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BouwkostenIndex.nl analyzes the construction costs index figures every quarter. The indices are determined for each building type from the BouwkostenKompas website. The different building types are categorized in various sub and main groups. Composite indices are determined on the basis of a weighted average. The different building types each have a weighting factor to determine their importance for the group grade. This weighting factor can change over time. The over-all index for housing is based on calculations, weighing and means of about 1,250 different types.
At bouwkostenindex.nl, a distinction is made between the construction costs index and a procurement index. The construction cost index is an input index, which follows the development of wages, materials, equipment and other parts to be purchased for the realization of a construction. This index tracks the direct purchasing the contractor tries to track (the contractor is the purchaser). The tender index, on the other hand, tries to give a picture of the price at which a contractor sells the realization of the construction work to a client (the clients are the purchaser in this case).
Both types of indexes aim to show a pure price development, cleared of changes in the construction product due to increase in quality and size. To this end, we work with a fixed package of quantities of material, man hours and indirect costs (based on the models from BouwkostenKompas). Changes in quantities, labor productivity and profit rate will not affect these indices, for which the models are revised at various times.
A good example of this is the stricter EPC requirement that January 1. 2011 for housing has been implemented. The requirement has resulted in an average cost increase of 5.5-6.0%. The front models are by means of recalibration corrected for this so that only the actual cost increases as a result of wage cost increases, material and equipment prices can be found in the indices.
The market can also be tracked with a so-called output index. An output index measures the total price and therefore requires a derivation of the quality and quantity of the product. In contrast to an input figure which is corrected for new production methods, innovations, other construction forms, changes in legislation, changing user needs or changes in supply and demand (not corrected for in the tendering index), output figures are not corrected for this.
The table below shows the differences of different indexes.