The verdict in three sentences
A B2B e-commerce platform for an office supplies distributor in London costs GBP 60,000 to 120,000 custom-built, or about USD 2,300 a month on Shopify Plus B2B before customisation. The truly critical item is the ERP connector (GBP 7,000 to 18,000), which keeps negotiated prices, stock and invoices accurate. Plan 4 to 6 months, with returns driven by moving phone orders to self-service.
What business buyers expect in 2026
Take a London distributor with 45 staff, 1,800 business customers across Greater London and the South East, and 12,000 SKUs of stationery, consumables, furniture and hygiene products. The average B2B basket is GBP 240 ex VAT, and 35% of orders still arrive by phone or email, re-keyed by 4 sales assistants. Key accounts demand contract prices, per-department budgets and an approval step before dispatch.
| B2B feature | Standard B2C site | B2B platform | Customer impact |
|---|---|---|---|
| Negotiated prices per account | No | Yes, synced with ERP | No more invoice disputes |
| Multi-user accounts | No | Buyers, approvers, admin | Spend control |
| Per-department budgets | No | Monthly cap per cost centre | Annual budgets respected |
| Order approval | No | 1 to 3 level workflow | Procurement compliance |
| 30-day payment terms | No | Yes, credit limit enforced | B2B habits respected |
| Quick order by SKU or CSV | No | Yes | 2 minutes instead of 15 |
| Downloadable invoices and delivery notes | Rarely | Yes | Fewer support calls |
2026 price grid: London vs Nantes
2026 ballpark, excluding existing ERP licences:
| Option | London initial cost | Nantes initial cost | Annual cost | Timeline |
|---|---|---|---|---|
| Shopify Plus B2B + apps | GBP 15,000 to 35,000 | EUR 15,000 to 35,000 | About USD 27,600 (2,300/month) + apps | 2 to 3 months |
| Open source platform (Sylius, Magento) | GBP 55,000 to 85,000 | EUR 50,000 to 80,000 | GBP 8,000 to 15,000 | 4 to 5 months |
| Custom Next.js + API | GBP 80,000 to 120,000 | EUR 70,000 to 110,000 | GBP 10,000 to 18,000 | 5 to 6 months |
| ERP connector (Sage, NetSuite, Odoo) | GBP 7,000 to 18,000 | EUR 8,000 to 20,000 | GBP 1,500 to 4,000 | Included |
| Import and enrichment of 12,000 SKUs | GBP 6,000 to 12,000 | EUR 6,000 to 12,000 | One-off | 4 to 8 weeks |
| Advanced search (Algolia, Meilisearch) | GBP 2,000 to 5,000 | EUR 2,000 to 5,000 | GBP 1,000 to 5,000 | 2 weeks |
Search is often underestimated: on a 12,000 SKU catalogue, a buyer who cannot find recycled A4 80gsm paper in 2 tries picks up the phone.
The phone-to-web calculation
An order keyed in by an assistant takes 12 minutes on average, versus zero re-keying online. With 1,800 customers ordering twice a month on average, the distributor handles 3,600 monthly orders, 1,260 of them by phone or email. Moving 70% of those online frees 176 hours a month, roughly one full-time role redeployed to prospecting.
Mini case study
Oliver, managing director of the London distributor, picks an open source platform at GBP 72,000 plus GBP 13,000 for the NetSuite connector, GBP 85,000 in total, and GBP 13,000 a year of maintenance. Estimated annual gains: 176 hours a month at a loaded GBP 30, or GBP 63,400, plus a basket rising from GBP 240 to 257 thanks to related product suggestions: 3,600 orders x 12 months x GBP 17 x 22% margin = up to GBP 161,600 of extra gross margin. Counting only half of that second gain to stay prudent, payback comes about 8 months after launch.
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FAQ
Is Shopify Plus B2B enough for an office supplies distributor?
Yes if you have fewer than 3 price lists and no multi-level approval. Beyond that, the required apps add GBP 2,500 to 7,000 a year and customisation limits.
How long does the ERP connection take?
Plan 6 to 10 weeks for prices, stock, credit limits and invoices. Data quality in the ERP is the main source of delay.
Should we keep phone ordering?
Yes, for 12 to 18 months. A realistic target is to move from 65% to 85% of orders online, with hands-on support for the 200 largest accounts.
Does the platform handle e-invoicing?
UK e-invoicing is moving towards a mandate announced for 2029, and French customers must receive e-invoices from September 2026. Budget GBP 2,500 to 5,000 of integration if the ERP does not already cover it.
Can we launch in phases?
Yes: a 4-month first release with catalogue, negotiated prices and quick order, then budgets and approvals in phase 2 for GBP 13,000 to 22,000.
Let's scope your project. Send us your SKU count, ERP and pricing rules, and we will price a B2B platform between GBP 60,000 and 120,000, delivered in 4 to 6 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.
