Lomme (FR)


Façades of the dwellings to be deconstructed

Deconstruction of 16 Uranus design social dwellings in Lomme

The “Uranus” type of housing is typical of the social housing form of the 1970s. These types of dwellings are now considered to be thermal wastes, and no longer meet the current needs of the inhabitants of the metropolises. It was, therefore, necessary to replace them with new buildings. To deconstruct this 971 m² of housing, the owner Vilogia commissioned the consultancy Neo-Eco to carry out a diagnosis of the resources available on the site and to draw up a strategic circular economy plan in collaboration with Septalia. The main sources identified were concrete and building components


About the project:

Vilogia is the heir to the pioneering entrepreneurs of the North of France in the field of social housing and, 100 years later, is pursuing the same mission of providing housing for low-income workers in the heart of cities and employment areas. Today, Vilogia makes social housing a lever for urban regeneration and the creation of living areas, for economic dynamism and ecological transition, for the development of each individual and for living well together. Vilogia is a driving force in the social housing world and continues to be a living housing entrepreneur.

Today, Vilogia owns 77 000 dwellings, representing 160 000 tenants across France.

Septalia is the grouping of CDC habitat, maisons & cités and Vilogia. Septalia brings together and coordinates the human, technical and financial resources of its founders to accelerate housing construction and rehabilitation programmes in the region.

Neo-Eco is an environmental engineering consultancy specialising in the field of waste recovery and the creation of circular economy loops. The company has a recognised expertise in deconstruction strategy.

A first audit took place to observe the structure of the building and to quantify certain structural and finishing elements.

This audit made it possible to list the potential recovery channels available in the area for each of the materials in the building, and to determine the appropriate recovery channel, but also to study the methods of cleaning, storage and deconstruction. The construction techniques of the time (1978 in this case) make it difficult to deconstruct the building. Indeed, many components were contaminated by pollutants, such as lead or asbestos.

However, several elements have been identified as recoverable and/or deconstructable.

  • The deposit of 887.22 tonnes of concrete can be recycled into type 1 aggregates for structural concrete or aggregates for road techniques
  • The 87 tonnes of steel, such as radiators and railings, can be re-used after cleaning
  • The 4.15 tonnes of window glass can be recycled into flat glass
  • 1.69 tonnes of interior stairs are reusable
  • All porcelain (1.31 tonnes) is reusable
  • The tiles, covering certain walls, particularly in the bathrooms, can be re-used if properly removed.


The elements re-used during deconstruction will be sent to the various channels identified at regional level, and put up for sale as second-hand material on specialised platforms.

Digital Tools in the project:

The 3D scan was useful in particular to confirm the inventory of resources carried out by Neo-Eco. It also allowed us to return to the site without having to travel to confirm the state of degradation of the various materials, particularly in the secondary works. This tool could be particularly useful in the context of future Product-Equipment-Materials-Waste diagnostics, which will be mandatory since 1 January 2023, to carry out a rapid inventory without the diagnostician having to travel to each site and photograph each element manually. The point cloud will also allow the identification of resources, facilitating their sale on the second-hand market or on existing platforms. We also see a use for existing housing, where we could give virtual tours to future tenants of the dwellings. R-BIM: The R-BIM tool is of real interest to a social landlord such as Vilogia, as it enables it to calculate the amount of materials available in its stock. Moreover, the possibility of calculating the carbon impact and the carbon avoided by deconstruction is crucial in view of the new regulations in place involving the reduction of emissions from the building sector. All these data allow the landlord to define a strategy for the years to come, both for renovations and for new constructions.

During 3D-Scan by BIM-Y
3D-Scan capture: Aerial view (drone)

The R-BIM has been modelized based on the 3D-Scan. We had the opportunity to compare the outputs of the R-BIM model with our manual inventory.

R-BIM visual : reuse potential of the building


Project Info

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