Domestic sub-contractor
Sub-contractors are appointed by main contractors to carry out part of the works on their behalf. As construction has become more complicated and more specialist construction techniques have been developed, it has become increasingly common for contractors to sub-contract others rather than employing a large workforce themselves.
The use of sub-contractors enables the main contractor to undertake more complex projects whilst not unacceptably increasing their risk, however, concerns have been expressed about the prevalence of sub-contractors because of a perception that the main contractor has less control over the skills and training of sub-contractor employees and so there may be a negative impact on quality and health and safety on site.
Sub-contractors can be classified as:
In addition, on management contracts the works will be carried out by 'works contractors' and on construction management contracts the works will be carried out by 'trade contractors', although technically trade contractors are not sub-contractors as they are contracted by the client, and only managed by the construction manager.
A domestic sub-contractor is any sub-contractor, other than a nominated-sub contractor, that the main contractor sub-contracts to carry out part of the works. The work of the sub-contractor is the responsibility of the main contractor as far as the contract between the main contractor and the client is concerned.
A sub-contractor can be considered domestic if:
- They were freely selected by the contractor.
- They were selected by the contractor from a list of at least three possible sub-contractors.
This means that named sub-contractors in effect become domestic sub-contractors once they are appointed by the main contractor.
There can be uncertainty about whether a sub-contractor is domestic or is nominated, where for example, the contractor is free to select from a list, but it transpires that only one of the sub-contractors named on the list is actually capable of carrying out the works required.
[edit] Related articles on Designing Buildings
- Collaborative practices.
- Construction supply chain payment charter.
- Contractor.
- Fair payment practices.
- Named sub-contractors.
- Nominated sub-contractors.
- Selected subcontractor.
- Specialist contractor.
- Specialist designer.
- Sub-contractor.
- Trade contractor.
- Works contractor.
[edit] External references
- Building article:What sort of subbie are you?
Featured articles and news
We're expanding our collaborative mission by launching DB Intelligence, an exclusive market research advisory panel. Built environment professionals can now get paid to share their expertise on industry trends, products and services.
Panel members receive direct financial incentives for participating in research projects like short surveys, 1-2-1 interviews and focus groups. Register today to shape the future of the construction sector.
Planning condition discharge in England and Wales
A brief exoplanation from a building compliance expert, with further links.
Overheating guidance and tools for building designers
Guidance for dealing with element of building fabric control that have increasing importance.
Shading for housing, a design guide
From the Good Homes Alliance and British Blind and Shutter Association.
UK Standard Skills Classification (SSC)
A shared framework for describing skills needs.
Social media ban consultation comes to close
CIOB urges UK Government to consider social media’s role in careers guidance in ban debate.
The latest of eight Skills England apprenticeship units
The addition of battery manufacturing welcomed by ECA with a warning about the risks of fast-tracked apprenticeship units.
Building Control Independent Panel final report
A precis of a key report led by Dame Hackitt with full recommendations and link to the government response.
Building Safety recap April, 2026
A short and longer run-through of the month, with links to further information and sources.
CIAT May 2026 briefing.
From medieval scribes to modern word art.
ECA welcomes crackdown on late payment and push for clean energy, whilst CIOB seek fixed cladding removal timeframes.
Cyber Security in the Built Environment
Protecting projects, data, and digital assets: A CIOB Academy TIS.
Managing competence in the built environment
ITFG publishes new industry guide on how to meet the ICC principles.
The UK's campaign to reduce noise pollution: Mythbusting, articles and topic guides.





















Comments