The verdict in three sentences
Custom software for engagement management at a consulting firm costs, in 2026, between 30,000 and 65,000 EUR, over a 5-to-7-month timeline. It links consultant staffing, time entry, invoicing and per-engagement margin into a single control view. The gain is not cosmetic: a few points of recovered utilization are often worth more than the project cost.
What drives a firm's profitability
Two metrics decide margin: utilization (billable time / available time) and per-engagement margin (invoice - consultant cost). Without a tool, these numbers arrive too late, in a spreadsheet, after the engagement ends.
| Metric | Without a dedicated tool | With custom software |
|---|---|---|
| Utilization known | End of quarter | Real time |
| Per-engagement margin | Estimated, after the fact | Calculated continuously |
| Effort overrun | Detected late | Early alert |
| Consultant staffing | Shared spreadsheet | Unified capacity view |
| Actuals-based invoicing | Re-keyed | From logged time |
| Reporting lead time | 3 - 5 days | Instant |
Making utilization visible in real time lets you reassign an under-loaded consultant before the month is lost: the most direct source of ROI.
What the scope covers
2026 order of magnitude for a Dakar-based studio serving a Toronto firm of 15 to 40 consultants.
| Module | Effort (person-days) | Indicative budget |
|---|---|---|
| Engagements & milestones | 10 - 16 | 6,000 - 10,000 EUR |
| Staffing & capacity plan | 12 - 18 | 7,000 - 11,000 EUR |
| Time entry (timesheets) | 8 - 14 | 5,000 - 9,000 EUR |
| Invoicing & progress | 8 - 12 | 5,000 - 8,000 EUR |
| Margin & profitability | 8 - 12 | 5,000 - 8,000 EUR |
| Management dashboards | 6 - 10 | 4,000 - 7,000 EUR |
The time entry + margin pair is the heart of the system: without reliable time, no profitability calculation is credible.
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Mini case study
Ms. Nguyen, partner at a Toronto consulting firm (28 consultants, average day rate 850 EUR), tracks utilization on a spreadsheet updated at month-end. Her observed average is 72%. She invests 52,000 EUR in a custom tool. Real-time visibility lets her reassign under-loaded consultants and lift utilization to 77%, i.e. +5 points. Across 28 consultants at ~210,000 EUR of annual production each, those 5 points represent ~290,000 EUR of extra billable production per year. The project pays for itself in under 3 months of utilization gain.
FAQ
Why is it better than a spreadsheet? A spreadsheet gives a month-end snapshot; the tool gives a real-time film. Reassigning an under-loaded consultant a week earlier can be worth thousands in production.
Can time link to invoicing? Yes. Logged timesheets feed actuals or fixed-fee invoicing with progress tracking, removing re-keying and making revenue reliable.
How is per-engagement margin calculated? Invoice issued minus the loaded cost of assigned consultants (days x daily cost), continuously. You immediately see engagements that slip.
How long to deploy? 5 to 7 months. We often start with engagements + staffing + time, then add margin and management dashboards.
Is it relevant under 15 consultants? Below that, an off-the-shelf tool may suffice. Custom wins when staffing gets complex and every utilization point matters.
Let's scope your project. Tell us your consultant headcount, average day rate and priorities (staffing, time, margin): we price the scope. 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.
