The verdict in three sentences
A client project-tracking portal for a services agency is budgeted at 18,000 to 40,000 EUR in 2026, with a useful MVP deliverable in 6 to 8 weeks. The return is measured in satisfaction and retention (+15 to +25%): a client who sees progress in real time renews and refers more. The classic trap is trying to build everything at once; the right strategy is a dashboard + notifications core, enriched by iteration.
The modules and their MVP prioritisation
Not all modules are equal. Here is how to prioritise to ship value fast.
| Module | Priority | Range (EUR) | Retention impact |
|---|---|---|---|
| Project dashboard (progress, milestones) | MVP | 5,000 - 9,000 | High |
| Automated notifications (steps, delays) | MVP | 2,500 - 5,000 | High |
| Deliverable sharing + client sign-off | MVP | 3,000 - 6,000 | Medium |
| Project-contextual messaging | Phase 2 | 3,500 - 7,000 | Medium |
| Integrated invoicing + online payment | Phase 2 | 4,000 - 9,000 | Medium |
| Time/budget reporting | Phase 3 | 3,000 - 7,000 | Low |
The MVP (dashboard + notifications + deliverables) is roughly 10,500 to 20,000 EUR and delivers 70% of perceived value. Later phases are added based on real client feedback.
Lead time, maintenance and business model
The full project ships in 3 to 5 months. Here is the 2026 order of magnitude for recurring items.
| Item | 2026 order of magnitude |
|---|---|
| Full build cost | 18,000 - 40,000 EUR |
| MVP only (phase 1) | 10,500 - 20,000 EUR |
| Annual maintenance | 12-16% of build |
| Hosting + monitoring | 1,200 - 3,600 EUR/yr |
| MVP lead time | 6-8 weeks |
| Full scope lead time | 3-5 months |
A well-designed client portal also becomes a sales argument: it differentiates the agency in pre-sales and justifies premium positioning.
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Mini case study
Sarah runs a 22-person communications agency in London, with 45 active clients generating 1.3 M EUR in annual revenue. Her retention rate is 72%. She invests 26,000 EUR in a client portal (MVP + invoicing). By reducing tracking friction, retention rises to 82% (+10 points), i.e. around 6 clients kept per year at an average value of 29,000 EUR, representing ~174,000 EUR of preserved revenue. Even conservatively attributing 30% of that effect to the portal, the gain (~52,000 EUR) covers the investment in the first year. Maintenance 14%/yr = 3,640 EUR.
FAQ
Why not use an existing project-management tool? Tools like Asana or Monday are built for internal teams, not for a polished, on-brand client experience. A custom portal showcases your agency and fits your process.
How much is the minimal MVP? A dashboard + notifications + deliverables core sits between 10,500 and 20,000 EUR, deliverable in 6 to 8 weeks. It is the best starting point.
Is integrated invoicing worth it? Yes if you bill fixed-fee or by milestone: online payment, automated reminders and a cut of several days in collection time. Count 4,000 to 9,000 EUR.
What real impact on retention? The observed order of magnitude is +15 to +25%, because transparency on progress reduces client anxiety and misunderstandings. The effect is stronger on long projects.
Can the portal connect to our tools? Yes: project-management tool, accounting, CRM. Budget 3,000 to 8,000 EUR per integration depending on the available API.
Let's scope your project. Tell us your active-client count, your average project length and your current tools: we'll price an MVP then an evolution path. 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.
