The verdict in three sentences
A custom business web app typically takes 12 to 22 weeks in 2026, from scoping to production. What derails the schedule is almost never the code: it's integrations and internal approvals. Shipping an MVP in 8 to 10 weeks lets you test a first version in real conditions and adjust before investing in the full scope.
The phase-by-phase breakdown
A CEO who wants a realistic timeline should think in phases, not raw coding weeks.
| Phase | Typical duration | Deliverables |
|---|---|---|
| Scoping & specs | 2-3 weeks | Spec, user stories, backlog |
| UX/UI design | 2-4 weeks | Mockups, clickable prototype |
| Development | 6-12 weeks | Features, integrations |
| UAT & fixes | 2-3 weeks | Acceptance tests, corrections |
| Go-live | 1 week | Deployment, training |
| Total | 12-22 weeks | App in production |
Phases partly overlap (design starts before scoping ends), but total duration is driven by the critical path of development.
What stretches (or shortens) timelines
| Factor | Impact on schedule |
|---|---|
| Complex ERP/CRM integration | +2 to +6 weeks |
| Slow internal approvals | +1 to +4 weeks |
| Content/data not ready | +1 to +3 weeks |
| Scope changing mid-project | +2 to +8 weeks |
| MVP approach (reduced scope) | -4 to -8 weeks |
| Available client team & single decision-maker | -1 to -3 weeks |
The most underestimated factor is client-side availability: every approval cycle that drags a week pushes go-live back by the same amount.
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Mini case study
Helene, CEO of a services SME in Nantes, wants a client-case tracking app. The full scope (client portal, billing, reporting, accounting integration) is estimated at 18 weeks and 58,000 EUR. Rather than wait four and a half months, she opts for a 9-week MVP (case tracking + notifications) at 26,000 EUR. Her teams use it from week 10, feed back adjustments, and the billing module is prioritized based on real usage. Result: she captures value 9 weeks earlier, avoids two planned but ultimately useless features (estimated 7,000 EUR saving), and completes the full scope in 20 weeks total without exceeding budget.
FAQ
Can an app be delivered in under 8 weeks? Yes for a very targeted MVP (1 to 2 features, no heavy integration), but rarely for a full business app. Below 8 weeks you mostly cut UAT, which you pay for later in production.
Why does scoping take 2 to 3 weeks? Because it freezes the scope, user stories and acceptance criteria that drive everything else. Rushed scoping means back-and-forth that costs far more than the 2 weeks saved.
Does the timeline mainly depend on code? No. In 2026, integrations, data quality and client decision speed often weigh more than development itself. A single, available decision-maker can shorten the project by several weeks.
What exactly is an MVP? The smallest version that delivers real business value: one core feature, usable in production. It's meant to test early, learn, and prioritize the rest by usage rather than assumptions.
How do I hold the schedule? A single decision-maker, approval slots planned in advance and scope frozen per sprint. Mid-project scope creep is the top cause of delay on software projects.
Let's scope your project. Tell us your need, your deadline and whether an MVP interests you: we'll propose a realistic phase-by-phase timeline. 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.
