How do I estimate app development costs?
Estimating app development costs accurately requires knowing three things: the scope of what you're building, the complexity of the technical requirements, and the day rates of the team you're working with.
UK app development costs range from £8,000 for the simplest projects to £300,000 or more for complex multi-platform applications with custom backends and integrations. Most mid-complexity apps fall between £25,000 and £75,000.
The problem with estimating before you've properly defined scope is that 49% of software projects face budget overruns, and poor requirements gathering is the leading cause of failure in 39% of cases. A developer estimating a vague brief will either quote conservatively and return with change requests, or quote broadly and build in contingency you'll pay for whether you need it or not. 78% of software projects experience scope creep: the uncontrolled expansion of what's being built that adds cost and time with every new requirement.
Getting a precise estimate used to require an expensive scoping phase, weeks of business analysis and specification writing before a line of code was written. Most founders couldn't afford it, so they went into development with incomplete briefs and paid the price later.
That's changed. A working prototype built in days gives any developer everything they need to estimate accurately: not just what you want to build, but how users will interact with it, where the complexity sits, and what the technical requirements actually are. Estimates from a working prototype are significantly more accurate than estimates from a written brief, and the cost of producing one is a fraction of what scope creep costs later.