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.
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.
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