How does an Interior designer relate with an architect in terms of design and planning?

Interior designer must begin his work with the architect since the beginning of the project as a teamwork .

Where an advisory opinion in the beginning of the project through the spaces and distribution of furniture units.

Even evolve to intervene in the design work after the construction of the basic structure.through concept design to ceiling , walls, and floor....... designs.

It must be the spirit of this cooperation through the establishment of terms since the beginning until the interference does not occur during stages of work