Introduction To The Construction & Post-Contract Stage

Section 1

Purpose

Note on JCT editions: JCT has published the 2024 Edition. This guidance cites JCT SBC/Q 2016 clause references; the commercial and payment mechanisms are substantively unchanged in the 2024 edition, but specific clause references should be verified against the contract edition in use on any given project.

RIBA Stage 5 — Construction and Post-Contract Administration is the longest and most commercially intensive stage of the project lifecycle. It spans from site possession through to Practical Completion, during which the QS maintains continuous financial control: certifying monthly interim payments, administering the change control process, updating the Forecast Final Cost and cash flow forecast, advising on contractual notices and claims, and issuing regular cost reports to the client. The quality and rigour of Stage 5 commercial administration determines the outcome of the final account and the employer's exposure to contractor claims.

The Stage 5 QS role is underpinned by two intersecting frameworks: the terms of the building contract (which define the parties' obligations, payment mechanisms, variation procedures, and claims processes) and the Housing Grants, Construction and Regeneration Act 1996 as amended by the Local Democracy, Economic Development and Construction Act 2009 (which imposes statutory payment obligations that override contrary contract terms). Every commercial decision at Stage 5 must be taken with reference to both. The QS must know the contract form and its specific provisions — JCT SBC/Q 2016, JCT DB 2016, NEC4, or other — as the procedural obligations differ materially between forms.

Stage 5 builds directly on the quality of Stage 4 documentation. A well-structured Bill of Quantities or pricing document makes interim valuation straightforward; clearly drafted contract particulars (LADs rate, defects liability period, retention percentage) avoid disputes; a complete change control register from Stage 4 provides the baseline for tracking variations. Conversely, poor Stage 4 documentation — ambiguous pricing documents, incomplete contract particulars, or unresolved pre-contract queries — will generate disputes during construction that consume disproportionate time and cost to resolve.

Section 2

Key Principles

RICS Interim Valuations and Payment (2nd edition, 2015): monthly certification process, components of an interim valuation, payment notice and pay less notice procedures, retention administration, materials on site pre-conditions.
RICS Change Control and Management (1st edition, effective 1 April 2021): definition of change vs variation, seven-step change control process, risk allocation under JCT/NEC/FIDIC, BIM and change management, variation register maintenance.
RICS Valuing Change (current edition): variation valuation hierarchy — contract rates, analogy rates, star rates, daywork; JCT Schedule 2 quotation procedure; NEC compensation event assessment methodology.
RICS Cash Flow Forecasting (2nd edition, July 2024): monthly cash flow updates, S-curve methodology, variance analysis, front-end loading detection, retention profile, cyclical adjustment (Christmas/Easter), drawdown certification.
RICS Cost Reporting (1st edition, 2015): Forecast Final Cost build-up, cost report minimum content, frequency, comparison to budget, risk register integration.
RICS Extensions of Time (1st edition, effective 10 February 2015): Relevant Events (JCT), Compensation Events (NEC4), notice requirements, concurrency, EoT assessment methodology, LADs implications.
Housing Grants, Construction and Regeneration Act 1996 (as amended by LDEDCA 2009): payment due date, final date for payment, payment notices, pay less notices, right to suspend, adjudication — the statutory framework that overrides contract terms.

Section 3

Practical Application

Step 1

Confirm Stage 5 commercial procedures at the pre-start meeting (GN-TD-14): payment cycle dates (valuation date, certification period, final date for payment); variation instruction procedure and change control register format; cost report format and issue frequency; notice procedures under the contract. These procedures must be agreed and documented before any construction work commences.

Step 2

Establish the Stage 5 baseline: confirm the contract sum; set the initial Forecast Final Cost equal to the contract sum; prepare the first cost report with zero variations and zero certified amount; plot the first cash flow S-curve from the contractor's accepted programme.

Step 3

Administer monthly interim payment valuations: visit site before each valuation; measure completed work; agree with contractor's QS where possible; prepare the interim valuation with all components; issue the Payment Notice within 5 days of the valuation date; issue a Pay Less Notice at least 5 days before the final date for payment if deductions are required.

Step 4

Maintain the Forecast Final Cost monthly: start with the contract sum; add all agreed and assessed variations; add all anticipated variations; add the assessed risk allowance; add any assessed loss and expense; compare to the approved budget; report the variance and recommend corrective action if the FFC exceeds the contingency.

Step 5

Operate the change control register: capture every potential change on a Change Request Form before any work commences; obtain contractor's quotation before issuing formal instruction where time permits; instruct only in writing; update the variation register immediately; update the FFC on instruction.

Step 6

Update the cash flow forecast monthly: compare actual certified amounts against the forecast S-curve; investigate variances exceeding 5%; update for agreed variations, programme revisions, and any agreed extension of time; include the updated forecast in the monthly cost report.

Step 7

Maintain the notices register: track all incoming and outgoing contractual notices with their required timescales; check contractor's EoT applications for timeliness and validity; assess L&E claims on receipt; prompt the CA/PM to issue responses within contractual periods; deduct LADs in Pay Less Notices where the contractor is in culpable delay.

Step 8

Attend and contribute to monthly site progress meetings: present the cost report update; walk through the variation register; report on cash flow position; flag approaching contractual deadlines; agree action items with named owners and target dates; review and approve meeting minutes within 24 hours of issue.

Section 4

Common Mistakes to Avoid

Not confirming commercial procedures at the pre-start meeting — ambiguity about payment cycle dates, variation instruction procedures, and reporting format generates disputes from the first valuation onwards.
Missing the Payment Notice deadline — under HGCRA, if no valid Payment Notice is issued within the contractual timescale, the contractor's application becomes the notified sum and must be paid in full, even if it is incorrect.
Certifying without visiting site — the QS is certifying the value of completed work; certifying work that has not been inspected exposes the employer to overpayment and the QS to professional liability.
Allowing uncontrolled variations without formal written instructions — verbal or informal instructions create scope disputes and make the final account significantly harder to settle.
Reporting a cost overrun only when it is too late for the client to take corrective action — the cost report must flag emerging overspends as soon as they are identified, with proposed mitigating actions.

Section 5

APC Competency & Quick Reference

APC Competencies: Contract Administration (L3) | Cost Management (L3) | Commercial Management (L2) | Procurement & Tendering (L1)

What are the QS's primary commercial responsibilities at Stage 5?

Monthly interim payment certification; Forecast Final Cost maintenance and monthly cost reporting; change control and variation register management; cash flow forecast updating; contractual notice monitoring (EoT applications, L&E claims, pay less notices); site progress meeting attendance and commercial reporting. All responsibilities are underpinned by the contract terms and HGCRA 1996 statutory payment obligations. The QS must know which contract form applies — JCT SBC/Q, JCT DB, NEC4 — as procedural obligations differ materially between forms.

What is the HGCRA payment framework and what are the key dates?

The Housing Grants, Construction and Regeneration Act 1996 (as amended 2009) requires construction contracts to provide for: (i) interim/stage payments; (ii) a payment due date (the date the sum becomes payable — typically the valuation date); (iii) a final date for payment (typically 14 days after the due date under JCT SBC/Q); (iv) a payment notice (issued within 5 days of the due date — states the sum the payer considers due); (v) a pay less notice (issued at least 5 days before the final date for payment — states any deduction). If no valid pay less notice is issued, the full notified sum must be paid by the final date for payment.

What is the Forecast Final Cost and how is it built up?

The FFC is the QS's current best estimate of the total project cost at completion. It is built up as: Contract Sum + Agreed Variations (instructed and valued) + Assessed Variations (instructed but not yet agreed) + Anticipated Variations (likely but not yet instructed) + Risk Allowance (probability-weighted residual risks) + Assessed Loss and Expense (if applicable) = FFC. The FFC is compared to the approved budget each month and reported in the cost report. It replaces the Formal Cost Plan as the primary cost management tool once the contract is executed.

Section 6

Construction & Post-Contract Stage Checklist

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Commercial procedures confirmed at pre-start meeting (payment cycle, variation procedure, reporting format)

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Stage 5 baseline established: contract sum confirmed as initial FFC; cash flow S-curve plotted

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Monthly interim payment valuation scheduled; site visit conducted before each valuation

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Payment Notices issued within 5 days of valuation date; Pay Less Notices issued where required

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Forecast Final Cost updated monthly and compared to approved budget

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Change control register operated: all changes captured, instructed in writing, registered

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Cash flow forecast updated monthly against actual certified amounts

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Contractual notices register maintained: EoT applications, L&E claims, pay less notices tracked

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Monthly cost report issued to client (FFC, variation register, risk register, cash flow update)

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Monthly site progress meeting attended; cost report presented; minutes reviewed and approved

Section 7

CPD Learning Outcomes

Describe the full sequence of QS commercial responsibilities at RIBA Stage 5, from pre-start meeting to Practical Completion, and identify the RICS professional standards and HGCRA statutory framework governing each responsibility.
Apply the HGCRA payment framework — payment due date, final date for payment, payment notices, and pay less notices — within the specific contractual mechanisms of JCT SBC/Q 2016 or NEC4, ensuring all statutory and contractual payment obligations are met.
Construct a Forecast Final Cost from the contract sum baseline, incorporating agreed and anticipated variations, risk allowances, and assessed loss and expense, and present it in a cost report with a clear variance analysis against the approved budget.

Section 8