Construction Progress Claims: How Quantity Surveyors Value Work

Construction progress claims are contractor requests for payment, not proof that the full amount is due. Before an owner releases funds, the QS must test the claimed value against the contract, the valuation cut-off, the work completed, and the evidence available.

The quantity surveyor checks the cumulative value of eligible work and materials, applies the required adjustments, and gives the certifier a traceable basis for the amount recommended. This protects cash flow without paying ahead of verified progress.

Valuation rules are not universal. Submission dates, measurement methods, retention, stored materials, variations, taxes, notices, and certification authority depend on the executed contract and applicable law. Therefore, the project team should confirm those requirements before the QS assesses any claim.

Start with the contract and the valuation cut-off

The first question is not “What percentage complete is the project?” It is “What does this contract allow at this cut-off?” The payment provisions should identify the format, dates, notices, supporting records, and person authorised to assess or certify payment.

In practice, the cut-off creates a clean boundary. Work completed or materials delivered after it normally belong in the next assessment. An invoice dated before cut-off does not prove that the related work was complete.

RICS practice information on interim valuations and payment treats valuation and payment as contractual processes. It also describes an interim valuation as a revaluation of the work to date, not only the latest month. This lets the QS correct earlier estimates and reconcile amounts already certified.

As a result, a complete submission should show the valuation summary, detailed breakdown, previous certificates, variations, materials, retention, taxes, and net claim. Whatever the required form, another reviewer should be able to reproduce the calculation.

Build an evidence trail before measuring value

A construction payment valuation cannot rely on the claim spreadsheet alone. The QS should compare it with drawings, the bill or schedule of values, instructions, inspection and test records, delivery documents, photographs, and a site inspection close to cut-off.

Accordingly, site evidence should show location, quantity, status, and date. Photographs should identify the work and area; delivery notes should match materials physically present and intended for the project. The QS should record incomplete, defective, rejected, or inaccessible work rather than treat it as complete.

Measure completed work on the agreed basis

Work progress measurement converts physical completion into contract value. A remeasurement contract may use completed quantities and bill rates. A lump-sum or milestone contract may use a schedule of values, activity breakdown, or milestone criteria. The contract determines the method.

Percentage complete should rest on observable quantities or defined criteria. However, programme progress, labour hours, and spending can explain status, but none automatically equals value earned. Testing, documentation, incomplete interfaces, and other contract requirements may produce a different payment value.

The QS should measure cumulatively and deduct the amount previously certified. This separates value earned to date from the current payment and exposes duplicated quantities, front-loading, and earlier valuation errors.

The project team should handle work that does not meet the requirements under the contract’s valuation and certification provisions. The record should identify the item, location, evidence, claimed value, assessed value, and adjustment reason. An unexplained lump-sum deduction is difficult to review and likely to cause dispute.

Test stored materials and preliminaries separately

Materials on and off site

Stored materials are not automatically payable. However, the contract may require delivery to site, proof of ownership, project identification, protection, insurance, invoices, or evidence that title will pass on payment. The contract may also exclude off-site materials unless it specifically lists or secures them through additional controls.

RICS interim valuation guidance advises checking whether the contract permits materials and what prerequisites apply. It treats materials as a separate valuation component that must be checked against the project’s contract requirements.

Therefore, the owner should ask whether project records identify the material, link it to the project, and prove its value, ownership, and protection. Duplicate payment, damage, and diversion risks also need control.

Preliminaries

Meanwhile, preliminaries need their own assessment. Mobilisation, permits, bonds, temporary facilities, supervision, utilities, and demobilisation do not earn value in the same way. The QS may value fixed items when completed and time-related items against the period provided, subject to the contract.

A blanket construction percentage can overpay early or understate extended costs later. The QS should separate fixed, time-related, and performance-dependent value.

Apply retention, variations, and taxes without hiding the bridge

After establishing the gross valuation, the QS applies the contract adjustments. The payment bridge should show work, materials, preliminaries, variations, retention, advance recovery, previous certificates, taxes, and the resulting recommendation.

Retention must follow the project’s rate, cap, exclusions, and release rules. Tax basis, rate, invoice requirements, and inclusive or exclusive presentation should be confirmed against the contract and project tax advice. Neither treatment should be copied from another project.

Finally, separate variations by status. The QS may assess an instructed change while its final price remains under review, but an unsupported proposal may not qualify. The QS should separate entitlement from valuation, use the contract’s rate hierarchy, and prevent double counting against original scope.

This is part of the wider post-contract quantity surveying function, where payment, change, forecast, and final-account records stay aligned.

Turn the claim into an assessed and certifiable amount

In practice, a controlled interim payment claim should move through a visible sequence:

1. Log the claim. Record receipt, valuation cut-off, amount, supporting documents, and contractual deadlines.
2. Check compliance. Confirm the required form, notices, breakdown, signatures, and evidence.
3. Verify progress. Inspect the site and reconcile work status with drawings, records, and the agreed measurement basis.
4. Assess each component. Value eligible work, materials, preliminaries, and variations; then apply retention and other adjustments.
5. Reconcile cumulatively. Compare the gross value to date with previous certificates and calculate the current amount.
6. Record differences. Issue an adjustment schedule that states the claimed amount, assessed amount, and reason for every material change.
7. Support certification. Submit the assessment to the person authorised under the contract and preserve the issued certificate or notice.

The QS assesses value, but the contract determines who certifies, notifies, and approves payment. The team must keep those roles distinct. A clear responsibility matrix and deadline register are basic project-control measures for progress assessment, especially where several approvals sit between the site measure and payment.

Common progress-claim disputes

• The contractor and assessor use different cut-off dates.
• The assessment uses programme percentages as measured value without supporting quantities.
• The claim front-loads early activities beyond the value actually earned.
• The contractor claims materials without proving location, ownership, protection, or eligibility.
• The contractor values time-related preliminaries as a flat percentage of construction work.
• The claim includes variations without a traceable instruction or valuation basis.
• The assessment applies previous certificates, advance recovery, or retention inconsistently.
• The assessment adjusts value without reasons or supporting calculations.

Consequently, most of these disputes begin as control gaps. A shared cut-off, joint site walk, agreed claim template, current variation register, and line-by-line adjustment schedule give both parties a record that both sides can check before positions harden.

Owner checklist before approving payment

• Is the claim valid for this contractual payment cycle?
• Did the QS verify the site status at the stated cut-off date?
• Can the assessment trace completed work to quantities, locations, and contract rates or milestones?
• Do stored materials qualify, remain identifiable and protected, and carry ownership evidence?
• Did the QS assess preliminaries on their actual basis rather than a blanket percentage?
• Does the register separate variations by instruction, entitlement, valuation, and approval status?
• Does the assessment show retention, previous certificates, advance recovery, and taxes clearly?
• Does the certificate or payment notice match the amount supported by the assessment?

An owner does not need to repeat the QS measurement. The owner does need assurance that the process is contract-compliant, independently checked, and supported by an audit trail. Our overview of the quantity surveyor’s role explains how that commercial check connects with the broader project team.

Frequently asked questions

Is the contractor’s claimed amount the amount that must be paid?

Not necessarily. The QS assesses the claim under the contract, and the amount due may change after measurement, evidence checks, retention, prior payments, variations, and other permitted adjustments. Notice and payment deadlines can carry serious consequences, so the project may require contract-specific and legal advice.

Can materials be paid for before installation?

Only where the contract permits it and the project satisfies its conditions. The assessment may need evidence of delivery or approved off-site storage, ownership, insurance, protection, identification, intended incorporation, and value. The requirements vary by contract.

Why can certified value differ from programme progress?

Programme progress tracks time and activity status; certified value follows the contract’s payment rules. Testing, incomplete interfaces, materials, preliminaries, milestone conditions, variations, and non-conforming work can make the two percentages different.

Review the payment controls before the next claim

A defensible progress valuation connects the contract, cut-off date, site evidence, measurement, adjustments, and certificate. If any part of that chain is missing, the owner may pay ahead of progress or delay value that is properly due.

Request an independent review of progress-measurement and payment-assessment controls with GEMS.