The verdict in three sentences
A custom B2B booking platform costs between 30,000 and 90,000 EUR in 2026, the range driven mostly by business-rule complexity (dynamic pricing, quotas, roles, framework contracts). A booking SaaS is enough for simple reservations, but once your prices vary by client, period and volume, custom becomes unavoidable. The ROI shows up in occupancy rate: +15 to +25% and the disappearance of double bookings.
Where the 2026 budget goes
A B2B booking engine comprises an availability calendar, a pricing engine, a checkout flow with payment, and fine-grained role management (buyer, approver, admin). Business rules are the heart - and the cost - of the project.
| Module | Scope | 2026 estimate (EUR) |
|---|---|---|
| Calendar & availability | Resources, slots, conflicts | 6,000 - 14,000 |
| Dynamic pricing engine | Rules, discounts, framework deals | 8,000 - 22,000 |
| Booking flow | Cart, options, validation | 5,000 - 13,000 |
| Payment & deposits | Card, transfer, installments | 4,000 - 11,000 |
| Roles & permissions | Multi-user, workflows | 4,000 - 12,000 |
| API & integrations | ERP, accounting, calendar | 5,000 - 15,000 |
| Full platform | Complete project | 32,000 - 87,000 |
Timeline: 4-7 months. Annual maintenance: 15-20% of build.
Custom vs booking SaaS
SaaS is fast and cheap but caps out on business rules. Custom is an investment that fits your framework contracts and pricing logic.
| Criterion | Booking SaaS | Custom platform |
|---|---|---|
| Entry cost | 50 - 400 EUR/month | 32,000 - 87,000 EUR |
| 3-year cost | 5,000 - 20,000 EUR | 40,000 - 100,000 EUR |
| Pricing rules | Basic | Unlimited |
| B2B framework contracts | Rarely handled | Native |
| Roles & approval | Limited | Custom |
| ERP integration | Add-ons | Full via API |
| Extensibility | Constrained | Total |
If your pricing is simple and clients few, stay on SaaS. Once pricing becomes a competitive edge, custom is justified.
Mini case study
Julien runs a Berlin firm renting event spaces and equipment: 40 resources, 250 B2B clients, prices negotiated per framework contract. Bookings used to go through email and spreadsheets; occupancy ~62%, with regular double bookings. He invests 58,000 EUR in a custom platform (calendar + dynamic pricing + roles + payment).
Outcome: occupancy up to ~78% (+16 points), which on a reference revenue of 1.2M EUR means roughly +190,000 EUR/year in additional bookings. Even keeping only a 20% net margin, the annual gain exceeds the investment within the first full year of operation.
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FAQ
Why is dynamic pricing so expensive?
Because it encodes your commercial logic: volume discounts, seasonality, framework contracts, options. This module often accounts for 25-30% of the total budget (8,000-22,000 EUR).
Can a SaaS really not handle my framework contracts?
Most handle a public rate and a few discounts, not per-client grids with specific conditions. That's the tipping point toward custom.
Can the platform connect to our ERP?
Yes, via API: syncing resources, clients and invoices. Budget 5,000 to 15,000 EUR depending on the ERP and the real-time level.
How long until go-live?
A calendar + booking + payment MVP ships in 12-16 weeks; advanced dynamic pricing and integrations follow in later increments.
How do we avoid double bookings?
The engine locks slots in real time and manages resource conflicts. It's native in the calendar module and almost entirely eliminates duplicates.
Let's scope your project. Describe your resources, pricing logic and integrations, and we'll price a fitting B2B booking platform (30,000-90,000 EUR). 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.
