Why the budget must be in the contract
The rules examined, from the codice civile (the Italian Civil Code) provisions on the building contract to D.L. 1/2012, contain no rule requiring the designer to stay within a budget. Nor do the sources examined show a professional conduct duty of this kind that can be cited with certainty. The constraint therefore arises from the contract or not at all.
A decision of the Corte di Cassazione (the Supreme Court) on the designer's performance offers support, not a rule. According to Cass. civ. no. 8058/2023, as reported by BibLus, the designer is "a debtor of a result" (unofficial translation), that is, of a design that can actually be used; if the work 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 decision concerns planning compliance, not a budget overrun. A cautious reading draws a practical pointer from it: a written spending limit helps define what result the client expects, whereas a budget stated only orally is hard to enforce.
What weakens the client is almost always the lack of a paper trail. A budget mentioned in a meeting, a brief changed several times without updating the spending limit, finishes chosen along the way: in each case it is hard to say whether the overrun comes from the design or from the client's requests.
What to obtain in writing before signing
D.L. 1/2012 gives the client a right to information that is worth using to the full. Art. 9, para. 1, abolished the fee scales of the regulated professions organised in professional orders: the fee is agreed. Art. 9, para. 4, requires the professional to disclose certain items to the client, and to do so "compulsorily, in written or digital form".
| What must be disclosed | Content under art. 9, para. 4 | Use for the budget |
|---|---|---|
| Degree of complexity of the appointment | the professional's assessment of how demanding the service is | compare it with the brief: a complex appointment signals a less certain estimate |
| Foreseeable costs | "all useful information about the foreseeable costs" from the appointment to its completion | derive from it the items of the total cost that depend on the design |
| Insurance policy | the details of the professional indemnity policy | know who answers, and within what limits, for a design error |
| Outline quote | the fee, with a quote broken down by item | fix the professional fees in the budget at signing |
The outline quote is the first certain line in the budget. Obtaining it by item, by stage and by service (design, works direction, any ancillary services) shows what is included and what is not. A service not listed is a future, unplanned cost.
The "useful information about the foreseeable costs" goes wider than the fee. The client can ask the professional to state what other costs they expect during the appointment: surveys, applications, specialist advice. It is the best moment to build, with the designer, the list of items of the total cost.
Six useful clauses for the budget
The clauses below are not imposed by law: they are contractual choices the client can propose and negotiate. Their value depends on how they are written, and it is advisable to have them reviewed by a lawyer if the project is significant.
| Clause | What to write | Effect on the budget |
|---|---|---|
| Spending limit | maximum amount of the works, net of tax, with the month of valuation and the scope (what is included and what is not) | sets the benchmark against which every estimate will be compared |
| Estimate level by stage | the type of estimate expected at each delivery: summary estimate, computo estimativo (outline cost estimate), full computo metrico estimativo (priced bill of quantities) | makes successive estimates comparable |
| Consistency check at each delivery | a duty to state in writing whether the estimate is within the spending limit and, if not, by how much it departs from it | turns the overrun into a data point, not a discovery |
| Alert threshold | written notice as soon as the estimate approaches the limit, before formal delivery | leaves time to revise the design while it is still cheap to do so |
| Redesign at no extra fee | if the estimate exceeds the spending limit for reasons not attributable to the client, the design is reworked until it fits, without new fees | protects the client from paying twice for the same design |
| Traceability of changes | every change to the brief requested by the client is recorded in writing with its effect on the spending limit | separates design overruns from those the client chose |
The redesign clause is the most effective, and the most contested. The professional will more readily agree to rework the design at no fee if the spending limit is realistic, dated and accompanied by a clear brief. That is why the clause only works together with traceability of changes: if the client has added a storey or changed the finishes, the overrun is not attributable to the designer.
Dating the spending limit avoids a pointless argument. If design takes a year and prices move in the meantime, the comparison must be made at the same month of valuation. A clause providing for the limit to be updated by an agreed index, or for estimates to be brought back to the initial date, separates the effect of prices from that of design choices.
The scope must say what sits inside the spending limit. Works only, or works and external landscaping, or fitted furniture and utility connections as well: if it is not written down, each party will read the limit in the way that suits them.
Changes to the brief: the client's share
The spending limit binds the design only if the brief stays as agreed. Each time the client asks for more floor area, a different building services system or a higher level of finish, the design budget changes. That is not a problem, as long as it is written down.
A simple rule protects both parties: no change to the brief without a written note stating its estimated effect on cost. The note can be short: what changes, what estimate results, a new spending limit or confirmation of the previous limit with the offsetting measures agreed. Signed by the client, it settles the question of who is responsible.
Larger clients and fair remuneration
For professional clients above certain thresholds, the designer's fee cannot become the variable used to balance the budget. Law 49 of 21 April 2023 (L. 49/2023) on equo compenso (fair remuneration) requires a fee proportionate to the service and consistent with the ministerial decrees (for members of professional orders, those provided for by art. 9 of D.L. 1/2012).
Art. 2 identifies the clients concerned. They are banks and insurance companies, businesses that in the previous year employed "more than fifty workers" or had "annual revenues exceeding 10 million euros", and, under para. 3, the public administration and companies with public shareholdings.
The practical effect on the budget is clear. A client that falls within these categories cannot count on reducing the professional fees to recover an overrun on the works: it must work on the design and on the brief. The text in force, reread on Normattiva, is still the one published in the Gazzetta Ufficiale (the Official Journal) in 2023.
The case of the contracting authority
In public works the spending limit does not depend on the will of the parties: it is set beforehand in the design brief, the documento di indirizzo alla progettazione (DIP). Annex I.7 to Legislative Decree 36/2023 (D.Lgs. 36/2023), art. 3, letter g), provides that the DIP must state "the economic limits to be respected and any indication of the financial cover for the work". The appointed designer therefore works within a constraint already in writing, and the verification of the design checks that it is respected.
Fees for public technical services follow their own rules, different from the free negotiation of private work. Their calculation is covered in the article on fees for engineering and architectural services in the guide to public works contracts; this page gives no amounts or fee percentages.
Who answers for what
The designer answers for the estimate they sign, not for the client's decisions. The direttore dei lavori (works director) and any project manager have different roles on cost, which are best defined in the same terms: limit, mandate, threshold beyond which the client's decision is needed. The comparison between the three roles is developed in the article on designer, works director and project manager.
This article sets out the rules as they stood on the date of checking and is intended as professional guidance. It does not replace legal advice or an examination of the specific case.