Right after “how much does it cost?”, the next question is always “how long will it take?” — usually because something’s riding on it: a launch, a season, a problem that needs solving now. Here’s the honest version, without the agency padding.
The honest short answer
As a rough guide:
- A web app or a focused first version (MVP) — about 2–4 weeks.
- A solid custom app for a small business — about 6–12 weeks from first conversation to live.
- A larger app with multiple user types, payments and integrations — 3–6 months, sometimes more.
The single biggest factor isn’t the code — it’s scope. A focused app that does one job well is live in weeks. A sprawling wishlist takes months. The second biggest factor is you: how quickly feedback and content come back. More on that below.
What actually happens, stage by stage
A typical small-business app moves through five stages. They overlap, but roughly:
1. Scope and plan (a few days to a week)
We nail down exactly what the app does, who uses it, and what the first version includes. This is where most of the cost and time is decided — getting it tight here saves weeks later. You get a plain-English plan and a fixed price before anything is built.
2. Design (around 1–2 weeks)
The screens and flow — what people see and tap. You see it and sign off before a line of code is written, so there are no expensive surprises mid-build.
3. Build (the bulk of the time)
This is where most of the weeks go. The app gets built on the agreed plan, with the back end behind it if it needs one. You’ll see it come together as we go, not just at the end.
4. Test (around a week)
Real testing on real devices — iPhone and Android, different screen sizes, the awkward edge cases. Forms, payments, logins, the lot.
5. Launch and app-store review
A web app goes live the moment it’s ready — no gatekeepers. A phone app has to be submitted to Apple and Google for review, which typically takes anywhere from a day to about a week, and occasionally longer if they ask for changes. It’s worth building this buffer into any launch date.
What slows a project down
Honest list, because forewarned is forearmed:
- Slow feedback. The biggest delay by far. If sign-off on the design takes three weeks, the project takes three weeks longer. The fastest builds happen when there’s one decision-maker who replies quickly.
- Scope creep. “Could it also do…” mid-build is how an 8-week project becomes a 6-month one. I’ll always tell you when a new idea is better saved for version two.
- Waiting on content. Logos, text, photos, product data, logins to other systems — if these arrive late, the build waits.
- Third-party integrations. Connecting to payments, a booking system or another provider depends partly on their setup, which is outside anyone’s full control.
The fastest route: build the version that matters first
If you need to be live sooner, the answer is almost always to start smaller. Build the focused first version — often a web app — that solves the one real problem, get it into people’s hands in weeks, then add to it once you know what they actually use. It’s faster, cheaper, and you learn before you spend.
Common questions
Can an app be built in a week?
A simple web app or a very focused MVP can be, yes. A full iPhone-and-Android app with a back end cannot be done well in a week — anyone promising that is cutting corners you’ll pay for later.
Does app-store approval really add time?
For phone apps, yes — budget for Apple and Google review (a day to about a week) on top of the build, and never promise customers a launch date that assumes instant approval. Web apps skip this entirely.
What’s the quickest way to launch?
A web app, or a small first version of a phone app. Both get you live and learning far sooner than waiting for the “complete” build.
The honest bottom line
For most small Irish businesses, a useful app is a matter of weeks, not months — provided the scope is focused and feedback comes back quickly. Tell me what you’re picturing and when you need it, and I’ll give you a realistic timeline up front — and tell you honestly if a simpler option would get you there faster. I work with businesses across Dublin, Cork, Galway and nationwide.
Tell me your app idea and I’ll give you a straight timeline.
