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The COS, or Coefficient of Land Use, designates a ratio between authorized construction and the surface area of ​​a building land. How to understand COS, and what are its latest updates in 2014?

COS (Coefficient of Land Use)

COS (Coefficient of Land Use)

How to interpret the COS?

Originally, COS was called "land use coefficient". This device was created for avoid too much population density.

COS is different from one area of ​​the commune to another. A coefficient of 1 means that the entire land can be used for construction. A COS of 0.4 indicates that one can use 400 m² of floor space on a building plot of 1000 m². In an area composed of buildings for example, the COS may be greater than 1.

Where to find the COS applicable to a particular field?

COS is generally used in a Local Urban Plan (PLU). The PLU is an urban planning document that sets rules and objectives for the development of a municipality. Among other things, it provides for zoning and criteria to be respected in terms of urban planning and architecture.

The planning document can also be a POS (Plan of Occupation of Soils, older version of the PLU) or a communal map. To know the COS that applies to your situation, consult the urban planning document of your municipality.

Coefficient of Land Use: a programmed end

In 2014, the ALUR law (Access to Housing and Renovated Town Planning) puts an end to COS in many cases. For municipalities that already use a PLU at the time of the entry into force of the ALUR law on March 26, 2014, the COS no longer has to be.

On the other hand, for communities still using a POS and planning to transform it into PLU, it will be possible to keep the COS or to delete it. For that, it will be necessary to respect certain deadlines: to choose to adopt a PLU before December 2015, and to set it up on March 27, 2017 at the latest.

For your construction project to comply with the regulations, please contact your town hall. You will be able to know in what measures the coveted ground is constructible, to obtain your building permit in the best conditions.

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