The verdict in three sentences
A custom supplier extranet in Amsterdam costs, in 2026, between 25,000 and 50,000 EUR, with approval workflow and SSO, delivered in 12 to 18 weeks. It moves exchanges out of inboxes: -40% emails, full traceability and -2 days on the order cycle. Versus a SaaS procurement portal, custom wins as soon as your business rules and ERP integration step outside the standard.
Budget lines of a supplier extranet
With 120 suppliers, the challenge is not user count but workflow richness: tenders, multi-level approval, contracts and documents. Here is the 2026 ballpark.
| Line item | Scope | 2026 budget (EUR) | Timeline |
|---|---|---|---|
| Discovery & procurement process | Workshops, specs, mockups | 3,500 - 6,000 | 2-3 wk |
| SSO & directory | Enterprise auth, fine roles | 3,500 - 6,500 | 2 wk |
| Orders & catalogue | Ordering, statuses, history | 5,000 - 9,000 | 3-4 wk |
| Tenders | Submission, comparison, award | 4,000 - 8,000 | 2-3 wk |
| Approval workflow | Multi-level, notifications | 4,000 - 8,000 | 2-3 wk |
| ERP integration & QA | API, tests, go-live | 5,000 - 12,500 | 3-4 wk |
The total lands in the 25,000 - 50,000 EUR range. The line item that drives the budget is almost always ERP integration: a modern API costs little, a legacy system with no interface pushes to the top of the range.
SaaS procurement portal vs custom extranet
| Criterion | SaaS procurement portal | Custom extranet |
|---|---|---|
| Upfront cost | 2,000 - 8,000 EUR | 25,000 - 50,000 EUR |
| Cost per supplier | Sometimes billed/month | Included |
| Monthly cost | 500 - 2,000 EUR/mo | 600 - 1,500 EUR (maintenance) |
| 3-year cost | 20,000 - 80,000 EUR | 46,600 - 104,000 EUR |
| Specific workflow | Limited | Bespoke |
| ERP integration | Standard connectors | Bespoke |
| Data ownership | With the vendor | With you |
SaaS wins when processes are standard and volumes modest. Custom wins when per-supplier billing balloons (120 accounts), when the award workflow is specific, or when the in-house ERP requires deep integration.
Mini case study
Karim is head of procurement at a distribution SME in Amsterdam. His 4 buyers exchange around 3,200 emails/month with 120 suppliers, and the average order cycle is 7 days. Fully loaded cost per handled email: estimated 1.20 EUR (reading, entry, follow-up).
He invests 38,000 EUR in an extranet plus 1,000 EUR/month maintenance. The extranet removes 40% of emails, i.e. 1,280 emails/month: 1,280 x 1.20 = 1,536 EUR/month, minus maintenance, leaving a net admin gain of 536 EUR/month. More importantly, the cycle drops from 7 to 5 days: over 900 orders/month, this -2 days frees cash and cuts stockouts. The tool pays back in roughly 18 to 24 months counting admin time only, faster once cash flow and traceability are valued.
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FAQ
What is the budget for a supplier extranet in 2026?
Between 25,000 and 50,000 EUR for a scope of orders, tenders, contracts and workflow. ERP integration alone can represent 5,000 to 12,500 EUR.
How long to roll out?
Expect 12 to 18 weeks. Procurement-process discovery (2-3 weeks) is decisive: that is where approval workflows are settled.
Is SSO essential?
For enterprise use with 120 suppliers, yes: SSO simplifies access and strengthens security. It represents 3,500 to 6,500 EUR depending on your directory.
Can you connect our ERP?
Yes. With a modern API, integration stays at the low end; a legacy ERP with no interface pushes toward 12,500 EUR and adds 2-3 weeks to the timeline.
What concrete gains can we expect?
A realistic target is -40% emails and -2 days on the order cycle. For 3,200 emails/month at 1.20 EUR, that is about 1,536 EUR/month of admin time saved.
Let's scope your project. Tell us your supplier count, your ERP and your approval workflows: we price an extranet between 25,000 and 50,000 EUR. 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.
