The verdict in three sentences
A custom B2B booking platform — rooms, equipment, slots — costs 40,000 to 95,000 EUR in 2026 depending on the complexity of availability rules and payment. The core of the price is the real-time calendar with no double booking and the business rules (lead times, quotas, client-specific pricing). The ROI comes from -30% coordination calls and +15% occupancy rate, which settles the build vs generic SaaS debate the moment you have specific rules.
What a booking platform costs in 2026
The budget follows the sophistication of the rules and payment integration. A simple shared calendar is nothing like invoiced multi-site resource management.
| Scope | 2026 range (EUR excl. VAT) | Timeline | Content |
|---|---|---|---|
| Simple booking | 40,000 - 55,000 | 3-4 months | Calendar, slots, notifications |
| Advanced booking | 55,000 - 75,000 | 4-5 months | + availability rules, quotas |
| Full platform | 75,000 - 95,000 | 5-7 months | + payment, invoicing, multi-site |
| Payment + invoicing | 10,000 - 20,000 | +3-4 weeks | Stripe, credit notes, reminders |
| Annual maintenance | 15% of build | Recurring | Support, changes |
Against a generic booking SaaS, bespoke wins as soon as your rules leave the standard frame or booking must integrate with your invoicing.
| Criterion | Generic booking SaaS | Custom platform |
|---|---|---|
| Cost | 50-300 EUR/month | 40,000-95,000 EUR one-off |
| Complex availability rules | Limited | Unlimited |
| Client-specific pricing | Rare | Native |
| Invoicing/ERP integration | Basic | Bespoke |
| Brand and experience | Standard | 100% yours |
The real-time calendar, heart of the system
The number-one technical challenge is to prevent double booking of the same resource. This requires a transactional lock at confirmation and immediate propagation of availability to all connected users. On top come the business rules: minimum lead time, maximum duration, per-client quotas, maintenance blackout windows. Well modeled, these rules automate arbitration done today over the phone.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Mini case study
Sarah, COO of a services firm in Amsterdam, rents 18 rooms and 40 pieces of equipment to her professional clients. Her team handles requests by phone and email: around 45 hours a week of coordination and a 62% occupancy rate. A platform quoted at 68,000 EUR excl. VAT automates booking. Gain: 13.5 hours recovered per week (~650 h/year at 34 EUR/h = 22,100 EUR/year) and occupancy raised to 71%, i.e. estimated additional revenue of 31,000 EUR/year. Payback within 16 months.
FAQ
Custom build or booking SaaS? If your rules fit a standard tool (fixed slots, one resource), a 50-300 EUR/month SaaS is enough. Once you have per-client pricing, quotas or invoicing integration, bespoke becomes cost-effective.
How are double bookings prevented? Through a transactional lock at confirmation and real-time availability updates. It is the most critical development point and is tested exhaustively.
Can payment and invoicing be integrated? Yes: Stripe for collection, automatic invoice generation and reminders. Count 10,000 to 20,000 EUR for this module depending on your VAT and credit-note rules.
How long to deliver? From 3-4 months for simple booking to 5-7 months for a full multi-site platform with payment. A working MVP can ship in 10 weeks.
Is +15% occupancy realistic? Yes when booking becomes self-service 24/7: slots fill outside office hours. The gain depends on your baseline and latent demand.
Let's scope your project. Describe your resources, availability rules and payment needs: we frame a booking platform with scope and indicative budget. 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.
