The verdict in three sentences
A custom B2B e-commerce platform costs, in 2026, between 40,000 and 120,000 EUR and ships in 4 to 8 months. It handles customer accounts, per-customer negotiated price lists and the ERP connection that consumer platforms never cover cleanly. The payback comes from self-service: 30 to 70% of orders move online, and the cost of processing one order drops by 40%.
What the budget covers by scope
B2B is not B2C with a different logo. You need per-customer pricing, approvals, credit limits, accounting integration. Here are the budget tiers observed in 2026 on the French market.
| Scope | 2026 budget (EUR) | Timeline | Key content |
|---|---|---|---|
| Simple ordering portal | 40,000 – 55,000 | 4 months | Catalog, customer pricing, cart, ERP export |
| Standard B2B platform | 55,000 – 85,000 | 5 – 6 months | Price lists, approval workflow, real-time ERP link |
| Advanced B2B platform | 85,000 – 120,000 | 6 – 8 months | Multi-entity, credit limits, online quotes, PunchOut, support portal |
| Recurring options | 1,500 – 4,500 / month | — | Maintenance, hosting, enhancements, support |
The cost driver is almost never the catalog: it's the business rules (who sees which price, who approves which order) and the depth of ERP integration.
Where the value is created
A B2B platform's promise is not aesthetic, it's operational. Every order the customer enters is an order your sales team does not re-key.
| Metric | Before platform | After B2B platform | Gain |
|---|---|---|---|
| Self-service orders | 0 – 10% | 30 – 70% | sales team relief |
| Processing cost / order | 12 – 18 EUR | 7 – 10 EUR | − 40% |
| Entry errors | 4 – 8% | 1 – 2% | − 60% |
| Average basket (auto reorder) | base | + 8 to 15% | up-sell |
| Customer ordering delay | hours | minutes | 24/7 |
One-click reordering and visible order history on the customer side mechanically increase purchase frequency.
Mini case study
Antoine, sales director of an industrial-supplies distributor in Lille, handles 3,200 orders/month, 80% entered by phone and email. Average processing cost: 15 EUR/order, i.e. 48,000 EUR/month. He invests 78,000 EUR in a B2B platform with per-customer pricing and ERP connection. Six months later, 55% of orders are self-service. On those 1,760 orders, the cost falls to 8 EUR, i.e. 12,320 EUR instead of 26,400 EUR: 14,080 EUR saved per month. The investment is recouped in under 6 months, before counting the average basket rising 11%.
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FAQ
How much does a custom B2B e-commerce platform cost in 2026?
Between 40,000 and 120,000 EUR depending on the depth of pricing rules and ERP integration. A well-equipped standard B2B platform sits around 55,000 to 85,000 EUR.
How long to go live?
Expect 4 to 8 months. A simple ordering portal starts at 4 months; a multi-entity platform with credit limits and PunchOut climbs to 8 months.
What annual maintenance budget should I plan?
Maintenance and enhancements represent 15 to 20% of the project cost per year, i.e. 1,500 to 4,500 EUR/month including hosting depending on load.
Is custom justified over a SaaS solution?
Yes as soon as you have per-customer negotiated pricing, approval workflows or deep ERP integration that standard apps don't cover. Below that, a SaaS may be enough.
What ROI to expect?
A 40% cut in processing cost and an average basket up 8 to 15% often recoup the project in 6 to 12 months for a high-volume distributor.
Let's scope your project. Tell us your order volume, your ERP and your pricing rules: we'll price the right B2B platform, indicative budget 40,000 to 120,000 EUR, go-live in 4 to 8 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.
