The verdict in three sentences
A B2B extranet for your resellers and partners is budgeted in London in 2026 between 25,000 and 70,000 EUR (excl. VAT), delivered in 12 to 18 weeks. The core of the project is customer-specific pricing and catalogues plus the ERP connector (5,000 to 12,000 EUR). The return comes from autonomy: +30% of orders placed without your sales team.
What a B2B extranet budget funds
A B2B extranet is not a showcase site: it is a transactional platform with roles, negotiated prices and connections to your management system. Here are the tiers seen on the London market.
| Tier | Budget 2026 (excl. VAT) | Typical scope | Timeline |
|---|---|---|---|
| Simple extranet | 25,000 - 35,000 EUR | Catalogue, per-customer pricing, cart | 12-14 wks |
| Standard extranet | 35,000 - 50,000 EUR | + order tracking, multi-level roles | 14-16 wks |
| Advanced extranet | 50,000 - 70,000 EUR | + ERP connector, reporting, workflows | 16-18 wks |
| Complex platform | 70,000 EUR and up | Multi-country, multi-currency, API | 18 wks and up |
2026 order of magnitude for London and its region; some agencies charge 10 to 20% more for enterprise scopes.
The modules that weigh on the quote
Some modules concentrate the complexity and therefore the cost. Framing them early avoids surprises.
| Module | Cost 2026 (excl. VAT) | Impact |
|---|---|---|
| Per-customer pricing and discounts | 4,000 - 9,000 EUR | Loyalty, controlled margins |
| ERP connector (stock, prices) | 5,000 - 12,000 EUR | Real-time data |
| Multi-level roles (HQ/branch) | 3,000 - 7,000 EUR | Delegation, control |
| Reorder / quick restock | 2,500 - 5,000 EUR | Higher average basket |
| Partner reporting | 2,000 - 4,500 EUR | Commercial steering |
| Maintenance | 12% of budget/year | Fixes and evolutions |
Maintenance at 12% of the budget per year is unavoidable on an ERP-connected extranet: on a 50,000 EUR project, budget ~6,000 EUR/year for fixes and connector evolution.
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Mini case study
Sarah, sales director at an electrical supplies wholesaler in London, manages 180 active resellers. Every order currently goes through a salesperson: about 1,400 orders/month, at 8 minutes of entry and price checking each.
She invests 48,000 EUR in a B2B extranet with per-customer pricing and an ERP connector. After deployment, 30% of orders shift to self-service, or 420 orders/month handled without a salesperson. That frees 56 hours/month of sales time, redeployed to prospecting. Valued at 40 EUR/h fully loaded, the saving reaches 26,880 EUR/year. With 5,760 EUR/year maintenance, the extranet pays back in under 2.5 years, and the revenue from faster prospecting shortens that further.
FAQ
Extranet or marketplace: what is the difference? An extranet serves your known partners (resellers, branches) with negotiated pricing. A marketplace opens up to many sellers and buyers with a commission system. The architectures and budgets differ significantly.
Do we have to connect the ERP? No, but without a connector your stock and prices are updated manually, which greatly limits the value. The connector (5,000 to 12,000 EUR) is often the best euro invested to keep real-time orders reliable.
How long for a B2B extranet? Expect 12 to 18 weeks: 3 weeks of framing and role design, 8 to 11 of development, 2 to 3 of testing plus migration of customer and pricing data.
Can we manage several user levels? Yes: a partner can have an HQ account that approves and branch accounts that order within a limit. These multi-level roles cost 3,000 to 7,000 EUR but structure the commercial relationship.
What hosting for a transactional extranet? A managed European cloud with a replicated database and backups, between 120 and 350 EUR/month depending on traffic, guarantees the availability an ordering platform requires.
Let's scope your project. Tell us your number of partners, your ERP and your pricing rules, and we will size a B2B extranet for your network. 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.
