Réhabilitation rue de la Huchette

8417 Last modified by the author on 27/03/2017 - 10:41

Extension + refurbishment

  • Building Type : Collective housing < 50m
  • Construction Year : 2014
  • Delivery year : 2016
  • Address 1 - street : 18 rue de la Huchette 75005 PARIS, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 607 m2
  • Construction/refurbishment cost : 1 800 000 €
  • Number of Dwelling : 10 Dwelling
  • Cost/m2 : 2965.4 €/m2

Certifications :

  • Primary energy need
    78.9 kWhep/m2.an
    (Calculation method : RT 2005 )
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 rehabilitation and extension of an 18th century building housing 10 housing units in the heart of historic Paris raises the question of the transformation of an ancient structure and its adaptation to contemporary uses as well as to the normative criteria applied today To construction.

Sustainable development approach of the project owner

Respect of the City of Paris Climate Plan in rehabilitation.

Architectural description

The rehabilitation and extension of an 18th century building in the heart of a historic city raises the question of the transformation of an ancient work and its adaptation to contemporary uses. The architectural project, combining both rehabilitation and extension works, was guided by an ecological ambition and strong technical constraints. The method we have developed is between a method known as "Historic Monuments" and an environmental approach.

See more details about this project


    Other consultancy agency

    LM Ingénieur

    Laurent Mouly - 13, rue Chapon - 75003 Paris - Tél : 01 40 29 96 92

    Design, Structure, Thermal, Envelope

    Other consultancy agency


    Atelux - Conflans 13 Rue Clos d'en Haut 78700, Conflans-Sainte-Honorine - Tél :


    Fluid design office

Type of market


Energy consumption

  • 78,90 kWhep/m2.an
  • 130,00 kWhep/m2.an
  • RT 2005

    Heating: 49.0 DHW: 29.6 Lighting: 4.3 Auxiliary: 3.0

  • 278,90 kWhep/m2.an

Real final energy consumption

    73,80 kWhef/m2.an

Envelope performance

  • 0,71 W.m-2.K-1
  • Exterior lime / hemp insulation: 4 cm
    Existing solid stone: 40 cm
    Insulation hemp projected interior: 10 cm
    Finish lime / hemp or Fermacell (wet rooms)

  • 0,78
  • I4

  • 2,36


    • Individual gas boiler
    • Individual gas boiler
    • No cooling system
    • Natural ventilation
    • Humidity sensitive Air Handling Unit (Hygro B
    • No renewable energy systems

    Enveloppe performante et durable. Intervention adaptée aux maçonneries existantes. Préchauffage passif et naturel de l'air neuf.

Urban environment

  • 129,00 m2
  • 100,00 %
  • The building was built in the second half of the 18th century. This building is located at the corner of two streets, so it has a façade on the Rue de la Huchette and a façade on the Rue Xavier Privat. The building was once part of the 10th arrondissement of the Sorbonne district. At the beginning of the 19th century, the number 18 of the street of the Huchette corresponded to number 20. The change of number having been made during the second half of the 19th century. The Rue Xavier Privat also underwent a change, it was formerly that of the 3 Chandeliers located in the continuation of the street Zacharie.


    Tradical Hemp Concrete


    [email protected]


    Second œuvre / Cloisons, isolation

    Contrary to what its name suggests, hemp concrete has nothing to do with traditional concrete. Non-structural, it is an insulating and ecological filling material. Its installation on supporting framework (generally in wood) is apparent to the historical constructive principles of dense urban environments: constructions with pan of wood and pan of iron. Conjugating the qualities of hemp and lime, it is projected horizontally on a temporary or permanent formwork bottom. It ensures a distributed insulation of the construction, significantly reducing thermal bridges. The hygroscopic nature of hemp gives the walls a healthy and natural breathing, avoiding the effect "tight box". Its inert character improves the comfort of summer and winter. Finally, hemp concrete is not limiting and allows to realize all types of facade (wood cladding, zinc, plaster ...) The use of hemp concrete allows an energy sobriety, a sobriety constructive and an environmental sobriety . On this building, Tradical Hemp Concrete is used for 2 applications. In a wall with distributed insulation, it constitutes the walls of the exterior facades walls street and side courtyard. It is applied mechanically in filling between slabs. It is also used in roofing with distributed insulation.

    The sensitivity of the developer and the project management team to biosourced materials naturally led them to choose hemp concrete. The skills of the general company in this field have been a real benefit for the project.

Construction and exploitation costs

  • 180 000
  • 1 700 000

GHG emissions

  • 12,30 KgCO2/m2/an
  • RT 2005

  • 151,00 KgCO2 /m2
  • 100,00 année(s)
  • 1 381,00 KgCO2 /m2

Life Cycle Analysis

    Insulation of hemp concrete facades Wood joists Wood fiber insulation

Building candidate in the category

Bas Carbone

Bas Carbone

Coup de Cœur des Internautes

Coup de Cœur des Internautes

Green Solutions Awards 2017 - Bâtiments

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LM Ingénieur

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Green Solutions Awards 2017 - Bâtiments