When using the assemblies cost estimating method, what is the primary advantage over detailed unit cost estimating?
Correct Answer
B) It reduces estimating time while maintaining reasonable accuracy
The assemblies method groups related components together (like wall assemblies), which speeds up the estimating process while still providing good accuracy for conceptual estimates. It's faster than detailed takeoffs but more accurate than square foot methods.
Why This Is the Correct Answer
The assemblies cost estimating method's primary advantage is that it significantly reduces the time required for estimating while maintaining reasonable accuracy for preliminary and conceptual estimates. This method groups related building components together (such as exterior wall assemblies that include framing, sheathing, insulation, and siding) rather than estimating each individual component separately. It strikes an optimal balance between the speed of square footage methods and the accuracy of detailed unit cost estimating, making it ideal for early project phases when quick but reasonably accurate estimates are needed.
Why the Other Options Are Wrong
Option A: It provides more accurate material quantities
While assemblies estimating provides good accuracy, it doesn't necessarily provide more accurate material quantities than detailed unit cost estimating - in fact, detailed estimating typically provides more precise material quantities since it breaks down every individual component
Option C: It automatically includes all labor productivity factors
The assemblies method does not eliminate the need for contingency allowances - contingencies are still necessary to account for unforeseen conditions, design changes, and market fluctuations regardless of the estimating method used
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