Very early in the design process, think in three dimensions. For example, placing the toilet next to the vanity may work fine in plan, but how will it look vertically? We experience space in multiple dimensions, so we must design for all perspectives.
After you have developed one or more visual diagrams that appear to work in plan, develop some three-dimensional sketches. Elevation sketches of a wall, to scale, are useful to evaluate spatial relationships of fixtures, cabinetry, and structural features. Design templates of elevation views can speed the process. You may wish to make notes on your elevations, as you did on the room outlines.
Many computer programs used in design drawing will generate perspective views. This technology is an excellent way to view your design from different angles and evaluate its effectiveness. Keep in mind, however, that these perspectives are interpretive—they give you a sense of the space but do not show all details.
After reviewing your visual diagrams, in plan and vertical views, select the best design layout. Review your design program to determine that the layout meets the goals and objectives. Verify that the design layout is appropriate to the structural and mechanical parameters of the project. For a renovation project, refer back to your onsite measurements of the existing space for verification. If you are working on new construction, consult project documents.
Now you are ready to detail your design solution in a complete dimensioned drawing.