The verdict in three sentences
A WMS (Warehouse Management System) attacks the two plagues of the warehouse: stock discrepancies and time lost in picking. In 2026, a custom build costs 55,000 to 140,000 EUR over 20-28 weeks, versus a licence at 50-150 EUR per user per month. With location management and barcode scanning, you target stock accuracy above 99 % and picking productivity +20 %.
Custom vs licence: the 2026 maths
A standard WMS covers classic warehouses well. Custom becomes necessary as soon as your flows (cross-docking, batches, expiry dates, third-party logistics) leave the standard frame.
| Criterion | Custom | SaaS licence |
|---|---|---|
| Upfront cost | 55,000 - 140,000 EUR | 0 - 12,000 EUR (setup) |
| Recurring cost | Maintenance ~15 %/yr of build | 50 - 150 EUR/user/month |
| Delay | 20 - 28 weeks | 4 - 10 weeks |
| Cost 15 users / 3 yrs | ~120,000 EUR (build + maint.) | ~81,000 - 120,000 EUR |
| Specific flows (expiry, batches) | Custom | Often limited |
| Code ownership | Yes | No |
Where a WMS creates value
WMS gains are measured in accuracy and picking time. Here are the 2026 orders of magnitude.
| Metric | Without WMS | With WMS |
|---|---|---|
| Stock accuracy | 92 - 96 % | > 99 % |
| Picking productivity | Baseline | +20 % |
| Picking error rate | 1 - 3 % | < 0.5 % |
| Inventory time | Several days | Rolling, continuous |
| New operator training | 2 - 4 weeks | A few days |
Mini case study
Karim is logistics director of a distributor in Marseille: 18 pickers, loaded cost of 2,400 EUR/month each. A custom WMS at 95,000 EUR (maintenance 14,250 EUR/yr) delivers 20 % productivity, equivalent to 3.6 FTE, i.e. ~103,700 EUR/year. Adding fewer picking errors (disputes and returns -40 %, estimated at 18,000 EUR/yr), the gain exceeds 121,000 EUR/year. Net of maintenance, ROI is reached in about 11 months.
FAQ
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What stock accuracy should we target?
A well-deployed WMS with systematic scanning and rolling inventory targets above 99 % in 2026, versus 92-96 % with manual or spreadsheet management.
Is barcode enough or do we need RFID?
Barcode covers most needs and offers the best cost/gain ratio. RFID is justified for very high-value flows or critical unit-level traceability.
How long to deploy a WMS?
20-28 weeks in 2026, with testing and data migration (locations, items) being the most sensitive phases.
Can the WMS connect to ERP or e-commerce?
Yes, via API or EDI: real-time synchronisation of stock, orders and shipments, avoiding overselling and stockouts.
What is the maintenance cost?
Expect around 15 %/year of the build: flow changes, new carriers, location adjustments.
Let's scope your project. Describe your flows, order-line volume and constraints (expiry, batches, multi-client) — we price build, maintenance and ROI. 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.
