The verdict in three sentences
A B2B extranet for partners or resellers in Berlin costs between EUR 25,000 and 90,000 in 2026, the gap driven by the number of roles, ERP integrations and security requirements. A first usable version (catalog, orders, roles) ships in 10 to 14 weeks from EUR 32,000. The line item that blows up budgets is real-time synchronization with the ERP (stock, pricing, credit): budget EUR 8,000 to 20,000 per connector.
Budget per workstream (2026, EUR)
A reseller extranet breaks down into functional workstreams that can be billed independently.
| Workstream | Price EUR | Lead time |
|---|---|---|
| Accounts + roles (admin, sales, reseller) | 6,000 - 11,000 | 2 wk |
| B2B catalog + per-client pricing | 7,000 - 14,000 | 2-3 wk |
| Order entry + B2B cart | 6,000 - 12,000 | 2-3 wk |
| Order tracking + statuses + invoices | 5,000 - 10,000 | 2 wk |
| ERP integration (stock, pricing, credit) | 8,000 - 20,000 | 3-5 wk |
| Hardened security (SSO, logging, GDPR) | 4,000 - 12,000 | 2-3 wk |
A full reseller extranet with ERP lands around EUR 45,000 to 70,000.
Where the security budget goes
For an extranet open to external partners, security is not optional: it protects your pricing and your customer data.
| Security item | Price EUR | Value |
|---|---|---|
| SSO / federated login | 3,000 - 7,000 | One partner account |
| Fine-grained rights (RBAC) | 2,500 - 6,000 | Partition by role |
| Logging + audit trail | 2,000 - 5,000 | GDPR traceability |
| Encryption + backups | 1,500 - 4,000 | Business continuity |
| External security audit | 3,000 - 8,000 | Proof for your clients |
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Mini case study
Karim, sales director of a wholesaler in Berlin manages 60 resellers who place orders by email and phone. He invests EUR 52,000 in an extranet: catalog with per-client pricing, order entry and ERP stock sync, delivered in 13 weeks. His 3 sales reps spent 2 h/day re-keying orders; the extranet automates 80% of the entry. Saving: 3 x 2 h x 0.8 x 21 days x EUR 32/h = EUR 3,225/month, or EUR 38,700/year. The extranet pays for itself in 16 months, and entry errors fall, cutting credit notes.
FAQ
What is the price difference between an extranet and a simple client portal? An extranet handles multiple external roles, differentiated pricing and B2B order logic: budget 60 to 100% more than a single-role portal, i.e. a floor around EUR 25,000.
Is ERP integration mandatory? Not at launch: you can start with a daily CSV import (saving EUR 8,000). But for reliable real-time stock, API sync at EUR 8,000-20,000 quickly pays off.
How long to deliver a reseller extranet? A usable v1 in 10 to 14 weeks; a full multi-brand platform with ERP and SSO takes 5 to 7 months.
What is the annual maintenance cost? Between EUR 6,000 and 15,000/year including integrations, around 15-18% of the initial cost.
Can the extranet go international? Yes: multi-currency, multi-language and per-country VAT add EUR 5,000 to 12,000 depending on the number of markets.
Let's scope your project. Tell us your partner roles, your ERP and your monthly order volume: we frame a v1 deliverable in 10 to 14 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.
