Weather Delay Carry Calculator

Weather delays pile up carry. This calculator sizes daily burden.

Loan balance

Loan rate %

Daily standby cost

Weather days

Daily insurance

Total delay cost

$173,209

Interest carry

$76,849

Standby cost

$92,400

How the math works

Daily interest = (balance × rate) ÷ 365. Delay cost = (daily interest + standby + insurance) × weather days.

Schedule concrete pours and weather-sensitive work for shoulder seasons when possible. On a $15M loan at 8.5%, each weather day costs $3,500+ in interest alone before standby. Pulling pour dates into optimal season shaves 10-20 weather days off a project lifecycle, saving meaningful carry dollars.

How to Use

Enter construction loan balance.
Enter loan interest rate %.
Enter daily labor standby cost.
Enter expected weather days.
Enter daily insurance cost.
Read total weather delay cost.

Frequently Asked Questions

Typical weather days?

Spring/fall mid-Atlantic MF project: 15-25 weather days per year. Winter in northern states: 30-60 days. Coastal hurricane seasons: add 5-15 days. Bid documents usually account for 5-10 standard weather days; excess pushes schedule.

Standby cost?

Labor standby (crew show-up without work): $2-8k/day depending on crew size. Superintendent and foreman typically fully paid; crew pays reduce or sent home. Still nets 30-60% of normal day cost.

Contract protections?

AIA standard gives contractor extension but no damages for weather. Owner-friendly contracts limit weather protections. Differentiate 'abnormal weather' (above historical average) vs 'standard weather' (priced in).

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.