The verdict in three sentences
In 2026, a custom B2B client portal is budgeted between 25,000 and 70,000 EUR, depending on the number of modules and the depth of integration with your systems. Plan for 10 to 18 weeks for an orders + invoices + support scope with SSO and role-based access control (RBAC). The return on investment comes from fewer inbound calls and less administrative time, typically paid back within 9 to 14 months.
What makes up a client portal budget
A client portal is not a brochure site: it is an authenticated application connected to your tools (ERP, billing, CRM). Price is driven mainly by the number of modules and integration complexity. Here is a 2026 order-of-magnitude breakdown for a B2B SME.
| Module | Scope | Unit cost 2026 (EUR) | Timeline |
|---|---|---|---|
| Authentication & SSO | Login, MFA, SSO (Google/Microsoft) | 4,000 - 8,000 | 1-2 wk |
| Roles & permissions (RBAC) | Admin, buyer, accountant, read-only | 3,000 - 6,000 | 1-2 wk |
| Order tracking | Statuses, history, documents | 5,000 - 11,000 | 2-3 wk |
| Invoices & credit notes | Viewing, PDF, export | 4,000 - 9,000 | 2-3 wk |
| Support & tickets | Create, track, attachments | 4,000 - 8,500 | 2-3 wk |
| Notifications | Email, SMS, in-app | 2,500 - 5,500 | 1 wk |
| ERP/CRM integration | API, real-time sync | 6,000 - 16,000 | 3-5 wk |
A minimal core (auth + orders + invoices) starts around 25,000 EUR. A full portal with support, notifications and real-time ERP integration reaches 55,000 to 70,000 EUR.
SSO, roles and security: the line items that move the price
SSO and RBAC separate an amateur portal from a reliable B2B platform. A large-account customer will often require login through their own directory (Azure AD, Okta) and an audit log tracing every action.
| Requirement | Budget impact (EUR) | Why |
|---|---|---|
| Enterprise SSO (SAML/OIDC) | +4,000 to +8,000 | Connects to customer directory |
| Full audit log | +3,000 to +6,000 | Compliance, GDPR traceability |
| Granular roles per entity | +3,500 to +7,000 | Multi-entity, isolation |
| EU hosting + backups | +2,000 to +4,000 /yr | Data residency |
| Load & acceptance testing | +2,500 to +5,000 | Production reliability |
Mini case study
Julien, director of operations at an industrial equipment distributor in Nantes, manages 320 professional customers who call on average four times a month to check an order status or retrieve an invoice. Two agents spend 60% of their time on this. Julien invests 44,000 EUR in an orders + invoices + support portal with SSO. After launch, calls drop 55%, freeing the equivalent of a half-time role (about 27,000 EUR/year fully loaded). The portal pays back in ~19 months, then delivers recurring net savings while improving customer satisfaction.
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What is a realistic minimum price for a B2B client portal in 2026?
An authenticated core with order tracking and invoice viewing starts around 25,000 EUR. Below that you get a simple document space, not a true transactional portal.
How long to deliver a full portal?
Plan for 10 to 18 weeks depending on module count and ERP integration complexity. A reduced core can ship in 6-8 weeks.
Must I rebuild the portal when my ERP changes?
No, if the integration goes through a well-designed API layer. Still budget 10 to 15% of the initial cost per year for maintenance and evolution.
Is SSO essential?
For large-account customers, yes: they want to sign in through their directory. For small business customers, a simple login with MFA is enough and cuts cost by 4,000 to 8,000 EUR.
Can we start small then expand?
Yes, and it is recommended: ship an orders + invoices core, measure usage, then add support and notifications. A modular architecture avoids rebuilding everything.
Let's scope your project. Tell us your priority modules (orders, invoices, support), your ERP and your customer volume, and we will frame a scope between 25,000 and 70,000 EUR. 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.
