Representative construction bid margin scenario
Escenario representativo — exposición modelada, no un resultado verificado de cliente.
Problema
A subcontractor prices labor and materials on the base bid but under-reserves for mobilization, inspection cycles, and schedule slip — margin looks intact on paper until field burn catches up.
Conjunto de entradas
- Base contract $620,000, bid margin target 18%
- Crew 8, field burn $2,850/day, 12-day slip risk on critical path
- Allowance $18,000 for rework / re-inspection
Pérdida oculta
Delay burn and re-mobilization are excluded from the headline bid — modeled hidden exposure ~$34,000–$42,000 on this illustrative schedule input.
Schedule & mobilization margin leak
Resultado del cálculo
Headline bid implies ~17.5% margin; loaded field burn and slip reserve pull modeled net margin toward ~11–13% vs the 18% target (representative simulation).
Contract value minus loaded direct cost, schedule-disruption reserve, and remobilization buffer; net margin compared to target band.
Acción sugerida
Increase bid reserve or tighten schedule assumptions before tender submission if modeled net margin falls below target.
Impacto estimado: Modeled margin compression band on this synthetic bid — not verified project savings.
Nota metodológica
Deterministic construction overrun model with user-entered burn and slip days — illustrative framing for bid review, not a guarantee of field outcome.
- Burn rate flat across slip days
- Rework allowance entered explicitly
- Representative scenario — modeled exposure, not a verified customer outcome.
Herramienta relacionada
This case study illustrates how SectorCalc tools structure inputs and surface loss types. It is not financial, legal, or engineering advice. Estimated impact ranges are illustrative only.