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In construction practice, contractually agreed costs are often exceeded, which interferes with the sustainable realization of construction projects. The research described in this paper covers 24 new construction, renovation and reconstruction projects in the Republic of Croatia realized in the years 2006 to 2017, in order to analyse the occurrence of cost overruns more precisely with regard to the source of the overruns. It was found that additional work is the main source of cost overruns: firstly, additional work as a result of the client’s change orders and then unforeseen construction work as a result of unforeseen circumstances. As for the additional works, they are carried out at the client’s request and are not necessary for the safety and stability of the building. Using linear regression and “soft computing” methods, the possibility of modelling the relationship between contractually agreed and realized construction costs with satisfactory accuracy was tested. The model with the values of the natural logarithms of the variables, modelled according to the time–cost model of Bromilow, proved to be of the highest accuracy.

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The comparison of the traditional (budget-funded) public building procurement model with the public private partnership (non-budget funded) model is presented in the paper. Public service buildings procured based on the traditional model and those procured according to the PPP model are compared in the scope of research involving nine buildings realized in the Republic of Croatia. The results point to greater efficiency of the PPP model in the construction of public service buildings, with regard to both cost and time of construction work. Utjecaj načina financiranja na troškovno-vremenske aspekte javnih i društvenih građevinaU radu je prikazana usporedba tradicionalnog (proračunskog) modela nabave javnih i društvenih građevina s modelom javno-privatnog partnerstva (neproračunski model). Istraživanjem kojim je obuhvaćeno devet izgrađenih građevina s područja Republike Hrvatske, usporedno su analizirane javne i društvene građevine isporučene tradicionalno i po modelu JPP-a. Rezultati pokazuju veću efikasnost JPP modela u izgradnji javnih i društvenih građevina unutar planiranog proračuna i roka građenja. Ključne riječi: tradicionalni model nabave, JPP, javne i društvene građevine, troškovi, rok građenja Übersichtsarbeit Ksenija Tijanić, Diana Car-Pušić, Ksenija Čulo Auswirkungen der Art der Finanzierung auf die Kosten-Zeit-Aspekte öffentlicher und sozialer BautenIn der Abhandlung wird der Vergleich des traditionellen (Haushalts-)Modells der Beschaffung öffentlicher und sozialer Bauten mit dem Modell der öffentlich-privaten Partnerschaft (Nicht-Haushalts-Modell) dargelegt. Bei der Untersuchung, mit welcher neun errichtete Gebäude auf dem Gebiet der Republik Kroatien umfasst wurden, wurden parallel öffentliche und soziale Bauten, die auf traditionelle und nach dem ÖPP-Modell ausgeliefert wurden, analysiert. Die Ergebnisse zeigen eine höhere Effizienz bei den ÖPP-Modellen beim Bau öffentlicher und sozialer Gebäude innerhalb des geplanten Haushalts und der Baufrist.

The Analytical Hierarchy Process (AHP) and PROMETHEE have gained increasing attention in the field of construction management as techniques for the analysis of complex situations and as decision support for decision makers. However, these two methods in themselves or their potential applications to problems of construction management are not sufficiently defined in the existing literature. The environment of group decision-making bring even more challenges. This paper consolidates and critically discusses the current knowledge on the application of AHP and PROMETHEE methods in the light of the specifics of the construction industry. A systematic literature review was used to select the contributions indexed in the databases Scopus and Web of Science. The findings indicate that the studies deal with broad topics and different aspects in different phases of civil engineering projects. This paper provides a useful reference work for researchers and practitioners interested in the application of AHP and PROMEETHEE as tools for group decision-making in civil engineering.