Build vs buy software: a decision framework for product teams
When to ship custom software, when to buy SaaS, and how to avoid the expensive middle ground of half-built internal tools.
Build vs buy is rarely a binary choice. Most teams need a portfolio: buy commodity workflows, build the workflows that create differentiation, and integrate the two with clear ownership.
Buy when the problem is well-understood industry-wide, switching costs are acceptable, and the vendor’s roadmap is faster than your team’s capacity. CRM, email, and payroll usually belong here.
Build when the workflow is your product, when data sensitivity or latency constraints rule out off-the-shelf tools, or when vendor lock-in would block a strategic bet.
Beware the expensive middle: internal tools that recreate SaaS features without the maintenance budget. If you cannot staff on-call, observability, and iteration, you are not really building — you are accruing debt.
Score decisions on five axes: differentiation, time-to-value, total cost of ownership, data control, and exit options. Write the score down before the vendor demo or the engineering estimate.
For custom builds, demand a maintainable MVP: auth, core workflow, auditability, and a path to production operations — not a prototype that dies after the first release.
Revisit the decision quarterly. Markets change, vendors ship features, and your differentiation may move. A buy decision today can become a build decision next year — and vice versa.
Novol helps teams make this call with founder-led scoping: we build selective custom products when buy is the wrong answer, and we say no when a SaaS purchase is the honest path.