The verdict in three sentences
A B2B extranet costs between €45,000 (standard) and €180,000 (with catalog, order-taking and ERP synchronization) in 2026. The item that blows up the budget is neither design nor catalog: it's the ERP connector (€12,000-30,000) and fine-grained role/permission management. Plan for 4 to 7 months and 18% of the build per year in maintenance.
2026 price ranges
Benchmarks for a French agency (day rate €550-700). A well-designed partner extranet replaces hundreds of order and pricing-request emails.
| Type | Budget (ex-VAT) | Timeline | Functional core |
|---|---|---|---|
| Standard extranet | €45,000-90,000 | 4-5 months | Accounts, docs, negotiated prices |
| + catalog & ordering | €90,000-130,000 | 5-6 months | + B2B cart, quotes, orders |
| + ERP synchronization | €100,000-180,000 | 6-7 months | + real-time stock, prices, orders |
| Multi-country extranet | €150,000-250,000 | 7-10 months | + multi-currency, multi-language |
Structural cost items
| Item | Cost (ex-VAT) | Timeline | Why it's expensive |
|---|---|---|---|
| Roles & permissions | €6,000-12,000 | 1-2 wks | Buyer/sales/admin matrix |
| Per-client negotiated prices | €5,000-10,000 | 1-2 wks | Specific price grids |
| B2B order-taking | €10,000-20,000 | 3-4 wks | Cart, quotas, approval |
| ERP connector | €12,000-30,000 | 3-6 wks | Stock/price/order sync |
| Partner dashboard | €6,000-12,000 | 1-2 wks | History, balances, docs |
The ERP connector is the investment that transforms the extranet: without it, someone re-keys orders; with it, displayed stock and placed orders are synced in real time with your SAP/Sage/Dynamics.
B2B extranet vs client portal
Two tools often confused. Here's what distinguishes them in scope and budget.
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| Criterion | Client portal | B2B extranet |
|---|---|---|
| Audience | End customers | Partners, distributors, resellers |
| Key function | Documents, invoices, support | Ordering, negotiated prices, stock |
| ERP integration | Optional | Often central |
| Role management | Simple | Complex (multi-level) |
| 2026 budget | €15,000-60,000 | €45,000-180,000 |
| Timeline | 2-4 months | 4-7 months |
Mini case study
Hélène, sales director of an industrial distributor in Bordeaux, manages 220 resellers by phone and email, with different price grids. Choice: extranet with catalog, ordering and ERP sync (Sage). Quote: €135,000, 6.5-month timeline, maintenance €24,300/year (18%). Estimated result: 3 sales reps freed from order entry (~1,800 hrs/year at €40/hr = €72,000), pricing errors cut 4x, and average order +12% thanks to cross-sells suggested online. On €8M of reseller revenue, +12% average order is a major lever: the extranet pays for itself in under a year.
FAQ
What's the concrete difference between an extranet and a B2B e-commerce site? A B2B e-commerce site is open to prospecting; an extranet is reserved for known partners, with negotiated prices, credit balances and specific terms. The extranet is more relationship-driven, and the ERP connector is almost always present.
Is the ERP connector always necessary? No, but without it you manually re-key stock, prices and orders. Once volume exceeds a few dozen orders/week, the connector (€12,000-30,000) quickly pays off in time saved and errors avoided.
Why does role management cost so much? Because a B2B extranet has multiple profiles (buyer, manager, internal sales, admin) with different rights over prices, orders and documents. This permission matrix (€6,000-12,000) is tricky to secure properly.
How much is maintenance? Budget 18% of the build per year, slightly more than a standard app because ERP connectors evolve with your internal systems. On a €135,000 build, that's ~€24,000/year.
How long until it's operational? From 4-5 months for a standard extranet to 6-7 months with ERP synchronization. Scoping the ERP flows (2-3 weeks) heavily determines the timeline.
Let's scope your project. Tell us how many partners you manage, your ERP and whether you want online order-taking, and we'll price the right extranet. 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.
