Most build-vs-buy discussions start with the wrong comparison.
A SaaS subscription costs X.
Custom development costs Y.
Pick the cheaper number.
That sounds reasonable, but it ignores the more important question:
Is this capability just supporting the business, or is it part of how the business competes?
That is the decision I would make first.
Buying Works Best for Commodity Capabilities
Some software is important without being strategically unique.
Think:
Payroll
Accounting
Email
Document storage
Basic CRM
Help desk
HR administration
These systems matter.
But for most companies, they are not where competitive advantage comes from.
In those cases, buying usually makes sense.
You get:
faster implementation,
a mature feature set,
existing integrations,
vendor-managed updates,
less infrastructure to maintain.
There is no advantage in rebuilding a problem that the market already solves well.
Building Makes More Sense When the Workflow Is the Advantage
The decision changes when the workflow itself is important.
Examples:
Custom pricing logic
Unique fulfillment workflow
Specialized customer onboarding
Proprietary matching/routing
Industry-specific automation
Operational decision systems
If the software directly supports how the company differentiates itself, control becomes more valuable.
This is where custom software can make sense.
But "custom" should not be the default answer.
It should be justified by the strategic value of ownership.
Cheap SaaS Can Create Expensive Workarounds
This is where cost comparisons often fail.
Suppose a SaaS platform handles 80% of the workflow.
The remaining 20% does not fit.
So the team creates workarounds.
SaaS Platform
↓
Spreadsheet
↓
Manual approval
↓
Automation tool
↓
Side database
↓
Custom report
The subscription may still look cheap.
But the business is now paying in:
employee time,
duplicate data entry,
errors,
coordination,
extra tools,
delayed decisions.
That cost rarely appears in the software budget.
It shows up operationally.
So when evaluating a platform, I would ask:
What work will people still have to do
because the software does not fit?
That answer matters as much as the subscription price.
Custom Software Has Hidden Costs Too
The opposite mistake is assuming a custom build solves everything.
Custom software gives you control.
It also gives you responsibility.
You own:
Development
Testing
Hosting
Security
Monitoring
Maintenance
Bug fixes
Upgrades
Documentation
Support
Future integrations
Technical debt
A custom system is not finished after version 1.
It becomes a product your company has to maintain.
That can be worth it.
But only if the capability creates enough value to justify long-term ownership.
A Useful Rule: Buy the Commodity, Build the Differentiator
This is the simplest framework I use.
Commodity capability
→ Buy
Differentiating capability
→ Consider building
Examples:
Payroll
→ Buy
Generic accounting
→ Buy
Standard CRM storage
→ Buy
Unique lead-routing logic
→ Build or customize
Proprietary fulfillment engine
→ Build
Unique pricing workflow
→ Build
But there is another option that is often better than either extreme.
The Hybrid Model Is Usually Underrated
You do not always need to choose between:
Buy everything
and:
Build everything
Sometimes the better architecture is:
Existing Platform
↓
Custom Integration / Workflow Layer
↓
Unique Business Logic
For example:
Use a mature CRM for contact and pipeline management.
Build a custom service for your unique qualification or routing logic.
Use an existing accounting system.
Build a custom operational dashboard.
Use an e-commerce platform.
Build the fulfillment engine that makes your business different.
This gives you the benefit of established software without forcing your unique workflow into a generic model.
Ask What the Platform Forces You to Change
A useful question is not:
"Can this platform technically do what we need?"
Most enterprise platforms can technically do a lot.
Ask:
"What do we have to change about our business to make this platform work?"
Sometimes changing the process is good.
Your workflow may be unnecessarily complicated.
A mature platform may force useful standardization.
But if the process you are removing is part of your advantage, that trade-off matters.
Think About Data Before You Commit
Data portability often gets discussed too late.
Before deeply adopting a platform, ask:
Can we export all of our data?
Is the API sufficient?
Can we access historical records?
Who owns derived data?
What happens if pricing changes?
How difficult would migration be?
Vendor lock-in is not automatically bad.
Sometimes a platform provides enough value that dependency is completely reasonable.
But lock-in should be intentional.
It should not be discovered after five years of integrations and custom workflows.
Sometimes Buy First, Then Build
There is another pattern I like:
Buy
→ Operate
→ Learn
→ Reassess
→ Build only if justified
This is useful when the business is still learning its workflow.
Building custom software too early can be expensive because the team may not actually know the final requirements.
An off-the-shelf platform can help reveal:
which workflows are real,
which exceptions occur frequently,
what users actually need,
where operational friction appears.
Then, if custom software is still justified, you are building from evidence instead of assumptions.
Compare Total Cost of Ownership
Do not compare only:
Subscription
vs
Development estimate
Compare the full cost.
For buying:
Subscription
Implementation
Integrations
User pricing
Training
Customizations
Manual workarounds
Migration risk
Future price increases
For building:
Discovery
Development
Testing
Infrastructure
Security
Monitoring
Maintenance
Support
Future features
Technical debt
Then add one category that both sides often ignore:
Operational friction
How much human effort will the system create every week?
That is part of the cost.
A Practical Build-vs-Buy Checklist
Before making the decision, I would ask:
[ ] Is this capability standard or strategic?
[ ] Does an existing platform cover most of the need?
[ ] What important workflows would not fit?
[ ] What manual workarounds would remain?
[ ] How important is full control?
[ ] How quickly do we need the capability?
[ ] How important is data portability?
[ ] What integration complexity exists?
[ ] What does long-term maintenance look like?
[ ] How difficult would switching be later?
[ ] Could a hybrid solution work better?
That usually creates a much better decision than comparing two price tags.
The Real Question Is Ownership
Build vs buy sounds like a technical decision.
It is mostly a strategic ownership decision.
Ask:
What should we own because it creates advantage?
What should we rent because it is already solved?
If a capability is standard, buying is usually the better move.
If it is central to how the company competes, building may make sense.
If most of the capability is standard but one part is unique, a hybrid model is often the strongest option.
The goal is not maximum customization.
The goal is the right amount of ownership.
Top comments (1)
The "what work will people still have to do because the software doesnt fit" question is the one i wish i asked earlier. We bought a cheap help desk tool and ended up with a spreadsheet next to it for refunds, which nobody counted as a cost until it was eating an hour a day. Do you have a rough threshold where the workaround cost tells you its time to build the missing 20%?