The verdict in three sentences
For an HR consulting firm with 18 consultants running 140 engagements a year, an off-the-shelf PSA (Professional Services Automation) costs EUR 35 to 80 per user per month, or EUR 7,500 to 17,300 a year, and a custom build EUR 30,000 to 55,000, then EUR 5,000 to 9,000 a year. The financial lever is utilisation: tracking it weekly lifts it from 68 to 76%, which is worth far more than the tool. Engagement profitability, calculated on actual time rather than the budget sold, is the second reason to invest.
What engagement management software does
| Function | What it delivers | Estimated gain for 18 consultants |
|---|---|---|
| Staffing and capacity planning | 8-week availability view, skills (recruitment, workforce planning, payroll, training) | 2 to 3 h less of staffing meetings per week |
| Timesheets | Weekly timesheet by engagement and phase, on mobile | Completion rate from 70% to 98% |
| Engagement profitability | Actual time at full cost, margin vs budget sold | Overruns spotted at 30% completion instead of at the end |
| Milestone billing | Invoices by milestone or percentage complete, deposits | Time to invoice cut from 12 to 3 days |
| Engagement expenses | Expense claims with photo, rebilling to client | 1 to 2 days a month of data entry avoided |
| Sales pipeline | Proposals, win rate, workload forecast | 3-month forecast 85% reliable |
| Partner dashboard | Utilisation, average realised day rate, margin by client | Weekly steering instead of quarterly |
Off-the-shelf PSA or custom: the 2026 costed comparison
| Criterion | Off-the-shelf PSA | Custom build |
|---|---|---|
| Entry cost | EUR 1,500 to 6,000 (setup, training) | EUR 30,000 to 55,000 |
| Annual cost for 18 users | EUR 7,560 to 17,280 | EUR 5,000 to 9,000 (hosting, maintenance) |
| Time to go live | 4 to 8 weeks | 3 to 5 months |
| Fit with HR offers (fixed fees, advisory retainers, contingency recruitment) | Partial | Complete |
| Accounting and CRM integration | Standard connectors | Dedicated connectors (Xero, Sage, HubSpot) |
| Scaling to 30+ consultants | Linear cost per user | Stable cost |
| 5-year cost (order of magnitude) | EUR 39,000 to 92,000 | EUR 50,000 to 100,000 |
For 18 consultants, an off-the-shelf PSA is usually the rational choice. Custom becomes relevant if the firm sells contingency recruitment (fees indexed on the candidate's salary), fractional HR director retainers, or plans to exceed 30 consultants within three years. A middle path is to keep a PSA and build a custom partner dashboard for EUR 8,000 to 15,000.
What makes the project succeed
The first cause of failure is timesheet discipline: without it, every metric is wrong. Set a simple rule (submit by 5 pm Friday, automatic reminder on Monday) and make entry possible in under 3 minutes on mobile. The second is the cost model: value each consultant at full cost (loaded salary plus a share of overheads), otherwise engagement margins will look flattering. Finally, involve engagement managers in defining standard phases, so budgets sold can be compared with actual time.
Mini case study
Camille, partner at an HR consulting firm in Strasbourg, 18 consultants, about 3,780 available days a year (210 days per consultant). Initial utilisation: 68%, or 2,570 billed days. Average realised day rate: EUR 900. Chosen project: a PSA at EUR 55 per user per month (EUR 11,880 a year) and a custom partner dashboard at EUR 12,000. After one year, utilisation reaches 76%, or 302 more billed days and EUR 271,800 of additional revenue. The first-year cost of EUR 23,880 is covered in under 6 weeks of additional output.
FAQ
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How much does engagement management software for a consulting firm cost in 2026?
An off-the-shelf PSA costs EUR 35 to 80 per user per month, or EUR 7,500 to 17,300 a year for 18 people. A custom build starts around EUR 30,000.
How do we calculate the real profitability of an engagement?
Multiply the days actually spent by each consultant's full daily cost, then compare with the price sold. A gap of more than 15% at mid-point should trigger a review with the client.
What utilisation should an HR consultancy target?
A 2026 order of magnitude is 72 to 78% for consultants and 40 to 55% for partners who carry business development. Below 65%, the firm's margin erodes quickly.
Is milestone billing compatible with our accounting?
Yes, the software generates invoices by milestone and exports them to Xero, Sage or similar. Deferred revenue is calculated automatically at period end.
How long does deployment take?
Allow 4 to 8 weeks for a PSA, including 2 weeks to set up live engagements. A custom build takes 3 to 5 months.
Let's scope your project. Share your headcount, engagement types and current tools: we will cost a partner dashboard or a complete solution, with an indicative budget and 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.
