Which cost estimating method would be most appropriate for a contractor preparing a preliminary budget estimate for a client during the design development phase?
Correct Answer
D) Assemblies method
During design development, the assemblies method is most appropriate as it provides better accuracy than square foot estimates while not requiring the complete detail needed for quantity takeoffs, which aren't possible without final drawings.
Why This Is the Correct Answer
The assemblies method is ideal for design development phase because it estimates costs using building systems and components (foundations, framing, roofing assemblies) rather than individual materials. This provides reasonable accuracy when architectural drawings show general building systems but lack the detailed specifications needed for precise quantity takeoffs. It balances accuracy with the level of design information available during this intermediate phase.
Why the Other Options Are Wrong
Option A: Detailed quantity takeoff method
Detailed quantity takeoff requires complete construction documents with specific materials, dimensions, and specifications. During design development, drawings lack sufficient detail for accurate material quantities, making this method premature and potentially inaccurate for preliminary budgeting purposes.
Option B: Unit price method
Unit price method requires knowing specific quantities of work items to multiply by unit costs. Since design development drawings don't provide detailed quantities of individual work items, this method cannot be effectively applied at this early design stage.
Option C: Square foot method
Square foot method is too crude for design development phase. While quick, it doesn't account for the building systems and complexity details that are emerging during design development, potentially leading to significant cost variations and inadequate budgeting accuracy.
Memory Technique
Remember 'ASSEMBLIES = ALMOST READY' - during design development, you can see building assemblies/systems but aren't ready for detailed takeoffs yet.
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