The verdict in three sentences
With 180 trucks a day and waits of 2 to 4 hours, a 40,000 m² warehouse near Amsterdam pays detention fees of EUR 40 to 60 per hour every week and saturates its docks at the same peak slots. A custom dock appointment scheduling app, connected to the WMS and to number plate recognition, costs roughly EUR 40,000 to 95,000 excl. VAT in 2026 and often pays back in under 18 months. The real work is not the booking screen but the business rules: unloading time per goods type, reefer priorities, lateness tolerance and WMS integration.
What a truck queue really costs
The warehouse manager sees the queue in the yard, the controller sees it in carrier invoices. Carrier terms and negotiated contracts increasingly bill detention beyond a 2 hour free window. On a site fed by container shuttles from Rotterdam and road flows from Germany and Belgium, the bill climbs fast.
| Item | 2026 assumption | Estimated annual cost |
|---|---|---|
| Trucks exceeding free time | 35 per day out of 180 | calculation base |
| Average billable wait | 1.5 hours beyond free time | 52 hours per day |
| Average hourly fee | EUR 50 per hour | EUR 2,600 per day |
| Working days | 250 days | EUR 650,000 per year |
| Forklift overtime (peaks) | 6 hours per day at EUR 32 loaded | EUR 48,000 per year |
| Disputes and refused deliveries | 3 per week at EUR 400 | EUR 62,400 per year |
Even with a cautious assumption divided by three, you remain above EUR 250,000 per year of avoidable costs. That is the number to put against the software budget.
Functional scope and budget
A serious dock appointment app combines a carrier portal, a capacity engine and connectors. Here is the split we recommend for a first release.
| Module | Content | Indicative budget excl. VAT |
|---|---|---|
| Carrier portal | Account per carrier, slot booking, order number, SMS reminder | EUR 9,000 to 18,000 |
| Capacity engine | Docks by type (reefer, dry, bulk), time per pallet, lateness tolerance | EUR 10,000 to 22,000 |
| WMS integration | ASN reading, receipt creation, real time dock status | EUR 8,000 to 25,000 |
| Number plate recognition (ANPR) | Gate cameras, match with appointment, barrier opening | EUR 6,000 to 15,000 excl. hardware |
| Operations dashboard | Dock occupancy, delays, turnaround per carrier | EUR 4,000 to 9,000 |
| Multilingual NL, EN, DE | Carrier and driver interface | EUR 3,000 to 6,000 |
Total: EUR 40,000 to 95,000 excl. VAT depending on WMS integration depth and number of docks. At Kolonell, a custom application ranges from 2.5 to 15M+ FCFA (EUR 3,810 to 22,870+) depending on complexity for a focused first release, the rest quoted after a scoping workshop. Realistic timeline: 3 to 4 months, including 3 weeks of testing with 5 pilot carriers.
Custom build or off the shelf?
Dock scheduling SaaS tools generally charge EUR 300 to 1,200 per month per site, plus a setup fee. They fit if your WMS has a standard connector. Custom wins when your rules are specific: priority for retail distribution runs, fixed slots for port shuttles, mixed docks or customs constraints on bonded flows.
| Criterion | Off the shelf SaaS | Custom build |
|---|---|---|
| Year 1 cost | EUR 8,000 to 20,000 | EUR 40,000 to 95,000 |
| Years 2 to 5 cost | EUR 4,000 to 15,000 per year | EUR 6,000 to 12,000 per year maintenance |
| Specific WMS integration | Limited or billed extra | Native |
| Business capacity rules | Standard settings | Unlimited |
| Code and data ownership | No | Yes |
Mini case study
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Thomas, manager of a 40,000 m² warehouse in Schiphol Logistics Park, measures EUR 650,000 of theoretical detention per year and actually pays EUR 210,000 after negotiation. He invests EUR 78,000 excl. VAT in an app connected to his WMS and two ANPR cameras, plus EUR 9,000 per year of maintenance. After 4 months of operation, 82% of trucks arrive on appointment and average waiting time drops to 35 minutes. Detention falls by 70%, saving EUR 147,000 per year: the investment pays back in just over 6 months.
FAQ
Will carriers really book?
Yes if booking takes under 2 minutes and trucks without appointments are served last. On our logistics projects, adoption exceeds 75% within 8 weeks once the rule is announced in writing.
Do we need to change WMS?
No. The app reads shipping notices and pushes receipts by API or files. File based integration costs EUR 8,000 to 12,000, real time API integration EUR 15,000 to 25,000.
What happens to late trucks?
The engine applies a configurable tolerance, often 30 minutes, then reassigns the slot. The driver receives an SMS with the next free slot.
How much does plate recognition cost?
Count EUR 2,500 to 5,000 per installed camera, plus EUR 6,000 to 15,000 of development for automatic matching. It removes about 4 minutes of gate checks per truck.
What timeline for a first site?
Between 3 and 4 months, scoping included. A second site reuses 70% of the code and goes live in 4 to 6 weeks.
Let's scope your project. We scope your dock appointment app: number of docks, WMS connector, plate recognition, indicative budget and a 3 to 4 month plan. 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.
