The verdict in three sentences
A supplier extranet in Amsterdam is budgeted between 35,000 and 80,000 EUR, the spread driven mainly by ERP integrations (SAP, Microsoft Dynamics, Exact) and EDI. Plan for 4 to 6 months of development, with granular role management and SSO as non-negotiable prerequisites. Benefits are measurable from the first quarter: -50 % of order emails and processing time cut in half.
What drives the price
A supplier extranet is heavier than a client portal because it touches the core of the supply chain. Here are the 2026 ranges in EUR.
| Functional block | Indicative cost (EUR) | Complexity |
|---|---|---|
| Core (auth, roles, supplier dashboard) | 14,000 - 22,000 | Medium |
| Catalogs & per-supplier pricing | 8,000 - 14,000 | Medium |
| Order placement & tracking | 9,000 - 16,000 | High |
| EDI connector (EDIFACT/AS2) | 10,000 - 20,000 | Very high |
| Two-way ERP integration | 8,000 - 18,000 | High |
| Delivery tracking & receipts | 5,000 - 9,000 | Medium |
| SSO + entitlement management | 6,000 - 10,000 | Medium |
A focused extranet (core + catalogs + orders + ERP) sits around 45,000 to 62,000 EUR. EDI adds a technical layer justified only beyond 30-40 high-volume suppliers.
Custom extranet vs off-the-shelf procurement platform
2026 comparison for a buyer with 60 active suppliers.
| Criterion | Custom extranet | SaaS procurement platform |
|---|---|---|
| Year 1 cost | 45,000 - 62,000 EUR | 12,000 - 25,000 EUR |
| Recurring cost / year | 8,000 - 12,000 EUR | 12,000 - 30,000 EUR |
| Fit to processes | Total | Limited |
| In-house ERP integration | Native | Often a paid add-on |
| Data ownership | You | Vendor |
| Rollout time | 4-6 months | 6-10 weeks |
Beyond 3 years, custom usually becomes cheaper while matching your business rules, especially when the ERP is central.
Mini case study
Marc, purchasing director of a 90-person construction distributor in Amsterdam, processed 1,400 supplier orders per month by email and phone, tying up 3 coordinators. After a 54,000 EUR extranet (core + catalogs + orders + Exact integration), order emails dropped 50 % and average processing time fell from 48 h to 22 h. The team absorbed a 20 % volume increase without hiring, saving a role estimated at 42,000 EUR/year. ROI reached in 16 months.
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FAQ
Do we absolutely need EDI?
No. EDI is justified beyond 30-40 high-volume suppliers or in sectors that mandate it (retail, automotive). Below that, an ERP connector plus structured CSV import/export is enough and cheaper.
How long until the first go-live?
A first version (orders + catalogs) can ship in 10-12 weeks, with EDI and advanced integrations delivered in successive batches up to 6 months.
How do we handle security with external third parties?
SSO or strong authentication, granular per-supplier roles, strict data partitioning and audit logging. Budget 6,000 to 10,000 EUR for this layer, essential in B2B.
Can we connect multiple ERPs or warehouses?
Yes. Each system adds 8,000 to 18,000 EUR depending on API maturity. An API-gateway architecture lets you add systems gradually without rebuilding everything.
What return on investment should we expect?
Clients see -40 to -50 % of emails, processing time cut in half and a 20-30 % drop in data-entry errors. ROI typically lands between 14 and 20 months.
Let's scope your project. Tell us your supplier count, your ERP and your EDI needs, and we will frame the scope and budget. 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.
