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CP 124 · All regimes

JC 124 — Construction (blue-collar)

Construction social audit (JC 124) — ConstruBadge, Checkin@Work, subcontracting.

The sector most inspected by the Belgian social inspection. Group S audits your 22 mandatory documents and verifies the subcontracting chain.

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JC 124 under joint SIRS/SIOD + Constructiv oversight

Cascading subcontracting, posted workers, mobile sites: JC 124 stacks specific obligations (ConstruBadge, Checkin@Work, Limosa-1, joint liability). Construction sites are subject to recurring targeted inspections by the social inspectorate. A single missing Dimona or badge on site = level 4 sanction per affected worker.

5 key obligations

  1. Checkin@Work — mandatory electronic attendance

    All real-estate works > €500,000 or > 30 days. Daily recording of every worker present on site.

  2. ConstruBadge active for every worker

    Personal Constructiv badge required on site. Validity check before site access.

  3. Limosa-1 for posted workers

    Prior declaration required for every foreign worker posted to Belgium. Level 3 without a valid declaration.

  4. Joint liability for subcontractors

    Verify NSSO / tax debts of subcontractors on every invoice. 35% to be withheld if debts are found.

  5. Temporary construction contract — special forms

    Construction agency work = limited grounds + written contract before start. Possible reclassification as open-ended if form not respected.

Maximum SCC penalties

Level 4 (SCC Art. 181) on Dimona, Limosa, Checkin@Work: criminal — – — and/or imprisonment 6 months – 3 years, multipliable per worker (cap 100×). Joint NSSO liability on subcontractor debts.

Why Group S in this sector

Construction specialists for 70 years

Group S supports hundreds of JC 124 companies — from solo site to general contractor. All Constructiv mechanisms natively integrated in the audit.

Real-time SIRS/SIOD site monitoring

Our lawyers track sectoral inspection campaigns and alert exposed clients before the visit.

Secured subcontracting chain

Automated checks of subcontractor NSSO debts. Joint-liability tracking integrated into payroll reporting.

Frequently asked questions

No — thresholds are €500,000 or 30 days. Below those, the classic attendance register applies, but ConstruBadge and Dimona remain due.

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Other sectors

CP 302 · HospitalityCP 200 · Employees (APCB)CP 140 · Transport & logisticsCP 100 · Blue-collar (auxiliary)CP 209 · Metal white-collar
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