GATE ZEROGateway 2 Insights

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Gateway 2 delay cost calculator

Put a cost against your programme scenarios using your own figures.

Free to use, no sign-up. Calculator entries and checklist answers stay in your browser and are not sent to Gate Zero. Print a copy before leaving if you want to keep your results.

Your assumptions

The starting figures are an example, not market benchmarks.

Use the average outstanding loan balance, not automatically the entire development cost. Maximum £1 trillion.

Simple annual rate on that balance, from 0% to 100%.

Include only costs caused by the delay. Avoid counting the same cost twice. Maximum £1 billion.

For example, additional design work. This amount is added once to every scenario. Maximum £1 billion.

Choose a scenario from 0 to 120 months. This is your assumption, not a BSR forecast.

Your estimate

How the estimate works

Monthly interest = average drawn debt × annual interest rate ÷ 100 ÷ 12.

Scenario cost = (monthly interest + additional monthly costs) × delay months + one-off costs.

For the example above: £33.8m × 7.5% ÷ 12 = £211,250 interest per month. With £40,000 monthly costs, four months and £90,000 one-off costs, the total is £1,095,000.

Displayed totals are rounded to the nearest pound. This is simple-interest scenario arithmetic. It excludes compounding, changing loan balances, fees not entered, tax, inflation, lost income and contractual claims. It does not estimate the probability of delay or savings from a Gate Zero review.

Read the cost-of-delay guide and BSR charging guide for context. The tool is a planning aid, not financial or legal advice.

Discuss your submission

Ask about a document readiness review against an agreed scope. Customer intake opens after service qualification and an accepted engagement. Gate Zero does not provide BSR approval or design certification. Please do not attach submission documents to your enquiry.

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