Subcontracting

Subcontracting is the practice by which a main contractor engages one or more third-party entities to perform specific portions of a public contract. In EU public procurement, subcontracting is a well-established mechanism that allows economic operators to draw on specialised capabilities, expand capacity, and manage risk. It also serves as a critical pathway for SMEs to participate in large-scale government contracts that they could not pursue independently as prime contractors.

How It Works

When an economic operator submits a tender for a public contract, it may plan to subcontract certain tasks to other firms. EU procurement law requires transparency in this process. The tenderer must indicate in its offer which parts of the contract it intends to subcontract and, where known at that stage, the identity of the proposed subcontractors.

The subcontracting declaration serves several purposes. It allows the contracting authority to assess whether the proposed delivery model is credible and whether the tenderer will retain sufficient control over contract performance. It also enables verification that proposed subcontractors are not subject to exclusion grounds -- a critical governance safeguard.

Once the contract is awarded and performance begins, the main contractor must notify the contracting authority of any subcontractors not previously identified, as well as any changes to the subcontracting arrangements. For works contracts and services to be provided at the facility under direct oversight of the contracting authority, this notification obligation extends to the entire supply chain, not just first-tier subcontractors.

The main contractor always retains full legal and contractual responsibility for the performance of the entire contract, regardless of how much work is subcontracted. If a subcontractor fails to deliver, the contracting authority holds the main contractor accountable. This principle of undivided responsibility is fundamental to the public procurement model.

Contracting authorities may set certain conditions on subcontracting. They may require that particular critical tasks -- such as design work or key technical elements -- be performed by the tenderer itself rather than subcontracted. They may also limit the proportion of the contract that can be subcontracted, although such limits must be justified and proportionate.

In some Member States and under specific contract types, contracting authorities can arrange direct payment to subcontractors rather than routing all payments through the main contractor. This protects subcontractors -- frequently SMEs -- from delayed payments or insolvency of the prime contractor.

A distinct but related concept is "reliance on the capacities of other entities" under Article 63 of Directive 2014/24/EU. This allows a tenderer to demonstrate compliance with selection criteria by relying on the technical or financial resources of another entity, provided that entity will actually be involved in contract performance. While this mechanism overlaps with subcontracting, it serves a different legal purpose: meeting qualification requirements rather than describing delivery arrangements.

Legal Framework

Article 71 of Directive 2014/24/EU is the primary provision governing subcontracting in classical public procurement. It establishes the following key obligations and rights:

Tenderer obligations: At the tender stage, the economic operator must indicate the share of the contract it intends to subcontract and any proposed subcontractors. During contract performance, the contractor must inform the contracting authority of new or changed subcontractors and provide their names, contact details, and legal representatives.

Contracting authority rights: The authority may verify that subcontractors are not subject to mandatory exclusion grounds (Article 57). If a subcontractor is found to have exclusion grounds, the authority can require its replacement. The authority may also request information about subcontractors directly involved in the performance of works or services at the site under its oversight.

Direct payment: Member States may provide mechanisms for direct payment from the contracting authority to subcontractors. Article 71(3) explicitly authorises this, giving Member States discretion over implementation. In France, the Code de la commande publique includes robust provisions for direct payment (paiement direct) when the subcontracted amount exceeds a defined threshold.

Cascading transparency: For works contracts and services performed under direct authority oversight, contracting authorities may extend subcontractor verification requirements beyond first-tier subcontractors to the entire chain.

Article 63 (reliance on third-party capacities) complements Article 71 by allowing tenderers to use another entity's resources to meet selection criteria. The entity providing capacity becomes jointly liable with the tenderer for the relevant criteria.

In Germany, Sections 36 and 36a of the VgV (Vergabeverordnung) transpose the subcontracting provisions. German procurement law additionally requires that subcontractors in public works comply with the applicable minimum wage and working conditions legislation (Tariftreue- und Vergabegesetze of the respective Laender).

Under the Utilities Directive (2014/25/EU), Article 88 contains equivalent subcontracting provisions adapted to the energy, transport, water, and postal sectors.

Practical Examples

A large engineering firm wins a contract to build a wastewater treatment plant for a municipal authority. The firm subcontracts the electrical installation work to a specialist electrical contractor, the membrane filtration equipment supply and installation to a technology provider, and the landscaping and site restoration to a local construction company. Each subcontractor is named in the tender and verified against exclusion grounds.

In an IT procurement scenario, a systems integrator wins a contract to modernise a government department's digital infrastructure. It subcontracts cybersecurity audit services to a certified penetration testing firm, cloud migration to a cloud-native specialist, and user training to an educational services provider. The government department may require that the core architecture design and project management remain with the prime contractor.

A facilities management company awarded a building maintenance framework agreement subcontracts window cleaning, elevator servicing, and fire safety inspections to specialist SMEs in each region covered by the framework. The contracting authority has arranged direct payment to subcontractors to protect the smaller firms from cash-flow risk.

Key Considerations for Suppliers

Suppliers planning to subcontract should clearly identify subcontracted tasks and subcontractor identities in their tenders. Vague or incomplete subcontracting declarations can raise red flags during evaluation and may lead to requests for clarification or, in the worst case, exclusion.

Before nominating a subcontractor, the main contractor should conduct due diligence to verify that the subcontractor is not subject to exclusion grounds. If a proposed subcontractor is later found to have tax debts, criminal convictions relevant to Article 57, or other disqualifying issues, the contracting authority will require a replacement -- potentially disrupting the project timeline.

Main contractors should formalise subcontracting arrangements through clear written agreements that define scope, deliverables, timelines, quality standards, and payment terms. The main contractor's contractual liability to the contracting authority is not diminished by subcontracting, so robust back-to-back contracts are essential to manage risk.

For SMEs operating as subcontractors, understanding payment terms is critical. In jurisdictions with direct payment provisions, SMEs should confirm with the contracting authority whether direct payment applies and the procedures for invoicing. Where direct payment is not available, SMEs should negotiate clear payment milestones and consider obtaining written acknowledgement from the contracting authority that they are a recognised subcontractor.

Suppliers should also be aware of sector-specific subcontracting restrictions. Defence and security procurement under Directive 2009/81/EC imposes stricter subcontracting rules, including requirements for competitive subcontracting and limits on the proportion that can be subcontracted.

Subcontracting is closely connected to the public contract being performed and to the economic operators involved, both as main contractors and as subcontractors. The award decision may consider the tenderer's subcontracting plan as part of evaluating delivery credibility. Selection criteria interact with subcontracting through the capacity-reliance mechanism of Article 63. SMEs benefit from subcontracting as a path to public contract participation. Exclusion grounds must be verified for subcontractors just as for main contractors.

Frequently Asked Questions

Can a contracting authority ban subcontracting entirely?

No. A blanket prohibition on subcontracting would be disproportionate and contrary to the principles of Directive 2014/24/EU, which explicitly recognises and regulates subcontracting. Contracting authorities may, however, require that certain essential or critical tasks be performed by the tenderer directly, and they may set reasonable percentage limits on the share of the contract that can be subcontracted.

Is there a maximum percentage of a contract that can be subcontracted?

EU directives do not set a fixed maximum percentage. Some national laws or specific procurement documents may limit the subcontracting share -- for example, requiring that the main contractor perform at least 30 percent of the contract value. Any such limit must be proportionate and stated in the procurement documents from the outset.

What happens if a subcontractor is found to have exclusion grounds after contract award?

The contracting authority has the right to require the main contractor to replace the affected subcontractor with one that meets all requirements. Article 71(6)(b) of Directive 2014/24/EU explicitly provides for this. The main contractor must propose a replacement, and the contracting authority verifies the new subcontractor before it can begin work.