The verdict in three sentences
A bespoke client portal costs between 20,000 and 55,000 EUR in 2026 and ships in 10 to 16 weeks, versus a plug-in CRM module live in days but rigid. Custom pays off the moment you want your journey (SSO, document vault, notifications, billing API) rather than a vendor's stock form. Budget 400-900 EUR/month of maintenance afterwards, easily offset by the 40 % drop in support calls.
Bespoke vs CRM module: the real trade-off
A CRM client module (Salesforce, HubSpot, Zoho) is quick to switch on and cheap up front, but it locks you into its data model and charges per external user. Bespoke needs a heavier initial outlay, but you own the code, the UX and the integrations.
| Criterion | CRM module | Bespoke portal |
|---|---|---|
| Upfront cost | 3,000-9,000 EUR | 20,000-55,000 EUR |
| Cost per external user | 8-25 EUR/month | 0 EUR |
| Time to launch | 2-4 weeks | 10-16 weeks |
| UX customisation | Limited | Total |
| Billing integration | Connector-dependent | Bespoke API |
| Code ownership | No | Yes |
| Annual maintenance | Included/variable | 4,800-10,800 EUR |
For an SME with 50-300 active clients, bespoke turns profitable from year two: beyond ~120 external accounts, per-user CRM licences exceed the portal's maintenance.
What the budget buys, by work package
A serious quote breaks down into deliverable packages. Here is a 2026 order of magnitude for a London services SME.
| Work package | Scope | Estimate EUR |
|---|---|---|
| Authentication & SSO | Secure login, Google/Microsoft SSO, roles | 3,500-7,000 |
| Orders area | Status tracking, history, reminders | 4,000-9,000 |
| Document vault | Upload/download, versions, permissions | 3,000-6,500 |
| Billing & API | Invoice access, payment, accounting API | 4,500-10,000 |
| Notifications | Email/SMS, deadline alerts | 2,000-4,500 |
| Admin back-office | Client management, dashboards | 3,000-8,000 |
The low end is a Starter core (auth + orders + documents) around 20,000 EUR; the high end adds the billing API and a full back-office toward 55,000 EUR.
Mini case study
Mark, director of an industrial cleaning SME in London, manages 140 B2B clients. His three assistants spend about 6 hrs/day answering follow-up calls (where is my order, send me October's invoice). At 22 EUR/hr loaded cost, that is ~29,000 EUR/year. He invests 34,000 EUR in a portal (SSO auth, orders, documents, invoices) plus 650 EUR/month maintenance. The portal absorbs 40 % of requests, saving ~11,600 EUR/year, plus a commercial upside: clients renew faster once they can see their history. Estimated payback: ~2.5 years, not counting the premium image with his key accounts.
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FAQ
What does a bespoke client portal really cost in 2026?
Between 20,000 and 55,000 EUR depending on scope. An auth + orders + documents core runs around 20,000-30,000 EUR; adding a billing API and back-office pushes toward 45,000-55,000 EUR.
How long to deliver it?
Allow 10 to 16 weeks: 2-3 weeks of scoping and design, 6-10 of development, 2-3 of testing and go-live. A reduced core can ship in 8 weeks.
Do I need maintenance after launch?
Yes, budget 400-900 EUR/month for fixes, security updates and small enhancements. It is the guarantee that the portal stays reliable and compliant.
Is SSO essential?
If your clients already use Google Workspace or Microsoft 365, yes: SSO removes password friction and lifts adoption. Budget 3,500-7,000 EUR for full authentication.
Can you connect my existing billing software?
In most cases yes, via API or connector. Integration budget ranges from 4,500 to 10,000 EUR depending on whether your tool (Sage, Xero, QuickBooks...) exposes a documented API.
Let's scope your project. Tell us your client count, current tools (CRM, billing) and target budget, and we will map the scope into packages with a realistic 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.
