The most common answer you'll get from a development agency to "how long will this take?" is "it depends." This article tells you what it depends on — and gives you realistic ranges for the most common project types.
Typical timelines by project type
| Project type | Realistic timeline | What this assumes |
|---|---|---|
| Internal ops tool | 4–8 weeks | Single workflow, no external integrations, small team |
| Customer-facing MVP | 10–16 weeks | Core feature set, auth, 1–2 integrations, deployed to production |
| SaaS product v1 | 16–28 weeks | Multi-tenant, billing, admin panel, 3+ integrations |
| E-commerce platform | 12–20 weeks | Catalogue, cart, payments, order management, fulfilment integration |
| Enterprise system | 6–18 months | Complex workflows, compliance, ERP integration, change management |
These are delivery timelines from project kickoff to production deployment. Add 2–4 weeks for discovery and scoping at the front, and 2–4 weeks for UAT and launch at the back.
The five factors that extend timelines
1. Integration complexity: Each third-party integration adds 1–3 weeks of engineering time. An API integration that should take three days often takes ten when you account for edge cases, rate limiting, error handling, and testing. If your project requires 5+ integrations, plan for this explicitly.
2. Unclear requirements: A project that begins with a well-written specification with user stories, data models, and acceptance criteria runs 30–40% faster than one that starts from a pitch deck and evolving stakeholder conversations. The most expensive thing in software development is building the wrong thing.
3. Client-side bottlenecks: Every decision that requires client approval that takes more than 24 hours adds days to the project. Design review, content sign-off, legal approval of copy — these are on the critical path but outside the development team's control.
4. Data migration: If the new system needs to import data from legacy databases, spreadsheets, or a previous tool, data quality issues will extend the timeline. Legacy data is almost always messier than expected — inconsistent formats, missing values, duplicate records.
5. Team ramp-up: A new development team needs 2–3 weeks to understand your domain, your codebase conventions, and your decision-making style. Projects that have continuity of team (same engineers across phases) run faster than projects that start from scratch with each new feature.
The phases you shouldn't skip to save time
Discovery: 1–2 weeks of structured requirements work, user story writing, and architecture planning before a single line of code is written. Skipping this to start coding faster is the most reliable way to lose time overall — rework is always slower than getting it right the first time.
QA: Automated tests and manual QA are not optional extras. Software without a test suite accumulates bugs faster than it can fix them. Budget 15–20% of engineering time for testing, or budget for a dedicated QA resource on larger projects.
Deployment rehearsal: The first production deployment almost always surfaces issues that didn't appear in staging. Build a deployment rehearsal into your timeline — run through the full launch process a week before go-live, not on the day.
For cost context alongside these timelines, see our guide to The Real Cost of Custom Software Development in 2026. Use our Cost Estimator to model budget based on your project type.