Mentioned cost data is gross cost data.
The data is including contractor's surcharges and excluding design and engineering costs and value added taxes.

Contractors surcharges are:

• General costs on site;

• General costs;

• Profit and risk.

Cost data can be used only for budget estimating of large projects.

In the various tables, the following abbreviations are used:

• GFA: Gross Floor Area;

• RA: Roof surface area;

• BSA: Building surface area;

• BC: Building Content (volume).
  

The civil and civil-technical cost data are grouped according to the Dutch civil industry NL/SfB classification system.

The list below shows a review of the codes according to the classification system. For more information about the NL/SfB classification system, see the report 'NL/SfB classification system of the Dutch SfB commission' published by the 'Bond van Nederlandse Architecten BNA' in Amsterdam.