The verdict in three sentences
A custom client portal replaces scattered email threads with one secure, auditable space — documents, tickets and billing in a single place. For a mid-sized services firm, the realistic 2026 budget is 30,000 to 70,000 EUR excl. VAT depending on modules and integration depth. The real payoff is not cosmetic: it is 8 to 12 support hours recovered each week and a client relationship that stops leaking into inboxes.
What does each module cost in 2026?
A portal is built brick by brick. You do not have to fund everything in the first sprint: start with the document vault and messaging, add payment later. Here are 2026 orders of magnitude for a custom build hosted in the EU.
| Module | Scope | 2026 cost (EUR excl. VAT) | Timeline |
|---|---|---|---|
| Core + SSO | Authentication, roles, EU hosting | 8,000 – 14,000 | 3 – 4 wks |
| Document vault | Upload, versioning, per-client vault | 6,000 – 12,000 | 3 – 4 wks |
| Messaging / tickets | Threads, SLA, notifications | 5,000 – 10,000 | 2 – 3 wks |
| Online billing | History, reminders, accounting export | 6,000 – 13,000 | 3 – 4 wks |
| Integrated payment | Card, transfer, reconciliation | 4,000 – 9,000 | 2 – 3 wks |
| Email/SMS alerts | Notifications, weekly digest | 2,000 – 5,000 | 1 – 2 wks |
A full portal therefore reaches 31,000 to 63,000 EUR excl. VAT, consistent with the stated range. SSO (single sign-on via your existing directory) is the highest-return item: it removes password handling from your support desk.
Custom build or generic SaaS?
The question comes up in every steering committee. A generic SaaS portal starts fast but charges per user, and you stay locked into its data model.
| Criterion | Custom portal | Generic SaaS |
|---|---|---|
| Upfront cost | 30,000 – 70,000 EUR | 0 – 5,000 EUR |
| Recurring cost | Hosting 150 – 400 EUR/mo | 12 – 25 EUR/user/mo |
| 60 users / year | ≈ 3,600 EUR | 8,640 – 18,000 EUR |
| Customization | Full | Limited to options |
| ERP/SSO integration | Native | Often an add-on |
| Data ownership | You | Vendor |
At 60 users, SaaS costs 8,640 to 18,000 EUR a year in licences. Over three years, the custom build becomes cheaper while remaining your asset. Below 15 users, SaaS is often the right call.
Mini case study
Claire, CIO of a services mid-cap in Toulouse (85 staff, 220 active clients) receives document requests by email all day. Her support desk spends 10 hours a week finding, resending and filing files. Estimated loaded cost: 32 EUR/hour, i.e. 320 EUR/week or ≈ 16,600 EUR/year.
She invests 48,000 EUR excl. VAT in a portal (SSO core + vault + tickets + billing) delivered in 15 weeks. From go-live, support recovers 9 hours/week (≈ 15,000 EUR/year) and measured client satisfaction rises. Payback: ≈ 19 months, excluding brand and retention gains.
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FAQ
How long does it take to launch a portal?
Budget 12 to 18 weeks for a vault + tickets + billing scope. A vault + SSO MVP alone can ship in 6 to 8 weeks if you deliver in waves.
Is SSO really necessary?
Yes above 30 internal users: it removes password resets (often 20 to 30% of support tickets) and secures access via your existing directory.
Can the data be hosted in the EU?
Yes, and it is recommended for a B2B firm. Sovereign EU hosting costs 150 to 400 EUR/month depending on volume and redundancy needs.
How is billing handled inside the portal?
The billing module shows history, triggers automatic reminders and exports to your accounting. Budget 6,000 to 13,000 EUR excl. VAT depending on integration.
What maintenance budget should I plan?
Between 8 and 15% of build cost per year, i.e. 3,000 to 10,000 EUR, covering enhancements, security and support.
Let's scope your project. Tell us your priority modules (vault, tickets, billing), your user count and your hosting constraints, and we will frame scope and budget. 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.
