Build vs. Buy
The $500K Decision Framework
Building in-house gives control but costs 3–5x the initial estimate. Buying is faster but creates vendor lock-in. Here's the TCO framework.
📊 Scoring Matrix
3–12 months
1–4 weeks
$200K–$1M+ (development)
$12K–$100K (license)
$500K–$3M (build + maintain)
$50K–$500K (license + integration)
Unlimited
Limited to vendor roadmap
Scope creep, team dependency
Vendor lock-in, sunset risk
When the capability IS your product
When it's infrastructure
📋 Executive Summary
Build your differentiation. Buy your infrastructure. The line between them is where most CTOs make expensive mistakes.
The average build-vs-buy mistake costs $1.2M over 3 years. Most overruns come from underestimating maintenance costs: each custom system requires 20–30% of original build cost annually.
🎯 Decision Framework
- ✓ The capability is your core product differentiator
- ✓ You have >5 engineers available
- ✓ You need unlimited customization
- ✓ Vendor options don't exist for your use case
- ✓ It's commodity infrastructure (auth, payments, email)
- ✓ You need value in <4 weeks
- ✓ Your team is <5 engineers
- ✓ Multiple mature vendors exist
Decision matrix: Build if (core differentiator + >5 engineers + >12 months runway). Buy if (commodity capability + <5 engineers + need value in <4 weeks).
🌐 Market Context
The build-vs-buy equation has shifted dramatically in 2024–2025. With AI-augmented development, build costs are dropping 30–40%, but maintenance costs remain high. SaaS inflation (avg. 12% YoY price increases) makes buy decisions more expensive over time.
65% of companies report regretting major build decisions within 2 years. The top reason: underestimating ongoing maintenance.
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