The distinction is fundamentally a matter of intention or motive.
Building aims solely at utility in a narrow practical sense.
Architecture aims to meet the total needs of human, spiritual, aesthetic, intellectual as well as practical. Architecture is therefore the tangible and enduring expression and record of a culture or civilization, in all its aspects. It is to be used unlike painting and sculpture. Architecture while it is the ART of building, is not a pure art. Architecture uses not only materials like wood, stone, steel and glass, but it also employs time and light as well to create space, both interior and exterior.