The invention relates to a rotating construction laser (1), in particular a self-compensating construction laser. The construction laser (1) comprises a base (2,115) and a laser unit (3,114) for emitting a laser beam (11,83) rotating around an axis (18) of rotation so that the rotating laser beam (11,83) defines a laser plane. Therein, the laser unit (3,114) is built and tiltably arranged to the base (2,115) in such a way, that the axis (18) is tiltable in at least one direction. Furthermore, a tilt sensor (19,96,109) is present for measuring the tilt of the axis (18). According to the invention, the tilt sensor (19,96,109) is supported by a sensor platform being pivotable with respect to the laser unit around the axis (18) between at least two defined pivoting-positions (54,55,70-22) in such a way, that the tilt of the axis (18) is measurable by the tilt sensor (19,96,109) in the at least two pivoting-positions (54,55, 70-22).