These are quantities included in the BoQ for works whose nature and scope cannot be entirely foreseen or defined at the time of tendering. The principle and purpose are similar to those described for the pc sums and the provisional sums except that here, a quantity defined as provisional is stated/included in the BoQ. With an expectation that the quantity may be more or less. However, what is fairly certain is the condition under which the are to be performed. But there is a great uncertainty regarding the quantum of work which is subject to re-measurement when the work have been performed on site.
Iyoha Alison
Building student
University of Jos
Plateau state Nigeria
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