Abstract
Abstract The objectives in each construction process can be multiple. However, the constructions have to be carried out under some restrictions concerning price and terms. They constitute some strategic and interdependent goals. In other words, “time is money”. Several papers support that seasonal effects influence the execution rate of construction. Thus, most of them try to improve the forecasts by evaluating and joining them to the planning, although always measuring their influence indirectly. In this paper, we suggest a methodology to directly measure the influence of the seasonal factors as a whole over the earned value of construction. Additionally, we apply it to a certain case study regarding the subsidised housing of public promotion in the Castilla-La Mancha region (Spain). It is worth mentioning that our results are clarified: we have calculated the average monthly production for each month a year with respect to the annual monthly mean. Moreover, the differences regarding the average monthly production we have contributed are quite significant, and hence they have to be taken into account for each earned value forecast so that a project becomes reliable.
Highlights
By a seasonal factor, we shall understand any pattern which is repeated each year in the same month regardless of its cause
We deal with the following research issue: Do seasonal factors influence the profits in construction projects? It seems that an affirmative answer is obvious
All the conditions are equal, and it is clear that the outcome becomes higher in those months having a large number of working days than in months with a smaller number of working days, and that the outcome becomes lower in bad weather and stormy days than in quiet, warm, and fair-weather days, to quote some examples
Summary
We shall understand any pattern which is repeated each year in the same month regardless of its cause. Climatic factors: They include different hours of light per day, different hours of sunshine, temperature fluctuations, cold spells, frosts, snow, heat spells, heavy rainfalls, storms, heavy winds as well as other weather variables having direct impact on the construction output. These factors will influence the output with different intensities depending on the stage of the project. It is worth noting that the number of working days can vary greatly on a monthly basis
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