Clause 12: measurement and evaluation under the 1999 Red Book
Clause 12 governs the manner in which the Works are measured, the process by which the measurement is agreed or disputed, and the basis on which rates are applied and adjusted where the work executed differs from the work billed. On a re-measurement contract it is the clause which ultimately settles the final account.
The navigator carries fifteen analyses arranged in four categories covering measurement, evaluation and valuation principles, and runs from the measurement procedure at Sub-Clause 12.1 to the treatment of omissions at Sub-Clause 12.4.
The provisions placed in the highest band are those which occupy a quantity surveyor in practice: the measurement procedure and the deemed accuracy which follows from it, errors and omissions in the Bill of Quantities, the adjustment of a rate following a variation in quantity, the valuation of varied work at new rates, and the Contractor's recovery of cost on work omitted. Quantities stated in a Bill under this form are expressly estimates rather than warranted figures, and a considerable part of the argument on any re-measurement contract follows from that single point.
The analysis of Sub-Clause 12.1 shows why the procedure is treated in that way. Measurement is intended to be agreed between the Engineer's and the Contractor's representatives as a continuing process during execution, and a Contractor who fails to attend when required, or who fails to dispute the measurement records within fourteen days, is met by a deeming provision. Retrospective measurement at the end of the works, once the work has been covered or has become inaccessible, is the position which then follows.
Entries are banded as high, medium or low risk so that a reader preparing a measurement claim can locate the exposure before opening the contract.
The navigator is based on the 1999 edition of the Red Book and is available to Pro members of SCCSI.