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Weather Delay Schedule Impact Calculator
Weather delays drive 5-15% of construction schedule risk.
Weather delay cost
$49,920
Expected delay days
19.2
Daily combined cost
$2,600
How the math works
Delay days = baseline × weather factor. Cost = days × (overhead + carry).
240 × 8% = 19.2 days × $2,600 = $49,920 weather delay cost.
How to Use
- Enter baseline schedule days.
- Enter weather delay factor %.
- Enter daily overhead cost.
- Enter daily carry cost.
- Read delay cost.
Frequently Asked Questions
Typical weather days?
Northeast: 15-25 days/yr weather-impacted. Midwest: 20-30. South: 10-18 (hurricane + rain). West: 5-15 (rain, snow). Include in baseline schedule — don't plan for perfect weather.
Cost impact?
Daily overhead: 1-3% of monthly contract value = $500-3000/day typical. Daily carry: interest + insurance + storage = $200-1500/day. Add 1-2 weeks weather buffer in scheduled contingency to avoid LD triggers.
Mitigation?
Weather-sensitive work scheduled for dry seasons. Winter work permits enclosed activities only. Acceleration available for lost days (crash cost 1.5-3x premium). Force majeure clauses for extreme events.
Who owns this risk — sponsor or lender?
Construction risks are typically shared: hard-cost overrun owned by sponsor (via completion guaranty), soft-cost and delay risks shared per contract, force-majeure excused but bears owner carry cost. Document risk ownership in the loan agreement and GC contract before closing. Disputes get expensive when roles are unclear. Institutional deals spell out every allocation in writing.
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