The verdict in three sentences
A custom multi-site booking and scheduling platform costs EUR 40,000 to EUR 95,000 in 2026 and ships in 4 to 6 months. It unifies calendars, collects an online deposit and automates notifications across all your centres. Custom is justified as soon as booking spans multiple sites, resources and specific business rules.
Scope and cost by module
| Module | Content | Cost (2026 estimate) |
|---|---|---|
| Booking engine | Real-time availability, rules | EUR 12,000 - 25,000 |
| Multi-site management | Per-centre views, resources, staff | EUR 8,000 - 20,000 |
| Deposit payment | Stripe, refund, no-show | EUR 5,000 - 12,000 |
| Notifications | Email/SMS, reminders, follow-ups | EUR 4,000 - 9,000 |
| Back-office & reporting | Planning, occupancy rate, exports | EUR 7,000 - 16,000 |
| Testing & rollout | QA, training, go-live | EUR 5,000 - 13,000 |
The core complexity is real-time availability across several sites with shared resources: that's where experience quality is won.
Cost per site
| Number of sites | Build cost (estimate) | Average cost per site |
|---|---|---|
| 3 sites | ~EUR 48,000 | ~EUR 16,000 |
| 5 sites | ~EUR 62,000 | ~EUR 12,400 |
| 8 sites | ~EUR 78,000 | ~EUR 9,750 |
| 12 sites | ~EUR 92,000 | ~EUR 7,700 |
Marginal cost per site drops sharply: the multi-site architecture is shared, making custom all the more relevant as the network grows.
Custom build vs booking SaaS
| Criterion | Booking SaaS (Calendly/Mindbody type) | Custom platform |
|---|---|---|
| Recurring cost | EUR 20 - 60/site/month | Hosting EUR 150-500/month |
| Business rules | Standard | Custom |
| Unified multi-site | Limited | Native |
| Deposit payment | Sometimes via add-on | Integrated |
| Brand & UX | Constrained | Fully controlled |
| Pays off if | 1-4 simple sites | Network, specific rules |
For 8 sites at EUR 45/month, a SaaS costs ~EUR 4,320/year; but the lack of unification and fine rules often costs more in lost slots than in licences.
Mini case study
Marc, director of a 6-site sports club network in Toronto, generates EUR 480,000 in annual revenue. He invests EUR 64,000 in a unified platform with deposit and automatic reminders. No-shows fall and the occupancy rate rises by 18%, lifting revenue to ~EUR 566,000, i.e. +EUR 86,000 per year. The online deposit also secures cash flow. Payback in under 9 months, before administrative time savings.
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FAQ
Why not just stack a SaaS per site?
Because you lose the consolidated view, resource pooling and brand consistency. A customer shouldn't face 6 different systems for one network.
Does an online deposit really cut no-shows?
Yes: a deposit, even 10 to 20%, typically halves or thirds no-shows. It's often the highest-ROI module.
How long to go live?
Expect 4 to 6 months of development, then 2 to 4 weeks of gradual site-by-site rollout to secure adoption.
Can we connect the platform to our accounting?
Yes, via automatic export or API. Plan this integration in the initial scope to avoid double data entry.
What recurring cost after delivery?
Between 15 and 20% of build cost per year for managed hosting, maintenance and evolutions, i.e. ~EUR 10,000 to 13,000 for a EUR 64,000 platform.
Let's scope your project. Tell us your number of sites, booking rules and deposit policy, and we'll price your unified engine. 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.
