Case Study: nZEC - New construction of 9 dwellings in Walgaustrasse, Weiler, Austria (UNDER MONITORING)
Name of organisation: VOGEWOSI - Vorarlberger Gemeinnützige Wohnungsbau - und Siedlungsgesellschaft m.b.H.
Stage of development: completed
Year of finalization: 2009
Type of project: construction
Area: suburban
Scale: individual buildings
Type of building: Apartment in a block of five or less stories
Number of units/dwellings: 9
Tenure: social rental
Street: Walgaustrasse, 37A
Postcode: 6833
City: Weiler
Region/ County: Vorarlberg
Country: Austria
Last Update: 15.04.2015
Short Description
The building is a small passive house which is typical for the region and the requirement for the standards for social housing.
The promotion scheme for social housing in Vorarlberg from 2007 made the passive house standard mandatory. Later this obligation has been abrogated later.
The building is barrier free; basic building material is wood. The ration surface/volume is 0,47.
Key Elements
Funding
Financial mix of own funds, bank loans (mortgages) and soft loan extended by provincial promotion scheme.
Costs | ||
TOTAL | Per m2 | |
Construction overall | € 1.338.000 | € 1.929 |
VAT | No VAT included since VAT on construction costs is deductible in Austria as there is VAT on rent | |
Running costs | 2012 | |
Space heating + hot water | € 5.450 | |
Ventilation + pumps | € 640 | |
Operation, inspection and service | € 2.030 | |
Maintenance – repairs and replacement | € 800 | |
Thermal Insulation
According to passive house standard (24 – 30cm thermal insulation).
Air Tightness
Blower Door Test according to Passivhaus requirements.
Ventilation
Automatic ventilation with heat recovery via heat exchanger.
Heating and Hot Water
Central heating system with gas boiler integrated by solar energy (32m2 solar panels installed).
Monitoring
Click here to access the monitoring data on the HIVE Database!
Main Results
The project proves that passive houses have less energy demand on one hand but higher costs of construction on the other. One has to be aware that in small buildings the passive house standard has higher requirements since the ration of surface and volume is less efficient which is a disadvantage vis a vis bigger buildings.
Lessons learned
Additional Information
Ms Eva Bauer
Gbv - The Austrian Federation of Limited Profit Housing Associations
E-mail: ebauer@gbv.at
Web: www.gbv.at
