The verdict in three sentences
A B2B booking platform with automatic quotes costs roughly USD 38,000 to 82,000 (about EUR 35,000 to 75,000) in 2026, and the spread depends almost entirely on the quality of the specification. A document limited to 25 prioritized user stories, with calendar and invoicing integrations described field by field, makes a 4-month timeline realistic. Hold back a 15% contingency in the budget, or the first change order will land before acceptance testing.
What the specification must contain
The owner of a meeting venue network often receives three quotes that cannot be compared, because each agency imagined a different product. The specification fixes the scope before anyone talks price. Keep it to 15 to 25 pages: beyond that, nobody reads it again.
| Section | Expected content | Weight in the estimate |
|---|---|---|
| Context and goals | Number of rooms, booking volume, measurable goal (e.g. 40% of requests handled without a phone call) | Low |
| User profiles | Corporate client, executive assistant, venue manager, accountant | Medium |
| Prioritized user stories | 25 stories ranked with MoSCoW, acceptance criteria | High |
| Quote engine | Pricing rules: capacity, half day, catering, AV equipment, volume discounts | Very high |
| Integrations | Calendar (Google or Microsoft 365), invoicing (QuickBooks, Xero) | High |
| Non-functional requirements | Response time, privacy (CCPA-style rules), US hosting, ADA accessibility | Medium |
| Planning and acceptance | Milestones, test environment, validation criteria | Medium |
The quote engine is the most underestimated part. A 40-seat room with a projector, coffee break and lunch, booked for three days by a company under a master agreement, combines five pricing rules. If those rules are not written down, the agency will discover them mid-project and bill the difference.
The 25 user stories and their cost
Twenty-five user stories are enough for a useful first release. The classic mistake is listing 70, then cutting in a panic in month three. The table below gives a 2026 order of magnitude per functional block, based on a blended agency day rate of USD 600 to 760.
| Functional block | Stories | Estimated days | Indicative cost (USD) |
|---|---|---|---|
| Room catalog and availability | 5 | 12 to 18 | 7,600 to 13,000 |
| Booking and payment (deposit, ACH, card) | 5 | 10 to 16 | 6,500 to 12,000 |
| Automatic quote and approval | 6 | 15 to 25 | 9,800 to 18,500 |
| Corporate client portal (multi-user) | 4 | 8 to 14 | 5,400 to 10,300 |
| Calendar sync | 2 | 5 to 9 | 3,300 to 6,500 |
| Invoicing connector | 2 | 5 to 10 | 3,300 to 7,600 |
| Manager back office and reporting | 1 | 4 to 8 | 2,200 to 6,000 |
| Total before contingency | 25 | 59 to 100 | 38,000 to 74,000 |
With a 15% contingency, the top of the range reaches about USD 82,000. Do not hand that contingency to the agency upfront: keep it in reserve and release it through written change orders, story by story.
A realistic 4-month schedule
| Month | Deliverables | Checkpoint |
|---|---|---|
| Month 1 | Mockups, data model, quote rules signed off | Mockups approved by the owner and two pilot clients |
| Month 2 | Catalog, availability, booking | Demo in the test environment |
| Month 3 | Automatic quotes, client portal, integrations | 20 real quotes compared with manual ones |
| Month 4 | Invoicing, acceptance, go-live | Signed acceptance, 2 weeks of enhanced warranty |
The 20-real-quote test in month 3 is decisive. If more than 2 automatic quotes deviate by more than 5% from the manual quote, the pricing rules are poorly described, and it is better to fix them before go-live.
Mini case study
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Natalie runs a network of four meeting venues in Miami and handles 180 quote requests a month. Each manual quote takes her team 35 minutes, or 105 hours a month. With the platform, she targets 60% of quotes generated automatically: 108 quotes at 5 minutes of review instead of 35, saving 54 hours a month.
At a fully loaded cost of USD 38 an hour, that is about USD 2,050 a month, or USD 24,600 a year. Add a 3-point conversion lift from instant answers (average booking USD 2,600, 5 extra bookings a month): USD 13,000 more revenue per month. For a USD 60,000 project including contingency, payback lands around 5 to 7 months.
FAQ
How long does it take to write the specification?
Plan 3 to 5 weeks, including 4 to 6 two-hour workshops with the team and two pilot clients. External support usually costs USD 3,300 to 6,500, often credited against the build if the same agency delivers it.
Custom build or an off-the-shelf booking tool?
A booking SaaS costs USD 160 to 650 a month but handles quotes combining rooms, catering and master agreements poorly. Above 100 complex quotes a month, custom software pays back within 2 to 3 years.
Why cap the first release at 25 user stories?
Each extra story adds 2 to 4 days of development and testing. Beyond 30, the 4-month timeline becomes unrealistic and acceptance testing stretches by at least 3 weeks.
What is the 15% contingency for?
It absorbs inevitable discoveries: a forgotten pricing rule, an invoicing API more limited than expected. On a USD 65,000 project, that is about USD 9,750 released only through written change orders.
Who owns the code and the data?
Require full assignment of code rights in the contract and hosting in a jurisdiction you control. Plan reversibility: a complete data export within 30 days of contract end.
Let's scope your project. Send us your number of rooms, your quote rules and your calendar and invoicing tools: we will price a first release between USD 38,000 and 82,000, delivered in about 4 months. 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.
