The calculation of a stacked floor

The stacked floor is a popular way of expanding the living space of a house. Static as well as aesthetic and practical aspects speak in favor of this. However, so that everything is right with the construction, certain dimensions and restrictions must be taken into account.

What exactly is a stacked floor?

A stacked floor is a floor that is staggered, i.e. arranged at an angle. Typically, all of its four outer walls set back a considerable distance from those of the house's floor area - the reduction in floor space in relation to the floor below can, however, also be limited to the relocation of individual walls.

  • Also read - stacked storey with flat roof
  • Also read - The floor plan of a stacked floor
  • Also read - The stacked storey as a (non-) full storey

Stacked floors are mainly built for the following reasons:

  • static restrictions when retrofitting
  • optical expansion of the architectural style
  • building regulations

If a house is to be given additional living space at a later date, but should not or cannot be expanded, a built-up stacked floor is often a sensible solution. Especially when the statics of the house do not allow an additional storey in the full area, a reduction in area is often imperative.

The reduction of the area can be an advantage from the outside. Because a house that tapers towards the top looks wider, more open and more dynamic from the street. Especially in combination with a flat roof, it also has a very modern, graphic touch.

The building law can be quite a troublemaker when planning your own home. The regulations of the local development plan often force the additional storey to be reduced in size so that the maximum number of storeys is adhered to. To do this, it must be ensured that the stacked storey is not counted as a full storey.

Calculation of the stacked storey for the rating as a non-full storey

If the stacked storey is not built as a full storey, it can outsmart the locally permitted maximum storey. When it is classified as a full storey and when it is not, it is not that easy to define in a general way. Because building law is a matter of the state and also at the municipal and building district level, separate regulations often apply again. In any case, you should carefully read the current regulations of the responsible building authority before planning your stacked storey.

Across the federal states, however, the following can roughly apply as a guide: If the area of the stacked storey is clear (i.e. the fully usable height of i.d.R. 2.30 meters) is less than two thirds of the gross area of the floor below, it is not considered a full floor.