Not all S/4HANA migrations are equal. We break down the three migration approaches, their trade-offs, and which industries benefit most from each approach.
The Three Paths to SAP S/4HANA
One of the most critical decisions in any S/4HANA journey is choosing the right migration approach. SAP offers three distinct paths, each with different implications for cost, risk, timeline, and business transformation potential.
Greenfield: Start Fresh
A Greenfield implementation treats S/4HANA as a brand new system. You define new business processes from scratch, adopt SAP best practices, and move only the necessary master data and open transactions from the old system.
Best For:
- Companies with heavily customized ECC systems that want to modernize processes
- Organizations undergoing significant business transformation or M&A activity
- Companies wanting to fully leverage SAP's Intelligent Enterprise capabilities
- Subsidiaries or regional rollouts where the parent has a greenfield template
Trade-offs:
- Longest timeline: typically 15–24 months for complex enterprises
- Highest change management effort — users are learning new processes
- Historical data remains in the old system (archived)
- Greatest business transformation potential
Brownfield: System Conversion
A Brownfield conversion takes your existing ECC system and converts it to S/4HANA. All historical data, customizations, and configurations are retained. This is technically a database migration and code remediation exercise.
Best For:
- Companies that need historical data continuity (e.g., legal, audit requirements)
- Enterprises with well-optimized processes they don't want to redesign
- Organizations with tight timelines (6–12 months possible)
- Industries with heavy regulatory requirements
Trade-offs:
- Custom code must be remediated — can be expensive for heavily customized systems
- You bring old processes and technical debt into the new system
- Less transformation value compared to Greenfield
- Historical data is preserved but may slow system performance
Selective Data Transition
Selective Data Transition (SDT) is a hybrid approach where you create a new S/4HANA system but selectively migrate data from the old system — only the entities, company codes, or time periods you need.
Best For:
- Large multinational enterprises with multiple company codes or business units
- Companies that want clean processes but need selective historical data
- Enterprises using M&A as a catalyst for consolidation
- Organizations wanting to sunset legacy company codes or entities
Decision Framework: Which Approach Is Right for You?
| Factor | Greenfield | Brownfield | SDT |
|---|---|---|---|
| Timeline | 15–24 months | 6–12 months | 12–18 months |
| Cost | High | Medium | High |
| Historical Data | Not migrated | Fully retained | Selective |
| Transformation Value | Highest | Medium | High |
| Change Management | High | Low–Medium | Medium–High |
SAVIC's Recommendation
Based on our experience with 125+ S/4HANA implementations, SAVIC recommends a structured assessment before committing to any approach. The right path depends on your custom code volume, data architecture, business transformation goals, and timeline constraints.
Whichever path you choose, plan for what comes after go-live too — our SAP Basis managed services team keeps the new S/4HANA landscape stable, monitored, and optimised once the migration project closes.
Contact SAVIC for a complimentary migration approach assessment — we'll evaluate your current landscape and recommend the optimal path with a high-level business case.
