What is Build vs. Buy Decision?
The build vs.
The build vs. buy decision is the strategic choice between developing software in-house or purchasing/licensing existing solutions. It's one of the most consequential technology decisions because it determines how engineering resources are allocated.
Build when: the capability is a core differentiator, no adequate solution exists on the market, the cost of customizing a bought solution exceeds building, or you need full control over the technology.
Buy when: the capability is table-stakes (everyone needs it), excellent solutions exist, you lack the engineering capacity to build and maintain, or time-to-market matters more than customization.
Hidden costs of building: ongoing maintenance (20-30% of initial build cost per year), hiring and retaining talent, opportunity cost (engineers building commodity features instead of differentiators), and technical debt accumulation.
Hidden costs of buying: vendor lock-in, integration complexity, licensing costs that scale with usage, limited customization, and dependency on vendor's roadmap.
Why It Matters
The build vs. buy decision is an R&D capital allocation decision. Building commodity features is one of the biggest wastes of engineering resources — it's the equivalent of a company manufacturing their own office furniture instead of buying it.
Frequently Asked Questions
When should you build vs. buy?
Build core differentiators. Buy everything else. The test: would customers choose your product because of this capability? If yes, build. If no, buy.
What are the hidden costs of building?
Annual maintenance (20-30% of build cost), talent acquisition and retention, opportunity cost (engineers on commodity work), and technical debt that accumulates over time.
Related Terms
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Richard Ewing is a Product Economist and AI Capital Auditor. He helps companies translate technical complexity into financial clarity.
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