Subcontracting Agreement Spain (Contrato de Subcontrata)

A Subcontracting Agreement Spain (Contrato de Subcontrata) in the construction sector is a formal contract governed principally by Ley 32/2006, de 18 de octubre, reguladora de la subcontratación en el Sector de la Construcción (LSSC) and its development regulation, Real Decreto 1109/2007, de 24 de agosto, under which a principal contractor (contratista principal) — who has contracted directly with a property developer (promotor) or public authority to perform construction works — delegates the execution of part of those works to a specialist firm or individual (subcontratista). Article 3 LSSC defines subcontracting (subcontratación) as the practice by which a contractor or subcontractor entrusts all or part of the works contracted with them to another contractor or self-employed worker (trabajador autónomo), who commits to executing those works under the direction of whoever commissions them.

The Ley 32/2006 LSSC was enacted specifically to address the serious occupational health and safety risks arising from unregulated subcontracting chains in Spain's construction industry, which has historically had one of the highest workplace fatality rates in Europe. The statute establishes maximum subcontracting chain levels (niveles de subcontratación), mandatory registration requirements for construction companies, minimum capitalization and organisational requirements, and enhanced documentation obligations designed to confirm that all firms and workers on a construction site are properly qualified, registered, and insured.

Article 5 LSSC establishes the general subcontracting chain limits. In general construction works, a maximum of three levels of subcontracting are permitted — contractor, first-level subcontractor, and second-level subcontractor. A fourth level may only be permitted in exceptional circumstances duly justified by the principal contractor and documented in the Libro de Subcontratación (Subcontracting Book). Subcontracting below the third level by a specialist subcontractor (subcontratista especializado) is subject to particularly stringent conditions under Article 5.3 LSSC.

The Registro de Empresas Acreditadas (REA) is the central registry established under Article 6 LSSC, administered by the competent labour authority of each autonomous community (consejería de trabajo). All companies acting as contractors or subcontractors in the Spanish construction sector must be registered in the REA before commencing subcontracted works. REA registration requires the company to demonstrate: productive organisation with sufficient resources (medios propios), financial stability, technical capability, and a stable core workforce — at least 30% of the company's workforce must be permanent employees under Article 4.2 LSSC. The REA registration certificate is a mandatory document that the principal contractor must verify before awarding a subcontract.

The Libro de Subcontratación is a mandatory document under Article 8 LSSC that must be kept on every construction site by the principal contractor. It records all subcontracting relationships on the site, the identity of each subcontractor, the REA registration number, the part of the works subcontracted, the start date, and the safety coordinator's acknowledgment. The Libro de Subcontratación must be available for inspection at all times by the construction site safety coordinator (coordinador de seguridad y salud), the principal contractor, and the labour inspectorate (Inspección de Trabajo y Seguridad Social — ITSS).

Beyond the LSSC, subcontracting agreements in Spain's construction sector are also subject to: Real Decreto 1627/1997 de disposiciones mínimas de seguridad y salud en obras de construcción (minimum safety requirements); Ley 31/1995 de Prevención de Riesgos Laborales (LPRL) governing employers' occupational safety obligations; Ley 38/1999 de Ordenación de la Edificación (LOE) establishing the liability chain for construction defects; and sector collective agreements (convenios colectivos del sector de la construcción), the most important being the V Convenio General de la Construcción.

A Subcontracting Agreement Spain is required whenever a principal contractor (contratista) engaged in construction, civil engineering, or building renovation works in Spain delegates part of those works to a specialist firm or self-employed worker (trabajador autónomo), creating a legally regulated subcontracting relationship under Ley 32/2006 LSSC.

A Contrato de Subcontrata is needed when a general construction contractor (empresa constructora principal) engaging in residential building (edificación residencial), infrastructure (obra civil), or commercial construction awards a specific trade to a specialist — electrical installation, plumbing, HVAC, structural steelwork, façade works — under a written subcontract formalising obligations, price, schedule, and safety responsibilities.

The agreement is required when a public works contractor (contratista de obras públicas) under Ley 9/2017 de Contratos del Sector Público (LCSP) needs to subcontract specialised elements of publicly awarded works. Public procurement contracts impose additional subcontracting restrictions — Article 215 LCSP requires the contracting authority's prior authorisation for subcontracts exceeding certain thresholds, and the subcontractor must meet the same solvency requirements as the main contractor for the subcontracted portion.

A subcontracting contract is necessary when a construction company wishes to bring onto a site a self-employed worker (trabajador autónomo) to perform specific tasks. Article 4 LSSC imposes particular requirements for autonomous workers operating in construction — they must have the necessary professional skills and comply with the occupational safety obligations that apply to subcontractors, including possession of a valid Tarjeta Profesional de la Construcción (TPC).

The agreement is required when a developer or building owner (promotor) contracts directly with a construction company that in turn needs to engage specialist subcontractors to complete the works — the Libro de Subcontratación must record every subcontracting level from the outset, making written subcontracting agreements the documentary foundation of the entire compliance chain.

A Contrato de Subcontrata is needed when construction companies participate in joint ventures (uniones temporales de empresas — UTEs) for large projects — the UTE's internal subcontracting arrangements between UTE members must be documented, and any subcontracting to external firms requires compliance with the LSSC chain-level restrictions and REA registration verification.

Parties in Spain should prepare a Subcontracting Agreement Spain (Contrato de Subcontrata) proactively rather than waiting for a dispute to arise. Courts interpret agreements based on the written terms rather than oral representations. Under the Ley de Sociedades de Capital (LSC) RDL 1/2010, the Registro Mercantil maintains the register of Spanish companies. The Código de Comercio 1885 governs commercial obligations. The Agencia Estatal de Administración Tributaria (AEAT) administers Impuesto sobre Sociedades (IS) under Ley 27/2014. The Comisión Nacional de los Mercados y la Competencia (CNMC) enforces competition law. The Código Civil governs general contractual obligations under Article 1255. Where the transaction involves regulated activities, prior approval from the relevant authority may be required before execution.

A valid Subcontracting Agreement Spain under Ley 32/2006 LSSC must contain the following essential elements to comply with statutory obligations and protect all parties against liability arising from construction works.

Identification of Parties: Full legal name, NIF/CIF, Registro Mercantil data, and address of the principal contractor (contratista principal) and the subcontractor (subcontratista). For self-employed workers (trabajadores autónomos), their DNI/NIE and autónomo registration number (Número de Seguridad Social in the Régimen Especial de Trabajadores Autónomos — RETA) must be included. REA registration certificate numbers for both parties must be stated and verified before signing.

Description of Subcontracted Works: A precise technical description of the specific works being subcontracted — reference to the technical project (proyecto técnico) specifications, drawings (planos), and bill of quantities (mediciones y presupuesto) that define the scope. The subcontracting chain level must be stated — whether this is a first-level subcontract (from contractor to first subcontractor), second-level, or third-level — to confirm compliance with Article 5 LSSC chain limits.

Construction Site and Principal Contract Reference: The address and identification of the construction site (obra), the name of the principal contract (contrato principal) between the promotor and the contratista, the promotor's identity, and the building permit (licencia de obras) reference issued by the Ayuntamiento. The construction site safety and health plan (plan de seguridad y salud) prepared under Real Decreto 1627/1997 must be referenced, and the subcontractor's obligation to comply with it must be stated.

Price and Payment Terms: The agreed subcontract price (precio de la subcontrata) — fixed price (precio cerrado), remeasurement basis (precio unitario con medición final), or cost plus — the payment schedule tied to construction milestones or monthly progress certificates (certificaciones de obra), and the payment period. Payment periods in commercial transactions involving construction companies are governed by Ley 3/2004 de Medidas de Lucha contra la Morosidad — maximum 60 days for commercial transactions, enforceable before the Juzgados de lo Mercantil.

Occupational Safety Obligations: The subcontractor's obligation to implement a Prevention Plan (Plan de Prevención de Riesgos Laborales) under Ley 31/1995 LPRL and to coordinate with the construction site safety coordinator (coordinador de seguridad y salud) designated under Real Decreto 1627/1997. The subcontractor must confirm all their workers hold a valid Tarjeta Profesional de la Construcción (TPC) as required by the V Convenio General de la Construcción.

Warranty and Defects Liability: The subcontractor's warranty obligations for defects in their works, consistent with the warranty periods established under Ley 38/1999 LOE — one year for finishing defects (vicios o defectos de terminación), three years for habitability defects, and ten years for structural defects. The subcontractor's liability insurance (seguro de responsabilidad civil) coverage requirements must be stated.

Subcontracting Chain Documentation: The subcontractor's obligation to provide the principal contractor with all documentation required for the Libro de Subcontratación entry under Article 8 LSSC — REA certificate, identity of workers, safety documentation, and authorisation for any further sub-subcontracting below the agreed level. Any restriction on the subcontractor's right to further subcontract (sub-subcontrata) must be expressly stated.

Forms-legal.com provides this Subcontracting Agreement Spain template as a practical reference. All construction subcontracting in Spain must comply with Ley 32/2006 LSSC — failure to comply with REA registration, chain-level limits, or Libro de Subcontratación requirements constitutes a serious infraction under the Ley de Infracciones y Sanciones en el Orden Social (RDL 5/2000 LISOS) sanctioned by the Inspección de Trabajo y Seguridad Social (ITSS).

Under Ley 32/2006 LSSC, construction subcontracting in Spain is strictly regulated to protect workers and quality. The Registro de Empresas Acreditadas (REA) is managed by autonomous community labour authorities. The Inspección de Trabajo y Seguridad Social (ITSS) enforces compliance. The V Convenio General de la Construcción sets sector minimum standards. The Juzgados de lo Mercantil hear commercial disputes.

Under the Ley de Sociedades de Capital (LSC) RDL 1/2010, the Registro Mercantil maintains the register of Spanish companies. The Código de Comercio 1885 governs commercial obligations. The Agencia Estatal de Administración Tributaria (AEAT) administers Impuesto sobre Sociedades (IS) under Ley 27/2014. The Comisión Nacional de los Mercados y la Competencia (CNMC) enforces competition law. The Código Civil governs general contractual obligations under Article 1255.