The verdict in three sentences
A network of 4 staffing agencies handling 300 paper timesheets per week loses on average 2 to 4 days between the end of an assignment and the client invoice. A timesheet app with client signature on mobile costs roughly 25,000 to 60,000 EUR excl. VAT as a custom build in 2026, and pays for itself mainly through released cash and fewer payroll errors. The right scope fits into four building blocks: worker entry, client approval, weekly payroll export, invoicing export.
What paper costs a staffing agency in Lille
The timesheet remains the pivot document of temporary work: it triggers the worker's pay and the client company's invoice. When it travels on paper, scanned or photographed, each step adds delay and re-keying risk. In the Lille metropolitan area, where logistics, food processing and manufacturing concentrate short assignments, weekly volume climbs fast.
| Item | Paper or photo process | App process | Gap (2026 order of magnitude) |
|---|---|---|---|
| End of week to client invoice | 4 to 7 days | 1 to 3 days | 2 to 4 days saved |
| Entry time per timesheet | 3 to 5 min | 0.5 to 1 min (check) | 75 to 85% less |
| Data entry error rate | 2 to 4% | 0.5 to 1% | 1 to 3 points avoided |
| Lost or unreadable timesheets | 1 to 2% | close to 0 | fewer disputes |
| Client reminders for signature | 15 to 25 per week | 3 to 6 (automatic reminders) | 70% fewer |
| Invoice disputes | 3 to 5% of invoices | under 1% | signed, timestamped proof |
For a network invoicing 400,000 EUR excl. VAT per month, saving 3 days of invoicing delay means roughly 40,000 EUR less working capital requirement, without renegotiating anything with clients.
Functional scope and its price
The budget gap between 25,000 and 60,000 EUR excl. VAT comes down to the number of integrations and business rules (overtime rates, meal allowances, travel allowances, client company agreements). Here is a realistic breakdown for a 4-agency network.
| Module | Content | Custom budget excl. VAT (2026 order of magnitude) |
|---|---|---|
| Worker entry (mobile PWA) | Start, end, breaks, optional geolocation | 5,000 to 10,000 EUR |
| Client approval | Mobile signature, secure link, batch approval by team leader | 4,000 to 9,000 EUR |
| Rules engine | 25% and 50% overtime, night, Sunday, meal allowances | 5,000 to 14,000 EUR |
| Weekly payroll export | File or API to the staffing payroll software | 3,000 to 9,000 EUR |
| Invoicing export | Coefficient per client, grouping by assignment contract | 3,000 to 8,000 EUR |
| Agency back office | Dashboard, reminders, anomalies, rights per agency | 4,000 to 8,000 EUR |
| Hosting, security, GDPR | EU hosting, logging, data purge | 1,000 to 2,000 EUR first year |
Staffing management software on the market often offers a timesheet module at around 3 to 8 EUR per active worker per month. Custom development makes sense when client companies have very heterogeneous rules or when the standard module does not allow client approval on mobile without creating an account.
Watch points before signing
Three topics make projects drift. First, the evidential value of the signature: a simple timestamped signature with an access log is enough in most cases, a qualified electronic signature is rarely needed. Second, personal data: geolocating temporary workers must be limited to clock-in, justified and mentioned in the GDPR notice. Third, client adoption: if the team leader has to create an account, they will not approve. A unique link by SMS or email, valid for 72 hours, gives much better rates.
| Criterion | Recommended threshold |
|---|---|
| Timesheets approved within 48 h | over 90% |
| Client approval time | under 30 seconds |
| Time to production | 10 to 16 weeks |
| Pilot | 1 agency, 3 clients, 4 weeks |
Mini case study
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Illustrative scenario: Julien, director of a network of 4 staffing agencies in Lille, Roubaix, Tourcoing and Lens, handles 300 timesheets per week. Two assistants each spend 8 hours per week re-keying, i.e. 16 hours at 32 EUR loaded cost, about 26,600 EUR per year. The 2.5% error rate generates about 30 payroll corrections per month at 20 EUR of processing each, i.e. 7,200 EUR per year. With an app at 42,000 EUR excl. VAT, re-keying drops to 3 hours per week and errors to 0.7%. Estimated annual saving: about 21,600 EUR of time and 5,200 EUR of corrections, nearly 27,000 EUR, plus the cash released by 3 days of faster invoicing. Payback: about 19 months on direct costs alone.
FAQ
How much does a timesheet app for a staffing agency cost in 2026?
Expect roughly 25,000 to 60,000 EUR excl. VAT for a custom build depending on integrations. A standard vendor module costs more like 3 to 8 EUR per active worker per month.
Does a client signature on mobile hold up in a dispute?
A simple, timestamped signature tied to the signer's identity and an access log is solid evidence in most invoicing disputes. It brings disputes down below 1% of invoices.
Can the app connect to our staffing payroll software?
Yes, through a weekly file export or an API when the vendor provides one. Budget 3,000 to 9,000 EUR excl. VAT depending on the complexity of pay items.
How long does deployment take?
A typical project takes 10 to 16 weeks, including a 4-week pilot on one agency and three clients. Rollout to all 4 agencies then takes 2 to 3 weeks.
Do we need to geolocate temporary workers?
It is not mandatory. If you do, limit geolocation to clock-in time and inform workers in line with GDPR.
Let's scope your project. Send us your weekly timesheet volume, payroll software and overtime rules: we will price the scope, budget and rollout plan. 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.
