Early estimation of building construction speed in Germany

One of the major tasks of construction project management, in addition to determining costs, is an early determination of the construction duration. Construction speed indicators (e.g. m2 gross external floor area/month) can serve as the basis for this determination.The use of a series of independent variables for early estimations of construction speed indicators of German building construction projects is proposed. Based on 200 properties, these variables serve as the speed drivers of a project, and the regression model, tested against the 200 properties, has a mean absolute percentage error of 20%. The identified speed drivers are: project size, number of winters, and planning duration.