The default advice for most startups and SMEs is "buy before you build". Use SaaS tools, avoid custom development costs, and move fast. This is sound advice — most of the time. But there are specific scenarios where continuing to rely on off-the-shelf software is the more expensive and operationally riskier choice.
This article gives you a practical decision framework — not a sales pitch for custom development — to help you make the right call for your business.
Start With the Case for SaaS
SaaS tools win on speed and upfront cost. You can be operational in hours, the vendor handles infrastructure and updates, and the risk of failure is low. For common business functions — email, accounting, HR, video conferencing — SaaS tools are almost always the right answer. The vendor has already solved problems you'd spend months building.
The break-even question only becomes relevant when SaaS tools stop fitting your needs and you start bending your processes around the software rather than the other way around.
Five Signals That Custom Software Is the Better Choice
1. Your Workflow Has Significant Proprietary Complexity
If your core operational process has logic that no off-the-shelf tool supports, and you've exhausted API customisation options, custom software is justified. Examples: a logistics company with proprietary routing algorithms, an insurance broker with unique underwriting rules, a manufacturer with complex multi-stage production tracking.
2. You're Paying for Multiple Tools to Do One Job
If your team is stitching together 4–6 different SaaS tools with Zapier to replicate a single workflow, you're paying for complexity and fragility. Each additional tool is a potential point of failure, a separate login, a separate support relationship, and a monthly fee. At a certain scale, a purpose-built solution is cheaper and far more reliable.
3. You're Approaching a Vendor's Pricing Cliff
SaaS pricing models often have sharp jumps between tiers. If you're nearing the threshold where your bill will double or triple, calculate the 3-year TCO of custom software versus the SaaS subscription. Custom development has high upfront cost but near-zero marginal cost per additional user.
4. The Data Belongs in Your Hands
For businesses where data is a core competitive asset, relying on a SaaS vendor for storage and processing creates risk. Vendor lock-in, data portability restrictions, pricing changes, and the possibility of acquisition or shutdown are real concerns. Custom software with infrastructure you control eliminates this dependency.
5. You Have a Repeatable Process That Could Become a Product
Some businesses build internal tools that solve problems so well that the tool itself becomes a revenue stream. If you're automating a process that other companies in your industry also struggle with, the internal tool could be productised into a B2B SaaS offering.
The Framework: Build vs Buy Decision Matrix
- Standard process + available SaaS = Buy
- Standard process + fragmented SaaS tools = Evaluate consolidation (Bitrix24, etc.)
- Unique process + no suitable SaaS = Build
- Unique process + expensive SaaS workaround = Build (calculate 3-year TCO)
- Data-sensitive process + SaaS dependency risk = Build
The Cost Reality of Custom Software
Custom software is not a one-time cost. It requires ongoing maintenance, hosting, security updates, and occasional feature development. Factor these into your TCO calculation:
- Initial build: typically €10,000 – €150,000 depending on scope
- Annual maintenance: typically 15–25% of the initial build cost
- Hosting: €50 – €500/month depending on scale
- Feature additions: billed separately as they arise
Rule of thumb: if your current SaaS costs + workaround inefficiencies add up to more than 30% of the custom build cost per year, custom software will pay for itself within 3–4 years.
How OBI Systems Approaches This Decision
When a client comes to us asking whether to build or buy, we start with a discovery session — mapping their current tools, workflows, and costs. We don't push custom development when a SaaS tool genuinely fits. But when the numbers and the workflow complexity point toward custom software, we design and build systems that grow with the business and aren't held hostage by vendor pricing.
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