The estimate exceeds the budget: what to do before awarding the works

The cost of a change grows as the project advances. On the design, removing a basement level means redrawing; with the contract signed, it means negotiating a variation with a contractor who already knows the price of the omission; once excavation has started, it means paying for useless work. The same choice, put off, costs more each time.

The market does not correct an estimate that is too high. Awarding the works anyway, in the hope that quotes or tenders will come in below the estimate, is a gamble. If the estimate's prices were right, the bids will come in above the budget and the revision will happen anyway, months late; if they were inflated, the problem was the estimate, and it should have been corrected beforehand. The consequences of bids over budget are covered in Bids above the budget: not awarding, negotiating, starting again.

A gap has three possible causes, and each calls for a different response. Cutting without knowing where the gap comes from leads to sacrificing quality where the problem was one of method, or to arguing over prices where the problem was the brief.

The diagnosis is made on the same basis as the budget. Same price date, same items, VAT treated in the same way: otherwise the measured gap is not the real one. If the basis is unclear, an independent cost check on the same design helps to split the gap between the three causes.

In most gaps, the three causes coexist. The aim is not to find a culprit but to assign each cause its share in euros, because the three shares must add up to the total gap. Any unexplained share points to an estimating error to be corrected before any choice is made.

The levers are used from the most effective to the least effective, that is, from the brief to prices. The order matters because the first ones decide the volume of what gets built, while the last ones work on thin margins.

1. Brief and floor areas. This is the most powerful lever: every square metre less removes structure, envelope, services and finishes all at once. The useful questions are simple: is every room needed? Are ancillary areas, such as basements, attics and porticoes, required by the function or by wishes? Do heights, overhangs and complex geometries add value in use? The factors that drive construction cost show which choices weigh most.

2. Level of finishes. Floors, wall finishes, windows and doors, sanitaryware and electrical fittings can vary widely in price for the same function. Lowering the level in some rooms and keeping it in the representative spaces is often more effective than a uniform cut. The cost of high-end finishes helps measure the gap between price bands.

3. Options. Some works can be taken out of the base design and kept as options, priced separately in the quotes: external works, pergolas, home automation, supplementary systems. The client then knows the price of each and decides after seeing the bids.

4. Phasing. Deferring part of the works to a second phase reduces the immediate amount, not the overall cost: the second phase will generally cost more, because of price movements and setting up the site again. It is a cash-flow lever more than a budget lever, to be used when the problem is available funding rather than cost.

5. Procurement route. General contractor or separate trades, lump-sum or measured quotes: the choice affects the price and the risks left with the client. The effects are covered in General contractor or separate trades: the effect on the budget.

6. Unit prices. Only at the end, and only if the diagnosis has shown prices above the market. Lowering prices in the estimate without good reason does not reduce the cost of the works: it moves the gap to the opening of the bids.

Three shortcuts bring the estimate within budget on paper, not in reality. The first is reducing the contingency, which is not a convenience margin: it covers the uncertainty of the estimate, site contingencies and the client's own changes. Using it to make the estimate fit means arriving on site without protection. How to size it is covered in How much to set aside for contingencies, stage by stage.

The second is removing from the design what will be needed anyway. A system dropped because "we will see later", a retaining structure deferred to a later survey or a finish left "at the client's choice" with no amount are announced variations, which will be paid at prices negotiated with a single contractor. The third is squeezing health and safety costs. On public works, safety costs appear in the quadro economico (economic summary) as an item not subject to discount (Annex I.7 to Legislative Decree 36/2023, art. 5(1)(b)); in the private sector, the client's safety coordination duties remain those of Legislative Decree 81/2008, art. 90. They are not an item to economise on.

In the public sector, the revision has a written reference: the economic limits in the design brief. The DIP (documento di indirizzo alla progettazione, the design brief) states "the economic limits to be respected and any indication of the financial cover for the works" (Annex I.7, art. 3(g), unofficial translation), and design verification checks that the design complies with that document (Legislative Decree 36/2023, art. 42(1)). The revision must therefore bring the design back within the limits, or lead the stazione appaltante (contracting authority) to change them explicitly, with the corresponding financial cover.

Phasing or splitting into lots cannot be used to change procedure. The code prohibits splitting a contract to avoid applying its rules, save for objective reasons (art. 14(6)), and where there are lots the cumulative value of all lots is counted (para. 9). A deferred phase is acceptable if it rests on objective reasons, not if it serves to drop into a lower value band.

A revision costs time and, often, fees. If the appointment contains a written spending limit and a clause requiring the design to be reworked at no extra fee when the estimate exceeds it, the designer revises at its own expense. If the contract is silent, the matter is negotiated, and the share of the gap caused by brief changes requested by the client weighs on the negotiation. Dealings with the designer when the design exceeds the budget are covered in Design over budget: what the client can do.

A revision without a document is lost at the first meeting. The gap, the causes, the options examined and the decision taken should be put in writing in a short note, signed by the client, which becomes the new basis of the design. The format and a fictitious example are in Preparing the budget recovery note when the estimate exceeds the budget.

After the revision, the estimate is redone. The revised design produces a new estimate, on the same basis, that confirms or contradicts the expected savings. Only that estimate authorises going out to contractors.