Turf & soil

Topsoil depths, ground prep, when to lay turf, BS 3882 quality grades.

All guides

Stub — growing

Last reviewed 20 May 2026

1 source

Regulations

Topsoil sold for landscaping should comply with BS 3882, which sets multipurpose, low-fertility and reduced-fertility grades. ^[1]

Hints & tips

Turf: 100 mm of cultivated topsoil, raked and rolled to a firm bed. Lay within 24 hours of delivery.
Shrub borders: 150 mm topsoil minimum; trees: 300 mm+ across the planting pit.
Lay turf September–October or March–April. Avoid mid-summer unless you can water daily for 4 weeks.
Bulking factor for as-dug clay: a tonne is ~0.6 m³ loose. Heavy clay needs a sand-and-grit improver before turfing or it puddles.
Sandy soils drain fast but hold few nutrients — incorporate 50 mm of compost into the top 150 mm before laying turf.
On slopes steeper than 1:6, lay turf across the fall and peg every roll for the first month — otherwise rolls slip before they root.

This app provides general UK guidance and material estimates only. It is not legal, planning, engineering or building-control advice. Always confirm requirements with your local planning authority, building control, utility providers, manufacturers or qualified professionals.