The verdict in three sentences
A custom supplier extranet for a northern-France manufacturer costs between 30,000 and 80,000 EUR over 12 to 20 weeks, with the ERP connector alone accounting for 20 to 35% of the budget. Done well, it cuts order-processing times by 30 to 50% by eliminating emails, PDFs and re-keying. The item that blows the budget is never the interface: it is ERP data quality and EDI integration complexity.
Modules and integration costs
An effective supplier extranet is not a simple portal: it syncs orders, acknowledgements, quality documents and invoices with your system. The connector to SAP, Sage X3 or Dynamics and the EDI protocol concentrate most of the complexity.
| Module | Role | 2026 indicative budget |
|---|---|---|
| Order portal | Place/track orders online | 6,000-12,000 EUR |
| Document management | Contracts, certificates, invoices | 5,000-10,000 EUR |
| ERP connector (SAP/Sage) | Bidirectional sync | 10,000-25,000 EUR |
| EDI flows | Standardised exchange (EDIFACT) | 6,000-18,000 EUR |
| Supplier space + roles | Accounts, permissions, KYC | 4,000-8,000 EUR |
| Purchasing dashboard | Lead times, disputes, KPIs | 4,000-9,000 EUR |
| Indicative total | — | 30,000-80,000 EUR |
What ERP integration really changes
The value of an extranet comes from killing double data entry. Without integration, a buyer still retypes orders into SAP: you move the problem without solving it.
| Metric | Before extranet | After extranet | 2026 gain |
|---|---|---|---|
| Order processing time | 3-5 days | 1-2 days | -30 to -50% |
| Data-entry errors | frequent | near zero | -70 to -90% |
| Buyer time per order | 20-30 min | 5-8 min | ~-75% |
| Billing disputes | high | reduced | -40 to -60% |
| Real-time visibility | emails | live portal | continuous |
Mini case study
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Sophie, IT director at an automotive supplier near Lille, manages 140 suppliers and 900 orders a month. Before, each order took 25 buyer-minutes, about 375 hours/month. She invests 62,000 EUR in an extranet connected to Sage X3 with EDI flows. After go-live, time per order drops to 7 minutes, i.e. 105 hours/month: 270 hours saved. At a loaded cost of 45 EUR/h, savings reach ~12,000 EUR per month, paying back the project in a little over 5 months.
FAQ
Why is the ERP connector so expensive? Because you must map business objects (orders, items, third parties), handle errors and secure bidirectional sync. Plan for 10,000 to 25,000 EUR depending on the ERP and data cleanliness.
EDI or API: which to choose? EDI remains unavoidable with large buyers and retail; REST APIs/webhooks suit modern suppliers. Most projects combine both.
What is the go-live timeline? Between 12 and 20 weeks, often 4 to 6 of them for ERP integration and end-to-end testing alone.
Can we start without ERP integration? Yes, a standalone portal ships in 6-8 weeks for 15,000-25,000 EUR, then you connect the ERP in phase 2 to spread the investment.
How do we secure supplier access? Named accounts, roles, MFA and action logging. For strategic suppliers, add KYC validation and electronic document signing.
Let's scope your project. Tell us your ERP, order volume and exchange protocols (EDI/API), and we will price the priority modules. 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.
