The client's construction budget in Italy: setting it, checking it, holding it

Each moment has its risk and its lever, and each lever has a source. The last two columns give the text the client can rely on, private and public.

Moment	Main risk	Client's lever	Private	Public
A. Setting the budget	Budget given orally, undated, limited to the works alone	Write a dated, complete spending limit into the appointment, with an explicit contingency	D.L. 1/2012, art. 9(4) (estimate and foreseeable costs in writing)	Allegato I.7, art. 3(g) (economic limits in the DIP) and art. 5(2) (contingencies)
B. Checking the estimate	Optimistic estimate discovered only when the bids are opened	Require the estimate documents at every stage and compare them on the same basis	No legal obligation: the documents are requested by contract	Allegato I.7, art. 6 and 22; D.Lgs. 36/2023, art. 42 (verification and validation)
C. Awarding the works	Bids above the budget, bids that are too low	Compare on the same basis; do not award where the tender notice provides for it	Freedom to negotiate and to retender	D.Lgs. 36/2023, art. 14, 108(9) and (10), art. 110
D. Tracking the works	Unauthorised variations, price increases, contractor claims	Written authorisation before execution; forecast of final cost at every SAL	Civil code, art. 1659, 1660, 1661, 1664 and 1671	D.Lgs. 36/2023, art. 60, 120, 123, 125 and 210; Allegato II.14, art. 5
E. Choosing who controls cost	Blurred roles, nobody answerable for cost	Allocate by contract the tasks of deciding, designing, estimating, directing and organising	Appointment contracts; D.Lgs. 81/2008, art. 90	D.Lgs. 36/2023, art. 15 and 114

The first two moments cost the least and pay back the most. Correcting a brief on a feasibility study costs a design revision; correcting it on site costs variations, time and often disputes. The further the project goes, the dearer each euro saved.

The private client and the public contracting authority follow different rules but face the same five moments. For the private client, the rules are those of the appalto (building contract) in the civil code (book IV, title III, chapter VII, "Dell'appalto") and those it writes into its own contracts. For a public body, the reference is the public contracts code, D.Lgs. 31 marzo 2023, n. 36 (Legislative Decree 36 of 31 March 2023), with its annexes, in the version incorporating the corrective decree D.Lgs. 209/2024.

The basic difference is the budget document. In public works the budget is a regulated document: the DIP (documento di indirizzo alla progettazione, the design brief) sets out the economic limits, the quadro economico (the project cost breakdown) splits works from the sums held at the authority's disposal, and the RUP (responsabile unico del progetto, the single project manager on the authority's side) is answerable for it throughout the cycle. In a private project no document is mandatory: the budget exists only if the client writes it, and is worth only as much as the contract containing it. A note on vocabulary: the contractor is the "appaltatore" in a private contract and the "esecutore" in a public one; "budget" is the everyday word, "limite di spesa" (spending limit) the one to write into the contract.

The budget is an input to the design, not the result of the drawings. A client who asks the progettista (the designer) "how much will it cost" once the design is drawn has given up its main lever. A client who sets the spending limit first can require the design to respect it, and argue on a written basis when the estimate exceeds it. The branch Setting the budget before design develops this moment.

In the public sector, the limit is imposed by law. The design brief must state "the economic limits to be respected and any indication of the financial cover for the works" (Allegato I.7, art. 3(g); unofficial translation, as are all quotations in this guide).

In the private sector, no rule imposes it: the appointment contract must say so. The law does give the client a practical hook. With the fee scales of the regulated professions abolished (D.L. 1/2012, art. 9(1)), the professional must inform the client of the degree of complexity of the engagement, "all useful information about the foreseeable costs" from the appointment to its completion, and the fee by means of an outline estimate, "compulsorily, in written or digital form" (art. 9(4)). That is the right moment to write the spending limit for the works alongside the fee.

The professional client has an additional constraint. Law no. 49 of 21 April 2023 on equo compenso (fair remuneration) applies to banks and insurers, to companies that in the previous year had more than 50 workers or annual revenue above 10 million euros, and to the public administration (art. 2). For these clients the designer's fee cannot be the variable that balances the budget.

The works budget is not the project budget. The first covers the amount to be paid to contractors. The second adds everything the client will pay in any case: design, works direction and acceptance testing, health and safety coordination, surveys, utility connections, the contributo di costruzione (building levy) and the charges of the building permit, VAT, financing costs, a contingency for unforeseen events, any price revision, and the effect of building tax incentives on the actual spend.

Some of these costs are the client's own obligations. Where more than one contractor is expected, even if not working at the same time, the client appoints the design stage coordinator together with the design appointment, and the execution stage coordinator before the works are awarded (D.Lgs. 81/2008, art. 90(3) and (4)). For private works not subject to a permesso di costruire (building permit) and worth less than 100,000 euros the first obligation does not apply, and the execution coordinator also takes on the functions of the other (para. 11). These are appointments to include in the budget from day one.

The public quadro economico is a good checklist for private clients too. The sums at the authority's disposal in Allegato I.7, art. 5 (contingencies, provisions for modifications, technical fees, acceptance testing, VAT) recall the costs private budgets most often forget.

A budget without a reference date cannot be compared with anything. Prices change between setting the budget and receiving the quotes, and again during the works. Writing "works budget of X euros, excluding VAT, at [month and year] prices" lets the figure be updated rather than found out of date.

The contingency must be visible, not hidden inside the cost items. It covers three things: estimate uncertainty, which shrinks as the design becomes more precise; unforeseen site conditions, such as the ground or the existing building; and changes to the brief the client will decide itself. Mixing them up means spending one reserve to pay for another.

The only official numerical reference comes from public works. In the quadro economico, contingencies and works carried out directly by the authority are provided for "within a threshold of between 5 and 10 per cent of the amount of the works put out to tender" (Allegato I.7, art. 5(2)), safety costs included. It is one range shared by the two items, for public works: for a private client a useful reference, not a rule. In renovations, where the existing building hides more unknowns, the contingency should be justified by identified risks and released stage by stage.

There is a second reason not to undersize it. In public works, price revision is funded, among other sources, from the contingency sums in the quadro economico, up to 50 per cent of them (D.Lgs. 36/2023, art. 60(5)). The same contingency thus serves two purposes, and a client who sizes it only for technical unknowns is exposed when prices rise.

An estimate is checked at every stage, and always on the same basis. Same quantities, price date, items and reference prezzario (price list): otherwise two successive estimates show a change of method, not how the design evolved. The branch Checking the designer's estimate sets out what to ask for and how to read it.

In the public sector, the estimate is a mandatory document. The progetto di fattibilità tecnico economica (technical and economic feasibility design) includes the "estimate of the works" and the "design cost breakdown" (Allegato I.7, art. 6(7)(i) and (l)); the detailed design includes, unless otherwise decided with reasons, the list of unit prices with their analyses, the computo metrico estimativo (priced bill of quantities) and the quadro economico (art. 22(4)).

The public design then goes through verification and validation. The contracting authority verifies the design as it develops, in an exchange between verifier and designer, with a verifier barred from the design, safety coordination, works direction or acceptance testing of the same project (D.Lgs. 36/2023, art. 42(1) and (2)). Validation is the formal act signed by the RUP that takes up the findings, and the tender notice cites its details (para. 4).

In the private sector, nothing requires an estimate at every stage. The client must require by contract, from the appointment, the level of estimate expected at each stage and its supporting documents. An independent estimate by a third-party professional on the same documents evidences a discrepancy; it replaces neither the designer nor the designer's liability.

The rules examined set no tolerance threshold for a design over budget. Nor do the sources examined show any ruling of the Corte di Cassazione (the Supreme Court) specifically on a design exceeding the spending limit, and this guide gives no percentage.

A Supreme Court decision, read as a trend, treats the designer as "bound to deliver a result". According to Cass. civ. no. 8058/2023, as reported by BibLus and by the case summaries of avvocato.it, the result owed is a "design that can actually be used"; if the building cannot be built because the design is wrong or inadequate, there is a breach and the client may refuse payment (art. 1460 of the civil code). The case concerned planning compliance, not a budget: the cautious reading is that a written spending limit in the appointment makes cost part of the expected result, while without it the argument stays fragile.

What the client can do, and what weakens its position, is covered in Design over budget: what the client can do. In short: ask for a revised design, document the discrepancy, serve formal notice and, as a last resort, take action. An oral budget and unrecorded changes to the brief weaken the client.

Before award, correction costs less than at any other moment. Diagnosis comes before cuts: does the discrepancy come from prices, quantities or the brief? The levers are then used in a precise order: brief and floor areas, level of finishes, options, phasing, procurement route, and only at the very end unit prices. In public works, the revision must stay within the economic limits of the DIP or lead to their amendment.

Award is where the budget meets the market. The branch Awarding the works without losing the budget covers its four decisions.

In the private sector, the client is free to negotiate and to retender, with one discipline: comparing on the same basis. Two preventivi (contractors' quotes) on different quantities, with missing items, undeclared exclusions or a lump sum against a remeasurable price cannot be compared. The answer is to give every contractor the same unpriced bill of quantities and list of items, then read the replies item by item. A lump sum quote on a vague design does not protect the budget: it prepares tomorrow's variations.

Choosing a general contractor or separate trade contracts directly affects spend. The general contractor includes coordination and a margin on subcontracted work; with separate contracts the price may come down, but interfaces, omissions and health and safety coordination (D.Lgs. 81/2008, art. 90) remain with the client.

In the public sector, the estimate fixed at the outset governs the procedure. The value of the contract is estimated at the moment the call for competition or the tender notice is sent (D.Lgs. 36/2023, art. 14(7)), on the total amount payable net of VAT (para. 4), and where there are lots the cumulative value of all lots counts (para. 9). A contract may not be split to avoid the code, save for objective reasons (para. 6): dividing the works to drop into a lower band is no budget solution.

The contracting authority may decline to award, but only if it has provided for this. Contracting authorities "may decide not to proceed with the award if no bid is advantageous or suitable in relation to the subject matter of the contract"; the option must be provided for in the tender notice or the letter of invitation and is exercised within 30 days of the evaluation of the bids (art. 108(10)). In practice, write it into the tender documents from the start.

Starting again means revising the estimate, the brief or the lots, not just retendering. The new amount may change the applicable procedure. The options, from not awarding to negotiation through to a new procedure, are covered in Bids above the budget: not awarding, negotiating, starting again. In the private sector the sequence is simpler: negotiate, retender, reduce the scope, keeping a record of every version.

The lowest price often costs more by the end. An unsustainable discount is recovered through variations, claims or, at worst, the contractor's insolvency and a second award. In the public sector, the contracting authority assesses "the fairness, seriousness, sustainability and feasibility" of the best bid, requests written explanations within 15 days at most, does not accept justifications relating to minimum wages or safety costs, and excludes the bid if the explanations are insufficient (art. 110, paras. 1 to 5).

One clue is in the bid, which must state "on pain of exclusion, labour costs and the company's own costs" for safety (art. 108(9)). A private client can ask for the same information and read the quote using the same grid.

On site, the budget is run from a dashboard, not invoices. Minimum lines: initial budget, amount committed, approved variations, variations under discussion, price revision, contractor claims, forecast final cost. The dashboard is updated at every SAL (stato di avanzamento lavori, the interim valuation). The branch Tracking the final cost during the works describes how to build it.

In the public sector, the pace of payments weighs on cash flow. Interim payments fall due within 30 days of each SAL being adopted, with the RUP's payment certificate within 7 days, and the advance payment of 20 per cent, up to 30 per cent if the tender documents provide for it, brings the cash outflow forward (D.Lgs. 36/2023, art. 125(1), (2) and (5)).

The civil code sorts varianti (variations) into three regimes, which the client must know before signing. This is the guide's main contribution on the private side, developed in Variations in a private building contract: agreed, necessary, ordered.

Agreed variations require written authorisation. "The contractor may not make changes to the agreed manner of the works unless the client has authorised them", and "the authorisation must be proved in writing" (art. 1659 of the civil code). If the whole price was fixed as a lump sum, the contractor, even for authorised changes, "is not entitled to payment for the changes or additions, unless otherwise agreed". This is the client's strongest protection, if it does not sign priced variation orders lightly.

Necessary variations are decided, failing agreement, by the court. Where the works require changes to be carried out in accordance with good practice and the parties cannot agree, "it is for the court to determine the changes to be made and the corresponding changes to the price" (art. 1660). If the amount of the changes exceeds one sixth of the total agreed price, the contractor may withdraw with fair compensation; if they are substantial, the client may withdraw on paying fair compensation.

Variations ordered by the client are permitted up to one sixth and must be paid for even under a lump sum. The client may make changes "provided their amount does not exceed one sixth of the total agreed price", and the contractor is entitled to payment for the additional work "even if the price of the works had been fixed as a lump sum" (art. 1661). The rule does not apply where the changes involve significant alterations to the nature of the works or to the quantities in individual categories of work.

Two practical readings by ANCE (the national builders' association) complete the picture. According to ANCE's guide on variations in private contracts (April 2024), the one sixth in art. 1661 is calculated by adding up all the variations; and the direttore dei lavori (works director) represents the client only on technical matters, so the director's decisions on prices, variations and new work do not bind the client without express delegation. So write down who authorises what, and up to what amount.

In the private sector, statutory revision applies only beyond one tenth, and only to the excess. If, through unforeseeable circumstances, the cost of materials or labour rises or falls by over one tenth of the total agreed price, either party may request revision; "the revision may be granted only for the difference exceeding one tenth" (art. 1664 of the civil code). The second paragraph grants fair compensation for unforeseen geological, water and similar difficulties that make performance considerably more onerous.

The rule can be departed from, so the price clause must be read. According to the trend of published decisions reported in the Brocardi case summaries, art. 1664 is not mandatory: the parties may depart from it or set a different threshold (Cass. no. 5267/2018; Cass. no. 4514/1980), and revision remains due even under a lump sum unless unequivocally waived (Cass. no. 1494/2011). These are trends, not rules: the wording of the contract decides.

In the public sector, a revision clause is mandatory. The initial tender documents must contain it (D.Lgs. 36/2023, art. 60(1)); for works, revision applies beyond a change of 3 per cent of the total amount and recognises 90 per cent of the excess (para. 2). What matters most for the budget is the funding: contingencies in the quadro economico up to 50 per cent, tender discounts, savings on completed works (para. 5). The effect on the contingency and the "revision" line of the dashboard are covered in Material cost increases and price revision: the effect on the budget.

The regime for modifications is detailed, but for the budget three things count: the cap, the funding and who approves. Varianti in corso d'opera (variations during the works) for unforeseeable circumstances and additional services stay within 50 per cent of the value of the initial contract for each modification, and a modification worth less than both the EU threshold and 15 per cent of the initial value of a works contract does not require a new procedure (art. 120, paras. 1 to 3). If the tender documents provide for it, the contracting authority may increase or reduce the works "up to one fifth of the contract amount" on the original terms, without the contractor being able to seek termination (para. 9).

The money comes from the quadro economico. Its sums at the authority's disposal include contingencies and the "provisions in relation to the modifications" referred to in art. 60 and 120(1)(a) (Allegato I.7, art. 5(1)(e), nos. 5 and 6). The works director proposes, the RUP assesses, the contracting authority approves; nuovi prezzi (new rates) that exceed the quadro economico are approved by the contracting authority on a proposal from the RUP (Allegato II.14, art. 5(1), (3) and (8)).

Riserve (contractor claims) are amounts the dashboard must see before they become debts. In public works the contractor records its claims in the accounts, and a new rate not challenged by a claim is deemed definitively accepted (Allegato II.14, art. 5(8)). Where the claims could change the economic value of the works by between 5 and 15 per cent of the contract amount, the RUP initiates the accordo bonario (amicable settlement procedure) (D.Lgs. 36/2023, art. 210(1), (4) and (5)). Prudently, a claim enters the forecast at its likely amount, not zero.

Withdrawal is an exit, not a saving. A private client may withdraw "even if execution of the works has begun", provided it indemnifies the contractor for expenses incurred, work done and loss of profit (art. 1671 of the civil code). The contracting authority may withdraw at any time by paying for work done, useful materials on site and one tenth of the value of the works not done, with at least 20 days' written notice (D.Lgs. 36/2023, art. 123(1) and (2)). Either way, quantify the option before using it.

This example is entirely fictitious and only shows the calculation. A private client awards the construction of a small building to a contractor for a total agreed price of 600,000 euros, excluding VAT.

Item	Calculation	Amount
Total agreed price	contract figure	600,000 euros
One sixth of the price (art. 1660 and 1661)	600,000 / 6	100,000 euros
Ordered variations already approved	45,000 + 30,000	75,000 euros
Remaining margin within one sixth	100,000 - 75,000	25,000 euros
One tenth of the price (art. 1664)	600,000 / 10	60,000 euros
Documented unforeseeable cost increase	example figure	84,000 euros
Maximum revision that can be granted	84,000 - 60,000	24,000 euros

One sixth is read cumulatively. If the client orders a third variation of 40,000 euros, the total reaches 115,000 euros and exceeds one sixth: the contractor is no longer bound to carry it out under art. 1661, and the matter becomes one for agreement.

One tenth is not a deductible to be added on. With an increase of 84,000 euros, above the one tenth of 60,000, the revision can concern only the 24,000 euros in excess; and if the contract has departed from art. 1664, not even that. The dashboard's "revision" line thus shows 24,000 euros as a risk, not 84,000, until the contract clause has been read.

The client decides; the others help, each with a different responsibility. Confusing the roles is the quickest route to a cost nobody answers for. The branch Who controls cost for the client describes who signs and who is answerable.

The designer designs within the written spending limit. It owes a usable design, per the trend already cited, and must inform in writing on foreseeable costs and its fee (D.L. 1/2012, art. 9(4)). It guarantees not market prices but the consistency of its estimate.

The works director controls execution and the accounts, not the price. In private works, on ANCE's reading, it represents the client technically and does not commit it on prices and variations without express delegation. In public works it is appointed before the award procedure starts, on a proposal from the RUP, and has the functions set out in Allegato II.14 (D.Lgs. 36/2023, art. 114(2) and (5)).

In the private sector, the project manager has no statutory status. It is a contractual role: what it can decide, up to what amount and with what duty to report to the client must be written into the appointment.

In the public sector, the RUP holds the whole cycle. The RUP is appointed in the project's first act and covers programming, design, award and execution (art. 15(1)); directs performance of the contract assisted by the works director, safety coordinator and acceptance tester (art. 114(1)); and proposes and authorises modifications as the authority's organisation provides (art. 120(8) and (13)). The RUP can rely on a support structure, with support appointments funded up to 1 per cent of the amount put out to tender (art. 15(6)).

Role	What it decides on cost	On what basis
Private client	Budget, variations, withdrawal	Appointment and building contracts; civil code, art. 1659, 1661, 1671
Designer	Consistency between design and spending limit	Written appointment; D.L. 1/2012, art. 9(4)
Works director	Execution and accounts; on price only with delegation	Appointment; in public works Allegato II.14
Project manager	Whatever the appointment assigns	The contract alone
RUP	The whole cycle of the public works	D.Lgs. 36/2023, art. 15, 114, 120
Contracting authority	Approval of variations and new rates beyond the quadro economico	Allegato II.14, art. 5(3) and (8)

The method comes down to six rules, applicable to any project in Italy, public or private. They follow the order of the five moments, from the spending limit written down before design to the forecast final cost updated on site.

1. Write the budget down before design, with a dated spending limit, the distinction between works and total cost, and an explicit contingency, in the designer's appointment or, in public works, in the economic limits of the DIP.

2. Separate the contingencies: estimate uncertainty, unforeseen site conditions, client changes and, where needed, price revision; use the public range of 5 to 10 per cent as a reference, not as a private rule.

3. Check the estimate at every stage on the same basis, and classify each discrepancy as prices, quantities or brief before deciding how to correct it.

4. Correct before awarding, starting with the brief, and write into the tender notice the option not to award when no bid is advantageous.

5. Have no variation carried out without written authorisation and a price, keeping a cumulative count of the one sixth in private contracts and of the funding in the quadro economico in public ones.

6. Update the forecast final cost at every SAL, including variations under discussion, price revision and claims at their likely amount.