Changing a public contract after signature

After the award · This guide was generated with the help of an AI system. Its legal references were checked against the official EU texts listed under Sources on 10 October 2026. Next review due by 10 October 2027, or sooner if the law changes. EU rules only. Not legal advice.

Short answer. A contract or framework agreement can be changed without a new tender only along the routes Article 72 of Directive 2014/24 lists:

• a clear review clause or option in the original documents;
• necessary additional work from the same contractor;
• unforeseeable circumstances;
• a permitted change of contractor;
• a small change below both the EU threshold and 10% (supplies and services) or 15% (works);
• any other change that isn’t “substantial”.

Anything else needs a new procedure (Article 72(5)). For a contractor, an agreed change outside these routes is a risk: in some Member States the contractor can be fined too (C‑263/19). For a rival, it can amount to a contract the market never got to bid for.

EU law · The routes, in the order to check them

Successive modifications under routes 2 and 3 “shall not be aimed at circumventing this Directive”. Where the contract has an indexation clause, the updated price is the reference value for the caps (Article 72(3)).

When a change is substantial

A change is substantial, unless one of routes 1 to 5 covers it, if any of these applies (Article 72(4)):

• (a) it introduces conditions that, in the original procedure, would have let other candidates in, made another tender win, or attracted more participants;
• (b) it shifts the economic balance in the contractor’s favour in a way the contract didn’t provide for;
• (c) it extends the scope “considerably”;
• (d) it replaces the contractor other than under route 4.

Ending the contract

Member States must let buyers terminate a contract that was substantially modified when a new procedure was required, under conditions set by national law (Article 73(a)).

EU law · What the Court has said

A change can happen without a signed amendment. In C‑441/22, a Bulgarian municipality’s contract for a school sports hall said the works couldn’t run beyond 30 November 2019. The parties moved the date to 30 January 2020 by a supplementary agreement. The works were certified complete on 24 February 2020, with no justification for that last delay (paragraphs 14–20). The Court held that a substantial modification doesn’t require a signed written agreement. The parties’ common intention can be inferred from other written material, among other things (ruling point 1).

“Unforeseeable” means unforeseeable to a diligent buyer. In the same judgment, the Court said a buyer relying on route 3 must have taken into account, when preparing the contract, foreseeable causes of delay such as “ordinary weather conditions” and statutory bans on works published in advance. If the documents didn’t provide for them, they can’t justify performance beyond the time limit set in the documents and the contract (ruling point 2).

Partial succession after insolvency. In Advania (C‑461/20), an IT supplier holding four framework agreements with a Swedish agency went insolvent. Its administrator transferred only the framework agreements to a competitor, not the business. The Court held that the competitor had succeeded in part to the original contractor following restructuring, under route 4 (ruling). The other conditions of route 4 still apply.

Changing how you’re paid, small change. In Polismyndigheten (C‑282/24), the Swedish police changed the payment model in two towing frameworks awarded on lowest price. The fixed-price radius went from 10 to 50 kilometres and the prices were adjusted, without the total value changing more than marginally. Below the Article 72(2) values, such a change doesn’t alter the “overall nature” of a framework unless it changes the agreement’s balance fundamentally (ruling).

Frameworks that hit their maximum. Once a framework’s maximum quantity or value is reached, the buyer can’t use it for a new contract unless that contract isn’t a substantial modification under route 6 (C‑274/21, ruling point 2; see framework agreements).

The contractor can be fined too (utilities). In T‑Systems Magyarország (C‑263/19), the Court held that the EU rules don’t preclude national law from attributing the infringement to, and fining, the successful tenderer as well as the buyer, in a review started by a supervisory authority on its own initiative. Each fine must reflect that party’s own conduct (ruling points 1 and 2). The case concerned the utilities rules. The ruling permits such fines. It doesn’t require them.

Our analysis · A worked example of the small-change route

A regional authority (a sub-central buyer) has a services contract with an initial value of €1,000,000. The 2026–2027 threshold for its services is €216,000 (see EU procurement thresholds).

• 10% of the initial value is €100,000. That’s lower than the threshold, so €100,000 is the binding limit.
• A €90,000 change is under both values. It can be made without checking the substantiality tests, if the overall nature stays the same.
• A second change of €20,000 brings the net cumulative value to €110,000, which is over €100,000. The small-change route no longer covers it. One of the other routes would have to apply.
• With an indexation clause that has raised the price to €1,050,000, the reference value is the updated price, so 10% becomes €105,000 (Article 72(3)).
• On a €3,000,000 contract, 10% is €300,000. The threshold of €216,000 is then the binding limit.

This calculation follows the wording of Article 72(2) and (3). How “the value of the modification” is measured in a particular case can raise questions the Directive doesn’t answer, such as a change that adds some costs and removes others.

Practice · If you’re the contractor

1. Read the review clauses before you bid. Route 1 only covers changes the documents provide for clearly. If you expect to need price revision or options, raise it in a clarification question before the deadline.
2. Put foreseeable risks in your timetable. Ordinary weather and published works bans won’t justify a late finish under route 3 (C‑441/22).
3. Treat informal changes as changes. Emails and site records can show an agreed modification (C‑441/22).
4. Restructuring or insolvency. A successor can take over the contract under route 4, but it must meet the original selection criteria (see selection criteria).
5. Ask which route applies before agreeing to a significant change. In some Member States the contractor can be fined as well as the buyer (C‑263/19).

Practice · If a rival’s contract was changed

1. Look for modification notices. Changes under routes 2 and 3 must be published in the Official Journal (Article 72(1)). Their content is set out in Annex V part G.
2. Compare with the original award. Test the change against the four signs of a substantial modification. Would you have bid if the documents had said that?
3. Check frameworks against their maximum (C‑274/21).
4. Talk to a lawyer about remedies. Directive 89/665 doesn’t mention modifications expressly. Whether and how you can challenge one, and in what time, depends on national law (see challenging an award decision).

What this page doesn’t cover

• National contract law on variations and claims.
• Modifications of utilities contracts (Article 89 of Directive 2014/25), except as noted, and of concessions (Article 43 of Directive 2014/23).
• Case law under the earlier Directives, before Article 72 codified the rules.
• Termination in detail (Article 73).
• The modification rules in the Commission’s 2026 proposal, including a 15% threshold, which aren’t law (see what the proposed Public Procurement Act would change).