The verdict in three sentences
A B2B extranet connects your partners, resellers or suppliers to your internal systems : in Berlin it costs 25,000 to 45,000 EUR net for a core with roles and a secure catalogue, and 50,000 to 90,000 EUR net with real-time ERP integrations. The most underestimated line is not development but integrations and security, which often account for 40 to 50 % of the budget. Plan 14 to 24 weeks from design to production depending on connection depth.
Roles, permissions and functional scope
An extranet lives or dies on its role management : a reseller does not see the same prices as a key account, an internal sales rep manages several accounts. Here is the budget impact of the main modules.
| Module | Range EUR net | Complexity |
|---|---|---|
| Multi-role management + account hierarchy | 5,000 - 10,000 | High |
| Catalogue with per-segment pricing | 6,000 - 12,000 | High |
| Order entry + validation workflow | 7,000 - 14,000 | High |
| Order tracking + logistics statuses | 4,000 - 9,000 | Medium |
| Contractual document space | 3,000 - 6,000 | Low |
| Partner reporting (sales, outstanding) | 5,000 - 11,000 | Medium |
| Messaging / support requests | 3,000 - 6,000 | Low |
Account hierarchy (head office, subsidiaries, points of sale) is the main cost driver : the deeper the tree, the more visibility and pricing rules multiply.
ERP integrations and security : the real center of gravity
An extranet disconnected from the ERP forces double data entry that ruins adoption. Connectors and security hardening are the non-negotiable foundation. 2026 order of magnitude by integration type.
| Integration / security | Range EUR net | Timeline |
|---|---|---|
| ERP connector (SAP, Sage, Odoo) read | 6,000 - 12,000 | 3 weeks |
| ERP write connector (orders) | 9,000 - 18,000 | 4 - 5 weeks |
| Real-time stock synchronization | 5,000 - 10,000 | 2 - 3 weeks |
| SSO / partner directory (SAML, OIDC) | 4,000 - 8,000 | 2 weeks |
| Security audit + penetration testing | 4,000 - 9,000 | 2 weeks |
| Encryption, logging, GDPR | 3,000 - 6,000 | 1.5 weeks |
Always require a staging environment mirroring production to test ERP flows with real data before cutover : that is the difference between a controlled launch and a client-visible incident.
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Mini case study
Marc runs a 60-employee industrial distributor near Berlin, with 140 active resellers. Each reseller orders by phone or email : two sales-admin staff spend 30 combined hours per week (loaded cost 30 EUR/h), that is 900 EUR/week and around 43,000 EUR/year.
He invests 62,000 EUR net in an extranet with per-segment priced catalogue, order entry and a write connector to his Sage ERP. After 5 months, 70 % of orders go self-service : sales-admin time drops to 10 hours/week, saving 600 EUR/week or 28,800 EUR/year. Add the reduction in entry errors (estimate -2 % disputes on 4.5 M EUR of orders = ~90,000 EUR of friction avoided over three years), and the full ROI lands around 24 to 30 months.
FAQ
What is the price difference between a simple portal and an integrated extranet ? A showcase portal without ERP starts at 15,000 EUR net ; an extranet with an ERP write connector exceeds 45,000 EUR net. The gap is entirely down to integrations and validation workflows.
How much does connecting to my ERP cost ? Expect 6,000 to 18,000 EUR net per connector depending on whether it is read-only or write, and on the quality of your ERP vendor's API.
What delivery timelines should I plan ? From 14 to 24 weeks depending on integration depth, with a first usable version (catalogue + ordering) deliverable in 10 to 12 weeks.
Is security really a separate line ? Yes : SSO, audit, encryption and GDPR compliance represent 11,000 to 23,000 EUR net. On an extranet open to third parties, it is a non-negotiable investment.
Can we start without ERP integration then add it ? Absolutely : we first ship the catalogue and ordering core with CSV import, then plug in the ERP in phase 2. This smooths the budget and secures adoption.
Let's scope your project. Tell us your ERP, your partner count and your ordering workflows : we frame an extranet budgeted between 25,000 and 90,000 EUR net with a phased integration plan. 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.
