How Long Does It Take to Build an App? UK Timeline Guide (2025)
How Long Does It Take to Build an App? UK Timeline Guide (2025)
Quick Timeline Reference
| App Type | Timeline | |---|---| | Simple MVP / prototype | 4–8 weeks | | Basic business web app | 8–16 weeks | | Customer-facing mobile app | 12–24 weeks | | SaaS product, multiple user roles | 16–32 weeks | | Enterprise platform | 6–18+ months |
What Affects App Development Time?
1. Clarity of Requirements
The biggest variable. 'We need a customer portal' could mean 4 weeks or 6 months. Detailed specifications, wireframes, and defined user stories compress timelines dramatically.
2. Custom Design vs. Component Library
Custom UI design adds 2–6 weeks. Using an established component library (shadcn/ui, Material UI, Tailwind) gets you professional results much faster.
3. Third-Party Integrations
Each integration (Stripe, Salesforce, accounting software) adds 1–3 weeks including testing.
4. Mobile vs. Web
- Web app: fastest
- Responsive web app: minimal extra time
- Native iOS + Android: 40–60% longer
- React Native / Flutter (cross-platform): 20–30% faster than two native apps
5. Team Size
- 1 developer: longest, no parallel work
- 2–3 developers: balanced, parallel feature development
- Large agency: risk of coordination overhead
Red Flags When Getting Quotes
🚩 'We can build your app in 2 weeks for £2,000' 🚩 No discovery phase before quoting 🚩 No detailed breakdown of costs 🚩 No mention of testing 🚩 No mention of ongoing hosting or maintenance costs
Gridisys App Development
- Fixed-price projects from £5,000
- 4–16 week typical timelines
- AI integrated from day one
- Full code ownership at delivery