Monday, 18 May 2026
PORR has acquired a 51 percent stake in Vienna-based drywall and interior fit-out specialist rhtb:, expanding its capabilities in interior construction and prefabricated building solutions.
Headquartered in Vienna, with additional offices in Bad Vöslau and Berlin, rhtb: provides drywall systems, integrated heating and cooling ceilings, raised access floors and partition wall solutions.
According to PORR, the acquisition strengthens its position in interior construction, particularly in areas linked to energy-efficient buildings and prefabricated construction methods. The company said rhtb’s expertise in heating and cooling ceiling systems and raised floors would support both new developments and renovation projects.
PORR also plans to integrate rhtb’s products and systems into its residential concept under the PORR Living brand, which focuses on prefabricated and cost-efficient housing solutions. The company stated that its current residential projects target construction costs below EUR 2,000 per sqm. A pilot development comprising 50 apartments in Lower Austria is already under construction.
The companies have previously collaborated on several projects, including renovation works at PORR’s headquarters in Vienna and other office fit-outs. rhtb’s portfolio also includes projects at the Austria Center Vienna and the Vienna University of Economics and Business.
rhtb: was founded 27 years ago by entrepreneur Rainer Haubenwaller, who will remain involved as shareholder and co-owner following the transaction. The company’s workforce of around 100 employees will also remain in place.
PORR said the acquisition forms part of its broader strategy to expand specialised construction services and increase the use of prefabricated building methods across residential and industrial projects.
