The choice of materials for floor covering is affe...

The choice of materials for floor covering is affected by factors such as cost, endurance, noise insulation, comfort, and cleaning effort. Some types of flooring must not be installed below grade, including laminate and hardwood due to potential damage from moisture.

The sub-floor may be finished in a way that makes it usable without any extra work, see:

Earthen floor adobe or clay floors
Solid ground floor, cementitious levelling/wearing/granolithic screeds,
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