Kjellmark is a Norwegian building contractor and Norgeshus dealer serving Røros, Holtålen, Tolga and nearby municipalities. Its services cover detached homes, cabins, architectural work, contracting, property projects, rehabilitation, alterations and extensions.

The company operates an element factory in Ålen that produces prefabricated timber components for regional construction. Projects combine local design and building delivery with Norgeshus concepts, engineering support and procurement resources.