Change Order Log Impact Calculator

CO volume signals project health.

Contract value

CO count

Total CO value

Schedule impact days

CO % of contract

0.1%

Avg CO size

$52,381

Daily equivalent impact

$48,889

How the math works

CO ratio = total CO value / contract. Avg = total / count. Daily = total / days.

$2.2M / $25M = 8.8% — moderate. 42 COs averaging $52k. Indicates active scope management needed.

How to Use

Enter contract value.
Enter CO count.
Enter total CO value.
Enter schedule impact days.
Read CO burden and ratio.

Frequently Asked Questions

Benchmark ratio?

Healthy construction: 3-6% of contract in CO value. Moderate: 6-10%. High: 10-15%. Above 15%: problematic — scope creep, design errors, or poor bid. Target: <5% with <30 CO count on typical project.

CO type mix?

Owner-directed (scope adds): 40-60% typical. Design errors/omissions: 15-30%. Unforeseen conditions: 10-20%. Contract errors: <5%. Mix informs root cause. Heavy O&O signals poor documents; heavy unforeseen signals due diligence gaps.

Managing?

Weekly CO review meeting. Pre-approval limits for small items. Clear RFI and submittal processes. Design document quality at award. Owner's rep with authority. Each CO costs in review time even when approved — reducing volume helps all.