Bill of quantities and quantity survey of construction works of renovated buildings - case study

摘要

The article presents detailed analysis of the case of the renovation of one of historic tenement houses in Warsaw. Other, similar cases analyzed in less detail- were called verification cases. The aim of the article was, first of all, to present the scale of discrepancies between planned and performed amount of works and possibly precise indication of the reasons for these underestimations. The scope of the research included the inventory of the technical condition of selected building elements, the execution of bill of quantities, quantity survey and cost estimates of selected works. The conducted research shows that quantity survey of works subjected to analysis such as: repair of walls, chimneys and brick walls reached the value at least twice as large. The planned cost of works calculated on the basis of the event was exceeded approximately twice. This was mainly due to the fact that the impact of repair works on deterioration of the technical condition of existing building elements was not foreseen. The poor technical condition of elements that were covered was not foreseen either. On the basis of the case studied, universal observations about renovated facilities can be provided. First of all, it should be stated that a person who makes bill of quantities on such facilities should have executive experience on similar projects. Thus, a good practice would be a cooperation with a person experienced in the implementation of similar investments.