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

Funding Monitoring Thermal Insulation Air Tightness Heating and Hot Water Ventilation

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


Source: http://www.powerhouseeurope.eu/nc/cases_resources/case_studies/single_view/?tx_phecasestudies_pi3%5Bid%5D=172&cHash=