There's a quiet rule in tech: if you can buy it for the price of a couple of pints a week, buy it. Build only when the off-the-shelf option genuinely doesn't fit, or when the per-seat cost across your team has quietly become bigger than a one-off build would have been. Most owners get this wrong in one of two directions: they overbuild, or they keep stacking subscriptions for years past the point a small custom tool would have paid for itself.
Buy off the shelf when…
- The job is generic: transcribing meetings, summarising documents, writing first-draft copy, scheduling.
- You're one of thousands of businesses with the same need. Somebody has already built it, and they have a whole team improving it.
- You can be up and running this week, not this quarter.
- The total cost is under, say, £100 a month per seat. At that price, building anything yourself is almost always worse value.
Build something custom when…
- The process is genuinely specific to your business. Your quoting logic. Your scheduling rules. The way your trade does estimates.
- The data lives in places no off-the-shelf tool can reach: a job-management system from 2008, a folder of PDFs on a shared drive, a spreadsheet that runs half the company.
- You'd be paying per-seat fees for 20+ people to use a generic tool when a small, focused internal app would do the same job better.
- Three or four SaaS subscriptions have quietly grown into "the stack", and most of what they do could be one internal tool you actually own.
- It's a competitive advantage, not a chore. Something that makes you noticeably faster or better than the firm down the road.
A simple decision shortcut
Spend 30 minutes searching for an off-the-shelf tool that does what you want. If you find three or four credible options, buy one and move on. If after half an hour you can't find anything that fits, or if everything you find solves 60% of the problem and you're already paying for two of them, you've probably found a real candidate for a custom build.
What "build" really looks like for an SME
When I build for clients, it's almost never a giant project. It's a small, focused tool: one form, one dashboard, one workflow. Fixed scope, fixed price, usually around two weeks, from £2,500. The goal is something your team actually opens on a Monday morning, not a platform with a logo. If you'd rather start with an opinion before committing to a build, that's what the AI Audit is for.
If you're not sure which side of the line you're on, that's exactly the conversation the audit is designed for.