Case Study: nZEC - Energy refurbishment of 41 dwellings in the residence Le Bois in Hérouville Saint Clair, France
Name of organisation: Groupe SNI - Plaine Normande
Stage of development: completed
Year of finalization: 2010
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: 41
Tenure: social rental
Street: Quartier Dubois
Postcode: 14200
City: Hérouville Saint Clair
Region/ County: Lower Normandy
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
Certification
On a scale from A to G, the level of the building after refurbishment is C (the previous level was G), with an annual consumption of 121kWh(primary energy)/m²
A: <50, B: 51< <90, C: 91< <151, D: 151< < 230, E: 231< <330, F: 331< <451, G: >451
Certificate Qualitel Habitat&Environnement by Cerqual. This certificate is related to the compliance with some commitments:
- Energy performances
- Water and Electricity savings
- Environmental management of the project
- Cleaned building site
- Choice of materials
Funding
The funding plan of this project involves ERDF funds (7%), regional funds (15%) but also specific loans (14%).
Costs | |
Statutory approvals | The costs dedicated to the preparation of the files for the obtaining of the statutory approvals are included in the costs of the pre-project studied (see below). |
Design |
Preliminary energy audit : 3 140 € without taxes
Pre-project studies (description of the building and the elements of the refurbishment programme, proposal of solution, designing layouts, projected budget…): 10 300 € without taxes
Project studies (more precise designing layouts, projected budget…) : 7 875 € without taxes
Global costs of the prime contracting: 57 090 € without taxes
|
Construction overall |
|
Prelims | Scheduling, Leading and coordinating building teams : 4 500 € without taxes |
Building services | Frontage lot: 376 422 € without taxes External door and window lot: 137 470 € without taxes Internal door and window lot: 125 043 € without taxes Metal work lot: 36 276 € without taxes Plumbing and ventilation lot: 317 428 € without taxes Ventilation cost (per dwelling): 415 € without taxes Solar installation (per dwelling): 7 317 € without taxes Electricity lot: 104 219 € without taxes Masonry lot: 22 590 € without taxes Internal painting lot: 38 172 € without taxes Tiling lot: 18 679€ without taxes |
Low/zero carbon technologies | Solar installation (per dwelling): 7 317€ without taxes |
Other | Anything not already covered in the above categories, specified if possible. |
Consequential costs | Modifications were decided on during the construction phase. Amendment 1: Global cost = 69437 € without taxes Amendment 2: Global cost = -6840 € without taxes Amendment 3: Global cost = 15040 € without taxes |
VAT | 5.5% |
Thermal Insulation
In terms of thermal insulation of the buildings, the replacement of the windows by double-glazed windows, as well as the external insulation with 11cm of polystyrene enabled to eliminate thermal bridges and improve the outer shell of the building.
Solar Thermal
Solar panels were installed for the heating of domestic hot water.
Water Saving
Concerning water savings, equipment enabling water savings were set up in the dwellings (less consuming flushes, equipment for taps).
Project Management
It is important to stress that a preliminary energy audit was carried out and the prime contracting performed a diagnosis and wrote the tendering package.
Main Results
The level of energy consumption and the CO2 emissions of the building before refurbishment was:
- Energy: 454 kWh/m²/year (level G)
- CO2 emissions: 27 kgCO2/m²/year (level D)
The level of energy consumption and the CO2 emissions of the building after refurbishment is:
- 121 kWh/m²/year (level C)
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
