The Barracks of Reuilly


  • Building Type : Other building
  • Construction Year : 1847
  • Delivery year : 2020
  • Address 1 - street : 20 rue de Reuilly 75012 PARIS, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 39 000 m2
  • Construction/refurbishment cost : 170 000 000 €
  • Cost/m2 : 4358.97 €/m2
  • Primary energy need :
    50 kWhep/
    (Calculation method : RT 2012 )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building

The transformation of the Caserne de Reuilly, supported by Paris Habitat, stems from the desire to rehabilitate and densify this site, by responding to the need to change an existing heritage, to seize its intrinsic qualities and to open up this place to residents of the neighborhood. Nearly 600 rental units (social, intermediate and undecided) as well as a nursery, artists' studios and shops are organized around a public garden open to the district.

By taking advantage of the main characteristics of this military architecture, a new urban form has emerged. The mineral square has become both a public garden and a place of passage, facilitating access between rue de Reuilly and boulevard Diderot, between housing and business premises. The transformation of the site, driven by re-use objectives, is accompanied by an imperative to preserve and rehabilitate the existing ones, instilling new uses within a reprogrammed military complex.

This project is the result of a long collaborative effort between Paris Habitat, h2o architectes (for the coordination and project management of public spaces), and 6 international teams of architects: Lin-A and Camille Salomon (lot A ), Anyoji-Beltrando (lot B), Charles-Henri Tachon (lot B1), NP2F – OFFICE (lot C), Mir (lots D and F) and Lacroix-Chessex (lot F).

Lot A (Lin-A and Camille Salomon) includes the rehabilitation of the left wing of the barracks and the construction of three new buildings for the creation of 91 social housing units, the Paris Habitat guards' lodge, a residence of 129 student housing units managed by the CROUS, accommodation for the CROUS caretaker, 1,230 m² of shops and local services, with the installation of roofs accessible and operated by the Quartier maraîcher association.
This lot, particularly dense and representative of the specificities specific to the overall operation carried out on the site of the Reuilly barracks, is used as a reference for this case study to deal with energy, environment and circular economy issues in housing spaces. Public spaces are also treated to show the possibilities of resorting to the reuse of materials in different contexts and at different scales.

See more details about this project

Photo credit

Urban coordination and landscaping: prod, Stéphane Chalmeau
Lin-A and Camille Salomon (lot A): David Boureau
Anyoji-Beltrando (batch B): Anyoji-Beltrando
Charles-Henri Tachon (lot B1): Simone Bossi
NP2F - OFFICE (lot C): Salem Mostefaoui
Mir (lots D and E): Hélène Huet
Lacroix-Chessex (lot F): Olivier Di Giambattista, Joel Tettamanti


    Paris Habitat


Construction Manager

    h2o architectes

    Jean-Jacques Hubert - contact[a]



    Lin-A et Camille Salomon


    Architect of Lot A

    Environmental consultancy

    Rotor Déconstruction


    Deconstruction and reuse

    Environmental consultancy

    Ajir Environnement

    [email protected]

    Environmental studies and consulting

    Environmental consultancy

    D&H Paysages



    Other consultancy agency



    VRD design office

    Environmental consultancy


    Fabien Matinier - fmatinier[a]

    Design, construction and maintenance of green spaces

    Environmental consultancy

    Agence On


    Light design

Contracting method

Other methods

Energy consumption

  • 50,00 kWhep/
  • RT 2012

    Primary energy consumption building family housing A1: 45.6 kWh/m²/year
    Energy consumption primary family housing building A2: 44.60 kWh/m²/year
    Primary energy consumption in the A3 student residence building: 71.80 kWh/m²/year
    Primary energy consumption of rehabilitated AE building: 70.04 kWh/m²/year

    Bbio family housing building A1: 42.70
    Bbio family housing building A2: 43.90
    Bbio A3 student residence building: 46.3

    New buildings: RT 2012
    The calculations were carried out with the CLIMAWIN software (version of March 14, 2016) which uses version of the CSTB RT2012 calculation engine.

    Rehabilitated building: existing RT
    The calculations were carried out with the CLIMAWIN software (4.3 version of March 14, 2016) which uses a real-time calculation mode of CSTB's Existing RT calculation


    • Condensing gas boiler
    • Heat pump
    • Heat pump
    • No cooling system
    • Natural ventilation
    • No renewable energy systems

    A boiler for heating and a gray water heat pump for domestic hot water have been installed.

    Condensing boiler :
    Pn= 80kW x 2
    Intermediate power: 27 kW
    η partial load=107.7%
    Standstill losses: 246 W
    Electrical consumption of auxiliaries: 85 W

    HP on gray water:
    Number of exchange element: 160
    Decanter volume: 382 l
    Exchanger volume 8350 l

    A boiler for heating and a gray water heat pump for domestic hot water have been installed. Only gray water is recovered.
    Condensing boiler :
    • Pn= 225kW x 2
    • Intermediate power: 67.5 kW
    • η100%=98%
    • η partial load=108.2%
    • Standstill losses: 340 W
    • Electrical consumption of auxiliaries: 340 W

    HP on gray water:
    • number of exchange elements: 160
    • Decanter volume: 382 l
    • Exchanger volume 8350 l

Water management

    NORMAL ABATEMENT (orange zone in the local urban plan of Paris)
    ROOFS: Rainwater reduction of 16 millimeters (excluding existing) 60.46%
    ROOFS: Reduction of rainwater by 8 millimeters (excluding existing) 56.8%
    • By green roofs 30 cm of substrate 282m²
    • By planted containers 70cm of substrate 77m²

    OPEN LAND: Rainwater reduction of 8 millimeters 100%
    • By open land green spaces garden 423m²
    o Retention valley in landscaped garden: 303m²
    • By grass cobblestones 283m²
    • Mineral open spaces: 359m²

Construction and exploitation costs

  • 104 800 000

Urban environment

The development of a public garden within the Reuilly barracks is part of the larger project to transform and densify the site. This new public space participates in the opening of the former military site towards the district, stretching to the feet of the housing in a continuity between landscape and architecture. By opening up the former 'place d'armes' to its environment, the urban and landscaping allows to regain permeability with the city, but also to revitalize the ground floors on the street, occupied by shops or business premises. The barracks becomes a place open to the neighborhood, visited and crossed by a large public. The mineral plots created on the three lanes bordering the plot open access to the central garden. Their mineral treatment in reused pavers incorporates grassed joints and planted or existing trees. Very wooded, the public garden continues this pavement to promote crossing routes. Its undulations on the ground create a shifting topography that multiplies the uses and puts the accommodation on the ground floor, equipped with planted valleys, at a distance. A continuum of grass, flowers and scents accommodates a diversity of uses and audiences. The programming of the garden has been refined with local residents and future residents, with tailor-made seats, games for children and vegetable garden areas.

Green space

4 800,00

Building Environmental Quality

  • biodiversity
  • works (including waste management)
  • comfort (visual, olfactive, thermal)
  • water management
  • energy efficiency
  • integration in the land
  • building process
  • products and materials

Reuse : same function or different function

    • Indoor joineries
    • Partitions
    • Plumbing
    • Landscaping


    • Lot inventory: 360 cast iron radiators (U)
    • Reuse objective: 183 cast iron radiators (U)
    • Reuse carried out in situ: 85 cast iron radiators (U)
    • “Loss” explanations: cracks in the radiators during removal (cleaning batch) and transport.
    • Area of use: cast iron radiator emitter system


    • Lot inventory: 138 large doors and 102 small doors
    • Objective of reuse: the cupboards of the apartments according to architects' plans
    • Reuse carried out in situ: 124 doors
    • Reuse to ex situ sectors (Zero Waste): 99 doors
    • Problems encountered: difference of a few centimeters between each apparently identical element. Adaptation of the complicated guidance system.
    • Area of use: finishing the doors of interior cupboards in housing

    INTERIOR JOINERY LOT – HPL PANELS (High Pressure Laminate)

    • Lot inventory: 92 panels (180m²)
    • Reused in situ: 56 panels for 12 stools, and 12 worktops for tables
    • Area of use: interior carpentry furniture


    • Lot inventory: 19 chairs
    • Reuse made from an external channel: 19 chairs
    • Area of use: interior carpentry furniture


    • Inventory of the lot: 512m3 of rubble from the demolition & existing rubble preserved
    • Reuse made from an in situ sector: 1032 m² of exposed rubble walls
    • Area of use: interior finishing of housing walls


    • Inventory of the lot: 3090m² in total of sandstone pavers
      • 1440 m² of cobblestones from the Reuilly barracks
      • 1650m² of pavers from different quarries
    • Field of use: paths and passages of outdoor facilities



    Lot inventory: existing steel gate
    Area of use: same function, adapted to the new public dimension of the former parade ground



    Lot inventory: 4,000 m² of roofing slate
    Area of use: mulch for landscaping



    Origin of the lot: all the existing buildings of the Reuilly barracks

    Cleaning work: ATD

    Reconditioning work: RADIASTYLE

    The removed radiators were returned to the site after being transported to the company specialising in the reconfiguration of cast iron radiators, which was responsible for storage in the workshop and delivery to the site after reconditioning.

    Area of use: plumbing.


    Re-use action: reconditioning, stripping, repainting, checking for leaks, fitting, adding legs and fixings, calculating conversion (high temperature > low temperature) for the dimensioning of energy needs.

    • COST

    302 euros / radiator, including installation.

    This is significantly cheaper than buying a new or second-hand cast iron radiator. This is still a competitive price for equipment that is popular for its environmental and aesthetic qualities.




    Origin of the lot: existing LOT A building of the Reuilly barracks

    Cleaning work: ATD

    Reconditioning work: SICRA

    The cupboards were removed and stored on site for the duration of the work. A carpentry workshop was set up in the commercial shell to take over the surface treatment and carry out the inventory. The cupboards were installed by the joinery company, which proposed the new guidance system.

    Field of use: interior joinery


    Re-use action: inventory, hand stripping (sanding) of door surfaces, finishing varnish. Creation of a new wooden frame in MDF and implementation of a new sliding guide system (rollers + rails). Interior fitting of new cupboards.

    • COST

    Average cost: 137 euros / door or 1270 euros per set of cupboards.


    INTERIOR FURNITURE - HPL PANELS (High Pressure Laminate)


    Cleaning work: ATD

    Reconditioning work: RONDY FORESTIER

    The cupboards were removed and stored on site during the structural work.

    The joinery company RONDY FORESTIER then recovered the panels to carry out the cutting (digital milling machine) and assembly in the workshop.

    The furniture (stools and high tables) was delivered and assembled on site.

    12 stools

    8 high worktops 

    4 desk tops

    18 panels donated to Zero Waste

    Area of use: Interior joinery.


    The panels were used to make furniture for the common areas of the CROUS student residence, stools and high tables.

    Addition of a locksmithing batch to make the table bases.

    • COST

    Cost of a stool: 75 euros per seat




    Origin of the batch: existing of the barracks of Reuilly
    Reconditioning work: removal, cleaning and sawing




    Origin of the lot: existing Reuilly barracks
    Reconditioning work: dismantling, removal of the metal sheets that were obscuring the gate, sawing to reduce its height and replacement of the missing spikes




    Origin of the lot: existing Reuilly barracks
    Reconditioning work: the tiles, not very resistant and of poor quality, could no longer fulfil their function as roofing elements. They were therefore removed and crushed to be used as mulch in the green spaces.

Sustainable design

    See previous field.

    • Conservation of rubble shear walls in the existing building 1032m or 500m3
    • Reconstruction of the equipment for the areas to be filled with demolished rubble (12m3 of limestone, i.e. 24000kg)
    • Second-hand furniture: 19 colored seats from Rotor Déconstruction

    • Grid plan in the existing building allowing reversibility of use.
    • Sub-ceiling height 2.3 to 2.6m on the ground floor, R+1, R+2 floors.

Reproductibility and Innovation

    From the very first urban design workshops, a specific workshop was organised so that each member of the project management team could make proposals concerning the reuse of materials present on site. This meeting was followed by a project management assistance mission on reuse, carried out by Rotor and Ajir Environnement. In particular, they participated in drawing up an inventory of reusable elements and in sourcing resellers who would be able to recondition the materials if necessary.

    Reuse was not the subject of a specific batch. It was distilled throughout all the lots, throughout the design and construction phases, adapting to the specificities of the operations carried out by each of the designers. Although reuse was not specifically part of the project management contracts, this approach was nevertheless integrated into the other parameters constituting the architectural, landscape and usage quality of the operation. The recommendations were integrated into the DCE (CTTP, graphic documents).
    Prototypes for the transformation of materials present on the site were carried out before the start of the works.
    The companies were given precise descriptions and re-use sheets in their contracts.

    Here is a brief description of the process implemented by Rotor to integrate reuse into the transformation of the Reuilly barracks:
    "Firstly, we carry out a photographic and quantitative survey of the materials present on the site. This allows us to draw up an inventory of reusable elements. We look at what has reuse potential according to several criteria: possibility of dismantling, authorisation to remove according to the risks of exposure to asbestos and clean-up plans, known reuse market, etc. Some operators have existed for three generations and have developed highly specialised knowledge, material by material. Other components have no known re-use channel; it is then necessary to assess, according to their quantity and quality, whether it is worth exploring techniques for their specific reconditioning. We then propose an operational assessment, keeping the safest values. A study for each element, based on reconditioning prototypes, allows us to consider the feasibility. All these stages were brought together in a decision support document for the contracting authority.
    We set up an exhibition in the project house, in collaboration with the Parisian association 6e Continent, to help architects and companies to identify the elements to be reused. We presented seven components in a concrete way with booklets showing how to refurbish them, the list of existing dealers and actors who repair and clean, recondition, check the watertightness, complete the stock, etc. The designers then formulated intentions towards these materials."

    The publication De la caserne aux logements, Reuilly Paris 12e, from which Victor Meester's words, collected by Fanny Léglise, are taken, is one of the supports that allows a return on the experience of the transformation project of the Caserne de Reuilly.
    Rotor has also written a report on the results of its intervention in this operation. The innovation of our approach lies in the fact that we have established the verification of the prescriptions implemented at the end of the Reuilly barracks transformation project.  

    The use of reuse can raise questions - in terms of the efficiency of the cleaning/transformation/adaptation process of the elements to their new context, and in terms of sustainability - which we have had to face:

    • the question of durability arises in particular for the re-used radiators (although we took care to select, from the set of radiators deposited, those which did not present any significant pathologies);
    • the reuse of lighting fixtures may be limited by their inadequacy to current electrical standards;
    • remediation (asbestos and lead) can be costly (parquet strips, slates, gates, etc.)
    • the transport and storage of materials require a specific organisation to avoid impacting on the different phases of the site. Some elements had to be moved according to the progress of the work, or others, such as the paving stones, were transported to the City of Paris' maintenance and supply centre in Bonneuil-sur-Marne.

    Rotor was also involved in organising, as mentioned in the previous interview extract, an exhibition at the project house showing how elements present on site could be reused or reemployed for the implementation of the project.


    De la caserne aux logements, Reuilly Paris 12e. (pp. 331 – 332)
    Éditions du Pavillon de l’Arsenal, septembre 2021
    En partenariat avec Paris Habitat
    Sous la direction de Fanny Léglise, architecte, auteure, docteure en architecture
    Conception graphique : Building Paris

    • By batch sheets of reused materials allowing the monitoring and traceability of materials.
    • Monitoring of project management and project management.

    • On-site storage and flow management by companies responsible for reconditioning (workshop storage).

Economic assessment

  • 292 790
  • 1 %

Social economy

    • Insertion clauses provided for in the market. 24,142 hours for batch A and F.

Reasons for participating in the competition(s)

All of the operations carried out for the rehabilitation of the former Reuilly barracks – creation of housing, business premises and development of public spaces – respond to the desire to offer a second life to the existing. By fitting into the plan drawn by the buildings erected in 1847, our project makes it possible to preserve a trace of successive urban developments, but also to reintegrate certain elements, materials and plants present on site - punctually adapted or transformed to serve new uses. Before reusing, we seek to preserve, to show, expose and keep the essence of a context invested with new meaning through reprogramming.

Building candidate in the category

Bâtiments résidentiels / prix de la rénovation

Bâtiments résidentiels / prix de la rénovation

Trophées Bâtiments Circulaires 2022

 Circular Buildings Trophies 2022
 circular economy
 materials and solutions
 tertiary building
 cities and territories
 nature in the city

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