If you have asked three different agencies how long it takes to build a web app and gotten three completely different answers, that is not evasion — it is the honest reality of a question with no universal answer.
Realistic Timelines
- Simple MVP with 3 to 6 features: 6 to 12 weeks
- Mid-complexity SaaS or web app: 3 to 6 months
- Complex enterprise platform: 6 to 18 months
What Building Actually Includes
Most people underestimate what is involved in a production-ready web app. A professional timeline includes: discovery and scoping, UI/UX design, front-end development, back-end development, API integrations, database setup, authentication and security, QA and cross-device testing, performance optimisation, deployment, and documentation.
What Makes Projects Take Longer
- Unclear requirements — Every hour spent clarifying after development starts costs 5 to 10 times more than clarifying upfront
- Scope creep — Adding features mid-development is the single biggest timeline killer
- Slow approvals — If design approvals take a week instead of a day, a 10-week project becomes 14 weeks
- Third-party dependencies — Waiting for API access, credentials, or external approvals
What Makes Projects Faster
- Clear scope document before day one
- Decisive stakeholder — fast approvals on designs and decisions
- Pre-built components for auth, payments, and notifications
- Experienced team who have built similar things before
- Parallel workstreams — design and back-end development running simultaneously
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