Construction surveying device for measuring and marking spatial points (1a, 1b, 1c) in the context of building and/or extending buildings - in particular interior construction - having • a base, • an upper part mounted on the base such that it is rotatable about a rotational axis, • a sighting unit, which is pivotably mounted about a pivot axis on the upper part, provides a distance measuring functionality and has a laser source, configured for emitting a laser beam, and a laser light detector, and • an evaluation and control unit, wherein • a first and a second rotational drive make it possible to drive and align the upper part or the sighting unit, • a spatial alignment of the sighting unit with respect to the base can be captured by means of two goniometers and • the evaluation and control unit is connected to the laser source, the laser light detector and the goniometers in order to associate a captured distance with a corresponding alignment and thereby determine coordinates for spatial points, characterized in that the construction surveying device has a horizontal line projection functionality, which runs at least partly automatically after being triggered, for measuring and marking spatial points (1a, 1b, 1c) along a horizontal line extending in a horizontal plane on an arbitrarily shaped surface, in the context of which, proceeding from a known first spatial point which defines the horizontal plane and after changing the azimuth alignment of the sighting unit, the elevation alignment of the sighting unit is changed, in each case under automatic control by the evaluation and control unit by means of the first and/or the second rotational drive, in such a way that precisely those spatial points which - in the corresponding respective current azimuth alignment - lie on the horizontal line are targeted and marked by the laser beam. • a base, • an upper part mounted on the base such that it is rotatable about a rotational axis, • a sighting unit, which is pivotably mounted about a pivot axis on the upper part, provides a distance measuring functionality and has a laser source, configured for emitting a laser beam, and a laser light detector, and • an evaluation and control unit, wherein • a first and a second rotational drive make it possible to drive and align the upper part or the sighting unit, • a spatial alignment of the sighting unit with respect to the base can be captured by means of two goniometers and • the evaluation and control unit is connected to the laser source, the laser light detector and the goniometers in order to associate a captured distance with a corresponding alignment and thereby determine coordinates for spatial points, characterized in that the construction surveying device has a horizontal line projection functionality, which runs at least partly automatically after being triggered, for measuring and marking spatial points (1a, 1b, 1c) along a horizontal line extending in a horizontal plane on an arbitrarily shaped surface, in the context of which, proceeding from a known first spatial point which defines the horizontal plane and after changing the azimuth alignment of the sighting unit, the elevation alignment of the sighting unit is changed, in each case under automatic control by the evaluation and control unit by means of the first and/or the second rotational drive, in such a way that precisely those spatial points which - in the corresponding respective current azimuth alignment - lie on the horizontal line are targeted and marked by the laser beam.