The verdict in three sentences
A B2B booking application has nothing to do with a consumer calendar: it manages multi-user company accounts, complex availability rules and professional billing. In 2026, the realistic budget ranges from 25,000 EUR excl. tax for a focused booking tool to 70,000 EUR excl. tax for a full platform with payment, billing and notifications. The real trade-off is between a booking SaaS rented monthly and a custom solution you own.
What each budget tier covers
A services company does not pay for a form, it pays to eliminate the back-and-forth of scheduling and streamline the relationship with its professional clients. The difference between 25,000 and 70,000 EUR comes down to business rules (availability, resources) and scope (payment, billing, multi-site).
| Tier | 2026 budget (EUR excl. tax) | Scope | Timeline |
|---|---|---|---|
| Focused booking | 25,000 - 35,000 | Availability, pro accounts, notifications | 3-4 months |
| Standard platform | 35,000 - 50,000 | + multi-user, payment, resource management | 4-5 months |
| Full platform | 50,000 - 70,000 | + billing, multi-site, API, dashboards | 4-5 months |
| Recurring line item | 600 - 2,000 /month | Hosting, support, enhancements | ongoing |
The cost of a booking SaaS looks low upfront, but it climbs with the number of users and sites. Over 3 years, custom often becomes competitive while making you the owner of the data and business logic.
| Criterion | Booking SaaS | Custom |
|---|---|---|
| Entry cost | 200 - 600 /month | 25,000 - 70,000 EUR excl. tax |
| 3-year cost (10-20 users) | 15,000 - 40,000 EUR | 30,000 - 78,000 EUR |
| Specific business rules | limited | full |
| Data ownership | vendor | you |
| Brand customization | low | full |
| Billing/ERP integration | often paid | native |
SaaS or custom: how to decide?
If your needs are standard and your volume modest, a booking SaaS gets you online in a few days for a few hundred euros per month. As soon as your availability rules are specific (slots per resource, quotas per client, negotiated pricing), or you exceed 15-20 users, custom regains the advantage over 3 years, with the bonus of owning your platform and no dependence on a vendor.
Mini case study
Julien, head of a construction equipment rental company in Bordeaux (35 recurring pro clients), is undecided. On SaaS, with 18 users and 3 branches, he would pay around 550 EUR/month, i.e. 19,800 EUR over 3 years, with no integrated billing or per-client negotiated pricing. He chooses a custom platform at 44,000 EUR excl. tax with billing and contractual rates. The platform saves him 12 hours/week of manual booking management, roughly 2,400 EUR/month of admin time. Custom pays for itself in under 19 months and then belongs to him entirely.
FAQ
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What is the difference from a simple appointment scheduling module?
A consumer module manages a calendar and slots. A B2B app manages company accounts, per-user rights, negotiated pricing and professional billing, which explains the budget gap.
Should online payment be integrated from the start?
Not always: in B2B, many clients pay by invoice. Plan integrated billing (5,000 to 12,000 EUR) instead and add online payment if you target clients who pay in advance.
How long to launch a first version?
Plan 3 to 5 months for a full platform. A focused version (availability + pro accounts) can ship in 3 months and then grow through iterations.
Does SaaS really cost more in the long run?
Not always: below 10 users with standard needs, SaaS remains unbeatable. Above 15-20 users or with specific rules, custom becomes competitive over 3 years.
Can the app connect to my ERP or accounting?
Yes, via API. Plan 4,000 to 10,000 EUR excl. tax depending on complexity, to sync bookings, invoices and clients without duplicate entry.
Let's scope your project. Focused booking, standard or full platform with billing: specify your number of users, availability rules and 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.
