The authors describe systematic geodetic monitoring of wind turbine foundation deformation during the construction period. A comparative analysis of its tilt and wind turbine towers’ structures is performed. Instrumental observations were started immediately after the bedding was arranged and went on in stages until the end of construction, taking into account changes in conditions and load buildup. Based on the results, the deviations were determined and the tilt increments of the wind turbine tower structures were calculated considering the data detected during generator and blade installation. The applied methodology differs from the rules and requirements of regulatory and technical documentation, but allows achieving the accuracy of class I geometric leveling, which meets the criteria for erecting and checking the state of particularly hazardous and technically complex objects. Geodetic control methods are necessary during construction. Systematic monitoring of geometric parameters enables detecting changes and assessment of the rate of degradation processes and determining critical deformations in time, which is extremely important for ensuring the safety and reliability of construction and operation of the facility