B2B E-commerce Platform Cost (Custom) in London (2026)

The verdict in three sentences

A custom B2B e-commerce platform in 2026 costs between 40,000 and 120,000 EUR, far above a B2C site because the complexity lives in customer-specific pricing, credit terms and ERP integration, not in the catalogue. Retrofitting a B2C theme looks cheaper but hides costs the moment you need negotiated price lists, multi-user accounts and payment on account. The real question is not "what does the site cost" but "how many phone orders and keying errors it removes".

Dedicated B2B vs B2C retrofit: what each budget buys

A wholesaler's commercial director usually compares two routes: bolt features onto an existing B2C store, or fund a platform built for trade. Here is the 2026 order of magnitude.

The left column is tempting on price, but every "absent" line comes back as bespoke development billed as you go.

Breaking down a 75,000 EUR budget

On a median project, the 2026 split typically looks like this.

ERP integration and the pricing engine alone weigh half the budget: that is where value sits, and where low-cost quotes lie by omission.

Mini case study

Mark, commercial director of an industrial supplies wholesaler in London, handles 320 orders/month, 70% by phone. Each order takes about 12 minutes of sales-admin time, i.e. 768 hours/year. By shifting 60% of volume to a 75,000 EUR B2B platform, he frees roughly 460 admin hours/year (~13,800 EUR of cost) and cuts keying errors from 5% to under 1%. With an average B2B basket of 340 EUR and faster reordering, the rise in online orders pays back the project in 14 to 18 months.

FAQ

Why does a B2B platform cost more than a B2C site? Because the complexity is invisible: per-customer pricing, credit terms, order approval, ERP integration. These blocks are 50-60% of the budget yet do not exist in B2C.

Can we start with a smaller budget? Yes, a first scope at 40,000-50,000 EUR covers catalogue, per-account pricing and quick order, then you add ERP and credit terms in phase 2. Healthier than a hacked B2C.

How long to launch? Expect 4 to 8 months depending on how clean the ERP data is. A poorly structured catalogue can add 4-6 weeks in data migration alone.

Is payment on account really necessary? In B2B, 30- or 60-day terms are the commercial norm: without them, some customers will never order online. It is ERP-driven to respect credit limits.

What ROI to expect? A wholesaler shifting 50-60% of orders online typically recovers the investment in 12 to 24 months through lower admin cost and higher order frequency.

Let's scope your project. Tell us your order volume, your ERP and your pricing rules and we will scope a costed phase (phase 1 at 40,000-75,000 EUR). Detailed quote within 48 h. WhatsApp +221 77 596 93 33.