The verdict in three sentences
A B2B e-commerce platform in London costs between 45,000 and 120,000 GBP in 2026, depending on the complexity of per-account pricing, multi-buyer accounts and ERP integration. The realistic timeline runs 4 to 7 months, and you should budget 12% of the build per year for evolutive maintenance. The return shows up fast: +25% of orders placed online and -20% of sales-team workload on manual entry.
What a B2B platform budget covers
A B2B e-commerce site is not a consumer store with a different logo. It handles per-account price lists, payment terms and quotas, quote-to-order workflows, and above all ERP synchronisation for stock, prices and orders. The budget breaks down by functional scope.
| Item | 2026 range (GBP) | Timeline |
|---|---|---|
| Scoping + B2B UX design | 6,000 - 15,000 | 3-5 wks |
| Catalogue + per-account pricing | 10,000 - 26,000 | 5-8 wks |
| Buyer accounts + roles | 5,000 - 13,000 | 3-5 wks |
| Quote / order / reorder | 8,000 - 20,000 | 4-7 wks |
| ERP integration (real-time) | 9,000 - 28,000 | 5-9 wks |
| Testing + go-live | 4,000 - 12,000 | 2-4 wks |
The roles involved explain the price spread. In 2026 London, the day rates seen in agencies and among senior freelancers fall in this range.
| Profile | 2026 day rate (GBP) | Role |
|---|---|---|
| Project manager | 650 - 900 | Scoping, delivery |
| Back-end developer | 600 - 900 | ERP, pricing, API |
| Front-end developer | 550 - 800 | Buyer journey |
| UX/UI designer | 600 - 850 | B2B ergonomics |
| ERP integration expert | 700 - 950 | Real-time flows |
London vs Paris: order of magnitude
For a leader weighing several markets, here is the equivalent 2026 budget comparison (estimate, identical scope).
| Scope | London (GBP) | Paris (EUR excl. VAT) |
|---|---|---|
| Essential B2B platform | 45,000 - 65,000 | 30,000 - 45,000 |
| Platform + ERP + accounts | 70,000 - 95,000 | 50,000 - 70,000 |
| Advanced multi-site platform | 100,000 - 120,000 | 75,000 - 90,000 |
| Annual maintenance | 12-15% / yr | 12% / yr |
London stays 30 to 40% more expensive at equal scope, mostly because of day rates and overheads. Paris offers a competitive value-for-money route for a francophone project aimed at Europe.
Mini case study
Thomas, sales director of an industrial supplies distributor in London (16M GBP revenue, 900 trade customers), has 60% of orders keyed in by phone and email. He invests 65,000 GBP in a B2B platform with per-account pricing and ERP integration, delivered in 5 months.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
His reps spent 18 minutes per order on entry. With 4,200 orders a year moved online, he saves roughly 1,260 hours, or 0.8 FTE reassigned to prospecting. Meanwhile online orders rise 25% thanks to self-service 24/7 reordering. Estimated payback: under 14 months.
FAQ
Why does a B2B platform cost more than a standard e-commerce site?
Because the business logic is heavier: per-account pricing, payment terms, quotas, approval workflows, and above all real-time ERP integration. These blocks often make up 40 to 50% of the budget.
Can we start with a 45,000 GBP budget?
Yes, for an essential version: catalogue, buyer accounts, per-group pricing and online ordering, without complex ERP integration. Real-time flows come in a phase 2 once ROI kicks in.
How long before go-live?
Expect 4 to 7 months depending on ERP complexity. An essential scope can ship in 4 months; a platform connected to an existing ERP and several warehouses needs 6 to 7 months.
What maintenance budget should we plan after launch?
A maintenance retainer of 12% of the build cost per year is a reliable 2026 order of magnitude: fixes, evolutions, security updates and small features. On a 65,000 GBP project, that is about 8,000 GBP per year.
Is the +25% online orders ROI realistic?
It is an average seen among distributors who digitise reordering. The gain comes mainly from customer autonomy (24/7 ordering) and fewer entry errors.
Let's scope your project. Tell us about your catalogue, your ERP and your order volume, and we will price a B2B platform that fits your budget. 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.
