The verdict in three sentences
For a London industrial supplies distributor with 4,000 trade customers, a B2B customer portal connected to the ERP costs between 26,000 and 52,000 GBP in 2026 (about 30,000 to 60,000 EUR). Customers find their PDF invoices, delivery tracking and negotiated prices on their own, which removes a large share of the 300 daily customer service calls. With 40 % fewer calls, the business frees around 1.5 FTE for sales and recovers the investment in under twelve months.
What a B2B portal contains and what each block costs
The budget depends mostly on how deep the ERP integration goes. A read-only portal (invoices, orders) stays around 26,000 GBP. Ordering with negotiated prices, volume discounts and carriage-paid thresholds pushes towards 52,000 GBP.
| Module | Function | Indicative cost | Effort in days |
|---|---|---|---|
| Authentication and multi-user accounts | One company account, several buyers, role-based rights | 2,600 to 4,300 GBP | 6 to 10 |
| Order history and PDF invoices | View, download, statement of account | 4,300 to 7,800 GBP | 10 to 18 |
| Carrier tracking (DPD, DHL, Royal Mail) | Real-time status via API or EDI | 3,500 to 7,000 GBP | 8 to 16 |
| Catalogue with negotiated prices | Customer pricing, volume discounts, payment terms | 6,000 to 12,000 GBP | 14 to 28 |
| Online ordering and quick reorder | Basket, CSV import, one-click reorder | 4,300 to 8,700 GBP | 10 to 20 |
| ERP connector | Sync of customers, items, stock, invoices | 5,200 to 12,000 GBP | 12 to 28 |
Then budget 12 to 18 % of the initial cost per year for hosting, corrective maintenance and minor changes.
Connecting Sage, Dynamics or NetSuite: the real gaps
The ERP connector is often the main project risk. Cost gaps come from the quality of available APIs and the data freshness you expect.
| ERP | Usual integration mode | Connector cost | Data freshness |
|---|---|---|---|
| Sage 200 | REST API + SQL views | 5,500 to 9,500 GBP | 15 min |
| Microsoft Dynamics 365 Business Central | OData REST API | 6,000 to 10,500 GBP | 5 min |
| Oracle NetSuite | SuiteTalk REST + SuiteScript | 7,000 to 12,000 GBP | 5 min |
| Odoo | Native XML-RPC or JSON-RPC API | 3,500 to 6,000 GBP | Real time |
| SAP Business One | Service Layer REST | 7,800 to 13,000 GBP | 5 min |
| Legacy or in-house ERP | CSV exports over SFTP | 4,300 to 7,800 GBP | Hourly or nightly |
Ask for a two-day technical workshop before the fixed quote: it prevents surprises on specific fields (discount terms, multiple billing accounts, credit notes).
Measuring return on investment
A portal is managed with a few indicators tracked from month one. The values below are 2026 orders of magnitude seen at distributors with 20 to 150 million GBP turnover.
| Indicator | Before portal | After 6 months | Change |
|---|---|---|---|
| Daily customer service calls | 300 | 180 | - 40 % |
| Invoice copy requests | 45 per day | 8 per day | - 82 % |
| Average response time on tracking | 4 h | Instant | - 100 % |
| Share of orders placed online | 5 % | 30 to 35 % | + 25 to 30 points |
| Order entry errors | 2.5 % | 0.6 % | - 76 % |
| Average debtor days | 58 days | 51 days | - 7 days |
The drop in debtor days comes from the always-available statement: customer accounts teams can no longer claim a missing invoice.
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Mini case study
James, sales director at an industrial supplies distributor in Park Royal, London, runs a customer service team taking 300 calls a day over 220 working days, or 66,000 calls a year at 5.5 min on average including wrap-up: 6,050 hours. With 40 % fewer calls, the team recovers 2,420 hours, or 1.5 FTE on a 1,650 h basis. At 42,000 GBP fully loaded cost per role, the value freed reaches 63,000 GBP a year. The portal costs 41,000 GBP plus 6,150 GBP of yearly maintenance: the net gain of 56,850 GBP a year pays back the investment in about 9 months, before counting extra sales from the two inside sales staff redeployed.
FAQ
What budget should we plan for a B2B customer portal in 2026?
Between 26,000 and 52,000 GBP for a mid-sized distributor, depending on ERP integration depth and whether online ordering is included. Maintenance runs at 12 to 18 % a year.
How long does it take to launch the portal?
Plan 3 to 5 months, including 3 to 4 weeks of scoping and ERP workshop. A pilot with 100 customers lets you fix issues before opening to all 4,000 accounts.
Off-the-shelf or custom build?
SaaS portal solutions start around 700 to 1,700 GBP a month but handle complex negotiated pricing poorly. Above 1,000 active customers, custom often becomes cheaper over 3 years.
Do trade customers really use a portal?
Yes if access is simple and content reliable: 50 to 70 % of active accounts log in within 6 months. Sending credentials with every invoice speeds adoption.
Is the portal UK GDPR compliant?
It mainly processes company data, but buyer contacts are personal data. UK or EU hosting, access logs and a defined retention period should be in the quote.
Let's scope your project. Tell us your ERP, number of active customers and customer service call volume: we will price a portal between 26,000 and 52,000 GBP with a 3 to 5 month schedule. 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.
