Grundsteinhaus GmbH plans and builds solid residential houses in Otterberg with a focus on masonry and kit-house construction. The company supports detached homes, family houses and individually adapted floor plans through design coordination, building-shell services, structural planning and construction management.

Its work centers on durable materials, clear technical execution and practical residential building solutions. Founded in 2018, its projects can include architectural planning, energy specifications, shell construction, finishing coordination and technical building services.