Should You Build or Buy Your Business Software? A Simple Rule to Decide

For years, building your own software was the expensive option. You needed developers, time and a budget most service businesses didn't have, so you paid the monthly fee and lived with whatever the platform let you do.

That's changed. With AI, building simple tools has become dramatically cheaper and faster. But that doesn't mean you should replace everything.

Replacing every tool you pay for would be ideology, not strategy. The goal is to have a clear reason for every decision.

The rule: complexity

The rule I use for every build-or-buy decision is complexity.

The more complex a service is, the more it does that's genuinely hard to replicate, and the more sensitive data it holds, the stronger the case for keeping it.

The simpler a service is, the more it does the same thing for everyone, and the more you're paying for branding rather than capability, the stronger the case for building it yourself.

What you should usually keep

A real CRM is a good example of something worth keeping. It manages client relationships, sends emails, handles segmentation and automation, tracks behavior, and sometimes handles invoicing. It's genuinely complex, and it holds personal data. Building your own means taking on that data risk and maintenance yourself, and for most service businesses it simply isn't worth it.

The same goes for community platforms. If you want to build a community, use something that already has the social features built in. What you control is what you deliver into it.

Payment processing, accounting and anything heavily regulated usually belong in this category too.

What you can often build

Your website is the clearest case for building. No two businesses have the same website, and no platform can make yours exactly right. Page builders give you someone else's structure with your logo on it, plus a monthly fee for the privilege.

Today a properly built website can run for around $200 a year, with free hosting and a site you can change any time, just by describing what you want to an AI. The same thinking applies to blogs, sales pages, simple checkout flows and, depending on what you sell, your online store.

Course platforms are another strong case. Many charge the same monthly fee whether you're teaching 10 students or 500. I built my own course platform in an afternoon, and I only pay for the infrastructure it runs on.

When switching isn't worth it

Building isn't automatically the cheaper option. Before you replace anything, look at the whole cost.

There's the cost to build it right, which isn't zero. There's the time to move your data and retrain your team. And there's the risk of breaking something in the middle of a busy season.

I once watched a business owner spend $30,000 migrating to a popular platform because he was told it would bring him more traffic. Six months later, he was out of business. The platform didn't save him, and a different platform wouldn't have either. Your success has very little to do with the platform.

So run the numbers over two or three years, not one. A build that costs more than a year of subscription fees can still be the right call if it saves you money every year after that and gives you control over your costs.

How to make the decision

For every tool you're considering replacing, answer four questions.

If a tool is simple, you only use part of it, and rebuilding would pay for itself within a reasonable time, build it. If it's complex, holds sensitive data, or switching would put the business at risk, keep it.

Frequently asked questions