Ask how much it costs to build a SaaS product and you will usually get a range so wide it is useless, something like a few tens of thousands to several hundred thousand dollars. The range is not wrong. It just averages together projects that have nothing in common with yours.
More importantly, it answers the wrong question. A SaaS product is never finished. It costs money to build, money to run every month, and money to keep building once customers start asking for things. Most founders budget carefully for the first of those, guess at the second, and leave out the third, which is the one that never ends.
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The Short Answer
- Budget three costs: the first version, the monthly cost of running it, and the backlog after launch.
- The first version's cost depends mostly on how many workflows, user roles, integrations and payment flows it needs. Cut it to the one workflow that proves the product.
- Running costs are modest at launch for most B2B SaaS products and grow with usage.
- The backlog is the real budget. Features, fixes and updates arrive every month after launch, so plan for them monthly.
- Compare ways of paying by what happens after launch, not only by the quote for version one.
Why Online Cost Ranges Don't Help
Cost ranges for SaaS development are usually built by averaging projects of every size and kind. A two-screen internal tool and a multi-tenant platform with a dozen integrations end up in the same table. The midpoint describes neither.
The useful question is not what SaaS costs in general. It is what drives the cost of yours, and what happens to the budget once it launches. Both have clear answers.
Cost One: Building the First Version
The first version's cost is mostly set by scope, and scope is set by a handful of decisions.
| What you decide | Why it moves the cost |
|---|---|
| Number of core workflows | Each distinct path through the product (sign up, invite a teammate, create a report, export it) is its own design, build and test. |
| User roles and permissions | Admins, members and read-only users each see and do different things, and every permission has to be enforced everywhere. |
| Integrations | Every connection to another system (a CRM, an accounting tool, a data source) adds authentication, error handling and edge cases. |
| Billing | Plans, trials, upgrades, failed payments and invoices are a product in themselves. |
| Multi-tenancy | Keeping each customer's data separate and secure has to be designed in from the start. |
| Compliance | Requirements such as audit logs, data retention or security reviews add work that customers never see. |
The cheapest decision you can make is to cut the first version down to the one workflow that proves customers want the product. Every workflow you defer is cost you avoid until you know it is needed. Our guide to MVP development covers how to choose that workflow.
The second thing that sets the cost is how you pay for the work, because each model handles change differently. Our guide to outsourcing product development compares the six models in detail.
Cost Two: Running It
Once the product is live, it costs money every month whether anyone is building or not. For most early B2B SaaS products, this is the smallest of the three costs.
Those are entry paid plans from three tools common in modern B2B SaaS stacks, as published in October 2026, and they show the shape of the bill rather than its total. Free tiers are useful while you build, but they carry limits that matter once customers depend on you: Vercel restricts its Hobby plan to non-commercial use, and Supabase pauses free projects after a week of inactivity. Add authentication (Clerk's Pro plan is $25 a month, with a free tier of up to 50,000 monthly retained users), transactional email, error monitoring and a domain, and by our rough count a small B2B SaaS can launch on a few hundred dollars a month or less.
Two things grow it. Usage-based charges rise with customers, data and traffic. And payment fees scale with revenue: Stripe lists 2.9% plus 30 cents per successful domestic card payment, an extra 1.5% for international cards, and 0.7% of billing volume for Stripe Billing. For most early products, running costs stay small next to development, which is why they are the easiest of the three to budget and the least likely to sink you.
Cost Three: The Backlog After Launch
This is the cost most budgets leave out, and it is the one that never stops.
The day you launch, the list of things to do gets longer, not shorter. Customers ask for features you did not plan. Sales needs an integration to close a deal. A workflow that made sense in a demo confuses real users. Bugs turn up under real usage. The frameworks and libraries the product is built on release updates and security patches that need applying.
This is not a small line. Robert Glass, writing in IEEE Software in 2001, put maintenance at "about 40 to 80 percent (60 percent average) of software costs," and added that "enhancement is responsible for roughly 60 percent of software maintenance costs," against roughly 17 percent for error correction. He presented these as rules of thumb rather than findings from a single study, and his conclusion is the part that matters for a SaaS budget: "software maintenance is largely about adding new capability to old software, not about fixing it." In other words, most of what a product costs over its life is the backlog.
So treat the backlog as a recurring cost, like hosting, not as a project with an end. The question to budget for is not how much version one costs. It is how much it costs, every month, to keep the product moving at the pace your customers expect.
Version one is a project. Everything after it is a monthly cost, whether you plan for it or not.
How Each Way of Paying Handles the Whole Bill
| Way of paying | Version one | After launch |
|---|---|---|
| Hiring a developer | Salary from day one, plus weeks of recruiting | Same salary, steady capacity, if there is a full-time job's worth of work |
| Freelancer by the hour | Hours as billed | More hours for every change, if the freelancer is still available |
| Agency on a fixed price | A quote for a defined scope | New scope, new quotes or change orders |
| Development subscription | A flat monthly fee | The same flat monthly fee, worked through as a queue |
A hire is the most expensive way to get version one and often the cheapest way to run a full-time backlog for years. The US Bureau of Labor Statistics puts the median annual wage for software developers at $135,980 as of May 2025, before benefits and recruiting. Our guide to hiring a software developer covers the full cost and when a hire makes sense.
An agency quote is the most predictable way to buy version one and the least predictable way to pay for what comes after it. A subscription spreads both across the same monthly price, which suits a product whose backlog is steady but not yet a full-time job.
Budgeting for the backlog, not just the build?
A senior developer on subscription: $849 a month, as many requests as you like, each shipped within 2 to 3 business days, and your money back if the first 7 days don’t prove it.
How to Budget for a SaaS Build
- 1
List every workflow, then cut to one
Write down every path through the product you can imagine, then pick the one that proves customers want it. That is version one. The rest is the backlog.
- 2
Price version one under the same scope everywhere
Give every option the same one-page description. Quotes for different scopes cannot be compared.
- 3
Ask every option what version two costs
How changes after launch are priced, how fast they start, and who will make them. This is where the options differ most.
- 4
Add the running costs
Hosting, database, authentication, email and payment fees, at the plans you will actually need in the first year.
- 5
Budget the backlog monthly
Set a monthly amount for ongoing development, the way you would for any other recurring cost, and review it each quarter against what customers are asking for.
Which Way to Pay
Predictable for the build. Agree in writing how changes after launch are priced before you sign, because that is where the budget usually goes.
One flat monthly price for the build and everything after it, so the backlog has a budget from the start. You can pause when work is quiet.
Over a few years, a good employee is usually the cheapest way to run a full-time backlog. Hire senior first.
Where a Development Subscription Fits, and Where It Doesn't
We run a product development subscription, so read this with that in mind.
It fits a B2B SaaS company that needs version one built and then a steady stream of work after it: the features customers ask for, the integrations sales needs, the fixes and updates. The price is the same every month, requests are worked through one at a time, and you can pause when things are quiet. That turns the backlog from an unknown into a line in the budget.
It does not fit everything. A large first version that needs several developers in parallel to hit a date is better served by a team. We do not build native mobile apps. And once the backlog is a full-time job with someone to direct it, a hire will usually cost less.
The Bottom Line
The question "how much does SaaS development cost" has three answers, and most budgets only include one. Building version one is a project with a scope you can control. Running it is a modest monthly bill. The backlog after launch is the cost that decides whether the product keeps moving, and it never ends.
Cut version one to the workflow that proves the product, price the running costs at the plans you will really need, and give the backlog a monthly budget from the start. Then compare every way of paying by what version two costs, not just the first quote.
