Multi-Client Warehouse Wave Picking Software Cost in Dublin (2026)

The verdict in three sentences

For a multi-client warehouse of 30,000 m² mixing e-commerce and B2B flows, a custom WMS pays off once client-specific picking rules cost more to work around than to build. The 2026 ballpark around Dublin is EUR 90,000 to 200,000 excluding VAT for a full build, against EUR 1,500 to 6,000 per month for SaaS, plus an integration bill that is routinely underestimated. The real financial lever is wave picking, which delivers 15 to 30% more lines per hour when waves are aligned with carrier cut-off times, including the UK-bound trailers.

Why off-the-shelf WMS struggles with multi-client and post-Brexit flows

A 3PL in Ballycoolin or near Dublin Port rarely runs a single flow model. The fashion client wants single-unit parcels with 48-hour returns, the B2B client wants full pallets with GS1 labels, the cosmetics client requires FEFO by batch. Since Brexit, UK-bound orders also need customs data per line: commodity codes, origin, values for the declaration and ENS filings. Standard WMS products can handle each case, but their multi-client configuration becomes a stack of rules only the vendor can maintain, and each new client triggers change requests billed at EUR 800 to 1,200 per day.

The three recurring friction points:

• location management shared between clients, with dedicated and pooled zones;
• wave release that respects each carrier's cut-off (An Post, DPD Ireland, UK groupage via Holyhead or Dublin Port);
• 3PL billing per client, per location, per picked line or per parcel, which few WMS compute cleanly.

Options compared in 2026

These are 2026 ballpark figures for the Irish and wider EU market, hardware excluded. SaaS remains hard to beat below 10,000 m² or with two or three clients sharing similar flows. Above that, integration costs and manual workarounds end up exceeding the subscription.

Hardware and modules to budget

Wave picking groups orders by carrier, zone and cut-off. Well tuned, it cuts walking distance by 30 to 50%, which explains most of the 15 to 30% gain in lines picked per hour.

Mini case study

Aoife, general manager of a 30,000 m² multi-client warehouse in north Dublin, runs 42 pickers for 11 clients at 95 lines per hour on average, with 35% of volume shipped to Great Britain.

• Loaded cost of a picker: about EUR 40,000 per year, or EUR 1,680,000 for the team.
• A conservative 18% gain from waves lets her absorb client growth without hiring 7 to 8 people, about EUR 300,000 saved per year.
• Chosen budget: EUR 160,000 for the custom WMS, EUR 70,000 for hardware, EUR 20,000 per year for maintenance.
• Payback: EUR 230,000 divided by roughly EUR 280,000 of net annual gain, or about 10 months.

Customs data captured at picking time also reduced UK shipments held at the border, a benefit not counted in the initial business case.

How a 6 to 10 month project runs

The project opens with two to three weeks on the dock: flows per client, timed picks, carrier cut-offs and the UK customs process. A first release covers receiving, locations and simple picking around month four, then a second release adds waves, billing, EDI and customs interfaces. Cutover happens client by client, never big bang. At Kolonell, this kind of system falls under our custom web applications, priced on quote after a scoping workshop.

FAQ

Is a SaaS WMS enough for 30,000 m² multi-client?

Yes if your clients have similar flows and you accept EUR 1,500 to 6,000 per month. Once each client imposes its own packing or batch rules, manual workarounds often cost more than 2 FTEs a year.

How quickly does wave picking pay off?

Gains show 4 to 8 weeks after the waves module goes live. Warehouses typically measure 15% in the first month, then up to 30% once cut-offs are refined.

Can the WMS handle post-Brexit UK shipments?

Yes, commodity codes, origin and values can be stored per item and pushed to your customs broker, an interface usually within the EUR 8,000 to 25,000 integration line.

Do we own the code?

With a custom build, yes: source code, documentation and hosting access are handed over. Maintenance then runs at 10 to 15% of the initial budget per year, with no per-user fee.

Can we keep our current ERP?

Yes, the WMS exchanges items, orders and stock with the ERP through API or files, typically EUR 8,000 to 25,000 depending on the ERP's quality.

Let's scope your project. Tell us about your clients, flows and carrier cut-offs, and we will scope a WMS delivered in two releases over 6 to 10 months. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.