, @build_list) && @build_list.save
+          build_lists << @build_list
           notices << t("flash.build_list.saved", flash_options)
         else
           errors << t("flash.build_list.save_error", flash_options)
@@ -83,6 +85,7 @@ class Projects::BuildListsController < Projects::BaseController
       flash[:error] = errors.join('<br>').html_safe
       render :action => :new
     else
+      BuildList.where(:id => build_lists.map(&:id)).update_all(:group_id => build_lists[0].id) if build_lists.size > 1
       flash[:notice] = notices.join('<br>').html_safe
       redirect_to project_build_lists_path(@project)
     end
diff --git a/app/models/build_list.rb b/app/models/build_list.rb
index 7ddb2a00c..0f8b8cade 100644
--- a/app/models/build_list.rb
+++ b/app/models/build_list.rb
@@ -299,7 +299,7 @@ class BuildList < ActiveRecord::Base
   end
 
   def average_build_time
-    project.project_statistics.where(:arch_id => arch_id).first.try(:average_build_time) || 0
+    project.project_statistics.where(:arch_id => arch_id).pluck(:average_build_time).first || 0
   end
 
   def self.human_status(status)
diff --git a/app/views/projects/build_lists/index.json.jbuilder b/app/views/projects/build_lists/index.json.jbuilder
index 47fa83883..46e5475ef 100644
--- a/app/views/projects/build_lists/index.json.jbuilder
+++ b/app/views/projects/build_lists/index.json.jbuilder
@@ -1,6 +1,6 @@
 now = Time.now.utc
 json.build_lists @build_lists do |build_list|
-  json.(build_list, :id, :status, :project_id, :project_version, :save_to_platform_id, :save_to_repository_id, :user_id, :project_id, :build_for_platform_id, :arch_id)
+  json.(build_list, :id, :status, :project_id, :project_version, :save_to_platform_id, :save_to_repository_id, :user_id, :project_id, :build_for_platform_id, :arch_id, :group_id)
   json.commit_hash build_list.commit_hash.first(5)
   json.last_published_commit_hash build_list.last_published_commit_hash.first(5) if build_list.last_published_commit_hash
 
diff --git a/db/migrate/20130829161042_add_group_id_to_build_list.rb b/db/migrate/20130829161042_add_group_id_to_build_list.rb
new file mode 100644
index 000000000..6662f14b0
--- /dev/null
+++ b/db/migrate/20130829161042_add_group_id_to_build_list.rb
@@ -0,0 +1,5 @@
+class AddGroupIdToBuildList < ActiveRecord::Migration
+  def change
+    add_column :build_lists, :group_id, :integer
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index e64fc12d4..2e0a0ed69 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20130827144022) do
+ActiveRecord::Schema.define(:version => 20130829161042) do
 
   create_table "activity_feeds", :force => true do |t|
     t.integer  "user_id",    :null => false
@@ -136,6 +136,7 @@ ActiveRecord::Schema.define(:version => 20130827144022) do
     t.text     "extra_repositories"
     t.text     "extra_build_lists"
     t.integer  "publisher_id"
+    t.integer  "group_id"
   end
 
   add_index "build_lists", ["advisory_id"], :name => "index_build_lists_on_advisory_id"