The verdict in three sentences
A solid B2B dealer extranet ranges from 35,000 to 90,000 EUR in 2026, driven by the number of roles, the granularity of per-dealer pricing and the depth of ERP integration. Expect a 4 to 7 month project and 1,000 to 2,500 EUR/month in maintenance. A 35,000 EUR MVP (ordering + catalogue + pricing) delivered in 4 months already creates value: additional modules are then added by priority.
What a dealer extranet really costs
The price mostly depends on business-rule complexity: a single price per product is cheap, whereas negotiated per-dealer pricing with discount tiers and temporary promotions requires serious modelling. Here are 2026 ranges per module (order of magnitude, London agency).
| Module | Range EUR | Timeline |
|---|---|---|
| Authentication + roles and permissions | 4,000 - 8,000 | 2-3 wks |
| Product catalogue + product sheets | 5,000 - 10,000 | 3-4 wks |
| Per-dealer personalised pricing | 6,000 - 14,000 | 4-6 wks |
| Order capture + B2B cart | 7,000 - 15,000 | 4-6 wks |
| Document area (invoices, spec sheets) | 3,000 - 7,000 | 2-3 wks |
| ERP integration (SAP, Sage, Cegid) | 5,000 - 15,000 | 4-8 wks |
| Dashboard + reporting | 4,000 - 9,000 | 3-4 wks |
A complete project adds up 6 to 8 of these items, hence the upper range. The big variable is the ERP: a documented REST API costs 5,000 EUR, a legacy system with no API forces connectors around 15,000 EUR.
MVP vs full platform: getting the phasing right
There is no need to ship everything at once. Phasing reduces risk and spreads the cash outlay.
| Phase | Scope | Budget EUR | Timeline |
|---|---|---|---|
| Phase 1 (MVP) | Auth, catalogue, base pricing, orders | 30,000 - 40,000 | 4 months |
| Phase 2 | ERP integration, documents, notifications | 15,000 - 25,000 | 2-3 months |
| Phase 3 | Advanced reporting, promos, mobile app | 15,000 - 25,000 | 2-3 months |
| Maintenance | Hosting, fixes, enhancements | 1,000 - 2,500/month | ongoing |
Phase 1 puts your dealers in self-service ordering by month 4: that is where you save the most order-desk keying hours.
Mini case study
Mark, network director of an electrical-supplies wholesaler in London, manages 48 dealers who order by email and phone. His order desk handles 1,400 orders/month, with 8% keying errors to fix. A 52,000 EUR extranet (MVP + ERP) automates order capture. By removing 3,000 hours of annual re-keying (2 part-time FTEs at 32,000 EUR loaded) and cutting errors from 8% to 1.5%, he saves about 41,000 EUR/year. Payback in 16 months, excluding the commercial upside of a 24/7 available catalogue.
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FAQ
How much is ERP integration alone?
Between 5,000 and 15,000 EUR in 2026. A modern ERP with a REST API (Sage X3, Cegid) lands around 5,000-8,000 EUR; a legacy system without an API climbs to 12,000-15,000 EUR in connectors.
How long until a first usable extranet?
An ordering + catalogue + pricing MVP ships in 4 months. The full platform with ERP, documents and reporting takes 6 to 7 months.
Can we set different prices per dealer?
Yes, it is a dedicated module (6,000 to 14,000 EUR). It handles negotiated prices, volume discount tiers and temporary promotions per customer group.
What maintenance budget should we plan?
Expect 1,000 to 2,500 EUR/month: secure hosting, fixes, monitoring and small enhancements. That is roughly 12-18% of build cost per year, a standard ratio for a line-of-business app.
Do dealers need a mobile app?
Not at first. A responsive extranet is enough in Phase 1. A native app (PWA or store) is added in Phase 3 for 15,000 to 25,000 EUR, once field ordering justifies it.
Let's scope your project. Tell us your dealer count, your ERP and your pricing rules, and we will frame an MVP from 35,000 EUR and its phasing. 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.
