Construction works accounting in Italian practice

Annex II.14 to the public contracts code places on the direttore dei lavori, the works supervisor, the control of expenditure through the accurate and timely completion of the accounting documents, which are public instruments for all legal purposes and through which expenditure generating events are established and recorded. That qualification has concrete consequences: completion is not an internal administrative formality, and the entries carry evidential weight.

Article 12 of Annex II.14 identifies the accounting documents. The list is exhaustive and each document has its own function.

The procedural chain is linear and worth following in order, because each step presupposes the one before it. No step can be brought forward.

The works supervisor measures the executed work and records it in the libretto delle misure. The measurements are valued in the registro di contabilità by applying the contract rates. From that register the stato di avanzamento lavori is derived, summarising everything executed since the start of the contract and stating the consideration accrued, the instalments already paid and, by difference, the amount of the instalment now due. The works supervisor transmits the interim valuation immediately to the responsabile unico del progetto, the single project officer, who issues the payment certificate. The project officer, having verified the contractor's social security compliance, sends the certificate to the contracting authority for the payment order to be issued. Every payment certificate issued is noted in the register.

The timing and manner in which interim valuations are released are not fixed uniformly by law: they are set out in the tender documents and in the contract, normally by reference to the programme or to the reaching of value thresholds. They must be sought in the tender documents and the contract.

Under a measured contract the accounts apply to the quantities actually executed the net unit rates taken from the schedule of rates, reduced by the discount offered at tender. The original bill remains the benchmark for measuring divergence, but does not by itself determine the sum due.

Under a lump sum contract the consideration is fixed and valuation proceeds by work stage percentages. Here the bill takes on a different and in some ways more delicate role, because the apportionment of those percentages across the parts of the works, built from the bill, governs the rhythm of interim payments.

The accounts are also where the contractor advances its claims. Reservations must be entered in the registro di contabilità on the signature immediately following the occurrence or cessation of the prejudicial event, failing which they lapse, and they must be framed specifically with a precise quantification of the sums claimed. Reservations not expressly confirmed on the final account are treated as waived.

This regime explains why the quality of the accounting records has defensive value for both parties, and why a loosely kept register almost always translates into dispute. A loosely kept register weakens whoever prepared it.

On certification of completion the works supervisor delivers to the project officer a report describing the events of the construction period, and prepares the conto finale dei lavori, which must be signed by the contractor. That signature is the moment at which reservations have to be confirmed: any not expressly restated on the final account are treated as abandoned.

The final account does not by itself close the contract. A final verification of the works follows, whose outcome attests the conformity of what has been built and opens the way to release of the balance and of the securities. The methods and time limits depend on the nature and value of the project and are referred to in the tender documents and the contract.

For the designer who prepared the bill, closure is also the most informative moment of the whole cycle. Comparing measured quantities with those actually valued, read item by item rather than on the total alone, indicates precisely where the estimate held and where it gave way. It is the only form of retrospective check that allows subsequent bills to be calibrated on the practice's own data rather than on market averages.

The regime of Annex II.14 does not apply to private work, but the logic transfers and is worth writing into the contract. Establishing in advance who measures, at what intervals, on which document quantities are recorded and which steps authorise invoicing removes most disputes about progress. Without agreed rules, the argument shifts back to the original quotation, which is never the right instrument for certifying what has been built.