The verdict in three sentences
For a manufacturer with 300 to 600 employees, a custom supplier extranet costs EUR 30,000 to 80,000 (about USD 32,500 to 87,000) excluding tax and ships in 4 to 6 months, ERP connection included. It pays off as soon as purchasing handles more than 200 active suppliers and wastes time chasing certificates, order confirmations and invoices. The most reliable gain is half an FTE freed in purchasing, plus fewer quality disputes and better captured early payment discounts.
Custom extranet or vendor SRM module
ERP vendors and SRM (supplier relationship management) specialists offer ready-made modules. They suit standard processes but become expensive in licenses and rigid once the manufacturer has specific quality requirements (material certificates, PPAP, safety data sheets).
| Criterion | Custom extranet | Vendor SRM module |
|---|---|---|
| Initial investment | EUR 30,000 to 80,000 | EUR 10,000 to 40,000 integration |
| Yearly cost | EUR 6,000 to 12,000 (hosting + maintenance) | EUR 15,000 to 40,000 in licenses |
| Rollout time | 4 to 6 months | 3 to 9 months depending on integrator |
| Fit with quality processes | Full | Configuration, sometimes custom development |
| SAP Business One or Sage X3 connection | API or dedicated connector | Native if same vendor, otherwise paid connector |
| Access cost for suppliers | Free | Sometimes charged to suppliers |
| 5-year cost (median assumption) | 55,000 + 5 × 9,000 = EUR 100,000 | 25,000 + 5 × 27,500 = EUR 162,500 |
2026 estimate, excluding tax. The vendor module remains preferable if your processes are standard and your ERP vendor includes a portal in maintenance.
Functional scope and pricing
| Module | Indicative cost | Expected gain |
|---|---|---|
| Supplier onboarding and profile (registration, bank details, compliance certificates) | EUR 6,000 to 12,000 | Complete files before the first order |
| Certificate upload and expiry alerts | EUR 5,000 to 10,000 | Zero expired certificates at audit |
| Purchase order publishing and confirmations | EUR 8,000 to 18,000 | Lead times confirmed within 48 h instead of 5 days |
| Invoice upload and matching with goods receipts | EUR 6,000 to 15,000 | -50 % invoices with discrepancies |
| Automatic email reminders | EUR 2,000 to 5,000 | 6 to 8 h a week of chasing avoided |
| Supplier rating (quality, lead time, price) | EUR 3,000 to 8,000 | Annual supplier review prepared in 1 day |
| ERP connector | EUR 8,000 to 20,000 | No more double entry |
An effective first version groups onboarding, certificates, purchase orders and the ERP connector, about EUR 45,000. Invoices and rating come in a second phase.
Success conditions
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Appoint a lead buyer who spends 20 % of their time on the project for 4 months. Onboard first the 50 suppliers that represent 80 % of spend: they generate most of the exchanges. Provide a dedicated address and a one-page guide for suppliers, and set a date after which certificates and confirmations sent by email are no longer processed.
Mini case study
Thomas, purchasing director of a 400-employee manufacturer near Stuttgart, manages 350 suppliers with Sage X3, emails and an Excel certificate tracker. He launches a custom extranet at EUR 55,000 with EUR 9,000 a year in maintenance. The chasing and data entry time saved equals 0.5 FTE of a purchasing assistant, EUR 25,000 a year in loaded cost. Add EUR 6,000 of early payment discounts now captured thanks to faster invoice processing and EUR 4,000 of avoided quality disputes. Total gain: EUR 35,000 (USD 38,000) a year, for a net yearly gain of EUR 26,000 after maintenance. The project pays for itself in just over 2 years.
FAQ
Will suppliers agree to use an extranet? Yes, if access is free and simple. With a one-page guide and a switchover date announced 2 months ahead, 80 % of strategic suppliers are active within 3 months.
Must the extranet be connected to the ERP? Without a connection, buyers re-enter orders and confirmations, which cancels much of the gain. A connector costs EUR 8,000 to 20,000 depending on whether the ERP exposes an API (SAP Business One Service Layer, Sage X3 API) or not.
Can the extranet handle mandatory e-invoicing? It complements the certified platform chosen for e-invoicing rules (such as Germany's B2B e-invoice mandate) without replacing it. Invoice and receipt matching stays useful, and interfacing with the platform costs EUR 3,000 to 8,000.
What security level should we plan? Two-factor authentication, strict per-supplier isolation, access logging and EU hosting. A penetration test before launch costs EUR 4,000 to 8,000.
Can we start small? Yes, a first phase limited to certificates and onboarding costs EUR 12,000 to 20,000 and ships in 8 to 10 weeks.
Let's scope your project. Describe your ERP, number of suppliers and main pain points: we will price a supplier extranet in phases, indicative budget EUR 30,000 to 80,000, delivered in 4 to 6 months. 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.
