Steeltech sheds boast a 10 year guarantee on all sheds and garages, providing peace of mind for our customers. we employ the most experienced staff so all customers can rest assured that they are in good hands from the point of order to the time of delivery.. The steel shed has seen many advances since steeltech first opened its doors. where once there was only one type of steel shed available, now there are numerous different options to choose from, with new concepts constantly being introduced.. Steel sheds antrim steeltech sheds antrim is located on the cushendall road, rathkenny, ballymena, county antrim and is perfect for customers looking for steel sheds in antrim and surrounding areas. steeltech have a complete range of steel sheds, garages, garden rooms, green houses and timber sheds, to suit all tastes and budgets in our antrim.