The verdict in three sentences
A custom client portal (documents, tickets, billing) budgets at 18,000 to 38,000 EUR for an MVP and 30,000 to 45,000 EUR for a full version in 2026. The realistic timeline is 10 to 16 weeks, at day rates of 500 to 750 EUR in the Amsterdam market. Add maintenance of 700 to 1,500 EUR/month and hosting of 150 to 400 EUR/month: it is the cost of ownership over 3 years that matters, not the build alone.
What a client portal budget covers
A client portal replaces email back-and-forth with a secure space where your clients consult documents, track tickets and pay invoices. Price depends mostly on the number of modules, the security level and integrations (billing, CRM, e-signature).
| Phase | 2026 scope | EUR range | Timeline |
|---|---|---|---|
| Discovery & UX | Workshops, wireframes, specs | 2,500 - 5,000 | 1-2 wks |
| Authentication & roles | Login, SSO, per-profile rights | 3,000 - 6,000 | 1-2 wks |
| Document space | Upload, versions, secure sharing | 3,500 - 7,000 | 2-3 wks |
| Tickets / support | Creation, tracking, notifications | 3,000 - 6,000 | 2 wks |
| Online billing | History, payment, reminders | 4,000 - 9,000 | 2-3 wks |
| Testing & go-live | QA, deployment, training | 2,000 - 4,000 | 1-2 wks |
MVP or full version: where to set the cursor
The smart 2026 strategy is to ship a useful MVP in 10-12 weeks, then extend. Compare both scenarios before committing budget.
| Criterion | MVP portal | Full version |
|---|---|---|
| Budget | 18,000 - 38,000 EUR | 30,000 - 45,000 EUR |
| Timeline | 10-12 weeks | 14-16 weeks |
| Modules | 3-4 core modules | 6+ modules |
| Integrations | 1 (billing) | 3+ (CRM, ERP, e-sign) |
| Monthly maintenance | 700 - 1,100 EUR | 1,100 - 1,500 EUR |
| Hosting/month | 150 - 250 EUR | 250 - 400 EUR |
Mini case study
Julien, operations director of a services SME in Amsterdam (60 staff), manages 220 clients by email. His teams spend around 25 hours/week resending documents and invoices. At a loaded cost of 35 EUR/hour, that is about 39,000 EUR/year in admin time. He invests 32,000 EUR in a portal MVP (documents + tickets + billing) delivered in 11 weeks, plus 950 EUR/month maintenance. The portal removes about 60% of requests, saving 23,400 EUR/year. First-year cost: 32,000 + 11,400 = 43,400 EUR; the operational break-even is reached around month 22, after which the portal nets about 12,000 EUR/year.
FAQ
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How much does a custom client portal really cost in 2026?
Expect 18,000 to 38,000 EUR for an MVP in Amsterdam and 30,000 to 45,000 EUR for a full version. The reference day rate sits between 500 and 750 EUR depending on the seniority of the profile.
What timeline should I plan for?
Between 10 and 16 weeks depending on the number of modules and integrations. An MVP focused on 3-4 core functions ships in 10-12 weeks, which reduces risk and spreads the investment.
Do I need to budget beyond delivery?
Yes: maintenance (700 to 1,500 EUR/month) and hosting (150 to 400 EUR/month) are unavoidable. Over 3 years, this cost of ownership can match the initial build budget.
Can I start small and extend?
It is even recommended. An MVP shipped quickly generates adoption and real feedback, which guides the next modules without wasting budget on unused features.
Can the portal connect to my billing tool?
Yes, via API or export/import. A billing integration costs on average 4,000 to 9,000 EUR depending on the tool's complexity and how much reminder automation you need.
Let's scope your project. Tell us your priority modules, your client volume and an indicative budget, and we will scope an MVP deliverable in 10-12 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.
