An input, not a result
A budget set at the outset steers every later choice: floor areas, construction system, level of finishes, building services. If it comes later, every choice is already made and the budget can only record the total. A client, private (the committente) or public, who sets the spending limit (limite di spesa) before appointing the designer turns the estimate into a check: the design fits the budget or it does not.
In public works this sequence is written into the law. Annex I.7 to Legislative Decree 36/2023 (D.Lgs. 36/2023), art. 3, letter g), provides that the design brief, the documento di indirizzo alla progettazione (DIP), must state "the economic limits to be respected and any indication of the financial cover for the work" (unofficial translation). The stazione appaltante (the contracting authority) thus hands the designer an economic limit with the project objectives, and the design is then checked against that document too.
In private work no rule requires a budget to be set. The codice civile (the Italian Civil Code) governs the building contract (appalto) and its variations, but does not oblige the client to state a spending limit to the designer. The appointment contract must say so, in writing: without that clause, arguing later about an over-expensive design is difficult. How to write it is covered in the article on the budget in the design appointment.
Four rules for a usable budget
A budget is only useful if it can be compared with the estimate that will come later. Four rules make it so.
| Rule | What it means | Why it matters |
|---|---|---|
| Separate works and total cost | keep the works amount apart from professional fees, charges, utility connections, taxes and contingencies | the designer estimates the works; the client pays for the whole project |
| Date the budget | state the month at which prices are valued | without a date, a price rise and an estimating error look the same |
| Provide an explicit contingency | a declared line for the unforeseen, separate from the works | a contingency hidden in the prices gets used up without anyone deciding it |
| Name the location | state where the building goes and on what kind of site | cost varies with the area, access and the condition of any existing building |
The first rule is the one most often ignored. Anyone budgeting to build a house usually thinks of the contractor's price, yet the project cost also includes items arising before, during and after the works. The quadro economico (the cost framework) of a public project, governed by Annex I.7, is a good model of breakdown for private work too: its make-up is described in the article on the project cost framework.
The second rule protects the client over time. A budget set today will be compared with bids months later and with works lasting longer still. Writing "works budget at October 2026 values" lets every comparison separate the variance caused by prices from that caused by the design.
The third rule avoids both the inflated budget and the one that is too tight. A declared contingency can be decided and monitored: how much it is worth, what it is for, who may draw on it. How to size it stage by stage is the subject of a dedicated article.
The fourth rule points to market costs. Cost per square metre is not the subject of this guide, but its spread depends largely on location, building type and level of finish: the construction cost breakdown helps show which items weigh most and where an initial budget risks being underestimated.
Where the first figure comes from
The first budget comes from three sources, to be cross-checked: the client's financial capacity, reference costs in the local market and the objectives of the brief. The first sets the ceiling, the second says whether the brief fits, the third says where to cut if it does not.
The budget should not be the highest figure the client can spend. If the financial ceiling equals the works budget, any forgotten item or unforeseen event immediately exceeds what the client can afford. Better to start from the ceiling and subtract the other items of the total cost and the contingency, leaving the works amount the designer must respect.
The articles in this branch
- The article from works budget to the total cost of the project lists the items added to the works, who invoices them and when they become certain, from the safety coordinators to the development contribution.
- The article on how much to set aside for contingencies, stage by stage distinguishes estimating uncertainty, unforeseen events on site and the allowance for changes the client decides to make, with the only numerical reference in the rules, the one for public works.
- The article on writing the budget into the designer's appointment sets out the useful clauses and the information the client can require in writing before signing.
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.