The honest answer is that custom software costs anywhere from a few thousand pounds to several hundred thousand, and the range is that wide because “custom software” covers everything from a single automation to a platform that runs a company. That’s an unsatisfying answer, so this piece does the more useful thing and explains what moves the number, so you can look at your own project and see roughly where it sits and why.
We won’t quote you a fake precise figure, because anyone who gives you one without understanding your project is guessing. What we can give you is what drives the cost.
What actually drives the price
Five things account for most of the variation:
- Scope. The number of distinct things the software has to do. One well-defined job is cheap. A system handling ten interlocking processes is not, and the cost rises faster than the feature count because the parts have to work together.
- Integrations. Every other system it connects to (your accounting tool, your CRM, a payment provider, a supplier’s API) adds work, and the messier the system you’re connecting to, the more.
- Data migration. Moving years of existing data into the new system, cleaning it, and losing nothing is routinely underestimated. It is often a project in its own right.
- Complexity of the rules. Simple, predictable logic is quick to build. Edge cases, approval chains, and “except when” conditions take real time to get right.
- Polish and scale. Software a handful of staff use internally costs less than something thousands of customers touch, where the bar for design, performance, and reliability is far higher.
A rough self-assessment: a focused tool doing one job sits at the low end, a multi-process internal system in the middle, a customer-facing platform with many integrations at the top.
The cost people forget
The build is a one-off expense. The software then needs hosting, maintenance, and changes as your business shifts, and that running cost is real and ongoing. A partner who quotes only the build and goes quiet on the upkeep is setting you up for a surprise. Budget for the life of the software, not just the day it launches.
How to keep the number under control
The biggest lever on cost is your own discipline about scope. The way we keep a build affordable:
- Start with the smallest version that does the job. Build the core that earns its keep, ship it, and let it prove its value before you extend.
- Sequence by return, not by wishlist. Build the part that saves or earns the most first, so the project pays you back while the rest is still being built.
- Resist “while we’re at it.” Most overruns are a series of small, reasonable-sounding additions. Park them, and add them later only if they still matter.
That discipline is what separates a build that pays for itself early from one that swallows budget before it has earned a penny. You can see how we package and price this work on our custom software pricing page.
A note on the cheapest quote
If you’re collecting quotes, be wary of the lowest one. Custom software that’s underpriced is usually underscoped, and the gap reappears later as change requests, or as a system that doesn’t quite do the job. The useful comparison isn’t the headline figure, it’s what each quote actually includes, and whether the partner was honest about the running cost and the things that will go wrong along the way.
If you’ve got a project in mind and want a grounded sense of the cost before you commit, tell us what you’re trying to build and we’ll give you an honest range and the reasoning behind it.
Written by
Alex
CEO
I’m a software developer and CEO of Digital Royalty, helping growing teams scale their SaaS platforms without losing quality, visibility, or control. I focus on building structured, maintainable systems with clear processes, reporting, and accountability. With over a decade of experience across agency and in-house roles, I specialise in delivering long-term, scalable solutions that support complex, evolving products.
