The Bachelor of Architecture (B.Arch.) is an undergraduate

Bachelor's degree

A bachelor's degree is usually an academic degree awarded for an undergraduate course or major that generally lasts for three or four years, but can range anywhere from two to six years depending on the region of the world...

 academic degree designed to satisfy the academic component of professional accreditation bodies, to be followed by a period of practical training prior to professional examination and registration. It is awarded for a course of study that lasts up to five years. In some cases, a B.Arch can only be undertaken after having completed a three-year generalist architectural degree, in which case, it may be as short as two years.