Acta Scientiarum Polonorum

The earned value method (EVM) is an increasingly popular tool for controlling the implementation of
construction works, both in material and financial terms. One of the valuable possibilities of this method
is forecasting the cost of final works based on the current progress of works and incurred financial outlays.
However, due to the frequent occurrence of a delay set in the construction contract for the completion of
works, the annex is signed. It may refer to the postponement of the ending date, change of the planned
execution costs or both, simultaneously. The article raises the problem of the impact of changes to the planned
date of completion of works on the calculation of the forecast of its final cost. As shown in the examples, the
method of including changes in the term in the EVM has a significant impact on the result of the forecast.
The article indicates the recommended solution, allowing for the necessary modification of the schedule and
correct estimation of the final cost.