How site managers and construction HR teams capture verified hours, file CIAW automatically, and stay inspection-ready across every project.
On a construction site, time registration is harder than in any office, crews are mobile, subcontractors come and go, and the NSSO is watching. Get it right and payroll runs itself while inspections become a formality; get it wrong and chain liability turns a subcontractor’s lapse into your fine. The practical answer for most contractors is a mobile time-tracking platform that captures GPS-verified hours and files CIAW declarations in the same step. This guide covers the methods, the compliance rules, and the best practices that keep construction teams accurate and compliant.
Quick Navigation
- Why Construction Is Different
- CIAW Obligations on Site
- Registration Methods for Sites
- Best Practices for Site Managers
- Implementation Checklist
- What Changes in 2027
- Managing Site Time Registration with Technology
- Frequently Asked Questions
Why Construction Is Different
Office time registration assumes a fixed location and a stable team. Construction assumes neither. Workers move between sites, multiple subcontractors share a single project, and the people responsible for hours are rarely behind a desk. That is why generic time clocks struggle here and why purpose-built construction solutions exist.
❌ A foreman emailing a weekly spreadsheet of “roughly” who was on site.
✅ Each worker’s hours captured on arrival and departure, GPS-verified, ready for payroll and inspection.
The stakes are higher too. Beyond payroll accuracy, construction carries the CIAW attendance obligation and chain liability, making verified, real-time data a legal necessity rather than a nice-to-have.
CIAW Obligations on Site
| ⚠️ CIAW thresholds for construction: registration is required where no subcontractor exceeds €500K, where one subcontractor exceeds €5K, or where there are two or more subcontractors. Fines run from €300 administrative up to €6,000 per worker per day, and chain liability can place a subcontractor’s failure on the main contractor. |
A construction-ready system files Check-in at Work declarations to the NSSO automatically as workers register, rather than leaving it as a separate manual task. Official enforcement guidance is published by the NSSO at socialsecurity.belgium.be and sector context by the Confederation of Construction at confederatiebouw.be.
Registration Methods for Sites
Different sites call for different capture methods. This table maps the options.
| Method | Best for | Accuracy | CIAW fit | Notes |
| Mobile app | Most crews, multi-site | High (GPS) | ✅ Auto-files | Needs an active connection at registration |
| Site pole / fixed reader | Large, fixed sites | High | ✅ Yes | Has its own connectivity |
| Vehicle-based | Drivers, plant operators | High | ✅ Yes | Ties hours to the vehicle |
| Paper sign-in sheet | Nothing in 2026 | Low | ❌ Non-compliant | Manipulable, not inspector-ready |
Footnote: Suivo registrations are verified at the moment they happen and require an active WiFi or mobile-data connection, nothing is stored unsynced, so timestamps cannot be backdated. On low-signal sites, contractors use fixed Check-in at Work poles with their own connectivity or vehicle-based registration.
Best Practices for Site Managers
- Standardise one registration method per site and brief every crew on it.
- Onboard subcontractors into the same time-tracking system, chain liability makes their gaps your problem.
- Use GPS verification to settle “who was where” disputes before they reach payroll.
- Confirm connectivity coverage across the site before go-live.
- Review CIAW filings weekly so issues surface before an inspection does.
Subcontractors and Chain Liability
Chain liability is the rule that catches most contractors off guard. Because the main contractor can be held responsible for a subcontractor’s missing CIAW registrations, your compliance is only as strong as the weakest party on site. The practical answer is to bring subcontractors into the same registration system from day one, rather than trusting that each maintains its own. When every worker, direct or subcontracted, registers through one Check-in at Work flow, you get a single, verified attendance picture and you remove the gap where a fine usually originates.
❌ Each subcontractor keeps its own records “for their own people”.
✅ Everyone on site registers through the main contractor’s system, with one verified attendance log.
This also simplifies billing and dispute resolution: when a client questions who was on site on a given day, GPS-verified registrations settle it instantly.
Low-Signal Sites: The Honest Options
Construction sites are not always blessed with strong mobile coverage, tunnels, basements and metal-clad halls are real challenges. Because Suivo verifies every registration at the moment it happens and requires an active connection, the right approach is to engineer coverage, not to pretend a registration can count without it. The proven options are fixed Check-in at Work poles with their own connectivity at site entrances, vehicle-based registration through vehicle tracking for drivers and plant operators, and employer-provided WiFi or mobile hotspots in low-signal zones. This keeps data integrity intact: nothing is stored unsynced, so every timestamp is genuine and inspector-ready.
Tying Hours to Plant, Assets and Vehicles
On a busy site, hours are only half the picture, knowing which excavator, which crew and which vehicle those hours relate to turns time registration into genuine operational insight. When registration is linked to asset management and vehicle tracking, you can allocate labour cost to the right project, spot idle plant, and bill clients with evidence rather than estimates. This is where a connected IoT platform pulls ahead of a standalone time clock: the same registration that proves compliance also feeds project costing and equipment utilisation. For contractors running tight margins, that combined view often matters as much as the compliance it guarantees.
Implementation Checklist
- Map each active site and its connectivity.
- Confirm which projects exceed CIAW thresholds.
- Deploy the mobile app to your crews and subcontractors.
- Run a two-week pilot on one project before retiring paper.
- Validate a full payroll cycle, including subcontractor hours, end-to-end.
What Changes in 2027
- January 2027: objective daily working-hours registration becomes mandatory across all sectors, construction included.
- Expect faster, digital NSSO inspections and tighter data-quality expectations.
- Subcontractor onboarding into the main contractor’s system becomes standard practice.
- Live payroll integration replaces manual site-by-site exports; the time-tracking solution is built for it.
Managing Site Time Registration with Technology
Suivo, a Belgian IoT company with over 15 years of experience, offers comprehensive time registration for contractors managing mobile crews and subcontractors. Their platform helps you:
- Capture GPS-verified hours from any site via a mobile time-tracking app.
- File CIAW declarations automatically as workers register.
- Bring subcontractors into one system to manage chain liability.
- Tie hours to plant and vehicles via vehicle tracking.
- Manage every project from one construction-focused platform.
- Export verified hours straight to SD Worx, Partena and Acerta.
Suivo’s IoT platform integrates seamlessly with existing payroll and ERP systems, helping companies like Hoogmartens and B&R Bouwgroep keep accurate records across dozens of active sites.
“Bringing our subcontractors onto the same registration app ended the chain-liability worry. Every worker on site is verified, and payroll no longer chases missing hours.”
– Site Manager, mid-size contractor near Antwerp
Take Action Today
Don’t let scattered timesheets and subcontractor gaps expose your sites to fines. Start by standardising one capture method per site, onboarding subcontractors into a single system, and piloting verified digital registration on your next project.
For more information about time registration in construction, contact Suivo at +32 3 375 70 30 or visit the time-tracking solution page to see how their platform keeps your sites compliant.
Free Site Checklist
Want to manage construction time registration with more confidence? Our Site Checklist gives you a simple, practical overview to capture verified hours, stay CIAW-compliant, and keep full real-time insight across your projects.
Inside, you’ll find:
- The biggest challenges in site time registration today
- How Suivo helps with GPS verification, CIAW filing and subcontractor control
- Real-life success stories from Hoogmartens, B&R Bouwgroep and Cegelec
- Practical solutions for fleet, workforce, and asset management
Frequently Asked Questions
Do construction companies have to register working hours?
Yes, construction sites face CIAW attendance obligations now, and from January 2027 all employers must keep an objective daily working-hours record. A mobile time-tracking system covers both.
How does CIAW work on a construction site?
Each worker registers their attendance electronically, and a capable system files the declaration to the NSSO automatically. See how Check-in at Work handles this for site teams.
What happens if a subcontractor doesn’t register?
Under chain liability, the main contractor can be fined for a subcontractor’s missing registrations. Onboarding everyone into one construction platform closes that gap.
Which app is best for construction time tracking?
Look for GPS verification, automatic CIAW filing and native payroll export. Our comparison of the best digital time-registration tools in Belgium ranks the options for site work.
