- Type of ownership
- Size of building to retrofit
- Owner apartment stock
- One owner who wants to retrofit more than one building
- Operation and maintenance
- Knowledge of the owner's technical team
- Input data quality and completeness
- Financial capacity
- Risk profile
- Project complexity(incl. Multiple Bldgs)
- Technical stakeholders
- Existing support
- Legal Environment / obligations
- Deconsolidation / debt constraint
- Tendering procedure
- Efficiency goals by steps
- Single / multi steps renovation
- ROI
- Comfort requirements
- Mutualization with other works
- Other constraints
- Financing constraint