Although you may buy good quality turf, it the top soil is substandard this can result in a substandard garden lawn. We have top soil which is safe, fertile, and consistent, and responsibly sourced and tested to comply with BS3882:2015.
At Rolawn, all of their top soils are Peat Free, which emphasises the environmental responsibility of their brand, ensuring the survival of carbon sinks and ecosystems of lowland peat bogs. Produced from a blend of silt, sand, and clay, all Rolawn top soils have high organic matter, and are easy to work with as they are already broken down. Try the Rolawn Soil Improver, if you have poor growing conditions for turf.
This depends on density, however a Rolawn 1m³ bulk bag, such as the Rolawn Soil Improver, weighs around 550kg, and covers 20m² at a Depth of 50mm. This is a sufficient depth for your lawn.