What it is
Rules for subcontracting on construction sites in Spain
It is a members’ bill. Introduced by parliamentary groups, the Senate, regional governments or citizens. It was introduced on 5 April 2004. Introduced by: Grupo Parlamentario de Izquierda Verde-Izquierda Unida-Iniciativa per Catalunya Verds.
Official title: Private member's bill regulating subcontracting in the construction sector.
Source: Congreso de los Diputados, file 122/000047· updated 11 Nov
Automatic summary, not yet reviewed
- The law regulates subcontracting in construction to improve working conditions and, in particular, the safety and health of workers.
- Subcontracting can only go down to the third level: the third subcontractor may not subcontract anyone else, and neither may a self-employed worker. In justified cases (specialization needs, technical complications or force majeure), the site's technical management may approve one extra level, and must record it in the Subcontracting Book.
- To act as a contractor or subcontractor, a company must have its own organization and resources, staff trained in occupational risk prevention, and must register in the Registry of Accredited Companies. It must also keep a minimum share of permanent workers, which rises from 10% to 30% over three years.
- Every site must keep a Subcontracting Book recording all subcontracting arrangements, their level and other details. The developer, the technical management, workers and the labor authority can consult it.
- Companies must check that those they hire comply with the law. If they do not, they are jointly liable for the labor and Social Security obligations of the subcontractor.
- Violations are punished under the Law on Infractions and Sanctions in the Social Order, which is amended to classify failures in accreditation, registration, the Subcontracting Book and subcontracting levels as serious or very serious offenses.
Who it affects
- Construction contractors and subcontractors: They must prove prevention training, register in the registry, respect subcontracting levels and keep the Subcontracting Book.
- Self-employed workers in the sector: They cannot subcontract their work, and if they hire employees they are treated as contractors or subcontractors.
- Site developers (promotores): They can hire several contractors directly and are liable if an extension of subcontracting is approved without justified cause.
- Construction workers and their representatives: They must be informed about hiring and subcontracting and can access the Subcontracting Book.
Words worth knowing
- Subcontratación (subcontracting)
- The practice of a company passing part of the work it was hired to do on to another company.
- Nivel de subcontratación (subcontracting level)
- Each step in the chain: the contractor is the first link, the first subcontractor the second, and so on.
- Promotor (developer)
- The person or entity on whose behalf the construction work is carried out.
- Dirección facultativa (technical management)
- The technicians appointed by the developer to direct and oversee the execution of the work.
- Responsabilidad solidaria (joint liability)
- Two companies are each fully responsible for the same debt or obligation, even if only one failed to comply.
It summarizes the law as published in the BOE. It is written by artificial intelligence and may contain mistakes: the official text is what counts. Read the official text · How we make summaries
Where it stands
How far did it get?
It took 7 of 7 steps. It reached BOE, and today it is passed.
- Introduced5 April 2004Someone registers the text in the Congreso.
- Admitted20 April 2004The Bureau of the Congreso accepts it and, for a members’ bill, the plenary decides whether to consider it.
- Amendments4 January 2005Groups propose changes.
- Committee13 December 2005A committee goes through the text in detail.
- Plenaryno dateAll 350 deputies vote.
- Senate9 May 2006The Senate can pass it, amend it or veto it.
- BOE28 September 2006It is published in the Official State Gazette (BOE) and comes into force.
See the 16 official steps on a timeline
Was there a plenary vote?
We have no plenary vote linked to this law in the Congreso’s data.
What happens next
What happens now?
It is law, or will be once published in the BOE. It comes into force on the date its own text sets.
The same initiative in the other chamber:
- VIII Legislature, Senate Private member's bill regulating subcontracting in the construction sector.
Presented before in:
- VI Legislature, Senate Private member's bill regulating subcontracting in the construction sector.
- VII Legislature, Congreso de los Diputados· Rejected Private member's bill regulating subcontracting in the construction sector.
- VII Legislature, Congreso de los Diputados· Rejected Private member's bill regulating subcontracting in the construction sector.
Published in the BOE: Law 32/2006, of October 18, regulating subcontracting in the Construction Sector
Sources
Where does all this come from?
- Congreso de los Diputados, file 122/000047
Official title, type, author, dates and stage.
Retrieved 11 November 2026
- BOE, BOE-A-2006-18205
The law as published.
Retrieved 11 November 2026
- The data comes from the open files of the Congreso, the Senate and the BOE, unaltered.
- Each deputy’s province is the one of their seat on the day of the vote.
- We only say “passed” or “rejected” when the majority needed is certain; otherwise we say which side had more votes.