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The 3-Hour Rule: When to Build vs. Buy Software
Product Engineering

The 3-Hour Rule: When to Build vs. Buy Software

5 min read

A startup founder in New Delhi once told me: "We're building our own CRM. The existing ones don't fit our needs."

Six months later: ₹12 lakhs spent, CRM still not finished, team burned out, using Excel spreadsheets.

The painful truth? They could've bought Pipedrive for ₹3,500/month and customized it in a weekend.

The 3-Hour Rule

Here's our framework at PaxGeek Solutions:

If you can't build a working prototype in 3 hours, you should probably buy it.

Not a perfect version. Not production-ready. Just something that demonstrates the core functionality.

When to Buy

Buy existing software when:

  • It's not your core business: CRM, accounting, project management
  • Industry standards exist: Email marketing, payment processing
  • Compliance matters: HR systems, legal documentation
  • Speed is critical: You need it working this month, not next year
  • Maintenance is complex: Security updates, server management

When to Build

Build custom software when:

  • It IS your core business: Your product differentiation depends on it
  • Existing solutions don't exist: You've genuinely searched and found nothing
  • Integration is key: You need deep integration with proprietary systems
  • Scale economics work: Building costs less than buying at your volume
  • Data control matters: Regulatory or competitive reasons

The Real Costs of Building

People forget to count:

  • Opportunity cost: What else could your team be building?
  • Maintenance: 20-40% of initial build cost annually
  • Updates: Technology changes fast
  • Support: Who fixes bugs at 2 AM?
  • Training: Custom software = custom training

A Real Example

Client needed an employee onboarding system. They considered:

Option A: Build Custom

  • Development: ₹8 lakhs (2 months)
  • Annual maintenance: ₹2 lakhs
  • Features: Exactly what they wanted
  • Risk: High (what if developer leaves?)

Option B: Buy & Customize

  • Software: ₹50,000/year (BambooHR)
  • Customization: ₹1.5 lakhs (one-time)
  • Features: 90% of what they wanted
  • Risk: Low (vendor handles updates)

They chose Option B. Saved ₹6.5 lakhs in year one. Got to market 6 weeks faster.

The Hybrid Approach

Sometimes the best answer is both:

  • Buy for 80% of functionality
  • Build custom integrations
  • Add unique features on top

Example: Use Stripe for payments (buy) + build custom invoice generation (build)

How to Decide

Run this checklist:

  1. Search for existing solutions (spend 2 hours minimum)
  2. Calculate total cost of building (be honest!)
  3. Compare with buying + customizing
  4. Consider time to market
  5. Ask: "Is this our competitive advantage?"

Need help deciding? We offer free software audit sessions. Email us at contact@paxgeek.com