,

Sustainable renovation of 733 housing units in Aix-en-Provence (France)

Renovation

  • Building Type : Collective housing < 50m
  • Construction Year : 1975
  • Delivery year : 2019
  • Address 1 - street : Route de Galice 13100 AIX EN PROVENCE, France
  • Climate zone : [Csa] Interior Mediterranean - Mild with dry, hot summer.

  • Net Floor Area : 56 000 m2
  • Construction/refurbishment cost : 19 130 000 €
  • Number of Dwelling : 733 Dwelling
  • Cost/m2 : 341.61 €/m2

Proposed by :

Certifications :

  • Primary energy need
    49 kWhep/m2.an
    (Calculation method : RT existant )
Energy consumption
Economical buildingBuilding
< 50A
A
51 à 90B
B
91 à 150C
C
151 à 230D
D
231 à 330E
E
331 à 450F
F
> 450G
G
Energy-intensive building

The rehabilitation operation of 10 residences belonging to Famille & Provence in the Jas de Bouffan district in Aix-en-Provence was initiated in 2011 as part of the Strategic Energy Plan of the city's social landlord.

These 733 dwellings grouped together in residences, ranging from R+4 to R+7 and built between 1974 and 1976, were in a moderately degraded state with an initial energy level of 98 kWhef/m2 SHAB per year for heating.

The operation carried out within the framework of a design-build contract integrating an energy performance commitment on the energy gains measured for heating and consumption of the common areas (ventilation and lighting) has led to an overall energy gain greater than 60% at the end of the 2 years of follow-up.

Parameters of comfort and quality of life have been favored in the overall approach of the project by developing principles of bioclimatic equity between the different dwellings (treatment of the ground floor, common floors and differentiated roofed dwellings).

In the end, the accommodations on the ground floor remain the biggest heating consumers, but they are the most comfortable in summer. The standard floors are almost passive in measured final energy, the spaces under the roof show savings of more than 75% on their heating consumption.

A very thorough follow-up of the tenants, their support and the consideration of feelings and uses, was initiated from the start of the program and densely carried out during the construction works. This monitoring has contributed to the sustainability of energy gains even during periods of confinement.

The redesigned real estate complexes, the exterior spaces reworked around an axis open to the rest of the district and conviviality gardens, contribute to a regeneration of the perceptions of the inhabitants and the residents vis-à-vis this large-scale district at the entrance of town.

Building users opinion

Strong overall appreciation confirmed by survey

If you had to do it again?

Less intrusive metrology for residents

See more details about this project

 https://www.construction21.org/france/articles/h/green-solutions-renovation-durable-de-733-logements-a-aix-en-provence-un-projet-d-equite-bioclimatique.html

Photo credit

Véronique Paul for BBSE

Contractor

Construction Manager

    BALDASSARI SIBOURG ARCHITECTES

Stakeholders

    Assistance to the Contracting Authority

    DOMENE scop

    equipe[a]domenescop.fr

     http://www.domenescop.fr

    Programming studies, assistance with competitive dialogue, monitoring of studies, construction, verification of the energy performance commitment, monitoring of comfort and consumption, BDM support


    Thermal consultancy agency

    TPFi

    Regulatory and dynamic thermal study, TCE studies, energy evaluation on metrology


    Company

    BOUYGUES BATIMENT SUD EST

    T. Mais

    Metrology and management of the energy performance commitment


    Others

    ROBERT CELAIRE CONSULTANT

    Architectural audit, global energy

Contracting method

Other methods

Type of market

Not applicable

Allocation of works contracts

Build and sell construction

Energy consumption

  • 49,00 kWhep/m2.an
  • 80,00 kWhep/m2.an
  • RT existant

    RT: 50% heating - 25% DHW - 15% lighting - 7.5% ventilation - 2.5% auxiliaries Actual: initial heating 99 kWh/m2 - After work: 33.5 kWh/m2 on average The majority of dwellings are located on the intermediate floors and have an average real consumption of less than 15kWh/m2

  • 154,00 kWhep/m2.an

Real final energy consumption

    41,00 kWhef/m2.an

    62,00 kWhef/m2.an

    2 019

Envelope performance

  • 0,62 W.m-2.K-1
  • ITE 16 cm EPS under coating
    insulation for flat roofs 12 cm PUR + parts under roof tiles 24 cm LM blown
    Low floor insulation on VS: 12 cm rock wool flocking
    Uw 2.1 double glazing PVC joinery already in place

    I4

  • 1,33

More information

Monitoring of actual consumption before and after works with instrumentation of a panel of 54 dwellings over 4 heating seasons and compilation on 10 other dwellings of consumption on invoice before/after works

Systems

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

Biodiversity approach

    • The parking lots and all the hydraulic facilities have been redesigned by a landscaper, keeping cars at a distance, freeing up quality spaces for common facilities (sports, shared gardens, public paths, etc.).
    • Dewatering of more than 10% of free spaces.
    • Creation of retention valleys for 122 m3. Planting of more than 300 new trees and conservation of existing ones.

Urban environment

    A large complex at the entrance to the town of Aix-en-Provence, the Jas de Bouffan residences have a compact geometry bordered by large open spaces. The neighborhood had to remain permeable and a connection with the BRT and the neighborhood's commercial center was reinforced around a green space under a pergola.

Product

    Socio-energetic study

    CPIE Pays d'Aix

     https://cpie-paysdaix.com/

    Management / Stakeholders involvement

    For this renovation, the CPIE Pays d'Aix carried out a socio-energy study of a certain number of families living in the residence, in order to find out their problems, both in terms of housing and their difficulties in assuming energy costs. .

    This made it possible to define a mode of operation for the Design and Implementation operation and to identify the findings and difficulties.

    Ultimately, the study allowed the project to answer these questions of energy poverty without putting aside the subject of summer comfort.


    Organization of friendly awareness-raising events

    Management / Stakeholders involvement

    Upstream, during and at the end of the project, activities were organized (thermal walks, discussion days, games, etc.) in order to raise tenants' awareness of the importance of the overall renovation project and the eco-gestures allowing to sustain the reduction in energy consumption. The inclusion of cooperatives and associations facilitated this awareness.

Construction and exploitation costs

  • 19 130 000

Social economy

    26,800 hours of integration in support of the local platform

    inclusion and associative development project: sports, shared gardens, crèche

    very in-depth socio-energetic monitoring

    festive and convivial activities (thermal walks, days of exchanges and games, etc.)

    cooperatives among project stakeholders

Reasons for participating in the competition(s)

Nous souhaitons valoriser cette opération pour partager le retour d'expérience de l'ensemble de l'opération et notamment le suivi des consommations, des conforts thermiques, y compris en période caniculaire et les volets socio-énergétiques du projet.

Building candidate in the category

Users’ Choice

Users’ Choice

Green Solutions Awards 2022-2023
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 building renovation energy housing health and comfort renewable energies BDM social housing summer comfort

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Author of the page

Gabrielle Raynal

Gérante - Directrice des études


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