When does modifying a public contract after award require a new procurement procedure?

Short answer

A contracting authority must run a new procurement procedure when a change made during the term of a public contract falls outside the permitted categories in Article 72(1) and (2) of Directive 2014/24/EU. The central warning sign is a substantial modification: one that makes the contract materially different from the contract originally competed. A change is substantial if, among other things, it could have affected participation or the winning tender, shifts the economic balance in the contractor's favour, considerably extends the scope, or replaces the contractor outside a permitted route.

Not every change requires retendering. Article 72 allows changes based on sufficiently clear review clauses, strictly necessary additions by the original contractor, genuinely unforeseeable circumstances, specified forms of contractor succession, non-substantial changes, and low-value changes below both the applicable EU threshold and the directive's percentage limits. Each route has separate conditions. A price increase below 50% is not a general safe harbour.

The analysis is objective and concerns what the parties do, not merely what they call it. A settlement, extension, waiver, change order or informal course of conduct may be a modification. Authorities should classify and document a proposed change before agreeing to it, and also check the national law transposing the directive.

Start with the Article 72 structure

Commercial reasonableness is insufficient. The authority must identify an Article 72 route permitting change without renewed competition. Paragraph 5 states the residual rule:

A new procurement procedure in accordance with this Directive shall be required for other modifications of the provisions of a public contract or a framework agreement during its term than those provided for under paragraphs 1 and 2. — Directive 2014/24/EU, Article 72(5)

The first question is therefore whether the proposed change fits Article 72(1) or (2). If it does not, a new procedure is required. If the authority relies on the route for a non-substantial change under Article 72(1)(e), it must apply the substantiality test in Article 72(4).

Article 72 is available only while the contract remains in performance. In Finanzamt Österreich, C-820/24, the Court held that the term ends once the contractor has fully performed, the authority has definitively accepted the services and the final invoice has been submitted. Outstanding payment does not extend the period in which Article 72 can authorise a modification.

When is a modification substantial?

The general test is whether the modification renders the contract materially different in character from the one initially concluded. Article 72(4) then gives four circumstances in which a change is substantial in any event:

• it introduces conditions that could have admitted other candidates, led to acceptance of another tender or attracted additional participants;
• it changes the contract's economic balance in the contractor's favour in a way not provided for initially;
• it extends the contract's scope considerably; or
• it replaces the original contractor outside the permitted cases in Article 72(1)(d).

This test largely codifies the Court's judgment in pressetext Nachrichtenagentur, C-454/06. The Court explained:

An amendment to a public contract during its currency may be regarded as being material when it introduces conditions which, had they been part of the initial award procedure, would have allowed for the admission of tenderers other than those initially admitted or would have allowed for the acceptance of a tender other than the one initially accepted. — pressetext Nachrichtenagentur, C-454/06, paragraph 35

Ask whether changed price, duration, risk, specification, quantity or performance could realistically have changed participation or the winner. A scope reduction may also attract operators unable to bid originally.

The permitted routes without a new procedure

Clear review clauses or options

A well-drafted change mechanism is the strongest route. Article 72(1)(a) permits a modification, regardless of monetary value, where the initial procurement documents contain clear, precise and unequivocal review clauses or options. The provision requires more than a generic right to vary:

Such clauses shall state the scope and nature of possible modifications or options as well as the conditions under which they may be used. They shall not provide for modifications or options that would alter the overall nature of the contract or the framework agreement. — Directive 2014/24/EU, Article 72(1)(a)

The original documents should make the trigger, range and consequences foreseeable to all bidders. A broad clause allowing any change the authority considers desirable is unlikely to satisfy that standard. Even a precise clause cannot authorise an alteration of the contract's overall nature.

Necessary additional works, services or supplies

Article 72(1)(b) permits additional performance by the original contractor where it has become necessary and changing contractor cannot be done for economic or technical reasons, such as interoperability, and would cause significant inconvenience or substantial duplication of costs. The price increase must not exceed 50% of the original contract value.

Convenience is insufficient and the 50% ceiling is not an independent safe harbour. It applies to each successive change, without circumvention. Publish an Official Journal modification notice.

Unforeseeable circumstances

Article 72(1)(c) applies where circumstances a diligent contracting authority could not foresee make the modification necessary, the overall nature remains unchanged, and the price increase does not exceed 50%. A notice must again be published, and successive changes cannot be used to evade the rules.

In Obshtina Razgrad and Obshtina Balchik, joined C-441/22 and C-443/22, ordinary weather and published work prohibitions were foreseeable. Address foreseeable risks through precise review clauses.

Permitted replacement of the contractor

Changing the contractor is ordinarily substantial, but Article 72(1)(d) permits three routes: a compliant review clause; universal or partial succession following corporate restructuring, including takeover, merger, acquisition or insolvency; or, where national law provides, the authority assuming the main contractor's obligations towards subcontractors.

The successor must meet the original selection criteria, with no other substantial change or circumvention. Unchanged services do not validate a voluntary transfer to a preferred supplier.

Non-substantial and low-value changes

Article 72(1)(e) permits non-substantial changes irrespective of value, but competitive and economic effects still matter.

Article 72(2) provides a separate low-value route. The net cumulative value of successive modifications must be below both:

• the EU procurement threshold applicable under Article 4; and
• 10% of the initial value for services or supplies, or 15% for works.

The modification must not alter the contract's overall nature. The current Article 4 thresholds are periodically revised, so authorities should check the threshold in force when assessing the change. If the contract has an indexation clause, Article 72(3) makes the updated price the reference value for the percentage calculations.

“Overall nature” is a stricter concept than ordinary substantiality. In Polismyndigheten, C-282/24, a marginal-value change from fixed to variable remuneration did not necessarily alter a framework agreement's overall nature, even though it could have affected the original competition. The low-value route remained possible unless the revised method fundamentally changed the agreement's balance. Authorities must still satisfy every Article 72(2) condition.

Settlements, delay and informal conduct are not exempt

Commercial labels do not control the analysis. In Finn Frogne, C-549/14, a settlement substantially reduced an IT communications contract after performance difficulties. The Court held:

In principle, a substantial amendment of a contract after it has been awarded cannot be effected by direct agreement between the contracting authority and the successful tenderer, but must give rise to a new award procedure for the contract so amended. — Finn Frogne, C-549/14, paragraph 30

Settlement of difficult or unpredictable problems does not remove equal-treatment requirements. Test compromises, scope reductions and waivers before signing.

The joined Obshtina cases add that a modification need not be contained in a signed written amendment. A common intention to change the contract can be inferred from other written communications. A de facto extension of the performance period can be substantial where the longer period could have attracted more bidders or shifts the economic balance. Conversely, delay caused solely by a contractor's non-compliant performance is not automatically an agreed modification; the facts and the parties' conduct must be examined.

A practical decision process

Before approving a change, the authority should record:

1. the original term, price, scope, risk allocation and relevant review clauses;
2. the exact proposed change and its cumulative value with earlier changes;
3. the specific Article 72(1) or (2) route relied upon and evidence for every condition;
4. whether the change could have altered participation, tender selection, economic balance, scope or contractor identity;
5. whether it changes the overall nature of the contract;
6. the applicable current EU threshold and any national rules; and
7. whether an OJ modification notice is required under Article 72(1)(b) or (c).

Do not split one change into smaller variations. Retain evidence of necessity, alternatives, foreseeability, price and approvals. A transparency notice may affect remedies but cannot legalise a prohibited modification.

Conclusion

A post-award modification requires a new procurement unless it falls completely within one of Article 72's permitted routes. The safest analysis begins with the text of those exceptions, not with the commercial desirability of preserving the existing contract. Where no clear review clause or other exception applies, a materially different bargain must return to competition.

The assessment must look at substance and cumulative effect. Price is only one factor; duration, risk, scope, contractor identity and potential effects on the original competition can be decisive. Because Directive 2014/24 is implemented through national law, the authority must also apply the relevant national procedure, remedies and documentation rules.

Sources

• Directive 2014/24/EU, current consolidated text
• pressetext Nachrichtenagentur, C-454/06
• Finn Frogne, C-549/14
• Obshtina Razgrad and Obshtina Balchik, joined cases C-441/22 and C-443/22
• Polismyndigheten, C-282/24
• Finanzamt Österreich, C-820/24