Byggefirmaet Mastrup delivers new houses and summer houses together with extensions, renovation, conversions, roofing, windows, doors and insurance-repair work. The company can act as total contractor, coordinating planning and multiple building trades for private and public clients across Zealand and nearby islands.

Its type-house service covers permanent residential projects developed around customer requirements. The business is primarily a general carpenter and building contractor, not a manufacturer of standard volumetric modules or mobile homes.