Byggmestrene Magnussen og Gundersen is a Norwegian Norgeshus-affiliated builder serving Moss, Sarpsborg, Fredrikstad. It delivers detached timber-frame homes and cabins from Norgeshus catalogue concepts, with layouts and specifications adapted to project requirements.

The local company manages planning, site coordination, construction and completion, supported by Norgeshus design, engineering and procurement support. Its services also cover extensions, renovation and related timber construction work in its regional market.