| System cost estimates, retrofit situation | ||
| Item | Small System (1 cubic meter per day) four bedrooms | Large System (4 cubic meter per day) 16 bedrooms |
| System cost at site | $20,836.00 | $42,848.00 |
| Gravel foundation | $450.00 | $850.00 |
| Sewage connection | $450.00 | $900.00 |
| Water recycled to toilets | $250.00 | $2,500.00 |
| Water recycled to laundry | $220.00 | $350.00 |
| Weater heater for laundry | n/a | $1,400.00 |
| Water disposal piping budget | $910.00 | $1,400.00 |
| Recirculation piping & valve | $350.00 | $350.00 |
| Electrical connection | $350.00 | $850.00 |
| Commissioning labour | $400.00 | $600.00 |
| Total costs | $24,216.00 | $52,048.00 |
| Contingency | $2,905.92 | $6,245.76 |
| Total before taxes | $27,121.92 | $58,293.76 |