What is construction cost estimating?

Construction cost estimating is the process of determining the cost of materials and labor for constructing a buliding or other built object such as a dam. It is a skilled and difficult task and considerable experience is needed if an accurate estimate is needed. It would be prudent to use an architect or quantity surveyor to provide an estimate of construction costs for an expensive building. An example of how estimating is done is at the web link below. This clearly shows the difficulty of the task and how many variables must be taken into account.