Construction and Renovation Contract Spain (Contrato de Obra y Reforma)

A Construction and Renovation Contract Spain (Contrato de Obra y Reforma) is a formal written agreement between a property owner (comitente or promotor) and a building contractor (contratista) in Spain, regulating the execution of construction, refurbishment, or structural works on a property, principally governed by Articles 1588 to 1600 of the Código Civil español and by Ley 38/1999, de 5 de noviembre, de Ordenación de la Edificación (LOE). Under Article 1588 of the Código Civil, a contrato de obra is concluded when one party undertakes to produce a work or render a service in exchange for a price, making it one of the most economically significant private contracts in the Spanish legal system.

The Código Civil distinguishes two principal pricing modalities for construction contracts in Spain: the contrato de obra a tanto alzado (lump-sum contract) under Article 1593, where the contractor undertakes to complete all works for an agreed fixed price and bears the risk of cost overruns; and the contrato de obra por unidades de medida or por administración, where the price is calculated by reference to the units of work actually executed or on the basis of materials and labour costs plus a margin. Article 1593 CC establishes the principle that the architect and contractor may not demand an increase in the agreed price even if the cost of materials or labour rises, unless the property owner has authorised modifications in writing.

The Ley de Ordenación de la Edificación (LOE) establishes the legal framework for construction projects requiring building permits (licencias de obra) from the Ayuntamiento, classifying agents in the building process: the promotor (developer), the proyectista (architect who prepares the technical project), the constructor (main contractor), the director de obra (supervising architect), and the director de ejecución de obra (site supervisor). The LOE imposes mandatory decennial liability (responsabilidad decenal) under Article 17 — the constructor, architect, and other agents are jointly and severally liable for structural defects affecting the load-bearing elements of the building for 10 years after completion, for habitability defects for 3 years, and for finishing defects for 1 year.

For major construction works subject to the LOE, the promotor must take out a 10-year building defects insurance policy (seguro decenal de daños) under Article 19 LOE before construction commences — this requirement applies to residential buildings and is enforced by the Registro de la Propiedad, which will not register the newly constructed building without proof of the insurance. The Consejo Superior de los Colegios de Arquitectos de España oversees professional standards for architects, while the Consejo General de la Arquitectura Técnica de España covers arquitectos técnicos and aparejadores.

For renovation works requiring a building permit, the Ayuntamiento of the relevant municipality issues the licencia de obra mayor (for structural or significant works) or the licencia de obra menor (for non-structural improvements). Works that begin without the required licence are subject to demolition orders and administrative sanctions under Ley 7/2015 del Suelo y Rehabilitación Urbana (TRLSRU) and the autonomous community's urban planning legislation. The applicable autonomous community legislation — such as the Ley 3/2004 de Ordenación del Territorio y Protección del Paisaje in Valencia, the Ley 9/2001 del Suelo de la Comunidad de Madrid, or the Ley 2/2002 d'Urbanisme de Catalunya — supplements national law with specific permit requirements and construction regulations.

Payment under a Construction and Renovation Contract in Spain is typically structured in instalments tied to construction milestones: an initial advance payment (anticipo) upon signing, intermediate payments linked to progress certificates (certificaciones de obra) issued by the supervising architect, and a final retention payment (retención de garantía) released after the works are accepted and the defects period expires. Spanish courts — the Juzgados de Primera Instancia and, on appeal, the Audiencias Provinciales — apply Article 1124 CC (right to terminate for breach) and Article 1591 CC (contractor's ten-year liability) extensively in construction disputes.

A Construction and Renovation Contract Spain is required whenever a property owner engages a contractor to execute building, refurbishment, or renovation works on a Spanish property, regardless of whether the works require a building permit from the Ayuntamiento.

A written Contrato de Obra y Reforma is needed when a homeowner commissions structural alterations — such as removing load-bearing walls, adding a floor extension, converting a garage into habitable space, or installing a lift — that require a licencia de obra mayor from the Ayuntamiento. Without a written contract, payment disputes, defect claims, and liability apportionment under the LOE become extremely difficult to resolve before the Juzgado de Primera Instancia.

The contract is required when a community of property owners (comunidad de propietarios) governed by the Ley 49/1960 de Propiedad Horizontal commissions major refurbishment works on the common elements of a building — such as facade restoration, roof replacement, lift installation, or access ramp works — following a resolution passed at the junta de propietarios with the majority required under Article 17 LPH.

A Contrato de Obra y Reforma is needed when a commercial tenant or a business (sociedad limitada, autónomo, or other entity) commissions fit-out works on leased commercial premises — an acondicionamiento del local — to adapt the space for its intended use. The contract must address ownership of improvements at the end of the lease and must be consistent with the landlord's authorisation under the Ley de Arrendamientos Urbanos (LAU) Ley 29/1994.

The contract is required when a promotor inmobiliario (property developer) engages a construction company to build residential or commercial units for sale, under a thorough construction management arrangement where the LOE's mandatory liability regime, the seguro decenal, and the libro del edificio (building's log book) all apply.

A written construction contract is needed when works involve a subcontracting chain — under Ley 32/2006 reguladora de la Subcontratación en el Sector de la Construcción, subcontracting in construction is regulated and the main contractor's responsibilities to subcontractors (including timely payment under Ley 3/2004 de medidas de lucha contra la morosidad) must be formalised in writing.

The contract is also required when public or private funding — such as Plan de Recuperación grants, comunidad autónoma rehabilitation subsidies, or Agencia Hipotecaria mortgage drawdowns — is conditional on a formal construction contract being in place as supporting documentation for the funding body.

A valid Construction and Renovation Contract Spain under Código Civil Articles 1588–1600 and the Ley de Ordenación de la Edificación must contain the following essential elements to be enforceable and to protect both the property owner and the contractor.

Identification of Parties: Full legal name, DNI/NIF/NIE, and address of both the comitente (property owner or promotor) and the contratista (contractor). Where the contractor is a legal entity, the company's NIF, Registro Mercantil entry, and the name of the legal representative are required. The contractor's professional licences, gremio membership, and social security registration as an employer (Código de Cuenta de Cotización — CCC with the TGSS) should be stated, along with proof that workers on the project are registered with the Seguridad Social.

Description of Works: A detailed description of the scope of works (alcance de la obra), referencing the technical project (proyecto técnico) prepared by a qualified arquitecto or arquitecto técnico where required by the LOE or the Ayuntamiento. The description should identify the property by its Registro de la Propiedad reference number (referencia catastral) and address. Any technical specifications, plans, and material specifications (memoria de calidades) form part of the contract and should be appended.

Contract Price and Payment Structure: The agreed total price (precio de la obra) — either as a lump sum (precio cerrado or tanto alzado) under Article 1593 CC, or as a unit-rate or cost-plus arrangement — and the payment schedule. Instalments should be tied to measurable milestones or certificaciones de obra. The VAT applicable (IVA al tipo reducido del 10% for renovation works on residential property under Article 91.Uno.2 of Ley 37/1992 del IVA, or the general rate of 21% for new construction) must be stated. A retention amount (typically 5%–10% of the contract price) held by the comitente as a guarantee against defects for the warranty period should be specified.

Project Timeline: The agreed start date (fecha de inicio), completion date (fecha de finalización), and any intermediate milestone dates for key stages of the works. Provisions for extensions of time due to force majeure — adverse weather, material supply disruptions — and the procedure for agreeing extensions in writing should be included. Delay penalties (penalizaciones por retraso) expressed as a daily or weekly amount are enforceable under Article 1152 CC.

Building Permits and Licences: A clause allocating responsibility for obtaining the required licencia de obra from the Ayuntamiento, the comunicación previa, and any other administrative authorisations. The contract should state who bears the cost of municipal fees (tasas municipales), technical project fees (honorarios de arquitecto), and the colegial visado fee charged by the Colegio de Arquitectos.

Warranties and Defect Liability: Reference to the mandatory warranty periods under LOE Article 17 — 1 year for finishing defects, 3 years for habitability defects, and 10 years for structural defects. The contractor's obligation to remedy defects notified within the warranty period at no additional cost, and the comitente's right to withhold the retention amount until defects are rectified, should be stated.

Health and Safety: Compliance with Real Decreto 1627/1997, de 24 de octubre, which establishes minimum health and safety requirements for construction sites. The appointment of the coordinador de seguridad y salud en fase de ejecución (health and safety coordinator) for projects with more than one contractor is mandatory under Article 3 RD 1627/1997. The Plan de Seguridad y Salud must be prepared by the contractor and approved by the coordinador.

Subcontracting: A clause governing the contractor's right to subcontract parts of the works, consistent with Ley 32/2006 de Subcontratación, including the Libro de Subcontratación maintained at the work site (Article 8 Ley 32/2006) and the Registro de Empresas Acreditadas (REA) requirements for subcontractors.

Dispute Resolution: Governing law (Spanish law), jurisdiction (Juzgado de Primera Instancia of the property's location), and any agreed expert determination or arbitration mechanism for technical disputes about works quality under Ley 60/2003 de Arbitraje.

Forms-legal.com provides this Construction and Renovation Contract Spain template as a starting point for common renovation and building projects. For major works subject to the LOE or requiring a licencia de obra mayor, the contract should be reviewed by a qualified abogado specialising in derecho inmobiliario or a gestor de obra, and the technical project must be prepared and signed by a licensed arquitecto or arquitecto técnico registered with the relevant Colegio Oficial.