An ERP decision touches finance, operations, HR, procurement and customer service. Make it wrong and you spend three years fighting the system; make it right and your team finally has one source of truth. Most mid-market businesses make this decision once a decade. It deserves serious thought.
The three real options
- Tier-1 commercial ERP. SAP S/4HANA, Oracle NetSuite, Microsoft Dynamics. Industrial-strength, expensive, slow to implement.
- Open-source / mid-market ERP. Odoo, ERPNext, Tryton. Lower licence cost, configurable, requires implementation partner.
- Custom-built ERP. Tailored to your operations from day one. Most expensive in year one, often cheapest over five years for non-standard businesses.
When off-the-shelf wins
- Your business model is standard for your industry.
- You can adapt your processes to the software rather than the other way around.
- You need certified compliance modules (tax, payroll, audit) in many countries.
- You expect to grow into multiple geographies fast.
When custom wins
- Your operations have a genuine differentiator — not just preferences.
- Off-the-shelf would require so much customisation that you are paying for both the licence and the dev work anyway.
- Your industry has no good vertical solution (specialty manufacturing, vertical logistics, regulated niches).
- You have the engineering capacity to maintain it over time.
The hybrid path most mid-market businesses end up taking
Start with Odoo or ERPNext for the standard modules (accounting, HR, basic CRM), then build custom modules on top for the parts that are differentiated — production planning, route optimisation, customer self-service portals. You get the speed of off-the-shelf with the flexibility of custom.
The implementation costs nobody quotes
- Data migration. 20-40% of total project cost on most implementations.
- Change management. Training, documentation, internal champions. Skip this and adoption collapses.
- Customisation. Every "small change" compounds. Track and budget aggressively.
- Integration. Your ERP needs to talk to eCommerce, payments, banking, courier (e.g., Delix Courier), tax. Each integration is its own project.
The decision rule that works
If your business is 80% standard for your industry, pick off-the-shelf and customise the last 20%. If your business is more differentiated than that, custom is cheaper in year three even if it is more expensive in year one.
The ERP that works is the one your team uses every day without complaint. Everything else is shelfware.
Our Business & ERP Solutions team works with mid-market businesses to scope the right blend — and we will tell you to buy off-the-shelf when that is the right call.
