What are the steps to calculate prolongation cost?

Establish entitlement, analyse the delay, price site costs from actual records, add head-office overhead where permitted, then substantiate and submit within notice time bars.

Which head-office overhead formula should I use?

Hudson uses tender percentages, Emden uses actual company figures (widely accepted in UK/Middle East practice), Eichleay is US federal standard. Use only where the contract and law permit.

What evidence does a prolongation claim need?

Baseline and updated programmes with delay analysis, all notices and correspondence, cost records (timesheets, invoices, hire logs), and audited accounts for head-office percentages.

Short #2: How to Calculate Prolongation Cost

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How to Calculate Prolongation Cost in Construction Projects