
Fig.1. Different Bodies involved in Estimate Preparation
The preparation of Detailed estimate will require the following elements:
1. The Quantities of the Items involved
2. The cost of the items involved
Quantity Estimate: The quantity estimate is called the method of obtaining the quantities of the items involved in the project.
Rate Analysis: The method of obtaining the unit cost of items involved in the project is called as Rate Analysis.

Note: The Estimation carried out in preliminary stage must be accurate enough to produce the cost of project within 10 to 15% variations

Fig.2.Challenges in Estimation of Construction Projects 
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