SaaS development cost: what you pay to build it and to keep it running

Why does a SaaS cost more to plan for than a website or an MVP?

Because a SaaS is never handed over once and forgotten: it stays live, serves many customers at the same time and bills them every month. That adds three families of cost a brochure site never has: keeping customers' data apart, recurring billing, and the ongoing work of keeping the product secure and up to date.

The question also differs from an MVP budget. An MVP exists to test whether the problem is real, and MVP development cost covers that budget. This piece is about the product that has to carry paying customers for years.

What drives the cost of building a SaaS product?

Seven factors drive most of it, and the choice of technology is rarely the biggest. This is our grid for reading a scope before putting a number on it.

Our pricing and timelines page sums up what drives cost and timeline, and the ways we can work together.

How do you estimate the build cost?

You multiply the people you need by the months of work and by what they cost, once the scope is written down feature by feature. Hourly rates, fixed bids and sprint packages are just different ways of presenting the same multiplication.

People are the big number. The US Bureau of Labor Statistics puts the median annual wage for software developers at $135,980 (May 2025), roughly $11,300 a month per developer before payroll taxes and benefits. Rates vary widely by country and seniority, but the logic holds everywhere: every extra month of scope costs a team, not a server.

What does a SaaS cost to run after launch?

After launch you pay every month for infrastructure, third-party services, payment fees and the work of keeping things current. Some of these have public, checkable prices; here are the official ones at the time of writing.

These prices change and differ by country (Stripe's US and UK rates, for instance, are not the EEA ones), so check the official page before you lock the plan. Hosting, databases, transactional email and monitoring depend on traffic and vendor. For a sense of scale in companies already selling, SaaS Capital surveys more than 1,000 private B2B SaaS businesses every year.

The same survey puts median R&D spend at 22% of ARR: even after launch, the biggest line is work on the product, not servers. These are medians for companies with revenue; before you have any, budget in currency per month, line by line, not in percentages.

Which costs do founders underestimate most?

Founders mostly underestimate the work that ships no new features: updates, security, support and app store reviews. None of it appears in the demo, all of it comes back every month.

• Maintenance: libraries and frameworks need updating, or vulnerabilities and technical debt pile up.
• Security and privacy: if you serve EU customers, the GDPR asks for security appropriate to the risk, including the ability to restore data after an incident (Article 32); backups have to be tested, not just taken.
• Support: every paying customer asks questions, and someone has to answer in reasonable time.
• App stores: with iOS and Android apps, every release goes through review, and in-app purchases come with their own rules and commission.
• Billing and tax: VAT or sales tax, receipts, failed payments, refunds. Your accountant is the reference here.
• Re-architecture: separating customers' data after launch costs far more than doing it before, as multi-tenant SaaS architecture explains.

How do you keep costs down without mortgaging the future?

Save on scope, never on foundations. Dropping a feature from the first release costs nothing; dropping tenant isolation tests or backups can cost you the company.

Three levers almost always work: a mainstream tech stack with a deep hiring pool and mature libraries; one platform to start with, usually a web app; and bought-in services for everything that does not set you apart, from payments to email. Your pricing model matters too: usage-based plans, for example, mean metering every customer's usage, as SaaS pricing models explains.

How do you read a quote for a SaaS build?

A trustworthy quote lists the features, separates the build from the running costs and states what is out of scope. Before you sign, check five things.

1. Every included feature is written out, with who uses it.
2. Auth, billing, tenant isolation and backups are explicit line items, not assumptions.
3. There is an estimate of monthly infrastructure and service costs after launch.
4. It is clear who owns the code, the data and the service accounts; see who owns the code in a software contract.
5. Post-launch maintenance and support have a scope and a price, even an indicative one.