Innovative renovation of a 1960s office in Weiz, Austria
The headquarters of the District Authority of Weiz is located in an office building constructed in 1964. Due to new requirements concerning function, fire protection and energy demand, comprehensive renovation was necessary.
Before procurement took place a comprehensive study of the building was conducted to develop a detailed and ambitious energy concept, with the target of achieving the A+ Austrian energy certificate. This provided the basis for the whole procurement process. This showed that the high energy consumption for heating was mainly caused by the poor thermal quality of the building shell (u-values) and inefficient HVAC (heating, ventilation and air conditioning) systems.
Procurement was carried out in two stages. The first step was the procurement of planning and design services (architect, specialist consultants). The restricted procedure was used, where selected architects and specialist consultants had to show their experience in the field of energy efficient renovation through reference projects – a requirement of critical success to the project.
The second step involved tedering for construction work and building services (HVAC, electrical services, etc.). As required by Austrian procurement law, this was done through an open procurement procedure. At this stage the architect and the specialist consultants employed in the first step were responsible for the technical (environmental) specification s o f the tendering documents and also for the checking the compliance of the bids. They developed detailed technical specifications for the construction work (materials, u-values, specifications for an innovative facade solution, etc.) and the building services (e.g. output power and performance of the HVAC system). For the innovative façade element tender a detailed, technologically neutral specification was developed (u-value, fire protection requirements, etc.). This was developed with a specific technology in mind (GAP Solution Façade), but it was left up to bidders to offer the most appropriate solution.
Following renovation, completed in 2011, the building is expected to have a reduction of the energy demand for heating and annual CO2-eq. emissions per m2 of about 80%. Detailed energy monitoring is being carried out to evaluate the renovation measures.
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