The verdict in three sentences
A custom multi-warehouse inventory system for a wholesale distributor costs between 20,000 and 80,000 EUR in 2026, delivered in 12 to 22 weeks. The main gain is the end of stockouts: real-time stock with automatic reordering drops the stockout rate by roughly 30 %, and every stockout costs lost margin plus, often, a lost customer. A standard WMS/ERP covers 70 % of the need; custom covers your reorder rules, tiered discounts and real EDI flows.
Standard WMS/ERP vs custom build
Distribution software exists, but it imposes its model. Custom starts from your warehouse setup, supplier lead times and customer agreements.
| Criterion | Standard ERP/WMS | Custom Kolonell |
|---|---|---|
| Upfront cost | 15,000-40,000 EUR + licences | 20,000-80,000 EUR |
| Recurring cost | 200-600 EUR/mo/user | Hosting 80-300 EUR/mo |
| Reorder rules | Standard | Your thresholds, seasonality |
| Tiered discounts | Limited | Custom |
| Client/supplier EDI | Paid module | Integrated |
| Real-time multi-warehouse | Depends on edition | Native |
| Extensibility | Constrained | Full |
Inventory modules and ROI
Each module cuts a hidden cost: stockout, overstock, picking errors, disputes.
| Module | Function | 2026 impact (estimate) |
|---|---|---|
| Real-time multi-warehouse stock | Consolidated view all sites | -30 % stockouts |
| Reorder & dynamic thresholds | Automatic supplier orders | -20 % overstock |
| Preparation & picking | Optimized lists, scanning | -40 % picking errors |
| Client/supplier EDI | Automated orders/invoices | -60 % manual entry |
| Lot/expiry traceability | Recalls, FEFO rotation | -50 % expiry losses |
| Margin dashboard | Margin by product/warehouse | +2 to 4 pts net margin |
For a wholesaler at 8,000,000 EUR revenue, cutting stockouts by 30 % can recover 1.5 to 3 % of lost revenue, i.e. 120,000 to 240,000 EUR, against a 20,000-80,000 EUR project: payback is measured in months.
Mini case study
Claire, CFO of an electrical-supply wholesaler in Lyon (3 warehouses, 6,200,000 EUR revenue), faced a 9 % stockout rate and overstock tying up about 400,000 EUR. After a custom system at 48,000 EUR: real-time stock and dynamic reordering drop stockouts to 6 % (about 1.8 % of revenue recovered, ~112,000 EUR) and free 120,000 EUR of overstock cash. Payback under 6 months, before margin gains from steering.
FAQ
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How much does custom multi-warehouse inventory software cost in 2026?
Between 20,000 and 80,000 EUR depending on warehouse count, EDI and reorder-rule complexity. A 2-4 warehouse project with EDI often lands around 40,000-55,000 EUR.
How long to deploy?
12 to 22 weeks: scoping and product data migration, development, then warehouse-by-warehouse cutover to secure operations.
Can we keep our existing EDI flows?
Yes, client and supplier EDI (orders, dispatch advices, invoices) is in scope and connected to your existing partners.
Does it really reduce stockouts?
Yes: the real-time view plus dynamic threshold reordering typically cut the stockout rate by roughly 30 %, a figure to validate against your history.
Can it connect to our accounting?
Yes, export to accounting (sales, purchases, stock valuation) and invoicing are part of the standard scope.
Let's scope your project. Tell us warehouse count, SKU volume and EDI needs: indicative budget 20,000-80,000 EUR, timeline 12-22 weeks. 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.
