B2B Customer Portal Development Cost in Berlin (2026)

The verdict in three sentences

A B2B customer portal connected to your ERP costs between EUR 45,000 and 110,000 for a mid-sized Berlin distributor, depending on how many data flows you expose and how complex the SAP Business One or Sage X3 integration is. The return comes mainly from fewer inbound calls: 40% fewer calls on a base of 300 per week frees roughly one full-time customer service role. With a 3 to 5 month timeline and maintenance of EUR 800 to 2,000 per month, break-even typically lands between 14 and 24 months.

What your customers want when they call

In a distributor with EUR 45 million in revenue, most service calls require no expertise: a copy of an invoice, a signed delivery note, a shipping date, an account balance. Every one of these already sits in the ERP. The portal simply makes them available 24/7, with per-account login and, for key accounts, SSO (Azure AD, Google Workspace).

Out of 300 calls a week, a well-adopted portal absorbs about 120 calls, roughly 40%. That is the 2026 order of magnitude on comparable projects, provided the launch is backed by an outreach campaign to the first 50 customers.

What a B2B customer portal costs in Berlin in 2026

Price depends less on design than on integration depth. Exposing read-only invoices is simple; syncing customer-specific negotiated prices and multi-warehouse stock is not. Berlin agency day rates (EUR 750 to 1,100) explain the premium over French projects.

Three factors move the bill: the quality of your ERP's APIs (an older on-premise version needs a middleware connector), the number of user roles (buyer, accountant, branch manager) and migration of historical documents.

Technical choices that protect your investment

A sound architecture separates the portal from the ERP with a sync layer: the portal reads a replicated database refreshed every 5 to 15 minutes and never queries the ERP live on every click. The result: no slowdown for operations, and a portal that stays up during ERP maintenance. Also require access logs (who downloaded which invoice), EU hosting and a code reversibility clause.

Mini case study

Jonas, CFO of an industrial supplies distributor in Berlin (EUR 45 million revenue, 1,800 customer accounts), orders an intermediate portal for EUR 68,000 with maintenance at EUR 1,200 per month. Before the project, his 4 account managers handled 300 calls a week at 6 minutes each, 30 hours in total. The portal absorbs 40%: 12 hours freed per week, about 540 hours a year. At EUR 48 fully loaded per hour, that is EUR 25,900 per year, plus a cash benefit: online statements cut DSO by 3 days, bringing about EUR 370,000 of receivables in earlier. Three-year cost: 68,000 + 43,200 = EUR 111,200. Direct three-year gain: EUR 77,700, excluding the cash effect and the redeployment of staff to sales.

FAQ

Do we need to change ERP to launch a customer portal?

No. SAP Business One, Sage X3 and most mid-market ERPs expose usable APIs or exports. A middleware connector costs EUR 7,000 to 15,000 if your ERP is old.

How long before customers adopt it?

Plan 3 to 6 months to reach 60% active accounts. Targeted outreach to your 50 largest customers speeds adoption considerably.

Is SSO essential?

It is for key accounts managing dozens of buyers. Adding it costs EUR 4,000 to 8,000 and cuts password reset requests by about 70%.

What does EUR 800 per month of maintenance cover?

Typically 4 to 6 hours of fixes, monitoring and security updates. Above EUR 2,000 per month, you are also funding new features.

Can we start small?

Yes, a core invoices and delivery notes portal at EUR 45,000 delivered in 3 months lets you measure the drop in calls before investing in online ordering.

Let's scope your project. Send us your ERP, call volume and the documents to expose: we will price a portal between EUR 45,000 and 110,000 with a 3 to 5 month plan. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.