Build vs Buy Software for Small Business: A Framework

The build vs buy software decision is one of the most expensive calls a small business owner makes — and it usually gets made on gut feel. Either someone signs up for another SaaS tool because it looked good on a landing page, or someone decides to "just build it" because SaaS feels like a money pit. Both are wrong about half the time.

Here is the honest framework we use when clients ask us whether they should buy something off the shelf or have us build it. It is the same framework we would use on our own business.

Start With a Simple Question: Is This a Standard Process?

Accounting is a standard process. Email is a standard process. Payroll is a standard process. If the thing you are trying to software-ize is the same across 90 percent of businesses in the world, buy it. QuickBooks, Gusto, Google Workspace — these exist because millions of companies need the exact same thing. There is no competitive advantage in building your own general ledger.

Your unique workflows are a different story. The way you route service calls, the way you price custom orders, the way you onboard new clients — if those things are genuinely specific to how your business wins, SaaS is going to fight you. That is where the custom vs SaaS conversation actually starts.

The 30 Percent Rule

Look at any SaaS product you are considering and honestly estimate what percentage of its features you will actually use. If you will use 30 percent or more, buy it. You are getting real value for the price, and the other 70 percent is just noise you can ignore.

If you will use less than 30 percent — and especially if the features you need are buried in the top-tier plan while you have to pay for eight things you do not need — you are subsidizing someone else's enterprise customers. That is a strong signal you should build.

Does Per-Seat Pricing Punish Your Growth?

Per-seat pricing was designed for software where every user is a revenue-generating knowledge worker. It stops making sense the moment you have field techs, warehouse staff, part-timers, contractors, or customers who need occasional access. A $50-per-seat CRM for a 20-person operation is $12,000 per year. Five years is $60,000. And it keeps growing as you do.

Custom software is a one-time build plus hosting. Hosting for a small business app typically runs $50 to $200 a month regardless of whether you have 5 users or 50. If your team is growing, or if a lot of people need light access, per-seat math eventually tips toward building.

Run the 3-to-5-Year Total Cost of Ownership Math

Most people compare a one-time build quote against one month of SaaS. That is not the comparison. The real comparison is total cost of ownership over 3 to 5 years, including the SaaS hidden costs nobody puts in the spreadsheet: integration work, data cleanup, duct-tape Zapier subscriptions, training, and the time your team spends working around limitations.

A simple example. Say you are looking at a $400-per-month SaaS tool plus $150 a month for a connector to make it talk to QuickBooks. Over five years that is $33,000. A focused custom build in the $12,000 to $18,000 range plus $100 a month for hosting comes in around $24,000 over the same window — and you own it. That math flips again if the SaaS truly fits; it is not always in custom's favor.

The point is to actually do the math with real numbers over a real time horizon instead of comparing a monthly subscription to a one-time invoice.

When SaaS Clearly Wins

Buy when the process is industry standard, the tool covers 30 percent or more of what you do, per-seat pricing is not an issue at your size, and switching costs are low if you outgrow it. Email, basic accounting, payroll, payment processing, most marketing tools, standard project management for a small team — these are not worth building.

When Custom Clearly Wins

Build when your workflow is genuinely unusual, you have tried two or three SaaS options and they each broke on the same thing, your team is doing heavy manual work around a SaaS tool's limitations, per-seat pricing is scaling faster than revenue, or you need systems to talk to each other in ways connectors cannot handle cleanly.

A good sanity check — if you already have a spreadsheet, an Airtable base, or a shared doc that is duct-taping around a SaaS tool, the custom version of that spreadsheet is usually a high-ROI build.

The Hybrid Answer Most Small Businesses Land On

The honest answer for most small businesses is not fully build or fully buy. It is buy the standard stuff — accounting, email, payments, payroll — and build the one or two workflows that are actually unique to how you operate. That is where custom software pays back fastest and where SaaS hurts you most.

If you want a second set of eyes on a specific decision, our technical consulting engagements are built for exactly this — looking at your stack, your workflows, and your costs, and giving you a straight answer on what to build, what to buy, and what to leave alone.