The verdict in three sentences
For an office supplies wholesaler serving 900 businesses in London, a B2B ordering portal costs between 50,000 and 120,000 GBP in 2026, depending on how deeply it integrates with your ERP. The budget is driven by contract pricing logic, the customer-side approval workflow and net 30 credit control, far more than by storefront design. At 2,600 orders a month, a portal adopted by 60 % of customers pays for itself in about eleven to fourteen months.
What a B2B portal costs in London in 2026
The table below breaks down a typical project for a 6,000-SKU catalogue, using 2026 order-of-magnitude ranges seen on the UK market.
| Item | 2026 range (GBP, excl. VAT) | What drives the price |
|---|---|---|
| Discovery and workshops (catalogue, pricing rules) | 4,000 to 8,000 | Number of product families, existing price lists |
| 6,000-SKU catalogue, product pages and search | 8,000 to 18,000 | Quality of the spreadsheet or ERP feed, imagery |
| Customer accounts, contract pricing, discounts | 9,000 to 22,000 | Price lists per customer, group or volume tier |
| Procurement approval workflow | 5,000 to 12,000 | Thresholds, multi-site customers, delegation |
| Net 30 terms, credit limits and dunning | 6,000 to 15,000 | Hard credit stop, automated reminders |
| ERP connector (Sage, NetSuite, Dynamics) | 13,000 to 35,000 | Stock, invoice and credit note sync |
| Testing, training, go-live | 5,000 to 10,000 | Number of internal users to train |
| Total | 50,000 to 120,000 |
On top of the build, plan for hosting and a support retainer, typically 12,000 to 24,000 GBP a year for a portal of this size.
Phone or portal: comparing ordering channels
Many London wholesalers still take orders by phone, email or scanned purchase order. Here is what a portal changes, in 2026 orders of magnitude.
| Criterion | Phone and email | B2B portal |
|---|---|---|
| Order entry time | 8 to 12 minutes | 1 to 2 minutes of checking |
| Wrong-item rate | 3 to 6 % | Under 1 % |
| Availability | Office hours | 24/7, weekends included |
| Price applied | Sales rep's memory | Automatic contract price list |
| Customer procurement approval | Email or signed PO | Built-in workflow with threshold |
| Net 30 credit tracking | Spreadsheet | Real-time hard credit limit |
| Annual processing cost | About 100,000 GBP (3 order clerks, loaded) | About 18,000 GBP (support and hosting) |
The portal does not replace your account managers: it frees their time for new business and key accounts while routine reorders move online.
The features that drive customer adoption
Contract pricing. A buyer at a bank or a law firm in the City must see their negotiated price, not your list price. The portal links each account to a price list (per customer, group or volume tier) and shows any year-end rebates agreed in the contract.
Procurement approval. In a customer company, an office manager builds the basket and the procurement manager approves above a threshold, for example 3,000 GBP. The portal handles these roles, cost centres and multiple delivery addresses (head office in Canary Wharf, a branch in Croydon).
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Net 30 terms. Large accounts pay on invoice at 30 days; the portal tracks the outstanding balance and blocks orders once the credit limit is reached. Smaller customers pay upfront by card or bank transfer. A one-click reorder list and a fast mobile interface complete the picture: these details drive adoption, with a realistic target of 60 % of orders online within twelve months (estimate).
Mini case study
James, sales director of an office supplies wholesaler in Park Royal, handles 2,600 orders a month for 900 businesses. At 10 minutes of entry per order, his team spends about 433 hours a month keying orders.
If 60 % of orders, or 1,560, move to the portal, the business saves about 260 hours a month, equivalent to 1.6 full-time roles at 35,000 GBP loaded, or about 4,700 GBP a month. On those 1,560 orders, the error rate drops from 4 % to 1 %: 47 errors avoided at 60 GBP each in rework and redelivery, or about 2,800 GBP a month.
Total gain: roughly 7,500 GBP a month, or 90,000 GBP a year. For a portal at 85,000 GBP, payback comes around month eleven, before counting the larger basket that one-click reordering brings.
FAQ
How long does it take to launch? Allow 10 to 16 weeks from discovery to go-live. The timeline depends mostly on product data quality: a clean 6,000-SKU file loads in a few days, an incomplete one can take 3 to 4 weeks of clean-up.
Do we need to change our ERP? No. A connector to Sage, NetSuite or Dynamics costs between 13,000 and 35,000 GBP and syncs stock, prices and invoices several times a day.
Which payment options should we offer? Net 30 invoicing with credit limits for key accounts, plus card and bank transfer for the rest. Card fees for UK B2B payments typically sit between 1.2 and 2.5 % depending on card type.
What happens to our sales reps? They keep their accounts and can place orders on behalf of customers through the portal. Their commission stays calculated on their accounts' sales, online included, which avoids internal resistance.
How do we avoid a portal nobody uses? Start with the 20 % of SKUs that generate 80 % of revenue, with full images and descriptions, then onboard your 50 largest customers in 30-minute video calls.
Let's scope your project. Send us your SKU count, number of customers and ERP, and we will scope the build, an indicative budget and a go-live date. 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.