The verdict in three sentences
A custom staffing tool for a consulting or HR firm costs between 25,000 and 90,000 EUR in 2026, delivered in 10 to 18 weeks. In a firm, margin hinges on consultant utilization: a well-designed staffing tool raises it by 8 to 12 points, worth far more in margin than the project itself. A spreadsheet hits its limit as soon as staffing becomes a multi-mission, multi-consultant puzzle.
Spreadsheet, generic SaaS or custom tool
The spreadsheet is free but fragile; generic SaaS is fast but rigid on day rate and rebilling; custom fits your economic model.
| Criterion | Spreadsheet | Generic staffing SaaS | Custom Kolonell |
|---|---|---|---|
| Cost | 0 EUR (hidden time) | 15-40 EUR/user/mo | 25,000-90,000 EUR |
| Real-time utilization view | No | Yes | Yes, fine per consultant |
| Day rate & margin per mission | Manual | Standard | Custom, per grade |
| Timesheets & rebilling | Re-entry | Partial | Automated |
| Workload forecast | No | Limited | Pipeline + staffing |
| Payroll/accounting integration | No | Rare | Yes |
Staffing modules and margin impact
Each module attacks a profitability leak: under-utilization, eroded day rate, unbilled time.
| Module | Function | 2026 impact (estimate) |
|---|---|---|
| Consultant planning | Assignment, conflicts, availability | +8 to 12 pts utilization |
| Day rate & mission margin | Loaded cost vs sold day rate | +3 to 6 pts margin |
| Timesheets | Time entry per mission/task | -90 % missed time |
| Automatic rebilling | Invoices from timesheets | Billing delay -15 days |
| Workload forecast | Sales pipeline + staffing | Anticipate hiring |
| Profitability reporting | Margin per consultant/client | Staffing decisions |
For a 30-consultant firm at an 800 EUR average day rate and a 210 billable-day target, gaining 10 utilization points means about 21 more billed days per consultant, i.e. ~504,000 EUR of additional revenue firm-wide.
Mini case study
Sophie, partner at a 28-consultant firm in Paris (820 EUR average day rate), ran staffing on a shared spreadsheet at 68 % utilization. After a custom tool at 62,000 EUR: real-time availability and workload forecasting lift utilization to 78 % (+10 pts), about 21 more billed days per consultant. Across 28 consultants that is ~480,000 EUR of additional annual revenue, for a project recovered in under 2 months of margin.
FAQ
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How much does a custom staffing tool cost in 2026?
Between 25,000 and 90,000 EUR depending on consultant count, day-rate/margin granularity and payroll/accounting integration. A 20-40 consultant firm often lands around 45,000-65,000 EUR.
Why not stay on a spreadsheet?
A spreadsheet gives no real-time availability view or per-mission margin; beyond ~15 consultants it breeds staffing conflicts and unbilled days.
Does it handle timesheets and rebilling?
Yes, consultants log time per mission and invoices are generated automatically, cutting the billing delay by about 15 days.
Can we track margin per mission and per consultant?
Yes, loaded cost is compared to the sold day rate to show margin per mission, client and consultant, the basis for staffing decisions.
What is the rollout timeline?
10 to 18 weeks, with a first version covering planning and timesheets, then rebilling and margin reporting.
Let's scope your project. Share consultant count, day-rate logic and integration needs (payroll, accounting): indicative budget 25,000-90,000 EUR, timeline 10-18 weeks. 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.
