Interim valuations and payment certificates value the work done to date and set what is due this cycle. These guides cover what goes into a valuation, how to value preliminaries and variations, and how the certificate feeds the statutory payment timetable.
Assessment dates instead of valuation dates, Price for Work Done to Date instead of measured work, and a payment mechanism that differs by main Option. What a JCT surveyor needs to unlearn.
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Preliminaries are the cost of running the site rather than building the thing: supervision, scaffold, welfare, skips, insurance, power. Priced as their own section they are visible and arguable; smeared across the rates they are invisible and unrecoverable.
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Preliminaries are not a percentage and they do not accrue evenly. Valuing them on the same curve as the works is the quickest way to over or under certify.
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Front-loading moves money forward without changing the contract sum. How it appears in a bill, in an activity schedule and in an application, and what a client-side surveyor can properly do about it.
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Where quantities are approximate, the work is measured as executed and valued at the bill rates. The trap is the rate that stops being reasonable.
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Paying for materials before they reach site is possible under JCT, but only where they are listed and a set of conditions is met. Each one exists for a reason.
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On a fixed price with no fluctuations clause: you do, and no amount of unfairness changes it. What a fluctuations provision would have done, the narrow escapes worth checking before you concede, and how to price the next job in a rising market.
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Unfixed materials are the most common source of interim overpayment. The conditions for certifying them, why off-site materials are treated differently, and what happens on insolvency.
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How QScope assembles each interim valuation from the contract sum, variations, materials on site and retention, dated to the due date under the Construction Act.
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Gross valuation, less retention, less previous payments, less deductions. The order the deductions come off in changes the answer, and the wrong order is surprisingly hard to spot.
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Measured work, variations, materials, fluctuations, loss and expense. What is properly included at interim stage, what waits for the final account, and why the distinction protects you.
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