Custom ERP vs SAP Business One: What Mid-Size Companies Should Know
SAP Business One is the ERP many growing companies look at first. A custom ERP is the option they often overlook. Here is an honest comparison of cost, fit, implementation and long-term ownership.
By Alin at Artificially · · Technology
When a growing company outgrows spreadsheets and its accounting software, SAP Business One is often the first ERP on the shortlist. It is SAP's product for small and mid-size businesses, sold and implemented through a network of partners, and it covers the standard areas most companies need: finance, sales, purchasing, inventory and basic production.
A custom ERP is the option many companies do not consider until later — usually after an off-the-shelf implementation has become expensive to bend around their processes. This article compares the two honestly.
What SAP Business One does well
- Standard processes out of the box. If your finance, purchasing and inventory work like most companies', much of what you need already exists.
- Accounting and reporting conventions that auditors and accountants recognise.
- A partner ecosystem with add-ons for specific industries.
- A known brand, which matters to some boards and investors.
Where it gets harder
- Processes that do not fit. Every company has a few workflows that make it different. Adapting a standard ERP to them means customisation through partners, add-ons, or changing how your team works.
- Licences that grow with headcount. SAP Business One is licensed per user, so costs rise as more people need access.
- Dependency on the implementation partner for changes, upgrades and support.
- Integrations with e-commerce, warehouse, banking or industry-specific systems often require extra add-ons or development.
What a custom ERP looks like
A custom ERP is built around your actual workflows: only the modules you need, integrated with the systems you already use, with no per-user licence fees. In our experience a custom ERP typically costs 40,000–120,000 EUR over three years, including build and maintenance, and takes 3–6 months to a first release. You own the source code and can run it in your own cloud account.
The trade-offs are real: you do not get a ready-made ecosystem, and you need a reliable development partner or internal team for the long term.
Side-by-side
| Custom ERP | SAP Business One | |
|---|---|---|
| Fit to your processes | Built around them | Standard processes, customisation via partners and add-ons |
| Licensing | No per-user fees | Per-user licences |
| Time to first release | Typically 3–6 months | Depends on scope and partner |
| Integrations | Built to order | Standard connectors, add-ons or custom development |
| Ownership | You own the code | You licence the software |
| Ecosystem | None ready-made | Partner add-ons available |
When SAP Business One is the better choice
- Your processes are close to standard and you are happy to adapt the few that are not.
- You need statutory reporting in several countries quickly.
- Your user count will stay modest, so licences stay affordable.
- You value a recognised brand and a large partner network over flexibility.
When a custom ERP is the better choice
- Your operations — production, distribution, pricing, field work — are what make you competitive, and standard modules force workarounds.
- Many people need access, so per-user licences become a large recurring cost.
- You need deep integration with existing systems such as e-commerce, warehouse or industry software.
- You want to own the system and avoid lock-in to one vendor or partner.
The option most companies miss: hybrid
You do not have to replace everything. Many mid-size companies get the best value by keeping standard accounting software for finance and building custom modules only for the operational processes that make them different — inventory, production planning, pricing, field service — connected through APIs. It keeps compliance simple and puts development budget where it creates an advantage.
Questions to answer before deciding
- Which of your processes are genuinely unique, and which are standard accounting or HR?
- How many users will need access in three years, and what would licences cost at that size?
- Which systems must the ERP integrate with on day one?
- Who will own and maintain the system after launch?
For a broader comparison with SAP's enterprise products, see our Custom ERP vs SAP guide, or read about our approach to custom ERP development. If you would like a second opinion on your options, book a 15-minute call — we will tell you honestly if an off-the-shelf ERP is the better fit.
Need help with a similar project? Book a free 15-minute discovery call with Artificially.