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SaaS vs custom software: control, cost and margin

SaaS is excellent at commodity processes and poor at differentiating ones. The question is not which is better; it is which part of your operation is genuinely yours.

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Outcomes

Commodity processes belong in SaaS — payroll, accounting, email
Differentiating processes are worth owning
Subscription cost rises with success; build cost does not
Data portability is the real lock-in question
Integration quality often matters more than either choice

Problems this solves

Per-seat pricing punishes growth

Model the licence bill at your expected headcount in three years, not today's.

Roadmap dependency

With SaaS, features you need arrive when the vendor decides — or never.

Data lives elsewhere

Check export formats, API limits and residency before committing critical processes.

Realistic timeline

Week 1

Model three-year cost for both routes.

Week 2

Trial the leading SaaS option against your real process and data.

Weeks 3–4

Decide, and scope the first phase.

Build or buy

Buy something existing when

Standard needs, small teams, and speed to value

Build custom when

Specific workflows, heavy integration, or licence cost that scales badly

Many companies keep SaaS for commodity functions and build the operational core around it.

What moves the price

Seats and tiers

Feature gating often forces an upgrade for one required capability.

Integration and middleware

Connector subscriptions add a recurring line that is easy to overlook.

Customisation limits

Workarounds for missing features are paid in staff hours forever.

Where projects go wrong

Underestimating migration out

Ask for a real export before committing, not a documentation page.

Shadow spreadsheets

If teams still keep a sheet beside the tool, the tool does not fit.

FAQ

Questions buyers ask

Is custom always more expensive up front?+

Yes, almost always. The comparison only becomes interesting over three to five years.

Can we do both?+

Most of our clients do — packaged finance and a custom operational core.

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