When constructing a building in most cases it is necessary to dig out foundations, basement or inspection areas. By raising the ground-floor level the depth of digging can be reduced. The residual earth is then easier to spread over the plot. This is called ‘closed ground balance’ in building technical terms.
An advantage of a closed ground balance is that it avoids the need to remove the earth, which seriously reduces both the stress on the environment and transport costs.
Alongside this it presents the opportunity to create a floating patio at ground floor level. Firstly this means less litter blown into the building. Secondly it reinforces the patio effect. Furthermore by shifting the earth the ground height over the plot is altered and can be more aesthetically attractive.