How Much Does It Cost to Build a SaaS: From Idea to Product

A SaaS costs between 15,000 and 50,000 euros for a functional MVP that validates an idea with the first users, and between 50,000 and 150,000 euros or more for a mature product with several modules, fine-grained role management, and infrastructure ready to scale. The budget mainly depends on the number of features actually essential at launch, not on the final vision of the product three years down the line.

The trap of an overly ambitious scope from the start

The most common mistake in a SaaS project is trying to develop, from the very first version, every feature imagined for the final product. This approach multiplies the initial budget, delays launch by months or even years, and deprives the team of feedback from early users before the entire budget has been spent.

An MVP (minimum viable product) reverses this logic: it focuses on the features strictly necessary for a first group of users to solve their problem with the product, even if that means leaving aside secondary features planned for later. This approach reduces the initial budget, speeds up time to market, and above all makes it possible to verify that the product addresses a real need before investing further.

The second budget trap concerns infrastructure. A SaaS is not a site you deliver and forget: it's a service that must remain available, secure, and performant as long as customers depend on it. Hosting, security, and support costs increase with the number of users, and must be factored into the business model from the design stage, not discovered after launch.

What sets a SaaS budget apart from a standard application

Isolated multi-tenant management. A SaaS serves several customers (or organizations) on the same infrastructure, while guaranteeing that each one's data stays strictly separated. This architecture, called multi-tenant, requires rigorous design from the outset.

Automated recurring billing. Subscriptions, free trials, plan changes, handling failed payments: integrating a reliable recurring billing system is a development item in its own right, generally delegated to a specialized payment provider rather than recoded from scratch.

Availability and scalability. A customer paying a monthly subscription expects a permanently available service. Designing infrastructure capable of absorbing growth without service interruption requires specific technical expertise, often absent from a standard application development project.

Support and onboarding. A growing SaaS needs to guide its new users (documentation, in-app tutorials, support) to limit churn, which represents an ongoing investment beyond the initial development.

MVP, intermediate product, mature product

The MVP covers the minimal functional core: one well-executed main feature, basic account management, and a simple payment system. The goal is to verify market interest with the smallest possible budget, generally by relying as much as possible on existing technical building blocks (authentication, payment, cloud hosting) rather than recoding every component.

The intermediate product adds features validated by early user feedback: finer-grained roles and permissions, custom dashboards, integrations with other tools used by customers. The budget increases based on the number of modules added and the complexity of each.

The mature product covers several interconnected modules, infrastructure sized for a large volume of users, and often a dedicated development team working continuously rather than on a one-off project. At this stage, the budget is better thought of as a recurring annual cost than a one-time investment.

The recurring cost, not just the development cost

Unlike a brochure site or even a mobile app, a SaaS generates infrastructure costs that scale directly with the product's success. The more active users grow, the more computing, data storage, and bandwidth needs grow, which translates into a cloud hosting bill that follows this growth.

This link between cost and growth must be built into the pricing model offered to customers from the design stage, or you risk ending up with a product that gains users but loses money on each one. Setting a subscription price without having estimated the infrastructure cost per user is a common mistake among SaaS founders who discover the problem only after the product has already launched commercially.

Customer support costs follow a similar logic: the larger the user base grows, the higher the volume of questions and support requests, which sooner or later requires investing in documentation, support tools, or a dedicated person, on top of the technical development of the product itself.

Build versus buy: where to draw the line

A useful principle for controlling a SaaS budget is distinguishing what constitutes the product's truly differentiating value from what falls under generic functions already well solved by other services. User authentication, transactional email sending, recurring payment processing, and file hosting are needs common to nearly every SaaS, for which specialized services already exist, reliable and inexpensive to integrate.

Building these building blocks from scratch, rather than relying on existing services, consumes a development budget disproportionate to the actual added value for the end user, who generally sees no difference between in-house authentication and authentication delegated to a recognized service. Reserving custom development for what truly constitutes the product's competitive advantage remains the best way to control an MVP's budget.

Budget table by development stage

Development pace matters as much as total budget

An identical total budget can produce very different results depending on whether it's spent all at once on a long development period before any launch, or spread across several short cycles with intermediate releases. The second approach allows you to regularly verify that the product still matches users' actual needs, and to adjust the rest of the budget based on that feedback, rather than discovering a complete misalignment after several months of uninterrupted development.

What to remember

• A SaaS budget depends first on the functional scope chosen for the first version, not on the final vision of the product.
• A tightly scoped MVP reduces financial risk and makes it possible to validate the need before investing further.
• Relying on existing technical building blocks (authentication, payment, hosting) rather than recoding everything significantly reduces the initial budget.
• Multi-tenant management, recurring billing, and service availability are SaaS-specific line items, absent from a standard application.
• Infrastructure costs increase with user volume and must be anticipated in the pricing model, not discovered afterward.
• A no-code or low-code tool can allow testing an idea on a reduced budget, before investing in full development once the need is confirmed.

Conclusion

The best starting point for costing a SaaS remains precisely defining the core feature that alone justifies someone paying for the product, then building the MVP around it alone. To scope this and avoid an oversized budget from the start, custom development at VeryAppi lets you start from a real need rather than a theoretical feature list.