The verdict in three sentences
A B2B extranet in Berlin runs between 25,000 and 55,000 EUR in a standard version and 55,000 to 110,000 EUR in an advanced version with workflows and multi-role management. A realistic timeline is 12 to 22 weeks, with maintenance of 900 to 2,500 EUR/month. Custom becomes profitable as soon as your negotiated pricing, access rights and partner processes fall outside the rails of a vendor platform.
What a B2B extranet delivers to your partners
A B2B extranet equips your resellers, distributors and partners with a private space: up-to-date catalog, per-client negotiated pricing, online ordering, tracking, contractual documents and communication. Unlike a public site, everything is personalized by role and contract. It is a direct revenue lever: a partner who orders autonomously 24/7 orders more and calls your sales reps less.
Complexity — and therefore cost — comes mostly from fine-grained rights management (who sees which prices, stocks, documents) and CRM/ERP integration to sync products, pricing, balances and orders in real time.
Detailed cost lines (2026, order of magnitude)
| Module | Standard (EUR) | Advanced (EUR) |
|---|---|---|
| Discovery & architecture | 4,000 – 7,000 | 7,000 – 14,000 |
| Catalog & negotiated pricing | 5,000 – 11,000 | 11,000 – 22,000 |
| Ordering & B2B cart | 5,000 – 10,000 | 10,000 – 20,000 |
| Rights & multi-role management | 3,000 – 7,000 | 8,000 – 18,000 |
| Validation workflows | — | 6,000 – 14,000 |
| CRM/ERP integration | 5,000 – 12,000 | 12,000 – 26,000 |
| UAT & go-live | 3,000 – 6,000 | 5,000 – 10,000 |
| Project total | 25,000 – 55,000 | 55,000 – 110,000 |
Add hosting (60 to 300 EUR/month) and maintenance (900 to 2,500 EUR/month) for security, evolutions and technical support.
Custom build vs vendor platform (Salesforce Experience Cloud)
| Criterion | Salesforce Experience Cloud | Custom extranet |
|---|---|---|
| License | 25 – 75 EUR/user/month | 0 (owned code) |
| Cost 100 users / 3 years | 90,000 – 270,000 EUR | 55,000 – 110,000 EUR + maintenance |
| Customization | Framed by the platform | Total |
| ERP integration | Connectors + dev | Native, custom |
| Vendor lock-in | High | None |
| Time-to-market | 8 – 16 weeks | 12 – 22 weeks |
The vendor platform reassures and starts fast, but per-user licensing grows heavy as the network scales: at 100 active partners, the subscription often exceeds the amortized cost of a custom build. Custom wins over time and on freedom to evolve.
Mini case study
Marc, sales director of a 40-person B2B distributor in Berlin, manages 85 resellers whose orders come by email and phone. His 3 reps spend around 25 percent of their time entering and confirming orders, an estimated annual cost of 48,000 EUR. With a standard extranet at 42,000 EUR, 60 percent of orders shift to self-service: he frees up the equivalent of 0.9 FTE, about 29,000 EUR/year. The extranet pays back in under 18 months, not counting the average basket that grows when partners order autonomously.
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FAQ
How much does a B2B extranet cost in Berlin in 2026?
A standard extranet (catalog, pricing, ordering) costs 25,000 to 55,000 EUR. The advanced version with workflows and multi-role management rises to 55,000 – 110,000 EUR depending on the number of integrations.
What is the go-live timeline?
Plan for 12 to 22 weeks. Rights management and ERP integration are the lines that stretch the schedule most; a tight scope can ship in 12-14 weeks.
Custom extranet or Salesforce Experience Cloud?
Salesforce starts fast but costs 25 to 75 EUR/user/month: at 100 active partners, custom (build + maintenance) becomes cheaper over 3 years while offering total customization.
How do you handle different pricing per client?
That is the heart of a B2B extranet: each partner sees their negotiated prices, stocks and documents through fine-grained rights. This module represents 3,000 to 18,000 EUR depending on complexity.
What maintenance budget should I plan?
Maintenance sits between 900 and 2,500 EUR/month, roughly 11,000 to 30,000 EUR/year, covering security, fixes and small evolutions.
Let's scope your project. Tell us your number of partners, pricing rules and target ERP; we'll frame a standard (25-55k EUR) or advanced (55-110k EUR) extranet. 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.
