What does it actually cost to build a SaaS?
There is no single number, because "a SaaS" can mean a weekend internal tool or a billing platform serving thousands of tenants. The useful answer is a range tied to scope. In 2026, a focused SaaS MVP — authentication, one core workflow, and Stripe subscriptions — typically costs between $15,000 and $40,000 when built by a senior developer. A market-ready V1 with multi-tenancy, role-based access, an admin dashboard, and a few integrations usually lands between $40,000 and $120,000.
Those ranges assume the product is built once and built right: TypeScript, a tested API, a real database schema, and a deployment that won't need a rewrite in six months. Cheaper quotes exist, but they almost always trade away test coverage, security, or maintainability — costs that resurface later as rework.
The 8 factors that move the price
Two SaaS projects with the same one-line pitch can differ 5x in cost. These are the variables that explain the gap, roughly in order of impact:
- Feature scope — every screen, workflow, and edge case adds engineering time.
- User roles & permissions — an admin/user split is cheap; granular RBAC is not.
- Multi-tenancy — isolating data per customer is a core-architecture decision, not a feature you bolt on later.
- Integrations — payments, email, analytics, CRMs, and AI APIs each add scope and failure modes.
- Real-time features — live dashboards, notifications, and collaboration need WebSockets and more infrastructure.
- Design fidelity — a polished, custom design system costs more than a clean component library.
- Compliance — SOC 2, HIPAA, or GDPR data-handling requirements add meaningful engineering and process cost.
- Who builds it — a solo senior dev, a freelance team, and an agency price the same scope very differently.
Why an MVP is almost always the right first spend
The most expensive SaaS mistake is building the full vision before a single customer has paid. An MVP exists to answer one question — will people use and pay for the core workflow? — for the smallest possible budget. Everything not required to answer that question is deferred.
A well-scoped MVP keeps the architecture honest (real auth, real database, real billing) while cutting the feature list to the essentials. That gets you to market in weeks instead of months, and the revenue and usage data it produces is what should fund the larger V1.
Solo developer vs. freelance team vs. agency
Who you hire changes the price more than almost anything else. A senior solo developer who owns the whole stack carries no account-manager overhead and no junior-developer learning curve on your budget — for a well-defined V1, that typically lands 40–60% below an agency quote for the same scope.
Agencies make sense when you need multiple specialists working in parallel under deadline. A solo senior developer makes sense for most early-stage SaaS products, where coherence, direct communication, and a single owner of the codebase matter more than raw headcount.
Don't forget ongoing costs
The build is a one-time number; running the product is recurring. Budget for hosting and database (often $20–$300/month early on, scaling with usage), third-party APIs (email, payments fees, AI tokens), monitoring, and maintenance. As a rule of thumb, plan for ongoing costs of roughly 15–25% of the build cost per year once the product is live and being actively improved.
2026 SaaS build cost by stage (senior developer / small team)
| Stage | What's included | Typical timeline | Typical cost |
|---|---|---|---|
| Lean MVP | Auth, one core workflow, Stripe billing, basic dashboard | 4–8 weeks | $15,000–$40,000 |
| Market-ready V1 | Multi-tenancy, RBAC, admin panel, 2–4 integrations | 2–4 months | $40,000–$120,000 |
| Scaled platform | Advanced features, real-time, analytics, compliance | 4+ months | $120,000+ |
Ranges reflect senior/solo or small-team rates. Large agencies commonly quote 1.5–3x these figures for the same scope.