Construction Substantial Completion Bonus Calculator

Early completion bonuses align GC schedule incentives with owner economics.

Days early

Bonus per day

Bonus cap

Owner carry / day

Owner net benefit

$120,000

Total bonus paid

$240,000

Total carry savings

$360,000

How the math works

Bonus = min(days × per-day, cap). Carry savings = days × owner carry. Net = carry − bonus.

30 × $8k = $240k bonus (under $300k cap). 30 × $12k = $360k carry savings. Net $120k owner.

How to Use

Enter days early.
Enter bonus per day.
Enter bonus cap.
Enter owner carry / day.
Read owner net benefit.

Frequently Asked Questions

Early completion bonus structure?

Owner pays GC $X per day early up to cap. Common: $5–25k/day or $0.5–3% of contract value cap. Pairs with liquidated damages (LDs) for late: $5–25k/day. Symmetric bonus/LD aligns incentives. Best for time-sensitive projects (school open, retail prime season, residential lease-up). Can backfire: GC pushes safety/quality to hit bonus. Standardized: AIA A201-2017 includes optional bonus + LD provisions. Owner self-finances bonus from carrying cost savings (interest, lost revenue).

How does this impact project budget?

Construction budgets layer hard costs (50–65%), soft costs (15–25%), financing (5–10%), contingency (5–10%), and developer fee (3–5%). Schedule risk often equals or exceeds cost risk — every month delay carries carry cost (interest, real estate tax, insurance, opportunity cost) of 0.5–1.5% of project budget. This calculator quantifies one cost component.

Owner-controlled vs GMP vs CM-at-risk?

Lump sum/GMP: contractor takes risk above guaranteed maximum price, owner pays for change orders. CM-at-risk: open book, fee + GMP, more transparent. Construction management: agent for owner, GC subcontracted directly. Design-build: single accountability, faster but less price competition. Match delivery method to project complexity and owner sophistication.

Schedule and cost contingency?

Standard contingency: 10% of hard cost for entitlement, 5–8% for construction. Schedule contingency: 60–90 days buffer past target completion. Force majeure provisions: weather, material lead time, labor strike, permit delay. Track via critical path method (CPM) schedule. Major lender draws contingent on schedule + cost variance to budget remaining within 5%.