The verdict in three sentences
A web app MVP is built in 3 to 4 months in Dublin in 2026, a full v1 in 5 to 8 months, including integration and acceptance testing. Always add a 20 % safety buffer: plans with no cushion overrun in 7 cases out of 10. Every month of delay costs 9,000 to 17,000 EUR between an idle team and deferred revenue, which is why clear billing milestones matter.
The typical timeline, phase by phase
An app project is not a straight line. It breaks down into phases, each with its own uncertainties. Here are the durations observed in Dublin for a medium-complexity application (business portal, light B2B SaaS).
| Phase | MVP duration | v1 duration | Overrun driver |
|---|---|---|---|
| Scoping & design | 3-5 weeks | 4-6 weeks | Fuzzy scope |
| Core development | 8-12 weeks | 14-22 weeks | Technical complexity |
| Third-party integrations | 2-3 weeks | 4-8 weeks | External API dependency |
| Acceptance & testing | 2-3 weeks | 3-4 weeks | Late-surfacing bugs |
| Deployment & fixes | 1-2 weeks | 2-3 weeks | Production environment |
| Total | 3-4 months | 5-8 months | +20 % buffer |
Third-party integrations (payment, ERP, partner APIs) are the leading source of delay: they depend on players you do not control, so plan a specific margin for them.
The cost of delay and billing milestones
A delay is never free. It ties up your internal team, defers revenue and can make you miss a commercial window. Here is the 2026 order of magnitude for the cost of a month's delay by project size.
| Project size | Team mobilised/month | Deferred revenue | Total cost/month of delay |
|---|---|---|---|
| Small (simple MVP) | 4,500 EUR | 4,500 EUR | 9,000 EUR |
| Medium (SaaS v1) | 7,000 EUR | 7,000 EUR | 14,000 EUR |
| Large (multi-module) | 9,000 EUR | 8,000 EUR | 17,000 EUR |
| Critical (time-to-market) | 9,000 EUR | 14,000 EUR | 23,000 EUR+ |
To align interests and cash flow, structure billing by milestones: 30 % at scoping, 40 % at core delivery, 20 % at validated acceptance, 10 % after 30 days of stable production. This protects both parties and makes progress objective.
Mini case study
Julien, project manager at an industrial firm in Dublin, must deliver a SaaS customer portal before a trade show in 7 months. The raw estimate is 6 months. With no buffer, he aims exactly at the show date.
Applying the 20 % safety buffer, the realistic plan becomes 7.2 months: he misses the show. So he decides to cut the MVP scope to the essentials (delivered in 4.5 months with buffer) and defer two modules to v1.1. Result: a successful show demo, and the 17,000 EUR cost of a month's delay is avoided. The lesson: better to adjust scope than the schedule.
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FAQ
Why add a 20 % safety buffer?
Because 70 % of projects with no buffer overrun. The 20 % covers normal contingencies: bugs, external dependencies, acceptance round-trips. It is not fat, it is statistical realism.
How long for an MVP in Dublin in 2026?
Between 3 and 4 months for a well-scoped perimeter. An MVP shipped in under 8 weeks is often a disguised prototype, not a production-usable product.
What makes a schedule slip most?
Third-party integrations and fuzzy scope. External APIs depend on players you do not control, and a poorly scoped need generates costly round-trips.
How should billing milestones be structured?
A common pattern: 30 % scoping, 40 % core, 20 % acceptance, 10 % after stabilisation. It aligns payment with delivered value and protects both sides.
Can we speed up by adding developers?
Rarely in a linear way. Beyond a point, adding developers slows things down (coordination, context ramp-up). Cutting scope is almost always more effective.
Let's scope your project. Give us your target scope and deadline, and we will build a realistic plan with a 20 % buffer and clear billing milestones. 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.
