Abstract: Self-propelled scaffold for buildings (1) exhibiting a continuously closed contour, wherein the scaffold comprises a framework and a working platform arranged on a horizontal bracket (2) of the framework; as well as a rope tensioner (15) for the scaffold with two clamping units (101, 102) that can be moved with respect to each other and are opened and closed in phase opposition. The scaffolding is associated with at least two sets of jaws (7), respectively connected, with a mutually independent, detachable connection, to an outside face (4) of the building (1), one jaw set (7) being fixedly attached to the scaffolding and the further jaw sets (7) being connected, respectively by a length-variable element, with the first jaw set (7) or with one another.