The verdict in three sentences
A custom WMS (Warehouse Management System) for a Dublin wholesaler costs between 45,000 and 120,000 EUR in 2026, versus 200 to 800 EUR/month for a SaaS WMS depending on volume. Custom becomes worthwhile as soon as your locations, picking rules and inventory flows are too specific for an off-the-shelf tool. The main gain: a 40 to 60 % reduction in picking errors thanks to barcode scanning and guided picking.
How much a custom WMS costs in 2026
The price depends on the level of automation: simple location management, or a full suite with optimized picking, cycle counting and ERP integration. 2026 order of magnitude for the Dublin market.
| Scope | Key features | Price EUR | Timeline |
|---|---|---|---|
| Essential WMS | Locations, inbound/outbound, barcode scanning | 45,000 - 62,000 | 5 - 6 months |
| Standard WMS | + Guided picking, cycle counting, replenishment | 65,000 - 95,000 | 6 - 7 months |
| Advanced WMS | + Multi-warehouse, ERP integration, KPI dashboards | 100,000 - 120,000 | 7 - 8 months |
| SaaS WMS (comparison) | Volume-based subscription, fixed features | 200 - 800/month | 3 - 8 weeks |
| Annual maintenance | Enhancements, hosting, support | 15 - 20 % of build | Recurring |
| Scan terminals (hardware) | Industrial scanners / PDAs | 400 - 1,200/unit | One-off |
A SaaS WMS at 600 EUR/month represents 7,200 EUR/year, or 36,000 EUR over 5 years, without ever owning the tool nor being able to model your storage rules.
What custom software saves you
The gains show up in errors, picking speed and stock reliability. Estimate for a mid-sized wholesaler warehouse.
| Lever | Without dedicated WMS | With custom WMS | Estimated gain |
|---|---|---|---|
| Picking errors | 3 - 6 % of lines | 0.5 - 1.5 % | -40 to -60 % |
| Picking time / line | 45 - 70 s | 25 - 40 s | -40 % |
| Stock accuracy | 85 - 92 % | 98 - 99.5 % | Near perfect |
| Annual inventory duration | 2 - 3 days (shutdown) | Cycle count, no stop | -80 % |
| New operator training | 2 - 3 weeks | 3 - 5 days | -70 % |
Mini case study
Sophie manages a wholesaler warehouse in Dublin with 12,000 lines picked per month. Her error rate is 4.5 %, or 540 errors/month. Each error costs an average of 35 EUR (return, re-shipping, credit note), or 18,900 EUR/month. By dropping to 1 % error with a custom WMS, she saves 14,700 EUR/month, or 176,400 EUR/year. On an 80,000 EUR WMS, the payback is about 7 months, before even counting the picking speed gain.
FAQ
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Do we need to replace all our hardware for a WMS?
No. The WMS works with industrial scanners or PDAs (400 to 1,200 EUR per unit). If you already have some, we reuse them; otherwise hardware is added to the project.
Isn't a SaaS WMS enough to start?
For a small single-site warehouse, yes. But as soon as you have specific picking rules, locations or flows, SaaS forces you to bend your operations to the tool.
Does barcode scanning work offline?
Yes. The terminal app caches operations and syncs with the server, avoiding stoppages if the warehouse Wi-Fi drops.
Can the WMS connect to our ERP?
Yes, and it is recommended: synchronization of items, orders and stock. Budget 8,000 to 18,000 EUR for integration depending on the ERP's APIs.
How long to go live?
A first version with locations and scanning ships in 4 to 5 months, then optimized picking and cycle counting are added in iterations.
Let's scope your project. Tell us your line volume, number of locations and your ERP for a precise estimate. 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.
