Computer aided design method and system for modular layouts

A method for generating, by means of a computer, at least a solution for positioning in a room a set of household elements chosen from a collection of catalogs comprising at least one catalog, said method comprising at least a first computer-implemented room spatial analysis step of automatically identifying first volumes available for automatically positioning said household elements, a second computer-implemented step of automatically generating at least one positioning solution by identifying from the collection of catalogs household elements compatible with the identified first volumes which satisfy a set of computer-generated predetermined selection positioning constraints comprising at least one constraint, and a third step for the positioning of at least a part of the identified household elements resulting from the second step in at least a part of the first volumes according to a set of positioning rules comprising at least one rule, wherein said first step comprises at least a first sub-step for automatically detecting second volumes unavailable for positioning any household element, a second sub-step for calculating volumes available for positioning said household elements and a third sub-step for searching for a set of configurations of available sub-volumes comprising at least one available sub-volume.