The detailed guide below is currently available in English.
How deep should new topsoil be?
Four inches over an existing lawn is the classic recipe for leveling and refreshing grass — deep enough to feed roots, shallow enough not to smother them. Patchy or clay-heavy ground benefits from six inches of good loam, while raised vegetable beds want eight to twelve. Whatever the target, loose delivery settles, so the spread height shrinks by about a quarter over the first few weeks of rain and foot traffic.
Yards, tons, and the bag question
Suppliers sell by the cubic yard; some quote weight, which lands near 1.25 tons per yard for loose screened soil. Bags are the other route: a 40-pound bag holds roughly 0.375 cubic feet, so a single cubic yard is about 72 of them. That arithmetic settles the bags-versus-bulk debate fast — bags make sense for a bare patch or a small bed, and anything past twenty or thirty of them is cheaper, cleaner, and far easier on your back as a bulk delivery.
Repères pour la France
Repères locaux pour la France, utiles dans les calculs du quotidien :
- TVA: 20 % en taux normal (5,5 % alimentaire, 10 % restauration) ; les prix sont TTC par loi.
- Monnaie & paiements: Euro (€) ; paiement sans contact et carte bancaire très répandus, virement SEPA instantané en développement.
- Unités & nombres: Système métrique ; virgule décimale et espace pour les milliers : 1 234,56 €.
- Santé: Carte Vitale ; l'Assurance Maladie rembourse en base ≈ 70 % des soins, le reste par mutuelle.
- Pourboire: Service compris : aucun pourboire obligatoire ; arrondir suffit.
Mis à jour : octobre 2026 · valeurs 2025, sources officielles ci-dessus.
Questions fréquentes
How much area does one cubic yard cover?
At a 4-inch depth, one yard spreads across about 80 square feet — a 9×9 patch. At 6 inches it covers roughly 54 square feet, and at 2 inches closer to 160.
Can I put topsoil straight over grass?
Up to about 2 inches, yes — the grass grows through. Deeper than that, remove the sod or till first, or the old lawn becomes a buried thatch layer that sheds water and roots.
Is screened topsoil worth it?
For lawns and beds, usually yes: screening removes rocks and clods so the soil spreads evenly and rakes flat. Fill-dirt-grade soil is fine for leveling subgrade, but put the screened material on top where the roots live.