XL Alu Nyílászárógyártó és Szerelőipari Kft (producer and assembler of doors and windows) was founded in 2000 in the town of Veszprém. The main activity is the production of custom-designed non-series doors and windows, curtain walls and entrance portals from aluminium and steel profile and the installation of these. Besides XL ALU assembles steel structures, first of all hall structures and also performs tinworks on buildings. The company works mainly for general contractors charged with the construction of public buildings, but also works with sub-contractors for the production of doors and windows.