Case Study: nZEC - Energy refurbishment of 25 dwellings in the residence Maréchal Leclerc, Bourgoin Jallieu, France
Name of organisation: Opac 38
Stage of development: completed
Year of finalization: 2011
Type of project: refurbishment
Area: urban
Scale: individual buildings
Type of building: Apartment in a block of five or less stories
Number of units/dwellings: 25
Tenure: social rental
Street: Avenue Professeur Tixier, 30
Postcode: 38300
City: Bourgoin Jallieu
Region/ County: Rhône-Alpes
Country: France
Last Update: 14.04.2015
Short Description
The aim of this refurbishment project was to improve the energy performance of the building but also to improve the living environment of the tenants, and to decrease the heating bill for the tenants. Different sources of founding were solicited to assemble this project: ERDF funds, fundings from the Région, specific loans.
Key Elements
Thermal Insulation
In terms of thermal insulation of the buildings, various measures were taken to eliminate thermal bridges and improve the outer shell of the building. The replacement of the simple glazing windows by triple glazing windows with argon gas and low uValue and the external insulation (with 18 to 20cm of polystyrene for the floors and 15 to 17cm of glass wool for the ground floor) of the building were among these measures. Initially, the building was not insulated. Moreover, a special focus was set on the continuity of the thermal insulation at the level of the parapets on the roof.
Funding
Costs | |
Statutory approvals | Rent-charge : 5 008€ taxes included |
Design |
Global costs of the prime contracting: 340 364€ taxes included
|
Building services | External window lot: 442 021€ taxes included Internal door and window lot: 49 227€ taxes included Metal work lot: 161 431€ taxes included Plumbing, ventilation, electricity, solar panels and gas heating lot: 358 017€ taxes included Outside spaces lot: 27 783€ taxes included Demolition lot: 7 155€ taxes included Roofing, watertightness lot: 93 932€ taxes included External insulation lot: 235 979€ taxes included Shell lot: 171 118€ taxes included Inside finishing work lot: 65 777€ taxes included |
Other | Anything not already covered in the above categories, specified if possible. |
Consequential costs | Inside finishing work lot: 65 777€ without taxes |
VAT | 5.5% |
Monitoring equipment | Specific monitoring equipment: 13 467€ all taxes included |
Running costs | General expenses (electricity for common parts, household rubbish tax…): 11 571€ all taxes included |
Operation, inspection and service | Costs for the various contracts (intercom system, pipework…) : 1199€ all taxes included |
Maintenance – repairs and replacement | Maintenance and cleaning of common parts: 10 405€ all taxes included |
Energy tariff | 2012 Heating: 7590€ for energy and 1084€ for maintenance Domestic Hot Water: 3032€ and 1740€ for maintenance |
Public financial assistance (loan/annuity/grant) | ERDF (3,8%), Regional fundings (regional projects “Réhabilitation thermique très performante” and “Bâtiment démonstrateur à basse consommation”) (10%) |
Work with Residents
A public meeting was organized during the phase of conception of the project. This meeting enabled the inhabitants to become aware of environmental stakes and to approve the project. During the retrofitting works, a show dwelling was set up and could be visited by the inhabitants. Besides, a user booklet was distributed to the inhabitants and to the building managers to clarify the technical specificities of the building. Lastly, inhabitants committee were set up to help the tenants to understand the working of the building but also to make social, technical and energy assessments at regular intervals.
Ventilation
Initially, the ventilation was ensured through the opening of windows. A new ventilation system with heat recovery (yield close to 85%) was installed. The lead and extraction ducts were set up within the external insulation to limit disturbances in the dwellings.
Main Results
The level of energy consumption and the CO2 emissions of the building before refurbishment was:
- Energy: 321 kWh/m²/year (level E)
- CO2 emissions: 75 kgCO2/m²/year (level F)
The calculated level of energy consumption and the CO2 emissions of the building after refurbishment is:
- Energy: 72 kWh/m²/year (level B)
- CO2 emissions: 17 kgCO2/m²/year (level C)
In terms of performances, this project aimed at decreasing the energy consumptions and CO2 emissions, and thus decreasing the expenses for the inhabitants. Indeed, the couple rent + expenses was carefully followed to limit the percentage of household income dedicated to this couple to 25%.
Lessons learned
Additional Information
Ms Carine Puyol
USH - The French Federation of Social Housing Providers
E-mail: carine.puyol@union-habitat.org
Web: www.union-habitat.org
