Sustainable renovation of 733 housing units in Aix-en-Provence (France)
Last modified by the author on 11/03/2022 - 11:09
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
-
Primary energy need
49 kWhep/m2.an
(Calculation method : RT existant )
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.htmlPhoto credit
Véronique Paul for BBSE
Contractor
Construction Manager
Stakeholders
Assistance to the Contracting Authority
DOMENE scop
equipe[a]domenescop.fr
http://www.domenescop.frProgramming 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
- 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
- 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
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
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.