How Much Does Custom Software Cost in 2026?

Custom software in the UK typically costs between £3,000 and £50,000+ depending on complexity. A simple automation or internal tool might run you £3,000–£8,000. A full custom web application with user accounts, dashboards, and integrations usually lands between £10,000–£30,000. Enterprise systems with multiple integrations and ongoing development start north of £30,000. The honest answer is that it depends — but unlike most agencies, we're going to tell you exactly what it depends on.

What affects the price

Four things drive the cost of custom software:

• **Complexity** — A single-purpose tool that does one thing well is cheaper than a system with ten interconnected features. Every additional screen, workflow, or user role adds time.
• **Integrations** — Connecting to your existing tools (accounting software, CRMs, email platforms) takes work. Some have great APIs. Some have APIs that look like they were built in 2003. The latter costs more.
• **Design** — Do you need a polished, branded experience that customers see? Or an internal tool where function beats beauty? Customer-facing work costs more because it has to look right on every device and pass the "would I trust this company?" test.
• **Ongoing maintenance** — Software isn't a painting you hang on the wall. It needs updates, security patches, and occasional fixes when something upstream changes. Budget for this from the start or you'll pay more later.

The three tiers

Most projects we see fall into one of three brackets:

• **Quick fixes (£500–£3,000)** — Bug fixes, small integrations, data cleanup, connecting two systems together. Usually done in days, not weeks. You've got a specific problem, and it just needs sorting.
• **Custom builds (£3,000–£30,000)** — Bespoke software built around your workflow. Internal dashboards, customer portals, booking systems, inventory management — things that off-the-shelf tools can't quite handle. These take weeks to a few months.
• **Ongoing partnerships (monthly retainer)** — Continuous development, maintenance, monitoring, and improvements. Best for businesses whose needs evolve and who want a technical team on call without hiring one.

Red flags to watch for

When you're getting quotes from developers or agencies, watch out for:

• **"It depends" with no follow-up** — Everyone starts with "it depends," but a good developer will then ask you twenty questions and give you a range. If they can't even ballpark it after a proper conversation, they either don't know or don't want to commit.
• **No fixed-price option** — Time-and-materials billing has its place, but if a studio won't offer any fixed pricing on a well-defined scope, that's a risk you're carrying, not them.
• **Scope creep by design** — Some agencies quote low to win the work, then charge for every small change. Get the scope in writing. Know what's included and what isn't.
• **No mention of maintenance** — If someone builds your software and disappears, you'll eventually need another developer to pick up the pieces. That's always more expensive than planned maintenance.

How to budget sensibly

The smartest approach is to start small and prove value before scaling up.

• **Phase 1: Pick your biggest pain point.** The one task that wastes the most time or causes the most errors. Build a solution for that first. Budget £3,000–£8,000.
• **Phase 2: Measure the impact.** Did it save time? Reduce errors? If yes, you now have evidence to justify further investment.
• **Phase 3: Expand.** Add features, connect more systems, build on what's working. This is where the £10,000–£30,000 range kicks in, but you're spending with confidence because Phase 1 proved the concept.

This is how you avoid the classic mistake of spending £30,000 on a system nobody ends up using.

What we charge

We're transparent about pricing because we think the industry should be. Our Quick Fix tier starts at £500 for small jobs. Custom Builds get a fixed quote after a free discovery call — no surprises, no hourly billing that spirals. Ongoing work is a monthly retainer that we agree upfront.

If you want a straight answer about what your project would cost, [get in touch](/contact). We'll tell you honestly — even if the honest answer is "you don't need us, use this free tool instead."