Registro de Empresas Acreditadas: Requirements, Documents and Registration Process for Foreign Contractors and Subcontractors
Lawants Guide · REA Registration in Spain A foreign company carrying out construction-related work in Spain—such as fit-out, assembly, installation or refurbishment—as a contractor or subcontractor may need to register with Spain’s Registro de Empresas Acreditadas (REA) and obtain an REA number. This requirement can apply even when the project is temporary and the company has no subsidiary, branch or permanent establishment in the country.
In this guide, we explain how to determine whether REA registration is compulsory for a specific project, which exemptions may apply and how a foreign contractor can obtain an REA number before starting work in Spain. We also clarify how the application must be coordinated with worker-posting, worksite, labour and tax obligations.
REA in Spain: What Foreign Contractors Need Before Site Access
The need for an REA number often becomes urgent only after the contract has been signed and the scheduled start date on the Spanish construction site is already fixed. At that stage, the client, main contractor or site manager may request proof of REA registration, while the foreign company is still trying to establish whether it also needs a Spanish tax number, a digital certificate or a local entity.
These requirements must be assessed separately. A foreign contractor may be required to register with the Registro de Empresas Acreditadas (REA) and submit a worker-posting notification without incorporating a Spanish company. Depending on the applicable regional procedure, the REA application may also be filed through an authorised representative using a valid digital certificate. A Spanish NIF is not an automatic prerequisite: whether one is needed depends on the tax and operational structure of the project.
The correct starting point is therefore not the online application form. It is an assessment of the work to be performed, the company’s role in the contracting chain, the duration and location of the project and the occupational risk-prevention arrangements already in place in its home country. Resolving these points early makes it possible to identify the correct registration route and avoid delays when site access depends on obtaining the REA number.
Does your Spanish project actually require REA registration?
Construction, fit-out, assembly and installation projects can appear similar while following different compliance routes. Lawants reviews the activity, contract, workforce, posting period and first Spanish worksite before preparing an application. The objective is to confirm the correct route and prevent an unnecessary NIF, translation or filing from delaying mobilisation.
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What Is the Registro de Empresas Acreditadas (REA)?
The Registro de Empresas Acreditadas, commonly shortened to REA, is a public administrative registry created under Spain’s rules on subcontracting in the construction sector. Its main legal framework is Law 32/2006 and Royal Decree 1109/2007.
The REA does not certify the general commercial quality of a company’s work and it is not technically a trade licence. Registration records that the company has demonstrated or declared compliance with requirements concerning productive organisation, business autonomy, occupational risk prevention and worker training.
The company must have its own material and human resources, assume the risks and responsibilities of the contracted activity and exercise genuine management over the employees working on site. It must also maintain an appropriate prevention structure and ensure that its personnel receive the required health and safety training.
What Companies Must Register for an REA Number in Spain?
REA registration is compulsory for Spanish or foreign companies that participate as contractors or subcontractors in construction works covered by Spanish law. The contractual label alone is not decisive. The authority considers the activity actually performed and the company’s position in the subcontracting chain.
- main contractors carrying out covered work on a construction site;
- subcontractors engaged for part of the construction work;
- specialist trade contractors working within a wider construction project;
- fit-out and refurbishment companies whose services form part of construction works;
- businesses assembling or dismantling prefabricated elements or temporary structures in a construction context;
- installation companies where the contracted activity falls within the statutory construction scope;
- foreign companies posting employees to Spain to perform covered work as contractor or subcontractor.
Do Foreign Companies Have to Register with the REA in Spain?
A foreign company can be required to obtain an REA number in Spain even if it has no Spanish subsidiary, branch or permanent office. The obligation follows the work and contractual role, not the existence of a local corporate structure.
This point is especially relevant to international engineering, fit-out, industrial installation, machinery assembly, scaffolding and event-structure businesses. Their activity must be classified in the context of the specific Spanish project rather than assumed to be automatically included or exempt.
Who Is Normally Excluded from REA Registration?
A self-employed person with no employees is normally outside the registration requirement. The project developer is also generally excluded when acting solely in that capacity. Particular contractual arrangements can change the analysis, so the practical role performed on site should still be checked.
Which profile is closest to your Spanish project?
Use the three profiles to identify the likely route, then collect the six facts needed for a reliable assessment.
We will act as a contractor or subcontractor, use employees and carry out work covered by the Spanish construction rules.
We will install machinery, fit out premises, erect temporary structures or perform specialist work within a wider site.
We are a self-employed person with no employees, or we act only as project developer and not as contractor.
Six facts that define your route
The self-check is a triage tool, not a substitute for project classification. A reliable conclusion requires the contract, activity, workforce and Spanish worksite to be reviewed together.
Which Activities Require REA Registration in Spain?
The construction rules cover a broad range of contracts and subcontracts performed on construction works. Activities commonly falling within the scope include:
- excavation and earthmoving;
- building, civil engineering, public works and infrastructure;
- assembly and dismantling of prefabricated elements;
- fit-out, conditioning and installation work;
- conversion, refurbishment and repair;
- dismantling and demolition;
- maintenance and conservation work;
- painting, cleaning and sanitation performed within the construction project.
For machinery suppliers, specialist installers and companies erecting temporary structures, the answer may be less obvious. Working inside a stadium, exhibition venue, factory or warehouse does not by itself make the activity construction work.
The analysis depends on how the service is integrated into the project, whether it is performed under a works contract and how the company organises and directs its employees.
How Does the Worker-Posting Notification Relate to REA Registration?
A foreign contractor sending employees to a construction site in Spain may have to complete two related but legally distinct procedures. The worker-posting notification informs the Spanish labour authority about the temporary cross-border assignment. REA registration, by contrast, demonstrates that the company meets the organisational and occupational risk-prevention requirements for participating in construction subcontracting.
The posting notification must identify the foreign employer, the workers being posted, the Spanish recipient or worksite, the services to be performed and the expected dates of the assignment. For the company’s first qualifying service in Spain, this notification is also treated as its REA application when accompanied by the declaration required under Royal Decree 1109/2007.
The company may then participate provisionally in the subcontracting process until the registration is granted or refused. Once registered, it must include its REA number in every subsequent posting notification.
In practical terms, the posting notification does not replace the REA requirement. For the first project, it is the procedure through which the foreign company applies for registration; for later projects, the notification records an REA registration that has already been obtained.
When Does the Eight-Day Exception Apply?
A foreign contractor is not required to register with the REA when the posting of its workers to Spain does not exceed eight days. For the type of cross-border posting normally used to perform a contract for a Spanish client, the worker-posting notification is also generally not required when the assignment lasts no more than eight days.
The exception concerns the duration of the posting, not the overall commercial relationship or the construction project considered in isolation.
The eight-day exception removes these specific registration and notification obligations; it does not exempt the company from every requirement applicable in Spain. Before work begins, the employer must still assess occupational risk-prevention and site-access rules, immigration and right-to-work requirements, social-security coverage and any applicable A1 certificate, as well as the project’s tax and contractual implications.
The Spanish employment conditions that remain applicable must also be determined according to the type and circumstances of the posting.
How to Apply for REA Registration in Spain
An effective REA application begins with classification of the project, not indiscriminate document collection. Once the requirement is confirmed, the company must identify the correct regional registry, prepare the relevant declarations and evidence, and coordinate the application with the worker posting process where applicable.
- Assess the work and contractual role. Confirm whether the company will act as contractor or subcontractor on construction works.
- Identify the competent authority. For a foreign posted company, this is normally the authority where its first Spanish service will take place.
- Prepare documents and project information. The file must demonstrate productive organisation, risk prevention and worker training.
- File and sign the application. A registered representative can access the REA system using the representative’s valid digital certificate.
- Follow the application through registration. Any request for correction should be addressed consistently with the original filing.
We help you obtain your REA number before work starts in Spain
Lawants manages the REA registration process for your foreign company, from identifying the competent regional authority and preparing the supporting documentation to filing the application and obtaining the REA number. We also coordinate the procedure with the worker-posting, labour and tax obligations arising from your Spanish project.
Ranked among the Best Law Firms Spain · Offices in Barcelona and Madrid
Managing Director, Lawants
Response within 24 business hours
Which Spanish Authority Handles a Foreign Company’s REA Application?
A Spanish company generally registers with the labour authority for the Autonomous Community in which its registered office is located. A foreign company posting workers to Spain follows a specific rule: it registers with the authority in whose territory its first provision of services in Spain will take place. Once granted, the registration is valid throughout the country.
Can the First Worker Posting Notification Serve as the REA Application?
Yes, for foreign companies within the applicable posting framework, the first notification submitted under Spain’s worker posting rules can have the status of an REA application when accompanied by the declaration required by Royal Decree 1109/2007. The application permits provisional participation in the subcontracting process until registration or refusal, although the site owner may impose separate access controls.
Can a Representative File the REA Application with a Digital Certificate?
The REA platform requires a valid digital certificate for transactions that involve electronic identification and signature. This does not mean that the foreign company must always obtain its own Spanish certificate before the process can begin. The official system allows a company representative to register and file on the company’s behalf using the representative’s valid certificate.
The competent Autonomous Communities do not all use an identical online route. Madrid, Catalonia and La Rioja, for example, operate through their own registration applications, so the filing channel must be confirmed before preparing the submission.
Regional channels and document expectations can change, which is why the filing route should be checked against the company’s first project rather than copied from another application.
REA Registration Requirements for Foreign Contractors
REA registration is not based only on submitting a form. The foreign company must be able to demonstrate that it is a genuine business with the organisation, resources and preventive structure needed to perform the contracted work under its own responsibility.
- Own productive organisation: the company must have and use the material and human resources needed for the contracted activity.
- Business autonomy: it must assume the risks, obligations and responsibilities inherent in carrying out the work.
- Direct management: it must organise and direct the work performed by its employees on the Spanish site.
- Prevention and training: it must maintain an appropriate occupational risk prevention system and demonstrate that site personnel have received the necessary training.
For a foreign company, these requirements are normally proved through documents issued or maintained in the home country. The task is not to reproduce a Spanish company’s paperwork mechanically, but to show that the foreign evidence satisfies the substance of the Spanish requirements.
REA Registration Documents for Foreign Companies in Spain
The file for a foreign company must allow the authority to verify the company’s productive organisation, prevention arrangements and worker training. The exact evidence depends on the home country, the competent Autonomous Community and how occupational risk prevention is organised under the law applicable to the company.
- evidence of the company’s incorporation or registration in its home jurisdiction;
- documents describing the occupational risk prevention system used by the company;
- evidence of the relevant health and safety training received by site personnel;
- documents supporting the powers of the representative, where required;
- the declarations and forms required by the competent regional authority.
For companies established in the EU or EEA, the supporting material commonly demonstrates compliance with the national rules implementing Articles 7 and 12 of Council Directive 89/391/EEC. UK and other non-EU companies need an equivalence analysis based on their own prevention arrangements and the evidence accepted by the Spanish authority.
Are Apostilles and Sworn Translations Required for REA Registration?
No universal rule requires every foreign document to be notarised, apostilled and translated by a sworn translator. The necessary form depends on the document, the authority and whether the requirement can be demonstrated through equivalent evidence. Some authorities may request translations or additional authentication, but these formalities should not be prepared automatically.
Lawants starts from the documents the company already holds and requests additions only when they are needed to make the file usable. This avoids losing time on formalities that do not solve a real requirement.
Company and Project Information Required for an REA Application
Documents and application data should be collected separately. The application normally requires detailed corporate, operational, worksite and worker information, including:
- company name, legal form, country of incorporation and foreign registration or tax identifier;
- registered address, contact details and information about the authorised representative;
- a description of the company, its productive organisation and business activity;
- material resources and equipment that will be used on the worksite;
- human resources, managers and professional roles assigned to the project;
- names, identification details, qualifications, duties and posting periods of the workers;
- the exact site address, client details, project description, timetable and any planned subcontracting;
- the method used to organise occupational risk prevention and worker training.
For new operations submitted through the REA portal from 1 June 2026, the activity must also be identified using the updated CNAE-2025 classification. Foreign business descriptions do not always map neatly onto a Spanish activity code, so this point should be checked before filing.
Further Requirements: Opening of a Centro de Trabajo and Registration of a Libro de Subcontratación
Depending on the role assumed in the project, the REA may be only one of the formalities required before work begins. Two further checks concern the formal opening of the worksite, known as the apertura del centro de trabajo, and the Libro de Subcontratación or Subcontracting Book.
Worksite opening and the Subcontracting Book compared
Opening of the Worksite
Libro de Subcontratación
The two obligations can arise on the same construction project, but they have different triggers. The company’s role and its intended subcontracting arrangements must therefore be examined separately.
When Is a Worksite Opening Required in Spain?
For construction works, the company acting as contractor must notify the competent labour authority of the opening of the worksite before work begins. The notice must be displayed visibly at the site and kept updated.
The filing may require an approved Health and Safety Plan or, for works without a formal project, the relevant risk assessment. Lawants can assist with the worksite opening and related document coordination when this separate service is required by the company’s role.
When Is a Subcontracting Book Required in Spain?
A contractor that intends to subcontract part of the works to another company or a self-employed person must obtain a Libro de Subcontratación authorised by the competent territorial authority before the subcontracted activity begins.
The book must remain on site and be updated chronologically. It is therefore not a document required from every REA-registered business. It is connected to the role of contractor and the decision to subcontract.
Do Foreign Companies Need a Spanish NIF Before REA Registration?
A Spanish NIF is not a general prior condition for registering every foreign company in the REA. The contrary assumption usually results from confusing the company’s tax identification with the electronic identification used by the person who signs and submits the application.
The REA system provides a specific form for foreign companies posting workers to Spain and allows a registered representative to file using the representative’s digital certificate. This procedural arrangement must be kept separate from the question of whether the project creates Spanish VAT, invoicing, withholding, tax return or permanent establishment obligations.
A Spanish NIF can still be necessary for tax or operational reasons. The point is that the need should be established from the project’s actual tax position, rather than imposed as an artificial preliminary step to the REA application.
Lawants Case Study: REA Registration Obtained in 24 Hours without a Prior NIF
This case shows why correct legal classification can matter more than the apparent speed of the administration. The client was not blocked by a missing document. It was blocked by a requirement that did not apply to the REA registration route.
REA Registration Obtained in 24 Hours for a British Company
Lawants separated the REA application from the Spanish NIF question and removed an incorrect prerequisite that had blocked the project for weeks.
A British company specialising in temporary steel structures and scaffolding had a fixed installation date for a major international sporting event in Madrid. It had no branch, subsidiary or permanent office in Spain.
A previous adviser had made the REA process conditional on first obtaining a Spanish NIF. The company had already lost weeks, while 10 to 12 employees still needed to be posted to Spain.
Immediate procedural diagnosis: the Spanish NIF was not a prior condition for this REA application.
Focused evidence file: no unnecessary notarial deeds, apostilles or sworn translations were added.
Parallel compliance work: REA registration and worker posting were handled as distinct but coordinated obligations.
“The decisive issue was not simply obtaining the REA quickly. It was identifying which requirements applied and which ones were unnecessarily delaying the client’s operation.”
Roberto Bosco · Managing Director, LawantsWhen REA, tax identification and worker posting are handled in the wrong order, the risk is operational. Lawants identifies the correct sequence and manages the agreed Spanish filings through one team.
Ask Lawants to review your projectThe value of the intervention was not a shortcut. It was the removal of a non-existent prerequisite, a clear definition of the engagement and a filing that matched the company’s actual position. The worksite proceeded without the client having to establish a Spanish entity.
Tax Requirements for Foreign Contractors Working in Spain
Spanish NIF
Required only when the project’s tax position or local filings make Spanish identification necessary.
VAT and Invoicing
The service, customer and connection with Spanish property determine invoicing and possible registration duties.
Permanent Establishment
Duration, continuity and operational control must be assessed under the applicable tax treaty and domestic rules.
REA registration does not determine the company’s tax position. A temporary Spanish project can generate obligations involving a Spanish NIF, VAT, invoicing, withholding or tax returns even when the foreign company has no Spanish subsidiary or branch. The tax review should run in parallel without turning the NIF into an automatic REA prerequisite.
These questions are connected, but they do not necessarily produce the same answer. Each must be assessed against the contract and the company’s actual activity in Spain.
When Does a Foreign Contractor Need a Spanish NIF?
A NIF may be needed when the transaction requires Spanish tax registration, local returns, dealings with the tax authority or another form of fiscal identification. The answer depends on the contractual chain, the customer, the invoicing flows and the nature of the operations. It should not be inferred merely from the existence of an REA obligation.
VAT and Invoicing Rules for Work Performed in Spain
The VAT treatment cannot be determined solely from the fact that work takes place on a Spanish site. The service must be classified, its relationship with real estate examined, the customer identified and the person liable for the tax established. Depending on the facts, the place of supply, invoice wording, reverse charge treatment and registration obligations may differ.
Permanent Establishment Risk for Foreign Construction and Assembly Projects
Tax treaties often contain a duration threshold for construction and assembly projects, but the applicable threshold and conditions depend on the foreign company’s country of residence. A short project should not be treated as automatically tax-free. Other forms of fixed presence, authority exercised in Spain, connected contracts and the actual organisation of the work can create obligations independently of the REA.
Project duration should be calculated using the actual activity, relevant preparatory phases and any connection between contracts. Before work starts, the company should answer three separate questions: is REA registration required, is a Spanish NIF required, and does the activity create a permanent establishment?
Where to Find and Verify an REA Number in Spain
The REA number is an individual registration key assigned to the company and valid throughout Spain. The status of an accredited company can be checked through the public Registro de Empresas Acreditadas portal.
The registry allows users to search for an accredited company and confirm its registration. A client or main contractor may also request a current registration certificate before the works begin. A number from an old document should not be accepted without checking that the registration remains active.
How Long Is REA Registration Valid in Spain?
REA registration remains valid for three years and can be renewed for further periods of the same duration. Renewal must be requested within the six months before expiry. If no valid renewal is filed in time, the registration is automatically cancelled.
The company must also report relevant changes to its registered information and request cancellation if it no longer meets the conditions for registration. An REA number is not a permanent licence that can be left unattended after the project ends.
How Much Does REA Registration Cost in Spain?
There is no meaningful single cost for every foreign REA application because the work required depends on the company and the project. The main variables are the competent Autonomous Community, the condition of the existing documents, the need to establish equivalence with foreign health and safety evidence, representation, translations that are genuinely required and whether the authority requests corrections.
The scope also changes when the company needs more than the registration itself. Worker posting notifications, worksite opening, a Subcontracting Book, Spanish tax identification or VAT analysis are separate workstreams.
A useful proposal should therefore define what is included, which documents the client must provide and which additional obligations remain outside the REA filing, rather than quoting a headline amount without examining the project.
Common REA Registration Mistakes that Delay Site Access
Delays are not always caused by Spanish bureaucracy. Applications are frequently blocked because they were built on an incorrect assumption or because the documents describe the activity, prevention system and worker posting inconsistently.
- obtaining a Spanish NIF before checking whether the project actually requires it;
- filing with an Autonomous Community that is not competent for the first service;
- confusing the representative’s digital signature with the company’s tax identification;
- classifying an installation without reviewing the contract and construction context;
- preparing apostilles or sworn translations that have not been requested;
- failing to coordinate the first REA application with the posting notification;
- overlooking worksite opening or the Subcontracting Book when acting as contractor;
- assuming that REA and posting compliance also resolve tax and social security matters.
Lawants REA Registration Services for Foreign Contractors
Lawants assists foreign companies performing construction, fit-out, installation, assembly and other temporary contracts in Spain. The engagement starts with a project diagnosis, because the objective is to identify the necessary obligations and complete them in the correct order.
Roberto Bosco directly supervises the initial assessment and coordinates the professionals involved. Where technical HSE work or another specialist activity falls outside the legal engagement, the scope is defined clearly so that the REA registration is not mistaken for broader site safety management.
The start date is fixed. Spanish compliance should follow the project schedule, not stop it.
Lawants determines which requirements apply, prepares the REA file, coordinates worker posting and identifies the additional tax or worksite obligations that can affect mobilisation. The same team remains responsible for the agreed Spanish work until the relevant procedures are completed.
Legal Framework for REA Registration in Spain
The REA operates within a broader set of Spanish construction, occupational safety and worker posting rules. The principal legal sources relevant to a foreign contractor are:
- Law 32/2006, regulating subcontracting in the construction sector;
- Royal Decree 1109/2007, implementing the REA and Subcontracting Book rules;
- Royal Decree 1627/1997, establishing minimum health and safety provisions for construction works;
- Law 45/1999, governing workers posted to Spain in cross-border service provision;
- Council Directive 89/391/EEC, concerning measures to improve worker safety and health.
These rules interact differently according to the company’s home jurisdiction, employment model, contractual position and worksite role. Reading the REA provisions alone is therefore insufficient for a complete cross-border mobilisation plan.
The original Lawants explainer video below provides additional context on the registration process. The written guide remains the reference for the updated procedural and strategic analysis.
Frequently Asked Questions about REA Registration in Spain
These answers address the questions most frequently raised by foreign contractors before entering a Spanish construction site.
What Is the REA in Spain?
It is the Registro de Empresas Acreditadas, a public registry for companies participating as contractors or subcontractors in construction works. It records compliance with organisational, training and occupational risk prevention requirements.
Is the REA a Licence or a Certification?
The phrases “REA licence” and “REA certification” are commonly used in English, but the REA is technically a public registration and accreditation system, not a general construction trade licence.
Must Every Foreign Contractor Register with the REA?
No. The answer depends on the activity, the role as contractor or subcontractor, the presence of employees and the posting period. Foreign postings that do not exceed eight days benefit from a specific REA registration exception.
Does a Foreign Company Need a Spanish NIF First?
Not as a universal prior condition for REA registration. A NIF may still be required for separate tax or operational reasons, which must be assessed from the project.
Can a Representative File the REA Application?
Yes. The official REA application allows a registered company representative to act on the company’s behalf using the representative’s valid digital certificate.
How Long Is an REA Number Valid?
Registration is valid for three years. Renewal must be requested during the six months before expiry, otherwise the registration is automatically cancelled.
Does a Regional REA Number Apply throughout Spain?
Yes. A foreign company applies through the authority for its first Spanish service, but the resulting registration has national validity.
Does REA Registration Replace the Worker Posting Notification?
No. The first posting notification can operate as the REA application in the circumstances provided by law, but posting and registration remain distinct obligations.
How Quickly Can an REA Registration Be Obtained?
Timing depends on the competent authority, the quality of the file and whether corrections are requested. In the case described in this article, Lawants obtained the registration within 24 hours of filing, but each project must be assessed individually.
