The verdict in three sentences
A B2B e-commerce platform in London in 2026 runs between EUR 30,000 and 90,000, the spread driven mostly by per-customer pricing and ERP integration. Expect 4 to 8 months from scoping to production, with the heavy lifting being pricing, credit and multi-user account logic, not design. The ROI comes from moving orders to self-service: each manually handled order costs EUR 8 to 15 in sales-rep time, which the portal brings below EUR 2.
What the budget covers
A B2B store is not a consumer shop with a "pro" filter. It has to handle per-customer negotiated prices, volume discounts, accounts with several buyers, purchase orders and often credit terms (net 30 or 60). This business logic is what drives the price.
| Item | Share of budget | 2026 ballpark (EUR) |
|---|---|---|
| Scoping, UX, specifications | 12% | 4,000 - 11,000 |
| Catalogue + per-customer pricing engine | 26% | 8,000 - 23,000 |
| Multi-user pro accounts + roles | 16% | 5,000 - 14,000 |
| Cart, quotes, credit, purchase orders | 18% | 5,500 - 16,000 |
| ERP / stock / accounting integration | 20% | 6,000 - 18,000 |
| Testing, training, go-live | 8% | 2,500 - 8,000 |
A platform at EUR 35,000 covers a solid catalogue, customer accounts and daily ERP sync. At EUR 80,000 you get fine-grained negotiated pricing, real-time credit, client-side internal approval workflows and two-way ERP connections.
The three platform tiers
| Tier | Key features | 2026 price (EUR) | Timeline |
|---|---|---|---|
| Re-ordering portal | Catalogue, per-customer prices, quick re-order | 30,000 - 45,000 | 4 - 5 months |
| Sales platform | + online quotes, credit, multi-user | 45,000 - 70,000 | 5 - 7 months |
| Integrated platform | + two-way ERP, internal approval, BI | 70,000 - 90,000+ | 6 - 8 months |
Annual maintenance is 15 to 20% of the build cost: budget EUR 5,000 to 16,000 per year for hosting, security updates, support and pricing-engine changes.
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Mini case study
Mark, sales director of an industrial-supplies distributor in London, manages 320 pro customers. His team of 4 reps keys in 2,100 orders a month received by phone and email, at EUR 11 of processing time each, or EUR 23,100 a month. He invests EUR 58,000 in a sales platform. Six months after launch, 64% of orders go self-service: processing cost drops to EUR 4 for those. Monthly saving: 2,100 x 64% x (11 - 4) = EUR 9,408. The investment pays back in a little over 6 months, and his reps spend their time on key accounts rather than data entry.
FAQ
Why is it pricier than a consumer store? Because the core is invisible: per-customer pricing engine, credit, multi-buyer accounts, ERP link. A EUR 12,000 B2C store has none of these, and they alone make up 50 to 60% of a B2B budget.
Can we keep our current ERP? Yes, in 95% of cases. The platform syncs via API or exports: products, stock and prices flow down, orders flow up. Budget EUR 6,000 to 18,000 depending on whether the ERP exposes a modern API or needs file-based exchange.
How long until go-live? 4 to 8 months. The catalogue and pricing engine take longest: plan 3 to 5 weeks just to clean and structure your product and price data before any development.
Do we charge customers per use? No, the B2B model rests on value for you, not a customer subscription. Your customers order for free; your gain comes from lower processing cost and extra orders outside sales hours.
What sales uplift is realistic? 2026 feedback shows +8 to +18% revenue in year one, mostly from orders placed evenings and weekends, plus automatic re-ordering that cuts stockouts on the customer side.
Let's scope your project. Tell us your number of pro customers, your ERP and whether you need credit terms: we'll quote a portal between EUR 30,000 and 90,000. 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.