The Coignet house, one of the first houses in the world to have been built in agglomerated concrete, fell into ruin;


Actu Seine-Saint-Denis


This house, designed with a revolutionary material at the time of its construction in 1853 and located in Saint-Denis (Seine-Saint-Denis), is the work of the Lyon industrialist François Coignet.

Former Coignet factory in Saint-Denis (Seine Saint Denis).

The house of the director of the former Coignet factory is one of the first buildings in the world to have been constructed in concrete (1853).

The process used by the in... #Heritage #MonumentHistorique 👉

— Monumentum (@MonumentumFr) July 3, 2022

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Three years of work

It's urgent.

The building has been abandoned for many years.

The facade is decrepit, there are no more windows, the humidity is everywhere.

"We can't go inside, it's too dangerous," explains Antoine-Marie Préaut, regional curator of historical monuments in Île-de-France.

The Regional Directorate of Cultural Affairs (DRAC) of Île-de-France would like this house, which is on the property of the Saria company, to be classified as a historical monument this year.

The process takes a year.

The renovation work could then take about three years.


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  • St Denis

  • Ile-de-France

  • Inheritance

  • Immovable