Step 20 of 23
decision framework, hidden costs, vendor lock-in, opportunity cost
Build vs Buy vs Hire — สร้างเอง ซื้อสำเร็จรูป หรือจ้าง ตัดสินใจด้วยกรอบคำถาม
Every time your organization needs a new capability, you face the same choice: build it yourself, buy an existing solution, or hire someone to handle it.
This is not a technical decision. It is a business decision with four dimensions:
Diagram: Decision tree for choosing whether to build custom software, buy a SaaS product, or hire a team based on business needs.
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| Dimension | Build | Buy (SaaS / Vendor) | Hire (Agency / Contractor) |
|---|---|---|---|
| Uniqueness | High (custom to your needs) | Low (standardized for everyone) | Medium (customized, built by others) |
| Upfront cost | High (engineering time) | Low (monthly fee) | Medium (project fee) |
| Time to launch | Long (months) | Fast (days/weeks) | Medium (weeks/months) |
| Ongoing cost | Low-Medium (your team maintains) | Recurring (subscription) | Varies (depends on contract) |
| Control | Full control | Limited to vendor's features | Shared control |
| Maintenance burden | All on you | Vendor handles it | Depends on agreement |
Your need is genuinely unique. No existing product does what you need because your process is different from everyone else's. If your competitive advantage depends on this capability, building may be the only option.
You need full control. You cannot tolerate vendor limitations, downtime, or changes. Your core product requires it.
You have the team. Building requires skilled engineers who are available and interested. If you need to hire a team from scratch to build one feature, the calculus shifts.
The capability is not your differentiator. Email delivery, payment processing, file storage, customer support tools -- these are solved problems. Pay for the solution and spend your engineering talent on what makes you unique.
Speed matters. You need it next month, not next year. A SaaS product is available today. A build project takes months.
You want to avoid maintenance. Every system you build, you maintain. Every system you buy, the vendor maintains.
You need expertise you do not have. The agency has built this type of system before. Your team has not.
It is a one-time project. A website redesign, a data migration, an initial system setup. Not ongoing work that requires a permanent team.
You want to validate before committing. Hire an agency for a prototype, then decide whether to build a permanent team.
| Cost Category | Often Overlooked |
|---|---|
| Migration | Moving from one solution to another later is expensive |
| Training | Your team needs to learn whatever you choose |
| Integration | How does it connect to your existing systems? |
| Opportunity cost | What could your team have built instead? |
| Vendor lock-in | How hard is it to switch away later? |
| Internal maintenance | Custom-built software requires ongoing engineering attention |
Most organizations default to building (engineers like building) or buying (managers like speed). The right answer depends on the specific situation.
For each capability, ask: "Is this core to our competitive advantage? How fast do we need it? What does it cost over 3 years, not just 1? What happens if we need to change course?"
Build what differentiates you. Buy what does not. Hire for expertise gaps. Simple in theory, difficult in practice -- because it requires honest assessment of what actually makes your business unique.
