41.001Level 541.00Construction of residential and non-residential buildings41.00101Realisation of the main structure of individual houses41.00102Construction of individual ""turnkey"" houses41.00103Realisation of the main structure of multi-cellular buildings (apartments, etc.)41.00104Realisation of ""turnkey"" apartments41.00105Realisation of the structural work of buildings41.00106General coordination on the construction site