Short answer: a SaaS product costs about $25,000 to $60,000 (roughly £20,000 to £48,000) for a first version real customers can subscribe to, $60,000 to $150,000 (roughly £48,000 to £120,000) for a production platform with multiple roles, billing and integrations, and $150,000 upwards for anything serving many organisations at scale. On top of the build, plan for 15 to 25 percent of the build cost every year just to keep it running.
SaaS is more expensive than most founders expect, and the reason is rarely the features. It is that a subscription product has to do several things a normal web application never has to: keep every customer's data separated, take money reliably every month, stay available while you deploy, and keep working for the customer who signed up two years ago.
Here is what that actually costs to build and to run.
Why SaaS costs more than a web app
A typical web application serves one organisation. A SaaS product serves many, at the same time, from the same codebase, and this changes the engineering in four specific ways.
Multi-tenancy. Every query, every file, every background job has to be scoped to the right customer. Getting this wrong once is a data breach, so it has to be designed in at the start rather than retrofitted.
Subscription billing. Plans, trials, upgrades, downgrades, proration, failed payments, dunning, tax in multiple jurisdictions, invoices and refunds. Payment providers handle a lot of this, and it is still routinely underestimated by several weeks.
Availability. Customers pay monthly and expect the product to be there. That means deployments that do not take the product down, backups that are actually tested, monitoring that pages someone, and a plan for the day a dependency fails. Our guide to DevOps agencies versus DevOps as a service covers who does this work.
Backwards compatibility. You cannot change the database and tell customers to adapt. Every change has to work for everyone already using the product.
For the same visible feature list, those four requirements add meaningfully to the build. It is the main reason a SaaS quote looks high next to an internal tool that appears to do the same thing.
SaaS development cost by stage
| Stage | What it includes | Typical cost (USD) | Typical cost (GBP) | Timeline |
|---|---|---|---|---|
| SaaS MVP | One core workflow, sign-up, single plan billing, basic multi-tenancy | $25,000 to $60,000 | £20,000 to £48,000 | 3 to 5 months |
| Production platform | Roles and teams, multiple plans, integrations, admin tooling, analytics, support paths | $60,000 to $150,000 | £48,000 to £120,000 | 5 to 9 months |
| Scale platform | High availability, heavy data, real-time features, public API, compliance certification | $150,000 to $400,000+ | £120,000 to £320,000+ | 9 to 18 months |
These are industry-typical ranges for 2026. If you are at the earliest stage and testing whether anyone wants the product at all, read our MVP development cost guide first, because the cheapest SaaS is the one you did not build until somebody asked for it.
The costs founders forget
The build price is the part everyone compares. These are the parts that determine whether the business works.
| Running cost | Typical monthly range | Notes |
|---|---|---|
| Hosting and infrastructure | $50 to $2,000 | Scales with customers and data, not features |
| Payment processing | 1.5 to 3 percent of revenue | Plus fixed per-transaction fees |
| Monitoring, logging, error tracking | $30 to $300 | Non-negotiable once you have paying customers |
| Email and messaging | $20 to $500 | Transactional volume grows with users |
| Third-party services and APIs | $50 to $1,000 | Every integration has a price at volume |
| Maintenance and support engineering | 15 to 25 percent of build cost annually | Security patches, dependency updates, bug fixes |
That last row is the one that catches people. A $100,000 platform needs roughly $15,000 to $25,000 a year of engineering just to stay where it is, before a single new feature. Budget for it at the start or the product quietly rots.
Add to that the costs that are not engineering at all: support, onboarding, documentation, and whatever compliance your market demands. SaaS sold to enterprises will eventually be asked for a security questionnaire, and answering it properly is a project of its own.
Where the build budget goes
On a typical production SaaS build, the split looks roughly like this.
- Core product features, the thing customers are paying for: 40 to 50 percent
- Accounts, permissions, teams and multi-tenancy: 15 to 20 percent
- Billing and subscription handling: 10 to 15 percent
- Admin tooling, support access and internal reporting: 10 percent
- Infrastructure, deployment and monitoring: 10 percent
- Design and interface work: varies widely, 10 to 20 percent
Roughly half the budget goes on things your customer never asks about and would never list as a feature. That is normal, and a quote that does not account for it is not a cheaper build. It is the same build with the unglamorous half left out, which you will pay for later at a worse rate.
Build it custom, or assemble it
Custom build. Full control, your own code, no ceiling on what you can do. Right when the product itself is the business, when the core logic is genuinely yours, or when you intend to raise money on the strength of the asset.
No-code and low-code platforms. Much faster and cheaper to a first paying customer. Real limits appear around performance, complex permissions, and the point where platform fees scale with your user count rather than your revenue. Entirely reasonable for validating demand, and several successful products have run this way for years.
Hybrid. The most underrated option. Run the marketing site, billing, onboarding and support on tools built for those jobs, and write custom code only for the part that is actually your product. Most early SaaS businesses should be doing this, and most instead build everything from scratch because it feels more like a real company.
Who builds it
In-house team. Highest ongoing cost, best long-term outcome if the product is the company. A small team of two or three engineers plus a designer is a serious annual commitment before anything ships.
Agency. Predictable cost, a full team on tap, and faster to launch because the process already exists. The thing to check is what happens after handover, because a SaaS product is never finished. Make sure the code, infrastructure and documentation are yours, and that someone is contracted to keep the lights on.
Freelancers. Cheapest per hour and the highest variance in outcome. Workable for a well-specified MVP. Risky for a platform that has to run for years, because the person who understands the system can stop answering messages.
Offshore teams. Genuine cost savings exist. The gap is usually project management, product thinking and design rather than engineering skill, so budget for someone on your side who can specify work properly.
How to reduce the cost without wrecking the product
Launch with one plan. Pricing tiers multiply the billing logic and you do not yet know what people will pay for.
Use managed services. Managed databases, managed authentication, a hosted payment provider. Running these yourself to save a monthly fee costs far more in engineering time than it saves.
Restrict the first version to one type of customer. Serving agencies and enterprises and individuals from day one means three onboarding flows, three permission models and three support burdens.
Postpone the public API. It is a real product with its own versioning and documentation burden. Build it when a customer is asking and paying.
Keep admin tooling ugly. It works or it does not. Nobody outside your company will ever see it.
Do not build single sign-on until an enterprise deal depends on it. Then charge for it.
Bottom line
A SaaS MVP that real customers can subscribe to starts around $25,000 to $60,000, a production platform runs $60,000 to $150,000, and whatever you spend on the build you should plan to spend 15 to 25 percent of again every year keeping it alive. Be ruthless about the first version, assemble whatever you can rather than writing it, and spend the saved budget on the second version, which is the one shaped by actual customers.
Book a free call and we will scope your SaaS build properly, including what it will cost to run, not just what it costs to write.