The wrong build-versus-buy decision creates years of unnecessary cost. The right one is less about technical preference and more about whether the workflow is strategically important, repeatedly painful, and underserved by the tools available.
Buy the commodity
Use SaaS when the workflow is common, the market is mature, and the product already matches the team's operating reality. The cost of ownership and change should be lower than owning the system yourself.
Do not build a private version of a capability simply because the current configuration is inconvenient. First test better configuration, training, process change, or integration.
Build the differentiator
Custom software earns its place when the workflow is central to how the company creates value, the current tools force expensive workarounds, and the business needs behaviour or data ownership the market cannot provide.
The build should start with the smallest useful wedge, not a promise to replace every system. Preserve valuable systems and connect them where possible.
Integrate before replacing
Many decisions are not binary. A focused internal tool, API, workflow layer, or client portal can join existing systems without turning the company into a software vendor overnight.
Compare total operating cost, adoption, security, data ownership, change rate, and the team's ability to maintain the result before committing to a platform build.
