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| The following are indicative costs for commercial schemes located in south-east England, current in first quarter 2006. | |
| Infiltration systems | |
| Standard pavings, 150 mm thick sub-base (not SUDS, comparison only) | £35-40/³¾2 |
| Permeable pavings, 250 mm crushed rock sub-base, disposal of spoil on site | £40-45/³¾2 |
| Permeable pavings, 350 mm crushed rock sub-base, disposal of spoil off site | £50-55/³¾2 |
| Land drainage, perforated pipes in trenches, granular fill | £30-45/³¾ |
| Soakaways, crushed rock soakaway, cover and cover slab, geotextile membrane and granular surround, excavation and disposal of soil off-site | £150-275/³¾3 |
| Swales; excavation and formation of swale channel to fall, 1m wide by 750 mm average deep; geo-textile membrane; vegetation | £75-100/³¾ |
| Retention systems | |
| Geocellular storage system; 500 mm thick storage blocks, perforated land drains in granular surround; sub-base; impermeable membrane; excavation and disposal of spoil off site (surface costs excluded) | £100-140/³¾2 |
| Vortex control valves | |
| Supply cost of valve and chamber ring only | £200 |
| Total cost of valve and inspection chamber | £2,000-2,700 |
| Control systems | Ìý |
| Bypass separator, about 7,000-litre capacity | £9,000-10,000 |
| Full retention separator, about 7,000-litre capacity | £15,000 |
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