The verdict in three sentences
A custom B2B e-commerce platform costs in 2026 between 30,000 and 80,000 EUR excl. VAT depending on modules (per-customer pricing, multi-user accounts, ERP integration). The realistic timeline is 12 to 20 weeks, because the core is not the catalogue but the commercial logic: pricing grids, quotas, payment terms. The ROI comes from automating recurring orders, freeing your sales reps from manual entry.
B2B vs B2C: why custom changes everything
A B2C site sells one price to everyone. A B2B site must show a different price depending on the logged-in customer, handle accounts with multiple buyers, purchase orders, free-shipping thresholds and often payment at 30 or 60 days. These rules justify bespoke development.
| Criterion | B2C site | Custom B2B platform |
|---|---|---|
| Pricing | Single public price | Negotiated grids per customer/segment |
| Accounts | 1 buyer = 1 account | Multiple buyers per company |
| Payment | Instant card | Card + transfer + 30/60-day terms |
| Ordering | Simple cart | Quick order, reorder, quotes |
| Catalogue | Public | Restricted by customer rights |
| Integration | Optional | ERP/accounting nearly mandatory |
What exactly you are paying for
The budget splits between the technical core and business modules. Here is a 2026 order-of-magnitude estimate for a complete platform.
| Module | 2026 cost (EUR excl. VAT) | Timeline |
|---|---|---|
| Core + catalogue + accounts | 12,000 – 20,000 | 4-6 wks |
| Per-customer pricing grids | 6,000 – 12,000 | 2-3 wks |
| Quick order / reorder | 4,000 – 8,000 | 1-2 wks |
| ERP integration (stock, prices) | 8,000 – 20,000 | 3-5 wks |
| Card + transfer + terms payment | 3,000 – 7,000 | 1-2 wks |
| Support portal / history | 4,000 – 10,000 | 2-3 wks |
| Complete platform total | 37,000 – 77,000 | 12-20 wks |
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Mini case study
Marc, sales director of an industrial-supplies distributor in Lille, has 220 reseller customers. His 4 reps each spend 2 h a day entering phone and e-mail orders, i.e. 8 h/day total. A B2B platform at 52,000 EUR excl. VAT shifts 60% of those orders to self-service. Gain: 4.8 h/day freed, about 1,000 h/year redeployed to prospecting. At a loaded cost of 45 EUR/h, that is 45,000 EUR/year of recovered value, paying back the platform in 14 months.
FAQ
Why not just Shopify? Shopify Plus handles basic B2B, but complex pricing grids, in-house ERP and approval workflows quickly hit its limits. Above roughly 200,000 EUR of online revenue, custom is often more cost-effective over 3 years.
How much is ERP integration? Budget 8,000 to 20,000 EUR excl. VAT depending on ERP age and API availability. An ERP without a modern API can add 30% to integration costs.
Realistic timeline? 12 to 20 weeks for a complete platform. An MVP (catalogue + customer pricing + ordering) can ship in 8 weeks to validate adoption.
Is there a monthly fee? Plan for maintenance, hosting and evolutions: an order of magnitude of 800 to 2,500 EUR excl. VAT/month depending on traffic and service level.
Let's scope your project. Tell us about your catalogue, ERP and number of pro customers: we will scope the priority modules and an indicative budget. 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.
