Customisation Costs in ERP Pricing
ERP systems promise efficiency, integration and insight. But for many businesses, the real shock comes after the software has been picked: the cost of making it fit. Customisation—the process of modifying an ERP system beyond its standard settings—can drain budgets, delay launches and create ongoing technical debt.
This article breaks down where those customisation costs come from, why they escalate quickly, and how companies can keep them under control.
Why ERP Customisation Drives Up Costs
Most ERP systems are designed to serve a wide range of industries. They come packed with features, but no system is built specifically for your business. So when your workflows don’t quite fit, the temptation is to change the system—rather than the process. That’s where the costs begin to mount.
1. Development Time and Resources
ERP customisations usually involve code changes or bespoke functionality. These aren’t quick fixes. Developers charge by the hour, often at rates upwards of £100/hour. A seemingly simple feature tweak can end up costing thousands once you factor in design, testing, and deployment.
Worse, the more your system drifts from the original product, the more dependent you become on the original vendor or third-party consultants.
2. Implementation Delays
Every custom request adds extra work—and complexity. That often pushes back go-live dates. Missed milestones can trigger contract extensions, ramp up consultancy fees, and tie up internal teams longer than expected.
Projects that start lean often spiral once stakeholders ask for “just one more thing.” Without a clear scope and change control process, the budget slips fast.
3. Long-Term Maintenance and Upgrades
Customisation doesn’t end at go-live. Every ERP update or vendor patch must be tested against your custom code. That adds overhead, especially if you’ve modified core functionality. Some updates may even break existing custom features, forcing rework or delaying critical patches.
Custom-heavy systems become harder to scale, harder to maintain, and risk being left behind on outdated versions.
4. Training, Documentation and Support
When you customise a system, standard training materials often go out the window. You’ll need to build your own documentation, create custom workflows, and deliver tailored training sessions—especially for new starters.
Support also gets trickier. Helpdesk teams may struggle to diagnose problems when the system behaves differently from the standard version.
Configuration vs Customisation: What’s the Difference?
Before going down the custom route, it’s important to distinguish between configuration and customisation.
- Configuration uses built-in tools to adjust settings (e.g. user roles, approval flows, tax rules). It’s flexible and low-risk.
- Customisation goes deeper. It involves changing the code, creating new modules, or altering how core functions behave. That’s where things get expensive.
Always push for configuration first. It keeps costs down, simplifies upgrades, and preserves vendor support.
How to Reduce ERP Customisation Costs
Here are five strategies to limit the financial and operational burden of ERP customisation:
1. Align Processes to the ERP, Not the Other Way Around
Look at whether your current processes are worth preserving. Many ERP systems reflect modern best practices—so if your process is the outlier, consider adapting. Avoid rebuilding inefficient legacy workflows just because “that’s how we’ve always done it.”
2. Prioritise Must-Haves
Not every user request deserves a custom solution. Focus on features that impact compliance, core operations or customer experience. Set clear boundaries and hold a line against unnecessary changes.
3. Get Vendors Involved Early
Involve implementation partners from the planning stage. They can often suggest ways to achieve your goals using built-in features or simple configurations. They’ve seen what works—and what turns into a maintenance nightmare.
4. Budget for the Full Lifecycle
Customisation is never a one-off. Factor in the cost of documentation, testing, upgrade rework and long-term support. If a change adds permanent maintenance overhead, weigh the ROI carefully.
5. Document Everything
Maintain a record of every change. Include why it was done, who signed it off, and how it was tested. This becomes invaluable during audits, upgrades or when staff turnover hits.
When Customisation Makes Sense
There are times when customisation is justified—such as meeting legal requirements, integrating with essential third-party systems, or delivering a genuine competitive advantage. The key is to know the difference between strategic customisation and expensive distractions.
ERP systems should help your business evolve—not trap it in old ways of working. While some level of customisation is often needed, too much can derail your project and inflate costs for years to come.
If you treat ERP as a change project rather than a software install, you’re more likely to adapt your business where it makes sense—and avoid falling into the customisation trap.