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| Specification options: green roofsCapital costNet present value for 60 years | ||
| £/m2 | £/m2 | |
| Extensive green roofs | ||
| Sedum mat pre-grown 20-30mm substrate | 45 | 55 |
| Sedum pre-grown plug planting 75mm substrate | 33 | 42 |
| Intensive green roofs | ||
| Semi-intensive grass, herbaceous plants, 120–200mm substrate | 30 | 44 |
| Intensive low-lying shrubs and coppices, 150–250mm substrate | 35 | 51 |