The verdict in three sentences
A buying group in London or Amsterdam with 450 members trading with 300 suppliers by email and spreadsheet loses hours of reconciliation every year and, more importantly, part of its year-end retrospective rebates for lack of reliable tracking. A supplier extranet centralizes price list and terms uploads, the supplier onboarding workflow and rebate calculation, with an audit trail you can rely on in a dispute. At Kolonell, this kind of custom application costs 2,500,000 to 7,000,000 FCFA (3,810 to 10,670 EUR) depending on scope, delivered in 3 to 5 months, followed by maintenance at 75,000 to 120,000 FCFA per month (114 to 183 EUR).
What the extranet must cover, module by module
The starting point is the annual negotiation round. Most buying groups agree supplier terms for the calendar year between October and February, and new price lists arrive in every possible format. The extranet enforces one template, timestamps each upload and highlights price changes for buyers. The modules below are ranked by the priority we see in groups for building materials, home and garden, foodservice or office supplies.
| Module | Main use | Complexity | Expected gain |
|---|---|---|---|
| Supplier profile and compliance documents | Company registration (Companies House or KvK extract), insurance, modern slavery statement | Low | No more manual chasing, alerts 30 days before expiry |
| Price list and terms upload | Standard file import, variance checks | Medium | Price increase analysis in 1 day instead of 2 weeks |
| Supplier and product onboarding workflow | Product file, buyer review, committee approval | Medium | Listing time cut by half |
| Annual agreement | Version tracking, e-signature | Medium | Clear view of renewal deadlines |
| Year-end rebate tracking | Tiers, turnover declarations, rebate claims | High | Recovery of forgotten rebates |
| Messaging and announcements | Group to supplier communication | Low | Fewer scattered emails |
| Exports to ERP and members | Net prices, catalogs, terms | Medium | Member prices updated without re-keying |
Compliance documents deserve special attention. In the UK, larger groups must publish a modern slavery statement and check their supply chain, while Dutch groups routinely require a recent KvK extract and proof of insurance. An extranet that flags or blocks suppliers with expired documents protects the group.
Two scopes, two budgets
The right approach is to separate a first release useful within 3 months from a second release that industrializes rebates. Kolonell's custom application grid applies directly, with no per-user license fees.
| Option | Budget | Scope | Timeline |
|---|---|---|---|
| Kolonell, simple application | 2,500,000 to 4,000,000 FCFA (3,810 to 6,100 EUR) | Supplier profiles, compliance documents, price uploads, messaging | 3 months |
| Kolonell, medium application | 4,000,000 to 7,000,000 FCFA (6,100 to 10,670 EUR) | Simple + onboarding workflow, agreements, rebate tracking, ERP exports | 4 to 5 months |
| Kolonell, application maintenance | 75,000 to 120,000 FCFA per month (114 to 183 EUR) | Fixes, minor changes, backups, monitoring | Monthly |
| London agency, same scope | 35,000 to 100,000 GBP | 2026 order of magnitude, support retainer often extra | 5 to 8 months |
| Amsterdam agency, same scope | 40,000 to 110,000 EUR | 2026 order of magnitude | 5 to 8 months |
| Supplier management SaaS | 400 to 2,500 GBP per month | Standard features, weak fit for bespoke rebate rules | 1 to 3 months of setup |
| Specific ERP connector, e-signature | Custom quote | Depends on ERP and signature vendor | Depends on scope |
SaaS is quick to start, but over 5 years, 1,300 GBP a month adds up to 78,000 GBP, several times the budget of a medium application, without control over the group's own rebate rules.
Decisions to settle during scoping
Scoping takes 3 to 4 weeks and answers five questions: who uploads what on the supplier side (one account per sales rep or per company), which price file format is mandatory, how many approval levels the listing committee needs, which tier rules apply to rebates, and which ERP receives net prices. Suppliers adopt the tool if their first upload takes under 20 minutes, so you need a clear file template and short online help. On security, two-factor authentication and access logging are recommended because commercial terms are confidential.
Mini case study
Pieter, finance director of a building materials buying group in Amsterdam, oversees 60 million EUR of annual purchases with 300 suppliers. His team spends about 4 hours per supplier per year reconciling rebates in spreadsheets, or 1,200 hours. With the extranet, that drops to 1 hour: 900 hours saved, worth about 40,500 EUR a year at a loaded cost of 45 EUR per hour.
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Industry audits put unclaimed rebates at roughly 0.3 to 1% of purchases. Taking 0.5% of 60 million EUR, the leak reaches 300,000 EUR. Recovering just 20% of that brings in 60,000 EUR a year. Against a medium application at 9,000 EUR and Premium maintenance at 183 EUR per month (2,196 EUR a year), payback is measured in weeks.
FAQ
Will suppliers actually use the extranet?
Yes, if the group makes uploads mandatory for the next negotiation round and the first upload takes under 20 minutes. In the projects we have seen, 80% of suppliers are active by the second campaign.
Can we start without the rebate module?
Yes, the simple release at 2,500,000 to 4,000,000 FCFA (3,810 to 6,100 EUR) covers compliance and pricing in 3 months. The rebate module is added later without a rebuild because supplier data is already structured.
Where is the data hosted?
The application is hosted in Europe, with daily backups and encrypted documents. The exact hosting provider is chosen during scoping to match your IT policy.
How many users can the extranet handle?
The 300 suppliers, the buyers and 450 members in read-only mode run without difficulty. Cost does not depend on user count, unlike SaaS tools billed at 8 to 35 GBP per account per month.
What does monthly maintenance cover?
The 75,000 FCFA (114 EUR) plan covers fixes, security updates and backups. The 120,000 FCFA (183 EUR) plan adds minor enhancements and closer monitoring during negotiation season.
Let's scope your project. Describe your current supplier workflows and rebate rules, and we will propose a phased plan with a first useful module within 3 months. 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.
