Build vs. Buy: A Framework for Making the Decision

Almost every business we work with has had this conversation at some point: "We are using [some SaaS tool] and it does 80% of what we need, but that last 20% is killing us." The question is always the same — do we keep forcing the square peg into the round hole, or do we build something that actually fits?

After having this conversation dozens of times, we have developed a simple framework for thinking it through. It is not a formula — there is no calculator that spits out the right answer — but it gives you a structured way to think about what is actually a complex decision with a lot of hidden costs on both sides.

When buying makes sense

The strongest argument for off-the-shelf software is that someone else has already solved the problem, and they are maintaining the solution for you. Security patches, compliance updates, new features — all handled by a team whose only job is to work on that product. If your needs are genuinely standard, there is no reason to re-invent the wheel.

Buying makes sense when:

• The core workflow is standard across your industry (invoicing, email marketing, basic CRM)
• Customization needs are limited to configuration, not code changes
• The vendor has a strong track record and is likely to be around in five years
• Switching costs are low — your data is exportable and the format is open
• The tool integrates well with your other systems

When building makes sense

The case for building gets stronger the more your business process diverges from what generic tools assume. If you are spending significant time working around your software — entering data in multiple places, maintaining side spreadsheets to track things the tool cannot, or manually performing steps that should be automated — the hidden cost of "buying" is much higher than the sticker price.

Building makes sense when:

• Your workflow is a competitive advantage and you cannot afford to use the same tool as everyone else
• You are spending more time working around the tool than working with it
• Integration with your existing systems requires extensive custom development anyway
• The off-the-shelf options are built for a different scale or industry than yours
• You need full control over the data model, business logic, and user experience

The hidden costs people miss

When buying: People underestimate the ongoing cost of workarounds. That "small manual step" the team does because the software cannot automate it? Multiply it by the number of times per day, the number of employees doing it, and the number of years you will be using the tool. Then add the cost of the errors that inevitably happen when humans do repetitive data entry. That 80/20 gap has a real dollar amount.

When building: People underestimate the ongoing cost of maintenance. Building the initial version is the easy part. Security patches, library updates, bug fixes, user requests, server costs, monitoring — someone has to do all of this for as long as the software exists. If you are not planning for this from the start, you are going to end up with a system that slowly rots until it becomes the next legacy problem.

The middle ground

In practice, the answer is often neither "build everything from scratch" nor "use the tool exactly as it comes." The most effective approach is often to use off-the-shelf tools for the commodity parts of your workflow and build custom software only for the parts where your business is genuinely different.

For example, one of our clients uses QuickBooks for accounting (standard, no reason to build that), Shopify for their online store (standard e-commerce), but we built a custom inventory management system because their warehouse workflow is unusual enough that no off-the-shelf tool handled it well. The custom system integrates with both QuickBooks and Shopify through APIs.

This approach gives you the best of both worlds: proven tools for the standard stuff, custom software for the parts that actually matter, and integrations to keep everything in sync.

Questions to ask yourself

Before making the decision, work through these questions with your team:

1. How much time per week does the team spend on workarounds for the current tool?
2. If we build, who will maintain it after launch? Is that person (or team) committed for the long term?
3. Is the process we are automating likely to change significantly in the next two years?
4. What is the actual cost of the current workarounds — including errors, delays, and employee frustration?
5. Can we start small? Build the one critical piece custom and keep everything else as-is?

If you are wrestling with this decision and want an outside perspective, we are happy to talk it through with you. We have helped plenty of companies navigate this and we will give you an honest assessment — including telling you if we think building is the wrong move for your situation.