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Construction Delay Damages Calculator

Every day of construction delay costs money — lost rent, extra carry, LD per contract. This calculator sizes total damages from delay.

Delay days

Lost daily rent

Daily carry cost

Liquidated damages per day

LD cap (contract)

Total delay damages

$315,000

Lost rent

$135,000

Extra carry cost

$67,500

LD owed (capped)

$112,500

How the math works

Total delay damages = lost rent + extra carry + LD (subject to cap). Each adds up independently.

LD is owner's revenue recovery from GC. Lost rent and carry are owner's actual cost. Together they show full economic cost of delay — often 5-10% of project cost on a 6-month delay.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Construction Delay Damages Calculator is built to give a quick, browser-based estimate for construction delay damages. Every day of construction delay costs money — lost rent, extra carry, LD per contract. This calculator sizes total damages from delay. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the construction delay damages result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this construction delay damages estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter delay days.
Enter lost daily rent.
Enter daily carry cost (interest + opex).
Enter contractual liquidated damages rate.
Read total delay damages.

Frequently Asked Questions

What is liquidated damages (LD)?

Contractual penalty in GC contract — GC owes LL fixed $/day past substantial completion. Common: $1-5k/day on mid-size projects; $10-25k/day on large. Limited by contract cap.

Can GC pass through?

Some do via force majeure or owner delay clauses. Institutional LLs remove these clauses aggressively — force majeure is too vague. Document delays carefully to preserve LD rights.

Typical delay on 24-month project?

6-12 weeks is common; 3+ months signals serious issues. Delay beyond contingency = claim territory. Damages on a $20M deal at 4 weeks late: $100-500k range.