A changed drawing, a site conversation, and a revised invoice may describe the same event in different ways. Months later, that makes it difficult to explain why work changed and what the parties agreed. A variation record should connect the instruction, the work, the price, and any time effect in one traceable sequence.

Find the contractual route for a change

Start with the signed agreement’s instruction, variation, valuation, and notice provisions. Identify who can approve changes and which supporting records are expected. If urgent circumstances arise, record what happened and seek advice on the applicable process promptly. A useful site record does not automatically prove that the person requesting work had authority or that the other party accepted the proposed price.

Describe the difference from the original scope

Reference the original drawing, specification, or quantity and identify the proposed revision. Explain where the changed work occurs, why it is needed, and which other activities it affects. Keep a separate identifier for each change. Combining several unrelated events into one later claim can conceal differences in instructions, evidence, and responsibility that should have been considered separately.

Record cost and time separately

Break down labour, materials, equipment, quantities, and any other claimed components using the contract’s pricing approach. State whether the valuation is agreed, provisional, or disputed. Maintain a separate explanation of the programme effect rather than assuming extra cost proves extra time. Preserve the underlying records so that a reviewer can follow the calculation without relying on a single summary spreadsheet.

Reconcile applications with actual payments

Maintain a ledger of payment applications, supporting submissions, approvals, deductions, invoices, receipts, and bank transfers. Record the stated reason for any disputed amount. A tax invoice, a progress certificate, and a payment receipt answer different questions; keep them linked rather than treating them as interchangeable. Check which company issued or received each document when several entities participate in the project.

Preserve disagreements without rewriting history

Keep original messages, meeting minutes, site records, and document versions. Record corrections transparently and avoid replacing an earlier file with a cleaner account of what happened. If payment remains unresolved, ask counsel about notice obligations, available remedies, and deadlines before suspending work or making deductions. The proper response depends on the contract, facts, and applicable law, not simply the age of an unpaid invoice.

Your working file

What to prepare

  • Assign each change a reference and identify its instruction.
  • Link revised work to the original scope documents.
  • Separate valuation, time effects, approval, and dispute status.
  • Reconcile the payment ledger with original supporting records.

Reference point: PRC Civil Code, contract and construction-project provisions. This article offers general project-record organization, not a prescribed claim procedure. Reviewed September 30, 2026.