Abstract: Improvements to systems for building structures of reinforced concrete or other materials using high precision modular, integral coffering of the type of systems that use standardized panels preparing integral cofferings in which the reinforcements and various installations are placed, building the coffering on a foundation slab with the help of a layout template, in which the foundation slab is built using a mould based on modular pieces whose faces form a straight dihedral and squares for the corners the pieces of which are fixed with centering clips with angular reinforcements to fix stabilizers and anchorings, these pieces to having lugs for centering the layout template. Wall templates are also used to lay out the partitions and walls, with all their installations, and new means and panels for specific building solutions.