# Build vs Buy:  Should You Build Custom Software?

Custom software gives you exactly what you need. Off-the-shelf gives you something that works today. This guide helps you make the right call for your business, budget, and timeline.

## Quick Take

Build custom software when the functionality is your competitive advantage or when no off-the-shelf product fits your core workflow without heavy customisation. Buy when the problem is well-understood, standardised, and not differentiating - accounting, CRM, email, project management. The hidden cost of building is ongoing maintenance; the hidden cost of buying is vendor lock-in and workarounds for features that do not quite fit.

## Signs You Might Be Facing This Decision

- You are using spreadsheets or manual processes for something that clearly needs a proper system.
- Your current SaaS tool works for 80% of your workflow but the other 20% is painful.
- You have been quoted a custom development price and are not sure if it is worth the investment.
- Your competitors have custom tooling that gives them an edge you cannot match with off-the-shelf.

## The Decision Framework

Answer these questions honestly. The right choice depends on your specific situation, not general rules.

### Is this functionality your competitive advantage?

**Yes → Build.** If the software IS your product or directly enables what makes you better than competitors, owning it gives you control, speed of iteration, and differentiation. **No → Buy.** If it is a supporting function (HR, accounting, email), buy the best tool available and focus your engineering effort on what matters.

### Does an off-the-shelf product cover at least 80% of your needs?

**Yes → Buy (probably).** Adapt your process to fit the tool rather than customising the tool to fit your process. The 20% gap is usually cheaper to work around than the cost of building and maintaining everything. **No → Build.** If you would need to heavily customise an off-the-shelf product, you end up with the worst of both worlds - vendor dependency AND custom code.

### Can you maintain custom software long-term?

**Yes → Build is viable.** You need developers on staff (or on retainer) to maintain, update, and fix custom software indefinitely. Factor in security patches, dependency updates, and feature requests. **No → Buy.** If you cannot afford ongoing engineering, custom software becomes a liability, not an asset.

### How urgently do you need it?

**Yesterday → Buy.** Off-the-shelf solutions are available immediately. Custom software takes months. If time-to-market is critical, start with a SaaS tool and plan a custom build for later if needed. **Can wait 3-6 months → Build is viable.** But be realistic about timelines - custom software projects typically take 1.5-2x the initial estimate.

## Hidden Costs Most People Miss

### Hidden Costs of Building

- Ongoing maintenance (security, updates, bugs)
- Infrastructure and hosting costs
- Developer turnover and knowledge loss
- Opportunity cost of engineering time
- Feature requests that never end

### Hidden Costs of Buying

- Vendor lock-in and data migration costs
- Annual price increases (SaaS creep)
- Workarounds for missing features
- Integration costs with other systems
- Loss of control when vendor changes direction

## When to Get Expert Input

- ✔ You are committing significant budget and need an independent assessment of build vs buy.
- ✔ You are non-technical and cannot evaluate vendor claims or development proposals objectively.
- ✔ You have already started building and suspect it is costing more than buying would have.
- ✔ You are outgrowing your current off-the-shelf tool and wondering if custom is the right next step.