Modification

A modification is a change to a public contract or framework agreement during its performance period. Article 72 of Directive 2014/24/EU strictly regulates the circumstances under which contracts may be modified without conducting a new procurement procedure, because unrestricted modification would undermine the competitive principles at the heart of EU procurement law. Understanding modification rules is essential for both contracting authorities and economic operators, as incorrectly applied modifications can render a contract void and expose parties to legal challenges and financial penalties.

How It Works

Once a public contract has been awarded through a competitive procurement procedure, the terms of that contract are, in principle, fixed. The winning tenderer was selected based on the specific requirements, scope, and conditions published in the contract notice and procurement documents. If the contracting authority could freely change those terms after award, it would undermine the fairness of the original competition — other tenderers might have bid differently, or additional tenderers might have participated, had they known the final terms.

However, practical reality demands some flexibility. Contracts are often long-term (multi-year services, infrastructure projects), and circumstances change. Article 72 provides a carefully balanced framework allowing necessary modifications while protecting competitive integrity.

Modifications fall into several categories under Article 72:

1. Review clauses (Article 72(1)(a)). The most straightforward basis for modification. If the original procurement documents contained clear, precise, and unequivocal review clauses (sometimes called "variation clauses" or "price adjustment clauses"), changes made in accordance with those clauses are not considered substantial modifications. For example, a contract might include an annual price indexation clause linked to a published cost index, or a clause allowing scope adjustments within defined parameters. The key requirements are that the clauses must state the scope and nature of possible modifications, the conditions under which they may be used, and must not alter the overall nature of the contract.

2. Additional works, services, or supplies (Article 72(1)(b)). Modifications for additional work that was not included in the initial procurement become necessary when a change of contractor cannot be made for economic or technical reasons (such as interchangeability or interoperability requirements), and changing contractor would cause significant inconvenience or substantial duplication of costs. Each modification under this provision is limited to 50% of the value of the original contract, and successive modifications cannot be used to circumvent the directive.

3. Unforeseeable circumstances (Article 72(1)(c)). When circumstances that a diligent contracting authority could not have foreseen arise, the contract may be modified. Examples include regulatory changes that require modifications to an existing service contract, unexpected geological conditions in a construction project, or pandemic-related disruptions. As with additional works, each modification is capped at 50% of the original contract value and must not alter the overall nature of the contract.

4. Contractor replacement (Article 72(1)(d)). A new contractor may replace the original contractor through corporate succession (mergers, acquisitions), insolvency proceedings, or assignment of the contract where the original procurement documents permitted such assignment. The replacement contractor must meet the original selection criteria and must not be subject to exclusion grounds.

5. Non-substantial modifications (Article 72(1)(e) and 72(2)). Modifications that are not "substantial" within the meaning of Article 72(4) are permitted. Additionally, Article 72(2) provides a safe harbor: modifications below both the EU threshold AND 10% of the original contract value for services and supplies (or 15% for works) are always permitted without a new procurement.

Publication requirement. Under Article 72(1) subparagraphs (b) and (c), the contracting authority must publish a modification notice in the Official Journal (TED). In the eForms standard, this is published as a contract award notice with the subtype "can-modif."

Legal Framework

Article 72 of Directive 2014/24/EU is the core provision governing contract modification. It provides an exhaustive list of circumstances under which modifications are permitted without a new procurement procedure.

Article 72(4) defines what constitutes a "substantial" modification. A modification is substantial, and therefore requires a new procurement, if it:

Renders the contract or framework agreement materially different in character from the one initially concluded
Introduces conditions which, had they been part of the initial procedure, would have allowed different tenderers to participate or a different tender to be accepted
Changes the economic balance of the contract in favor of the contractor in a manner not provided for in the original terms
Extends the scope of the contract considerably
Replaces the contractor outside the permitted circumstances of Article 72(1)(d)

The CJEU has developed significant case law interpreting these provisions. In Case C-454/06 (Pressetext), decided under the previous directives, the Court established the foundational principle that a material amendment to the terms of a public contract during its currency constitutes a new award requiring a new procedure. This case remains highly influential in interpreting the codified rules in Article 72.

Case C-549/14 (Finn Frogne) clarified that a settlement agreement that substantially modifies a contract's terms constitutes a new award. Case C-296/15 (Medisanus) addressed modifications to framework agreements, holding that modifications that substantially change the terms available to the original participants require a new procedure.

Article 73 provides the related concept of termination rights, requiring Member States to ensure that contracting authorities have the right to terminate a contract where a substantial modification should have triggered a new procedure, where the contractor should have been excluded, or where the CJEU finds a serious infringement of the Treaties or the directive.

Member State transpositions provide additional detail. In Germany, Section 132 of the GWB implements Article 72 with specific procedural requirements for documenting modification decisions. In France, the Code de la commande publique (Articles L2194-1 to L2194-3 and R2194-1 to R2194-9) provides detailed rules on avenants (formal contract amendments). In the Netherlands, modification rules are particularly scrutinized by the Commission for Public Procurement Disputes (Commissie van Aanbestedingsexperts).

Practical Examples

Example 1: Price Indexation. A five-year facilities management contract includes a review clause allowing annual price adjustments based on the national consumer price index. After year two, inflation rises significantly, and the contractor invokes the clause to increase prices by 8.5%. This modification is valid under Article 72(1)(a) because it follows a clear, precise review clause that was part of the original procurement documents and was known to all tenderers.

Example 2: Unforeseen Ground Conditions. During a road construction project, the contractor encounters unexpected contaminated soil that was not identified in the pre-construction site investigations. The contracting authority modifies the contract to include soil remediation works worth EUR 800,000, representing 12% of the original EUR 6.5 million contract value. This modification is valid under Article 72(1)(c) (unforeseeable circumstances), as the contamination could not have been detected through reasonable due diligence, and the modification is below the 50% cap.

Example 3: Scope Expansion Requiring New Procurement. A government IT contract for a document management system is expanded to include a customer relationship management (CRM) module, increasing the contract value by 60%. This modification is likely "substantial" under Article 72(4) because it considerably extends the scope and could have attracted different tenderers (CRM specialists who did not bid for the original document management contract). A new procurement procedure is required.

Key Considerations for Suppliers

Include review clauses in your bids. When responding to tenders for long-term contracts, consider whether the procurement documents include adequate review clauses. If they do not, you may wish to raise this during the question-and-answer period. Contracts without review clauses provide no mechanism for legitimate price adjustments when costs increase, potentially creating financial pressure that compromises service quality.

Document the basis for modifications carefully. If you are the incumbent contractor requesting a modification, provide detailed documentation supporting the legal basis. For unforeseen circumstances (Article 72(1)(c)), demonstrate what was unforeseeable and why. For additional works (Article 72(1)(b)), explain why changing contractor is technically or economically impossible. Well-documented modification requests are more likely to be approved and less likely to be challenged.

Understand the 50% cap on cumulative modifications. Each modification under Article 72(1)(b) or (c) is capped at 50% of the original contract value. However, successive modifications are each individually capped at 50%, not cumulatively (though their cumulative effect must not alter the overall nature of the contract). The contracting authority must publish the value of each modification, so cumulative modifications are visible and subject to scrutiny.

Monitor contract modifications by your competitors. Published modification notices on TED provide intelligence about your competitors' contracts. A substantial modification to a competitor's contract may indicate that the contracting authority is dissatisfied with the original scope, that circumstances have changed, or that a new procurement may be imminent when the modification limit is reached.

Be prepared for termination provisions. Article 73 requires Member States to provide termination rights where a substantial modification has occurred without a new procedure. If you are an incumbent contractor, a wrongly implemented modification can lead to contract termination. If you are a competing supplier, a wrongly implemented modification may give you grounds to challenge the contract and force a new procurement.

Change Notice — The notice published to announce changes to an existing procurement, which may include contract modifications.
Contract Award Notice — The notice type used to publish contract modifications (subtype "can-modif").
Public Contract — The contract that is the subject of the modification.
Framework Agreement — Modifications to framework agreements follow similar rules with additional complexity.
Procedure — The procurement process that may be required if a modification is deemed substantial.
EU Threshold — Relevant to the de minimis modification rule under Article 72(2).

Frequently Asked Questions

What happens if a contract is modified without legal basis?

If a contracting authority modifies a contract in a manner that constitutes a substantial modification without conducting a new procurement, affected economic operators can challenge the modification through the national remedies system. Under the Remedies Directive (2007/66/EC), the consequences can include: declaration that the modification (or the modified contract) is ineffective; imposition of alternative penalties (shortening the contract term, financial penalties); and damages to the aggrieved tenderer. The contracting authority may also face audit findings and reputational damage. In practice, wrongly implemented modifications are one of the most common sources of procurement litigation across EU Member States.

Can a contract be modified to change the contractor?

Only in limited circumstances defined by Article 72(1)(d): through universal or partial corporate succession (where the original contractor is absorbed through merger, acquisition, or insolvency and the successor meets the original selection criteria), or where the original procurement documents included an assignment clause permitting the transfer. A direct replacement of one contractor with a different, unrelated company requires a new procurement procedure. The new contractor must demonstrate that it meets all the original selection criteria and is not subject to exclusion grounds.

Is there a limit to the number of modifications that can be made to a single contract?

There is no fixed maximum number of modifications. Each modification must independently satisfy one of the legal bases in Article 72. However, the cumulative effect of multiple modifications must not alter the overall nature of the contract, and each modification under Article 72(1)(b) or (c) is individually capped at 50% of the original contract value. In practice, a pattern of repeated modifications may indicate that the original procurement was inadequately scoped, potentially attracting audit scrutiny and legal challenges. If the cumulative modifications fundamentally change the nature or scope of the contract, the entire arrangement may be challenged as a de facto new award without competition.

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