Which situation would most likely justify the highest contingency percentage in a construction estimate?
Correct Answer
A) Renovation of a historic building with unknown existing conditions
Historic building renovation with unknown existing conditions presents the highest risk and uncertainty, justifying the highest contingency percentage. Unknown conditions like structural issues, hazardous materials, or code compliance problems can significantly impact costs.
Why This Is the Correct Answer
Historic building renovation with unknown existing conditions presents the highest level of uncertainty and risk in construction projects. These projects often reveal unexpected structural problems, hazardous materials like asbestos or lead paint, outdated electrical and plumbing systems, and compliance issues with modern building codes. The unknown nature of these conditions makes accurate cost estimation extremely difficult, requiring contingency percentages typically ranging from 15-30% or even higher to account for unforeseen discoveries during construction.
Why the Other Options Are Wrong
Option B: Construction using prefabricated building components
Construction using prefabricated building components reduces uncertainty because components are manufactured under controlled conditions with known specifications and costs. The assembly process is standardized and predictable, requiring lower contingency percentages than traditional construction methods.
Option D: Repeat construction of a previously built design
Repeat construction of a previously built design has the lowest risk since all potential issues have been identified and resolved in the original project. Costs are well-established, construction methods are proven, and there are no design unknowns, requiring minimal contingency of 3-7%.
Memory Technique
Think 'HISTORIC = HIDDEN RISKS' - Historic buildings hide the most surprises, requiring the highest contingency protection
Reference Hint
Florida Building Code Chapter 1 - General Provisions, and construction estimating references covering contingency planning and risk assessment
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