The rooms of each building can be interpreted as three-dimensional cells. Borders (sides, edges) of rooms can be identified as the two-, one-, or zero-dimensional boundary cells of the three dimensional cell. The building structures identified as two-, one-, or zero-dimensional cells can be modeled by distinguished geometrical forms, surface-, line-, and point-like bodies. In accordance with the latter, building materials (finished products) can also be considered as surface-, line-, and point-like bodies.

The aim of the study is to create compliance between the cell elements and the building structures. It will be done at different levels:

– interpretation of relationship between building construction and cells, – interpretation of relationship between building construction and selected bodies, – interpretation the loadbearing's structure using cells, – structure of the surface-construction and the cells, – interpretation building types using cells. In this paper (as part I) the first two items will be studied. The other three cases will be studied in another paper (as part II).