ERP: standard vs. custom
Custom ERP vs standard: the decision framework based on TCO and real processes
Published: February 19, 2026
Choosing an ERP is one of the highest-impact technology decisions for a mid-sized company. A wrong choice costs years of expensive customisations, processes adapted to the tool instead of the other way around, and inevitable migrations. This guide gives you the right framework.
When a standard ERP is the right choice
- When your business processes are standard in your sector: accounting, basic inventory management, billing, HR without complex structures.
- When the company has fewer than 50 employees and processes are relatively simple and not highly differentiated.
- When you have an internal technical team that can manage the standard ERP's configuration, maintenance, and updates.
- When the initial budget is very limited: a well-configured standard ERP can work well for the first 2-3 years of growth.
When a custom ERP makes more sense
- When your differentiating business processes don't fit the standard ERP's data model without customisations that cost more than building from scratch.
- When the sector has specific regulations (pharma, food, construction, financial services) that the standard ERP doesn't correctly model out of the box.
- When the ERP must integrate deeply with industrial systems, production machinery, legacy systems, or sector-specific proprietary platforms.
- When the business is in a high-innovation sector where the product change velocity exceeds the standard ERP's update velocity.
How to calculate the real 5-year TCO
- Standard ERP licences: sum the annual licence cost × 5 years. Include users, additional modules, and version updates.
- Customisation cost: standard ERPs frequently require €20,000–€150,000 in customisations to adapt company processes. This cost typically appears in year 1-2.
- Implementation consultancy cost: between 50% and 150% of licence costs in medium-complexity projects.
- Custom ERP: higher initial cost (typically €30,000–€150,000 for a mid-sized company), but no recurring licences, no version update costs, and full code ownership.
Signs it is already time to migrate from your standard ERP
- Your technical team spends more than 30% of their time maintaining ERP customisations instead of developing new features.
- Every standard ERP version update breaks existing customisations and requires weeks of repair.
- Users report still using Excel to complement what the ERP cannot do — more than 3 satellite spreadsheets is a critical signal.
- The standard ERP vendor announces end of support for your version or radically changes the pricing model.
Need to evaluate whether your current ERP makes sense or it is time for a custom system?