Advantages
All parties have a clear picture as to the extent of their commitments . It gives a clear breakdown of the cost of all aspects of the project .
The unit rates allow ease of valuation for the stage payments of work carried out and for any variation to the original design .
Disadvantages
Length of time taken in the design and preparation of the Bill of Quantities
Cost of preparation for the Bill of Quantities ( approximatelu 3.5 percent of the contract sum ) .
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