The verdict in three sentences
For a general contractor with 120 subcontractors a year, custom subcontractor compliance software costs between EUR 20,000 and 50,000 excl. VAT in 2026. The risk covered is serious: if undeclared work is found at an unchecked subcontractor, the main contractor is jointly liable for contributions and wages, and the company faces fines of up to EUR 225,000. The project ships in 10 to 16 weeks and replaces email reminders and paper files sitting at head office.
The obligations to track and what the software automates
As soon as a contract reaches EUR 5,000 excl. VAT, French labour law requires checking, at signature and then every 6 months until completion, that the subcontractor is up to date with its declarations and contributions (the URSSAF "attestation de vigilance"). On top of this come the 1975 subcontracting law obligations (client acceptance and approval of payment terms, payment delegation or guarantee) and the construction ID card (carte BTP) for every worker on site.
| Obligation | Frequency | Sanction or risk | What the software does |
|---|---|---|---|
| URSSAF compliance certificate | At signature then every 6 months | Joint financial liability, fine up to EUR 225,000 for a company | Collection, security code check, automatic reminders |
| Company registry extract | At signature and renewal | Presumption of undeclared work | Guided upload, date check |
| List of foreign workers requiring permits | At signature and every 6 months | Administrative fines per worker | Online form and archiving |
| Client acceptance and approval of the subcontractor | Before work starts | Subcontract unenforceable, direct action | Validation workflow per site |
| Payment delegation or guarantee | Before work starts | Liability towards the subcontractor | Document generation and signature tracking |
| Workers' construction ID cards | Every assignment | Up to EUR 2,000 per worker, EUR 4,000 if repeated | Register per site, alert if card missing |
| Ten-year liability insurance certificate | Annual | No cover on the structure | Alert 30 days before expiry |
Budget: what each module costs
| Module | Indicative 2026 cost (EUR excl. VAT) |
|---|---|
| Subcontractor portal (document upload, profile, history) | 5,000 to 11,000 |
| Deadline engine and automatic reminders (email, SMS) | 4,000 to 9,000 |
| URSSAF certificate authenticity check | 2,000 to 5,000 |
| Approval and payment delegation workflow per site | 4,000 to 10,000 |
| Construction ID card register and site access | 2,000 to 6,000 |
| Compliance dashboard and payment blocking | 2,000 to 5,000 |
| Testing, migration of 120 files, training | 1,000 to 4,000 |
| Total | 20,000 to 50,000 |
Subscription collection platforms often charge EUR 2,000 to 6,000 a year for this volume, but rarely cover client approval and payment delegation. Custom software becomes worthwhile when you want to automatically block a payment while a document is expired, directly in the progress-payment approval flow.
The key point: linking compliance and payments
A collected certificate only protects you if it is verified and current when you pay. The software shows a green, amber or red status per subcontractor and per site. A progress payment can only be released if the status is green. This simple rule turns a filing tool into a risk-prevention system.
Mini case study
Nathalie, administrative director of an 85-employee general contractor in Lyon, manages 120 subcontractors a year, about 240 six-monthly certificates and 600 documents in total. Her assistant spends 1.5 days a week on it, roughly EUR 16,000 of loaded annual cost. The software cuts this to 0.3 days a week: EUR 12,800 saved per year. The real stake is risk: a single joint-liability reassessment on a EUR 180,000 plastering package can cost EUR 40,000 to 60,000 in claimed contributions. For a EUR 32,000 project and EUR 4,000 of annual maintenance, avoiding one incident pays back the investment.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
Does the software check that the URSSAF certificate is genuine?
Yes, each certificate carries a security code that can be verified on the URSSAF website. The software guides or automates this check and time-stamps the result, useful evidence during an inspection.
Do subcontractors pay to upload their documents?
No, the portal is free for them. A subcontractor takes about 10 minutes to upload documents, then receives an automatic reminder 15 days before each 6-month deadline.
What happens if a certificate expires mid-project?
The status turns red, the site manager and accounts are alerted, and progress payments are blocked until a valid certificate is uploaded.
Can we track second-tier subcontractors?
Yes, the portal lets a subcontractor declare its own subcontractors, with the same checks. This module adds EUR 3,000 to 6,000 to the budget.
How quickly is the tool operational?
Allow 10 to 16 weeks, including 2 weeks for migrating existing files and training site managers.
Let's scope your project. Tell us your number of subcontractors, active sites and management software: we will price the scope, a budget between EUR 20,000 and 50,000, and the go-live timeline. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
