Its current seating capacity is 31,895. The stadium's previous capacity was 18,200, but was recently expanded to over 30,000 so that it was able to accommodate the 2008 European Football Championships.
The "EM Stadion Wals-Siezenheim" was the only stadium in the Austrian Bundesliga which uses artificial turf. Polytan's FIFA 2-Star Recommended 40mm surface Ligaturf with a 25mm elastic layer was installed in 2005. Since Summer 2010 natural Lawn is used.