Exhibition by appointment: Burgisteinstrasse 1, Wattenwil Thierstein Treppen AG is a family business that has been based in Wattenwil near Thun for 26 years. We specialise in the manufacture of staircases made of wood, steel, glass and stone for indoor and outdoor use. Our proximity to timber construction enables us to offer unusual solutions and fulfil your wishes with a wide range of experience. Our working area covers the canton of Bern and neighbouring areas. We attach great importance to providing our customers with honest and competent advice.