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Construction Change Order Impact Calculator
Construction change orders rarely come alone — they bring direct cost (scope adds, material upgrades) and indirect cost (schedule slip × monthly carry). Industry typical: 5-10% direct change orders plus 2-5% schedule cost = 7-15% total impact. This calculator quantifies the full burden on the original contract.
Total change-order impact
$476,000
Impact as % of original
8.65%
Direct change orders %
8.00%
Schedule slip cost
$36,000
How the math works
Change orders include direct cost (added scope, material upgrades) and indirect cost (schedule slip × monthly carry). Industry typical 5-10% direct change orders + 2-5% schedule slip cost = 7-15% total impact on original contract.
Strict scope freeze and design completion before mobilization (rather than design-build) cuts change orders 50-70%.
How to Use
- Enter original GC contract amount and cumulative change orders.
- Enter original schedule and schedule slip caused by changes.
- Enter monthly carry cost (loan interest plus daily overhead).
- Read total impact and percentage of original contract.
Frequently Asked Questions
Average change order rate?
Public projects 8-15% (poor scope definition). Private institutional 3-8%. Design-build 5-10%. Owner-driven changes account for 60-70% of total.
Reducing change orders?
Complete design before mobilization (CD set complete, not 80%). Owner decision freeze 30 days before each milestone. Strict change-order approval workflow with cost cap.
Negotiating change orders?
Get cost breakdown: labor hours, material, equipment, overhead/profit %. GC overhead/profit on changes typically 12-20%. Push back on excessive markups.
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