The verdict in three sentences
A B2B e-commerce platform for a wholesaler in London costs between 30,000 and 80,000 EUR in 2026, depending on the complexity of negotiated pricing and ERP integration. The budget concentrates on three blocks: per-customer pricing, fast reordering (reorder from a SKU or an uploaded file) and stock/price sync with your back-office system. Plan for 4 to 7 months of delivery and roughly 600 EUR/month in support to keep the platform healthy.
What a B2B wholesale platform really costs
In B2B, the price gap comes from pricing logic: each reseller has its own terms, volume discounts and sometimes an authorised product list. Here are 2026 orders of magnitude for the UK/EU market.
| Line item | 2026 range (EUR) | What it covers |
|---|---|---|
| Discovery + B2B UX design | 4,000 - 9,000 | Pro buyer journey, mockups, specs |
| Catalogue + tech sheets | 5,000 - 12,000 | Product import, variants, sales units |
| Per-customer pricing engine | 6,000 - 16,000 | Price lists, volume discounts, contracts |
| Fast order + reorder | 3,000 - 8,000 | SKU entry, CSV upload, saved baskets |
| ERP/stock connector | 7,000 - 20,000 | Sync prices, stock, orders, customers |
| QA + go-live | 3,000 - 7,000 | Testing, data migration, training |
| Project total | 30,000 - 80,000 | Operational B2B platform |
The two line items that drive the bill up are the per-customer pricing engine and the ERP connector. A wholesaler with 300 customers on different terms and a proprietary ERP lands at the top of the range.
B2B SaaS or custom build?
The core 2026 question: start from a market solution (Sana Commerce, Adobe Commerce B2B, Shopify Plus) or build a custom platform. Cost comparison over a 3-year horizon.
| Option | Upfront (EUR) | Subscription/licence | Estimated 3-year cost |
|---|---|---|---|
| Open-source + B2B modules | 25,000 - 45,000 | 200 - 500 EUR/mo | 32,000 - 63,000 |
| Shopify Plus B2B | 20,000 - 40,000 | 2,000 - 5,000 EUR/mo | 92,000 - 220,000 |
| Sana Commerce (ERP-native) | 30,000 - 60,000 | 1,500 - 3,500 EUR/mo | 84,000 - 186,000 |
| Custom (Next.js + ERP) | 40,000 - 80,000 | 600 EUR/mo support | 61,600 - 101,600 |
SaaS is cheaper to enter but the subscription weighs heavily over 3 years as volume grows. Custom pays off when you have specific business rules and a central ERP.
Mini case study
James runs a catering-supplies wholesaler in London: 220 resellers, a Sage ERP, roughly 400 orders a week placed by phone and email. Processing ties up 2 full-time staff. He invests 52,000 EUR in a custom platform with per-customer pricing and fast reordering, plus 600 EUR/month support. Result: 65% of orders move online within 8 months, the sales-admin team frees up about 1.2 FTE (~42,000 EUR/year loaded). The platform pays back in under 18 months, before counting fewer data-entry errors.
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FAQ
How much does per-customer negotiated pricing cost?
It is the most variable line: 6,000 to 16,000 EUR depending on the number of price lists and rules. An engine handling volume discounts + contracts + authorised products sits at the top.
Can you connect my Sage or NetSuite ERP?
Yes. A two-way connector (prices, stock, orders) costs 7,000 to 20,000 EUR. The price depends on whether a standard API exists or an export must be built.
How long until go-live?
Between 4 and 7 months for a full wholesale platform. An MVP with catalogue + fast order can ship in 3 months, with ERP integration following.
Do we need online payment in B2B?
Often not at first: many wholesalers keep invoice payment at 30-60 days. Card or bank transfer is added when the need appears.
How much is annual maintenance?
Budget roughly 7,200 EUR/year (600 EUR/month) for support, hosting and minor changes. Major features are quoted separately.
Let's scope your project. Tell us your reseller count, your ERP and your order volume, and we will propose a costed scope between 30,000 and 80,000 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.
