Ground floor

The ground floor is where a building meets the street, the garden and the people arriving at its door. Unlike the typical floors above it, it carries the transition between outside and inside, so a lot of planning decisions pile up here: entrance lobby, stair hall, shops, sometimes a garden flat.

What makes a floor the ground floor?

Naming varies. In British usage the ground floor sits below the first floor; in American usage the same level is usually called the first floor. In Turkish practice, where it is called zemin kat, its position is tied to the level the building sits at and to how the zoning plan defines natural ground. On a sloping plot, a floor that reads as the ground floor on one side can behave like a basement on the other, and the plan notes decide which is which. Some projects lift the ground floor a few steps to keep it away from damp and street noise.

The ground floor often gets a taller floor-to-floor height than the levels above, especially when it holds retail or a lobby. It also collects the most structural load, so an open, column-light ground floor has to be agreed with the structural engineer early.

The ground floor in visualization

In eye-level exterior renders, the ground floor is what the viewer actually looks at. The entrance canopy, reflections in shopfront glass, the edge where paving meets planting and the evening lighting all sit here. If these feel thin, the image feels thin, however good the rest of the model is.