How Long Does It Actually Take to Build a SaaS?
Every founder asks this question. Every agency gives a different answer. The truth: it depends on scope, team, and decision-making speed. But here are realistic estimates based on real projects.
Phase 1: Discovery & Design (2–4 weeks)
What happens: user research, architecture planning, database design, UI/UX wireframes and mockups. What slows it down: unclear requirements, multiple stakeholders with conflicting opinions, scope creep during design. What accelerates it: clear user research, decisive product owner, using design systems.
Phase 2: MVP Development
- Simple MVP (auth + 1–2 core features + basic billing): 4–8 weeks
- Medium MVP (auth + 3–5 features + billing + admin): 8–14 weeks
- Complex MVP (multi-tenant + multiple AI features + integrations): 14–24 weeks
AI feature integration adds 2–4 weeks vs. non-AI equivalents (prompt engineering, testing, cost management).
Phase 3: Beta Launch (1–2 weeks)
Staging testing, bug fixes, landing page, onboarding email setup, analytics, monitoring. First users typically surface 20–30 bugs you didn't find internally — budget 1–2 weeks for this phase.
Phase 4: Growth Iteration (Ongoing)
Post-launch, realistic velocity: 2–4 new features per month with a 3–5 person team. Factors that slow iteration: technical debt from MVP shortcuts, unclear user feedback interpretation, team context-switching.
What Kills Timelines
- Scope changes mid-development (adds 20–50% to timeline)
- Slow feedback loops (weekly reviews instead of daily)
- Integration failures (external APIs changing, rate limits)
- Team ramp-up time (new developers need 2–4 weeks to become productive)