How to Ensure Subcontractor Compliance on UK Construction Projects

Quick Answer

Ensuring subcontractor compliance on a UK construction project comes down to three jobs working together: collecting the right documents, keeping them current, and being able to prove it. DocCompliance does all three for UK main contractors — a self-serve portal for collection, automated chasing for currency, and one-click CIS and H&S packs for proof.

The three jobs of subcontractor compliance

  1. Collection — getting the right documents in from every sub: insurance, CSCS, RAMS, CIS details, H&S policy, prequalification.
  2. Currency — keeping them valid, because a certificate valid at onboarding lapses mid-project.
  3. Proof — evidencing it for HMRC under the Construction Industry Scheme and the HSE under CDM 2015.

Most contractors do the first job and assume the other two. Under the April 2026 CIS reform — where directors face personal exposure under HMRC's reasonable-knowledge standard — currency and proof are where the risk now sits.

Why it gets harder over time, not easier

At engagement, everyone's documents are fresh. Then cards expire, policies renew on their own dates, new workers arrive, and subs move between sites. Compliance is per worker and per document, so the workload grows with every sub and every site — which is why manual tracking quietly falls behind.

A repeatable process that holds up

  • Onboard and prequalify each subcontractor, capturing identity, UTR and VAT details
  • Collect via a self-serve portal — subs upload directly, you review
  • Read and decide — AI extraction pulls expiry dates; each sub and worker gets a clearance verdict
  • Chase automatically at 60, 30 and 15 days before expiry
  • Prove with a one-click CIS Pack (HMRC) and H&S Pack (HSE) per subcontractor

How DocCompliance runs it

DocCompliance is the platform UK main contractors use to manage their subcontractors' compliance end to end — collection, chasing, a clearance verdict per worker, QR site check-in, and the two regulator-ready packs from a single dataset. The H&S manager stops being the human spreadsheet.

Key facts

  • Subcontractor compliance is three jobs: collection, currency and proof.
  • Under the April 2026 CIS reform, currency and proof carry director-level risk.
  • Compliance is per worker and per document, so it scales with subs and sites.
  • DocCompliance covers all three and produces CIS and H&S packs per subcontractor.

Frequently asked questions

Who is responsible for subcontractor compliance on a UK project? The main contractor (as principal contractor under CDM 2015) carries the duty for subcontractor competence and safe systems of work, and — under the CIS reform 2026 — the due-diligence burden for HMRC.

What documents should I collect from subcontractors? At minimum: employers' and public liability insurance, CSCS cards, RAMS, H&S policy, CIS registration details and a completed prequalification.

How do I prove compliance if audited? DocCompliance produces a per-subcontractor CIS Pack for HMRC and H&S Pack for HSE in one click, each pulling the full timestamped record.