Subcontracting

Subcontracting allows a prime contractor to delegate part of the contract scope to specialist firms while retaining overall contractual responsibility to the contracting authority. In public procurement, subcontracting is subject to transparency requirements: tenderers typically must declare intended subcontractors and the proportion of the contract to be subcontracted at bid stage. Some authorities set maximum subcontracting percentages to ensure the prime delivers core elements itself.

EU rules require disclosure of known subcontractors at tender stage and may require the authority to pay subcontractors directly in certain frameworks. Development bank guidelines (World Bank, ADB) often require subcontractor details to be included in technical proposals for complex consultancy contracts. In many countries, prompt payment legislation extends prime contractor obligations down to the subcontract tier.

For vendors, subcontracting strategies are central to bid competitiveness. Using specialist subcontractors can fill technical gaps, reduce delivery risk, and sometimes increase evaluation scores by bringing niche expertise. For SMEs, subcontracting to a prime contractor is a viable route to participate in contracts beyond their own capacity. The risks include dependency on subcontractor performance, margin dilution, and reputational exposure if a subcontractor fails. Clear subcontract agreements — mirroring key prime contract obligations — are essential.