The verdict in three sentences
A custom B2B reseller extranet costs between 30 000 and 70 000 EUR in 2026, with the heaviest line item being the ERP connection and per-customer personalised pricing. The realistic timeline is 4 to 6 months. Done well, it cuts sales-desk calls by around 30 % (availability, prices, tracking) and reduces order-entry errors.
What a B2B extranet quote actually covers
A serious quote breaks down every building block. Here are the typical items and their weight.
| Item | Scope | Indicative 2026 cost (EUR) |
|---|---|---|
| Catalogue & per-customer pricing | Price lists, discounts, sales units | 7 000 - 15 000 |
| Online ordering | B2B cart, reordering, lists | 6 000 - 13 000 |
| Balances & documents | Invoices, delivery notes, account status | 5 000 - 11 000 |
| Reseller roles & accounts | Multi-user, approval | 4 000 - 9 000 |
| ERP connection | Stock, prices, orders, customers | 8 000 - 18 000 |
| QA, training, deployment | Testing, data migration, go-live | 4 000 - 9 000 |
Custom extranet or B2B e-commerce module?
A B2B e-commerce platform (Shopify B2B, BigCommerce, Sana) speeds up launch; custom fits complex commercial rules.
| Criterion | B2B e-commerce module | Custom extranet |
|---|---|---|
| Year 1 cost | 12 000 - 35 000 EUR | 30 000 - 70 000 EUR |
| Complex per-customer pricing | Partial | Full |
| Specific business rules | Limited | Bespoke |
| Deep ERP connection | Standard connectors | Bespoke |
| Recurring cost | 3 000 - 15 000 EUR/yr | 6 000 - 14 000 EUR/yr |
| Timeline | 6 - 12 weeks | 4 - 6 months |
Mini case study
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Bart, sales director of a supplies distributor in Amsterdam, deploys an extranet at 52 000 EUR connected to his ERP. His sales desk handled 900 calls/month; with self-service, it loses 30 %, i.e. 270 fewer calls/month. At 6 EUR handling cost per call, that is 1 620 EUR/month, roughly 19 400 EUR/year, not counting the higher average basket from easier reordering. The investment pays back in under three years on this single line item.
FAQ
Can we manage different prices per customer? Yes, that is the heart of the project: price lists, volume discounts and negotiated terms per account, synced with the ERP (8 000 to 18 000 EUR for integration).
How long to go live? Expect 4 to 6 months, with a first version (catalogue + ordering) often delivered in 8 to 10 weeks.
What if our ERP is old? We rely on exports/imports or an intermediate API layer. Integration cost rises if the ERP has no modern API.
Can resellers have multiple accounts? Yes: a multi-user hierarchy with rights (ordering, viewing, approval) and an approval workflow.
What maintenance budget should we plan? From 6 000 to 14 000 EUR/year for hosting, support, security and enhancements.
Let's scope your project. Tell us your ERP, your number of resellers and your pricing rules for a quote, indicative budget 30 000-70 000 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.
