UK construction ‘high-risk’ slavery label: compliance notes for project teams
Reviewed by Joe Ashwell

First reported on New Civil Engineer
30 Second Briefing
Construction in the UK has been formally classified as a “high-risk” sector for modern slavery in a new national report, alongside small cash-based businesses such as vape shops, barbers and hand car washes. The designation points to particular vulnerability in labour-intensive, subcontractor-heavy supply chains on building sites, including temporary works, groundworks and finishing trades where migrant and agency labour are common. Contractors can expect closer scrutiny of right-to-work checks, labour agency practices and tier-2/3 subcontractor oversight on major infrastructure and building projects.
Technical Brief
- Formal “high-risk” classification is expected to trigger more intrusive site inspections and labour-audit powers.
- Principal contractors will need auditable chains of right-to-work checks extending through all labour-only subcontractors.
- Labour agencies supplying groundworkers, formwork crews and finishing trades will be key focus points for compliance reviews.
- Client prequalification and framework renewals are likely to demand explicit modern-slavery risk assessments and mitigation plans.
- Site induction and toolbox talks will increasingly need to cover modern-slavery indicators and confidential reporting routes.
- Procurement teams may have to re-map supply chains, flagging high-risk packages such as temporary accommodation and transport.
- For geotechnical and civils packages, contract conditions are expected to harden around worker welfare, documentation and unannounced audits.
Our Take
Within our 153 Policy stories, UK-focused pieces tagged to Safety and Projects often concentrate on site-level risk, so classifying construction as ‘high-risk’ for modern slavery pushes compliance expectations deeper into procurement and labour-supply chains rather than just on-site practices.
For New Civil Engineer, which also fronts industry-facing initiatives like the British Construction & Infrastructure Awards 2026, this topic is likely to migrate quickly into award and prequalification criteria, giving contractors a commercial incentive to evidence modern slavery due diligence.
UK-based operators reading this alongside Heathrow Airport’s innovation challenge coverage may see an opportunity to treat modern slavery controls as a design and digital-innovation problem (e.g. traceable materials, verified labour pathways) rather than purely a legal or HR compliance issue.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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